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Thick-specification high-toughness X80 pipe fitting steel plate and manufacturing method

A manufacturing method and high-toughness technology, which is applied in the field of thick-gauge high-toughness X80 pipe fitting steel plate and its manufacturing field, can solve the problems that it is difficult to guarantee the low-temperature toughness and strength of the pipe fitting steel plate, and it is difficult to guarantee the welding performance and low-temperature toughness of the steel plate.

Inactive Publication Date: 2016-11-23
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For 1) in the announced product composition design, there is no addition of Cu element, no requirements for the key indicators of welding sensitivity index Pcm and Ceq, but only involves the production of 16-25mm pipe fitting steel X65 steel, it is difficult to guarantee the welding performance and low temperature of the steel plate Toughness performance; 2) 3) 4) 5) mainly involves the composition design of X70, X80, X90, and X100 pipe fitting steels. It mainly involves the composition design, rolling process, coiling process and post-heat treatment process of pipe fitting steel plates, but does not specifically involve the smelting process of high toughness pipe fitting steel and the process of systematically releasing internal stress of steel plates to improve low temperature toughness of pipe fitting steel plates

Method used

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  • Thick-specification high-toughness X80 pipe fitting steel plate and manufacturing method
  • Thick-specification high-toughness X80 pipe fitting steel plate and manufacturing method
  • Thick-specification high-toughness X80 pipe fitting steel plate and manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment １

[0032] The thick-gauge high-toughness X80 pipe fitting steel plate in this example is prepared from the following components by mass percentage: C: 0.08%, Si: 0.30%, Mn: 1.85%, P: 0.0064%, S: 0.0016%, Cr : 0.25%, Ni: 0.30%, Nb: 0.070%, Mo: 0.25%, Ti: 0.013%, V: 0.05%, Cu: 0.20%, Pcm=0.23%, Ceq=0.53%, the balance is Fe and unavoidable of impurities.

[0033] The production preparation method of the thick gauge high toughness X80 pipe fitting steel plate of the present embodiment is as follows:

[0034] 1) BOF process: Smelting scrap steel such as high-quality slab edges and billets. After the TSC measurement, quickly pull the gun down to the carbon gun position to ensure that the low gun position time is 1 minute; the tapping time is 6 minutes, and the tapping hole is free Flow, the end temperature of the converter is controlled at = 1660 ° C, the alloy addition sequence: aluminum block - Almanganese ferromanganese - metal manganese - ferrosilicon - ferrochromium - ferroniobiu...

Embodiment 2

[0044] The thick-gauge high-toughness X80 pipe fitting steel plate in this example is prepared from the following components by mass percentage: C: 0.05%, Si: 0.2%, Mn: 1.65%, P: 0.0084%, S: 0.003%, Cr : 0.15%, Ni: 0.15%, Nb: 0.025%, Mo: 0.18%, Ti: 0.013%, V: 0.02%, Cu: 0.10%, Pcm=0.17%, Ceq=0.41%, the balance is Fe and unavoidable of impurities.

[0045] The production preparation method of the thick gauge high toughness X80 pipe fitting steel plate of the present embodiment is as follows:

[0046] 1) BOF process: Smelting scrap steel such as high-quality slab edges and billets. After the TSC measurement is completed, quickly pull the gun down to the carbon gun position to ensure that the low gun position time is 2 minutes; the tapping time is 6 minutes, and the tapping hole is not loose Flow, the end temperature of the converter is controlled at = 1700 ℃, the alloy addition sequence: aluminum block - aluminum manganese ferro - manganese metal - ferrosilicon - ferrochromium ...

Embodiment 3

[0055] The thick-gauge high-toughness X80 pipe fitting steel plate in this example is prepared from the following components by mass percentage: C: 0.065%, Si: 0.25%, Mn: 1.75%, P: 0.0054%, S: 0.002%, Cr : 0.15%, Ni: 0.26%, Nb: 0.060%, Mo: 0.20%, Ti: 0.013%, V: 0.04%, Cu: 0.15%, Pcm=0.20%, Ceq=0.46%, the balance is Fe and unavoidable of impurities.

[0056] The production preparation method of the thick gauge high toughness X80 pipe fitting steel plate of the present embodiment is as follows:

[0057] 1) BOF process: use high-quality slab edge, waste billet and other scrap steel for smelting, after the TSC measurement, quickly pull the gun down to the carbon gun position, and ensure that the time for the low gun position is 1.5 minutes; the tapping time is 6 minutes, and the tapping hole is free Diffuse flow, the temperature at the end of the converter is controlled at = 1675°C, the order of alloy addition: Aluminum block - Almanganese ferromanganese - metal manganese - ferro...

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Abstract

The invention discloses a thick-specification high-toughness X80 pipe fitting steel plate and a manufacturing method. Low-carbon Nb+Mo+V+Ni+Ti multielement microalloy unique component design is adopted, it is ensured that after heat treatment, thick-specification X80 pipe fitting steel has the excellent strength rich amount and high-toughness performance, a high-clean steel and defect-free continuous casting slab gradual model flexible light reduction technology is utilized, occluded foreign substances in the steel are improved, the level of various kinds of occluded foreign substances in the steel is smaller than or equal to 1.5, crack defects of steel blanks and even steel plates are removed, and by means of the TMCP rolling and whole system destressing technology, the toughness performance of the thick-specification X80 pipe fitting steel plate is improved, and the steel plate shape is improved; by means of the high-temperature tempering heat treatment technology, heat diffusion treatment is achieved, internal stress is released, and the organization structure and toughness of a center line area of the steel plate are improved. The problems that after the heat treatment, the X80 pipe fitting steel plate is low in strength rich amount, poor in toughness plasticity, poor in welding performance, poor in whole plate performance uniformity, poor in plate shape and the like are solved.

Description

technical field [0001] The invention relates to the technical field of low-alloy high-strength pipeline steel manufacturing, in particular to a thick-gauge high-toughness X80 pipe fitting steel plate and a manufacturing method. Background technique [0002] With the rapid development of oil and gas transmission pipelines at home and abroad, a large number of compressor stations, transmission and distribution stations, valve chambers, pipe caps and tee fittings of equal and different diameters need to be built during the pipeline laying process. The pipeline fittings in the pipeline can change the direction of the pipeline according to the needs; secondly, they can buffer the tensile and compressive stress and torque added to the straight pipe by the stratum migration, earthquake and external environment changes in the area where the pipeline is located. Important components with relatively harsh loads. Due to the complex stress state of pipe fitting steel in use, and the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/16C22C38/14C22C38/12C22C38/08C22C38/04C22C38/02C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 牛延龙刘晓东刘志刚韩启彪陈晔于爽赵慧杰蒋学庆苏秀梅
Owner SHANDONG IRON & STEEL CO LTD
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