The invention relates to a piercing mandrel (1) for the production of seamless tubes having a piercing mandrel base body (4) and a piercing mandrel lug (5). In order to increase the service life of the piercing mandrel, it is proposed that the piercing mandrel lug (5) is releasably connected to the piercing mandrel base body (4) and the piercing mandrel lug (5) is connected to the piercing mandrel base body (4) via a snap ring securing system (8) or that the piercing mandrel lug (5) consists of a material based upon tungsten carbide.
B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
2.
ASSEMBLY FOR INSTALLING AN ABOVE-SURFACE STRUCTURE IN WATER-COVERED GROUND, IN PARTICULAR FOR THE MONOPILE-INSTALLATION OF AN OFFSHORE WIND TURBINE, AND METHOD FOR MOUNTING SAME
The invention relates to an assembly (1) for installing an above-surface structure (8) in water-covered ground, in particular for the monopile-installation of an offshore wind turbine, having at least one coupling structure (3) resting on a ground (4) which can be anchored to the ground (4) via at least one foundation element (5) and to which a supporting structure (2) can be secured for supporting the above-surface structure (8). In order to achieve a high level of environmental compatibility for the foundation structure (1) during installation as well as to achieve simple and cost-effective installation, it is proposed that the at least one coupling structure (3) is arranged within the supporting structure (2), within a lower end (2a) of the supporting structure (2). The invention also relates to alternative methods for mounting this installing assembly (1) on ground (4).
A non-destructive method for determination of twist angle of an outlet product during rolling of an inlet product into said outlet product, comprising the steps of measuring a rotational inlet speed of the inlet product during said rolling, measuring a rotational outlet speed of the corresponding outlet product during said rolling in order to determine a delta rotation, measuring a longitudinal speed and determining a twist angle from said delta rotation and said longitudinal outlet and/or inlet speed.
B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
4.
Pile installation system for an offshore foundation construction and method of installing a pile
This pile installation system for an offshore foundation construction includes a main body, a movable part and a first means for attaching the main body to a frame of reference. This frame of reference is configured to act as a counterweight. It further includes a second means for attaching the movable part to a pile to be installed, and the movable part may be moved, with respect to the main body, in translation about the direction of an insertion axis.
A device for levelling an offshore foundation construction including a cylinder equipped with a fastening member for removably fastening the cylinder to a part of the offshore foundation construction, a rod mobile in axial translation with respect to the cylinder, the rod including a pushing end so configured to push against a mudmat.
E02B 17/02 - Artificial islands mounted on piles or like supports, e.g. platforms on raisable legsConstruction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
7.
METHOD AND APPARATUS FOR DETERMINATION OF TWIST ANGLE DURING A ROLLING OPERATION
A non-destructive method for determination of twist angle of an outlet product during rolling of an inlet product into said outlet product, comprising the steps of measuring a rotational inlet speed of the inlet product during said rolling, measuring a rotational outlet speed of the corresponding outlet product during said rolling in order to determine a delta rotation, measuring a longitudinal speed and determining a twist angle from said delta rotation and said longitudinal outlet and/or inlet speed.
Pile installation system for an offshore foundation construction and method of installing a pile This pile installation system (26) for an offshore foundation construction includes a main body (28), a movable part and a first means for attaching the main body (28) to a frame of reference. This frame of reference is configured to act as a counterweight. It further includes a second means for attaching the movable part to a pile (22) to be installed, and the movable part may be moved, with respect to the main body (28), in translation about the direction (formula (I)) of an insertion axis.
This device (24) for levelling an offshore foundation construction (2) includes a cylinder (25) equipped with a fastening means for removably fastening the cylinder (25) to a part of the offshore foundation construction (2), a rod (56) mobile in axial translation with respect to the cylinder (25), the rod (56) including a pushing end so configured to push against a mudmat (14).
