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Manufacturing process of ultra-low carbon X42 steel grade high frequency straight welding tube

A technology of longitudinal welded pipe and manufacturing process, applied in the field of HFW high frequency longitudinal welded pipe manufacturing process

Active Publication Date: 2012-08-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the performance and production process of X42 steel grade high-frequency longitudinal seam welded pipe with an ultra-low carbon content of about 0.05%, there is still a blank in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical composition mass percentage of ultra-low carbon X42 steel grade high-frequency welded pipe material:

[0022] C: 0.0479%; Si: 0.224%; Mn: 1.1%; P: 0.0084%; S: 0.0007%; Ti: 0.015%; Cu: 0.008%; Cr: 0.019%; Mo: 0.04%; B: 0.0003%; Ca: 0.0017%;

[0023] After the steel coil is uncoiled, the head and tail of the raw steel coil need to be cut off to form a cut that is flat and 3°C in the transverse direction of the steel coil, and the tail and tail of the previous coil are welded together by MIG welding with carbon dioxide gas shielding. The coil head of the next coil is welded.

[0024] High-frequency straight seam welded pipes are produced with steel strips: the edge milling method is used to precisely control the width of the strip steel and the verticality of the edge of the plate; the width after milling is 1126mm. Roller forming method is used to form strip steel into barren tube; adjust the output power of high-frequency induction coil to 605KW; The pres...

Embodiment 2

[0031] The chemical composition mass percentage of ultra-low carbon X42 steel grade high-frequency welded pipe material:

[0032] C: 0.0386%; Si: 0.212%; Mn: 1.095%; P: 0.0069%; S: 0.0006%; Ti: 0.016%; Cu: 0.007%; Cr: 0.016%; Mo: 0.04%; B: 0.0002%; Ca: 0.0022%;

[0033] After the steel coil is uncoiled, the head and tail of the raw steel coil need to be cut off to form a cut that is flat and 3°C in the transverse direction of the steel coil, and the tail and tail of the previous coil are welded together by MIG welding with carbon dioxide gas shielding. The coil head of the next coil is welded.

[0034] Production of high-frequency straight seam welded pipes with steel strips: the edge milling method is used to precisely control the width of the strip steel and the verticality of the edge of the plate; the width after milling is 1115mm. Roller forming method is used to form strip steel into waste pipe; adjust the output power of high-frequency induction coil to 800KW; control...

Embodiment 3

[0040] The chemical composition mass percentage of ultra-low carbon X42 steel grade high-frequency welded pipe material:

[0041] C: 0.0437%; Si: 0.206%; Mn: 1.077%; P: 0.0090%; S: 0.0016%; Ti: 0.015%; Cu: 0.007%; Cr: 0.018%; Mo: 0.04%; B: 0.0002%; Ca: 0.0026%;

[0042] After the steel coil is uncoiled, the head and tail of the raw steel coil need to be cut off to form a cut that is flat and 3°C in the transverse direction of the steel coil, and the tail and tail of the previous coil are welded together by MIG welding with carbon dioxide gas shielding. The coil head of the next coil is welded.

[0043]Production of high-frequency straight seam welded pipes with steel strips: the edge milling method is used to precisely control the width of the strip steel and the verticality of the edge of the plate; the width after milling is 1286mm. Roller forming method is used to form strip steel into barren tube; adjust the output power of high-frequency induction coil to 630KW; The pr...

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Abstract

The invention provides a manufacturing process of an ultra-low carbon X42 steel grade high frequency straight welding tube, which adopts the steps of welding a reel tail of a front reel and a reel head of a back reel of the ultra-low carbon X42 steel grade high frequency straight welding tube with C content of 0.33-0.06% through steel by adopting consumable electrode gas protection protected by carbon dioxide gas; adopting a cage forming method to enable welded strip steel to be formed into a pierced billet; adjusting output power of a radio-frequency induction coil; extruding the pierced billet with the extrusion quantity of 1-4.5% * D, wherein the D is the external diameter of an end product tube, and the angular aperture theta is controlled between 3 degrees and 6 degrees; welding to be the high frequency straight weld tube with the welding speed of 14-20m / min; conducting normalizing heat treatment on welding joints with the normalizing heat treatment temperature of 950+-20 DEG C, slowly cooling the welding joints to 400 DEG C in air after normalizing, and enabling the welding joint temperature to drop to the temperature below 80 DEG C after water cooling. The performance of the welding tube achieves the levels that the tensile strength of the welding joints is no less than 415 MPa, unit value of charpy ballistic work of the welding joints is no less than 40J, and mean value of the welding joints is no less than 40J.

Description

technical field [0001] The invention relates to the field of manufacturing technology of HFW high-frequency straight seam welded pipes, in particular to a manufacturing technology for line pipes for oil and natural gas transmission. Background technique [0002] In the production and transportation of oil and gas in the world, high-frequency straight seam induction welding (HFW) high-frequency straight seam welded pipes have been widely used due to their advantages such as low manufacturing cost, high dimensional accuracy, and easy control of length. The transportation of oil, natural gas and ore slurry on the seabed has broad application prospects. [0003] At present, there are hundreds of HFW high-frequency straight seam welded pipe units in my country, but most manufacturers can only rely on large steel mills to provide coil raw materials, mainly producing conventional steel grade steel pipes with a carbon content of not less than 0.1%. There is no domestic manufacturer...

Claims

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Application Information

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IPC IPC(8): B23P17/00
Inventor 谷中莹吴文辉崔俊
Owner BAOSHAN IRON & STEEL CO LTD
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