This device (26) for verifying the bearing capacity of a first pile (22a) of an offshore foundation construction comprises a body (28), a first means for connecting the body (28) to a referential element, a second means for connecting the body (28) to the first pile (22a), a means for applying (34) a load on the first pile (22a) i n a direction parallel to the axis of the first pile (22a). It further includes a means for measuring a displacement of the first pile (22a).
The invention deals with Steel for seamless pipes comprising the following chemical composition elements in weight percent: 0.04≤C≤ to 0.18, 0.10≤Si≤0.60, 0.80≤Mn≤1.90, P≤0.020, S≤0.01, 0.01≤Al≤0.06, 0.50≤Cu≤1.20, 0.10≤Cr≤0.60, 0.60≤Ni≤1.20, 0.25≤Mo≤0.60, B≤0.005, V≤0.060, Ti≤0.050, 0.010≤Nb≤0.050, 0.10≤W≤0.50, N≤0.012, where the balance is Fe and inevitable impurities. The steel of the invention can be used in offshore applications, line process pipes, structural and mechanical applications, especially where harsh environmental conditions and service temperatures down to −80° C. occur.
C21D 7/13 - Modifying the physical properties of iron or steel by deformation by hot working
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
C22C 38/26 - Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C22C 38/40 - Ferrous alloys, e.g. steel alloys containing chromium with nickel
C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
C22C 38/26 - Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C22C 38/40 - Ferrous alloys, e.g. steel alloys containing chromium with nickel
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
14.
HIGH CHROMIUM MARTENSITIC HEAT-RESISTANT STEEL WITH COMBINED HIGH CREEP RUPTURE STRENGTH AND OXIDATION RESISTANCE
Martensitic heat-resistant steel for boiler applications with a unique combination of enhanced creep strength and excellent oxidation resistance upon high temperature exposure in steam containing environments., having the following melt analysis (in wt.-%): C: 0.10 to 0.16%, Si: 0.20 to 0.60%, Mn: 0.30 to 0.80%, P ≤0.020%, S ≤0.010%, Al ≤0.020%, Cr: 10.5 to 12.00%, Mo: 0.10 to 0.60%, V: 0.15 to 0.30%, Ni: 0.10 to 0.40%, B: 0.008 to 0.015%, N :0.002 to 0.020%, Co: 1.50 to 3.00%, W: 1.50 to 2.50%, Nb: 0.02 to 0.07%, Ti: 0.001-0.020%. The balance of the steel consists of iron and unavoidable impurities. The steel is normalized for a period of about 10 to about 120 minutes in the temperature range between 1050 °C and 1170°C and cooled down in air or water to room temperature, and then tempered for at least one hour in the temperature range between 750°C and 820°C. It exhibits martensitic microstructure with average δ-ferrite content of less than 5 vol.-%.
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
The invention deals with Steel for seamless pipes comprising the following chemical composition elements in weight percent: 0.04 ≤ C ≤ to 0.18, 0.10 ≤ Si ≤ 0.60, 0.80 ≤ Mn ≤ 1.90, P ≤ 0.020, S ≤ 0.01, 0.01 ≤ Al ≤ 0.06, 0.50 ≤ Cu ≤ 1.20, 0.10 ≤ Cr ≤ 0.60, 0.60 ≤ Ni ≤ 1.20, 0.25 ≤ Mo ≤ 0.60, B ≤ 0.005, V ≤ 0.060, Ti ≤ 0.050, 0.010 ≤ Nb ≤ 0.050, 0.10 ≤ W ≤ 0.50, N ≤ 0.012, where the balance is Fe and inevitable impurities. The steel of the invention can be used in offshore applications, line process pipes, structural and mechanical applications, especially where harsh environmental conditions and service temperatures down to -80°C occur.
C21D 7/13 - Modifying the physical properties of iron or steel by deformation by hot working
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 1/18 - HardeningQuenching with or without subsequent tempering
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
16.
METHOD FOR PRODUCING AN ELONGATED HOLLOW BODY CONSISTING OF STEEL AND HAVING A POLYGONAL, IN PARTICULAR SQUARE OR RECTANGULAR, CROSS-SECTION
The invention relates to a method for producing an elongate hollow body consisting of steel and having a polygonal cross-section, comprising the following steps: producing an intermediate hollow body having a round cross-sectionfrom a flat pre-materialor from a block-shaped pre-material,whereby the intermediate hollow body is cooled or quenched with partial or full phase transformation,testing the intermediate hollow body in a non- destructive manner, final-shaping without intended reduction of the wall thickness of the intermediate hollow body to form a final hollow body having a polygonal, in particular square or rectangular, cross-section, final-heat treating the intermediate hollow body immediately prior to the final-shaping or final-heat treatment and final-shaping the intermediate hollow body in a common step. This method can be used to produce hollow bodies having increased dimensional stability, in particular narrow dimension tolerances. The hollow bodies are heat-treated and tested in a non-destructive manner.
B21C 37/00 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape
B21B 17/14 - Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
G01N 23/00 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or
17.
METHOD FOR ULTRASONIC TESTING OF ELONGATE HOLLOW PROFILES
The invention relates to a method for ultrasonic testing of angled hollow profiles (5) consisting of sound-conducting material, in particular consisting of metal, comprising an ultrasonic testing device (11), consisting of a probe (1) having transducers (A to G), which are arranged on a transducer ruler (4), in a phased-array technique, wherein ultrasonic signals (10) for detecting external and internal defects on the hollow profile (5) are generated by the transducers (A to G) and are coupled into the surface of the hollow profile (5). In order to implement testing of the test body outer and inner surface for defects, in particular longitudinal defects, including the radius regions, which testing has a greater level of quality assurance and can be automated in a cost-effective manner, it is proposed that for the purpose of detecting external and internal defects in a surface region (5.6) and in radius regions (5.5) of the hollow profile (5), the transducers (A to G) are adjusted in dependence upon their position with respect to the surface region (5.6) and their position with respect to the radius regions (5.5) of the hollow profile (5) such that ultrasonic signals (10) are generated having intromission angles adapted to the external and internal defects in the surface region (5.6) and in the radius regions (5.5) and that prior to the actual ultrasonic testing of the hollow profile (5), ultrasonic testing is performed on a reference profile (5').
G01N 29/22 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic wavesVisualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object Details
G01N 29/26 - Arrangements for orientation or scanning
G01N 29/28 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic wavesVisualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object Details providing acoustic coupling
G01N 29/30 - Arrangements for calibrating or comparing, e.g. with standard objects
18.
Method for producing hot-rolled seamless pipes having thickened ends
A method for producing hot-rolled, seamless pipes having at least one wall thickening which can be arranged at any positions over the length of the pipe, wherein by means of a multiple-stand mandrel bar rolling mill, the rolls roll a hollow shell on a mandrel bar as an inner tool to a required nominal wall thickness and produce at specified positions over the length of the pipe a required wall thickening on the outer side of the pipe by opening the rolls in the rolling stands. The thickened wall is produced and finish-rolled by two rolling stands that are consecutive as seen in the rolling direction, in which the deviations of the finished contour of the thickening from an ideal circular cross-section are minimised, wherein the rolling stands located upstream are likewise opened as to avoid any contact of the rolls of these rolling stands with the previously produced thickening.
B21B 17/04 - Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel in a continuous process
A method for producing a tempered, seamlessly hot-rolled steel pipe includes heating a hollow block to forming temperature and rolling the heated block in a rolling mill to form a pipe with a finished diameter after rolling. Subsequently, the pipe is tempered with appropriate tempering parameters after rolling whereby the diameter of the pipe increases during tempering. The finished diameter of the pipe to be tempered after rolling in the rolling mill is adjusted as a function of a value of the growth in diameter of the pipe during tempering.
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 9/14 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
C21D 1/18 - HardeningQuenching with or without subsequent tempering
A piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, having a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar. The outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal direction towards the piercing mandrel main body in order to increase the durability of the piercing mandrel when used for piercing round blocks of metal, in particular higher-alloyed steel materials which are difficult to work, by means of skew rolling providing a qualitative improvement of the inner surface of the pierced round block and reducing tool costs.
B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
21.
Rolling rod as an inner tool in the production of seamless metal hollow bodies and method for producing a metal hollow body
A rolling rod configured as an inner tool in the production of seamless hollow bodies, such as seamless pipes. The rolling rod has a nitrided surface layer and may consist of a heat-resistant steel material having a chromium equivalent calculated by a formula, as well as has a minimum hardness, yield point and tensile strength. A seamlessly hot-rolled, metallic hollow body is produced by a stretch-forming procedure in a multiple-stand rolling mill via the rolling rod which is threaded into the hollow block. Prior to threading the rolling rod into the hollow block, the rolling rod is provided with a liquid lubricant and is subsequently dried. The rolling rod is threaded in with a clearance with respect to the inner diameter of the hollow block. Prior to threading-in the rod, the hollow block may have an average temperature of at least 1000° C., with the rod having a determined speed.
B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
B21B 17/02 - Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel
The invention relates to a method for producing hot-rolled seamless pipes having at least one thickened wall portion that can be arranged at arbitrary positions across the length of the pipe, wherein by means of a multi-stand rod rolling mill having at least three roll stands and at least two rollers per stand, the rollers roll a hollow block pipe on a rolling rod as an internal tool to a required nominal wall thickness, and at pre-determined positions across the length of the pipe produce a required thickened wall portion on the outside of the pipe as compared to the nominal thickened wall portion by driving the rollers in the roll stands. In order to provide a method for producing hot-rolled seamless pipes by means of a rod rolling mill, with which at least one thickened wall portion at the pipe end or at a defined position on the pipe, of optimal roundness without the need for a subsequent compression process, can be produced, according to the invention the thickened wall is produced and roll-finished at the predetermined positions with only the two roll stands that are successive as viewed in the direction of rolling, wherein deviations of the finished contour of the thickened portion from an ideal circular cross section resulting from driving the rollers through the roller contours become minimal. The roll stands located in front thereof as viewed from the direction of rolling are likewise driven on for a required wall thickness gradation of the roll stands, and all subsequent roll stands are at least driven on such that a contact of the rollers of said roll stands with the previously produced thickened portion, and thus a subsequent reduction of the produced thickened wall portion is avoided. Fig. 2:
B21B 17/04 - Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel in a continuous process
06 - Common metals and ores; objects made of metal
07 - Machines and machine tools
37 - Construction and mining; installation and repair services
Goods & Services
Steel pipes; Pipes and tubes of metal; Alloys of common metal; Unwrought steel; Pig iron; Wrought common metals; Raw base metals; Steel alloys; Steel alloys unwrought or semi-wrought; Junctions of metal for pipes; Pipe muffs of metal; Junctions of metal for pipes including those from alloy steel and titanium; Hollow steel bars; Rolled steel; Iron castings [semi-finished]; Profiled metal sections [semi-finished]; Steel castings [semi-finished]. Tubes being fitted parts of machines; Pipes [fitted parts of machines]. Maintenance and repair of instruments; Machinery installation, maintenance and repair; Services for the repair of pipes; Pipe laying; Servicing of conduits; Maintenance and repair of pipes used in industrial equipment.
24.
METHOD FOR HOT FORGING ELONGATED ANGULAR PROFILES MADE OF METAL, IN PARTICULAR OF STEEL
During hot forging of axially symmetric profiles (1, 1a, 1b, 1c, 1d), which have an angular outer cross section with an angle of axial symmetry (W-Achs) and are made of metal, in particular steel, by means of a radial forging machine, the precursor material is regularly rotated around an angle of rotation (W-Dreh) by means of at least one manipulator. If the angle of axial symmetry (W-Achs) is greater than the machine-related maximum angle of rotation (W-max), then at least one idle stroke is configured. If the angle of axial symmetry is less than the machine-related minimum angle of rotation (W-min), then the forging material is rotated about an angle (W-Dreh) which corresponds to the ratio of the machine-related minimum angle of rotation (W-min) and the angle of axial symmetry (W-Achs) rounded to the next highest whole number.
METHOD FOR PRODUCING HOT-ROLLED SEAMLESS PIPES FROM TRANSFORMABLE STEEL, IN PARTICULAR FOR PIPELINES FOR DEEP-WATER APPLICATIONS, AND CORRESPONDING PIPES
The invention relates to a method for producing hot-rolled seamless pipes (1) from transformable steel, in particular for pipelines for deep-water applications. The pipe ends (3) are hot-upsetted in order to achieve a thickened wall portion after a final rolling process of the pipes (1). The aim of the invention is to produce pipes with excellent fatigue, corrosion, and welding properties. This is achieved in that a pre-selected ratio between a wall thickness of the pipe end (3) and a wall thickness of a wall body (2) adjoining the pipe end (3) is set by the hot-upsetting process such that a pipe (1) is achieved with a pipe end (3) which has a lower strength than the pipe body (2) after a uniform tempering process of the entire pipe (1) following the hot-upsetting process by using a previously ascertained wall thickness-dependent cooling rate during the tempering process.
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/14 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
26.
ROLLING ROD AS AN INNER TOOL IN THE PRODUCTION OF SEAMLESS METAL HOLLOW BODIES AND METHOD FOR PRODUCING A METAL HOLLOW BODY
The invention relates to a rolling rod as an inner tool in the production of seamless hollow bodies, in particular in the elongation of metal hollow blocks into seamless pipes by means of a multi-stand rolling mill, having a surface having a nitrided layer. In order to achieve an increase in the service life of the rolling rod, the rolling rod according to the invention is made of a steel resistant to high temperatures having a chromium equivalent Creq. of more than 6.5, calculated according to Creq. = % Cr + % Mo + 1.5 x % Si + 0.5 x % Nb + 2 x % Ti (1), having a minimum hardness of 200 HV 0.5, measured 0.5 mm below the surface of the rolling rod, having a yield strength of at least 450 MPa at 500 °C, and having a tensile strength of at least 600 MPa at 500 °C, and the nitrided layer has a depth of more than 0.15 mm from the surface and a nitriding hardness of more than 950 HV 0.5. The invention further relates to a method for producing a seamlessly hot-rolled metal hollow body, in particular a steel pipe, wherein a previously produced hollow block is subjected to an elongation process in a multi-stand rolling mill over a rolling rod inserted into the hollow block, which rolling rod is described above, and the rolling rod is provided with a liquid lubricant before the rolling use, i.e., before the start of the insertion into the hollow block, which liquid lubricant is subsequently dried, wherein the rolling rod is inserted with a play of at least 10 mm with respect to the inside diameter of the hollow block and the hollow block has an average temperature of at least 1000 °C immediately before the start of the insertion of the rod and the rod velocity VST during the rolling in a rod rolling mill satisfies the following conditions at most: VSTmax = 0.9 x rod length / rolling time of last stand (3), VSTmax = 0.9 x VMmin (4), wherein VMmin is the minimum velocity of the pipe material during the rolling in the rod rolling mill.
B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
27.
METHOD FOR THE HOT FORGING OF A SEAMLESS HOLLOW BODY OF MATERIAL THAT IS DIFFICULT TO FORM, IN PARTICULAR OF STEEL
The invention relates to a method for the hot forging of a seamless hollow body of material that is difficult to form. It is proposed that the hot forging is performed with a degree of forming, with respect to the cross section to be formed, in the forging section with ln(AO/A1) of less than 1.5 and a method-related form changing rate of less than 5/s, where AO is defined as the local cross-sectional area of a hollow body to be forged in m2 and A1 is defined as a local cross-sectional area of the finished hollow body in m2 and the form changing rate is defined as the maximum rate of the hollow body to be forged in m/s with respect to the outside diameter of the finished-forged hollow body in m.
The invention relates to a piercing mandrel (4) for piercing heated round blooms (3) made of metal, in order to produce seamless tubes (6), said piercing mandrel comprising a piercing mandrel nose (4.2) and a piercing mandrel main body (4.1) that can be connected to a mandrel bar (5). According to the invention, the external diameter of the piercing mandrel nose (4.2) is conically tapered in the longitudinal direction towards the piercing mandrel main body (4.1), in order to increase the service life of the piercing mandrel when cross-roll piercing round blooms made of metal, in particular made of more highly alloyed steel materials that are difficult to form, while taking into consideration a qualitative improvement of the inner surface of the pierced round blooms, and while reducing the cost of tools.
B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
29.
METHOD FOR PRODUCING A QUENCHED AND TEMPERED SEAMLESSLY HOT-FABRICATED STEEL PIPE
The invention relates to a method for producing a quenched and tempered, seamlessly hot-rolled steel pipe, according to which method a hollow block heated to forming temperature is rolled in a rolling mill into a pipe having a finished diameter after the rolling and then is quenched and tempered and the diameter of the pipe increases during the quenching and tempering with corresponding quenching and tempering parameters. In order to specify a production method for quenched and tempered seamlessly hot-fabricated steel pipes that enables more economical production of such pipes while the geometric requirements for the quenched and tempered finished pipe are satisfied, according to the invention, with knowledge of the diameter growth of the pipe during the quenching and tempering, the finished diameter of the pipe to be quenched and tempered is set after the rolling in the rolling mill.
B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of tubes or metal hosesCombined procedures for making tubes, e.g. for making multi-wall tubes
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
30.
Foundation structure of an offshore plant, in particular an offshore wind turbine, which foundation structure is to be installed at a low noise level, and installation method therefor
A foundation structure of an offshore plant, such as a wind turbine, comprising at least one foundation element that can be anchored to the seabed without a gravity foundation and without a floating foundation and a support structure fastened thereto for fixing the offshore plant. The foundation element is a pile that can be inserted into the seabed by means of drilling and/or by means of vibratory driving, can be fixed in the seabed by means of an organic and/or inorganic material, and is oriented at an angle from a vertical on the seabed. A method of installing the foundation structure on a seabed includes first anchoring the coupling element by means of piles inserted into the seabed and then connecting the support structure to the coupling element.
E02D 29/09 - Constructions or methods of constructing, in water, not otherwise provided for
31.
FOUNDATION STRUCTURE OF AN OFFSHORE PLANT, IN PARTICULAR AN OFFSHORE WIND TURBINE, WHICH FOUNDATION STRUCTURE IS TO BE INSTALLED AT A LOW NOISE LEVEL, AND INSTALLATION METHOD THEREFOR
The invention relates to a foundation structure (1) of an offshore plant, in particular an offshore wind turbine, comprising at least one foundation element that can be anchored to the seabed without a gravity foundation and without a floating foundation and a support structure (2) fastened thereto for fixing the offshore plant. According to the invention, in order to achieve a high level of environmental compatibility of the foundation structure (1) during the installation and a simple and economical installation, the foundation element is a pile (5) that can be inserted into the seabed by means of drilling and/or by means of vibratory driving, can be fixed in the seabed by means of an organic and/or inorganic material, and is oriented at an angle from a vertical on the seabed. The invention further relates to a method for installing said foundation structure (1) on a seabed (4), wherein first the coupling element (3) is anchored by means of piles (5) inserted into the seabed (4) and then the support structure (2) is connected to the coupling element (3).
The invention relates to a closure element (1) for closing the ends of pipes, in particular steel pipes, comprising a circular bottom cover (2), the outside diameter of which corresponds at most to the outside diameter of the pipe, and a side facing the pipe interior, which side has at least two elastic clamping elements (5) that are supported on the inner surface of the pipe in the installed state and thus clamp the bottom cover (2). In order to enable more universal use, the closure element has means for optionally adjusting/changing the radial position of the clamping elements (5) on the bottom cover (2).
The invention relates to a method for connecting the ends of steel tubes by means of orbital welding using a hybrid laser arc technique, with the tubes preferably having wall thicknesses ≥6 mm and more particularly ≥12 mm and diameters of preferably ≥150 mm, the ends of which tubes are connected by one or more welding passes, wherein the laser and arc welding heads as tools are guided over a guide ring fixedly arranged around a tube end in the region of the weld site during the welding and are displaced around the tube diameter. The invention also relates to a device for carrying out the method, wherein the laser and the arc welding heads are positioned separately on the guide ring and are moved over the tube circumference and controlled independently of one another during the welding process.
B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
B23K 9/028 - Seam weldingBacking meansInserts for curved planar seams
B23K 28/02 - Combined welding or cutting procedures or apparatus
B23K 26/14 - Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beamNozzles therefor
B23K 26/282 - Seam welding of curved planar seams of tube sections
The invention relates to a traction rod for bracing a crane jib, comprising a metallic tubular body and coupling elements which are connected to both ends thereof in an articulated connection of the traction rods among each other by means of bolts. According to the invention, the tubular body and the coupling elements can be detachably connected to each other, dispensing the need for a bonded connection, wherein the region of the connection is dimensioned in such a manner and is low on notch effects that, by calculation, the entire load capacity of the tube cross-section can be exploited with respect to a highest possible fatigue strength.
The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15-0.18% C; 0.20-0.40% Si; 1.40-1.60% Mn; max. 0.05% P; max. 0.01% S; >0.50-0.90% Cr; >0.50-0.80% Mo; >0.10-0.15% V; 0.60-1.00% W; 0.0130-0.0220% N; the remainder is made up of iron with production-related impurities; with the optional addition of one or more elements selected from Al, Ni, Nb, Ti, with the proviso that the relationship V/N has a value of between 4 and 12 and the Ni content of the steel is not more than 0.40%.
A steel alloy with excellent creep strength and corrosion resistance that is ferritic at usage temperatures above 620° C. has the following chemical composition (in wt. %): C≦1.0%; Si≦1.0%; Mn≦1.0%; P max. 0.05%; S max. 0.01%; 2≦Al≦12%; 3≦Cr≦16%; 2≦Ni≦10% and/or 2≦Co≦10%, where 2≦Ni+Co≦[% Cr]+2.07×[% Al]>=0.95×([% Ni]+[% Co]); N max. 0.0200%. The remainder is iron with steel production-related impurities. Optionally, one or more elements of V, Ti, Ta, Zr, Nb, Mo and W, as well as one or more elements of Hf, B, Se, Y, Te, Sb, La and Zr with a cumulative content of <0.1% can be added. The steel structure includes uniformly distributed coherent precipitates based on a chromium-stabilized (Ni, Co)Al—B2 intermetallic ordered phase.
The invention relates to a method for the production of hot-finished, particularly hot-rolled, seamless pipes having optimized fatigue properties in the welded state, having an outside diameter of up to 711 mm and a nominal wall thickness of up to 100 mm, made of metal, in particular steel. After hot or finish rolling, a defined pipe cross-section is produced on at least one pipe end across a predetermined length, having tight tolerances for inside and outside diameters, wherein the cross-section can then be welded to the pipe end of another pipe. According to the invention, in a region a wall thickness is created in a first step at the pipe end in question, the thickness being bigger than on the remaining pipe body, wherein the outside diameter is increased and/or the inside diameter is reduced. In a second step, the required pipe cross-section is produced in said region by mechanical treatment, and the transition from the treated to the untreated region of the pipe is produced with low surface roughness and almost notch-free, and the residual wall thickness remaining in the treatment region is within the required tolerances.
