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Production method of X80 pipeline steel wide and thick plate

A production method and technology for wide and thick plates, applied in the production field of X80 pipeline steel wide and thick plates, can solve problems such as increasing the difficulty of plate shape control, and achieve the effects of improving low-temperature drop hammer crack arrest performance, uniform performance, and easy plate shape control.

Active Publication Date: 2018-08-14
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-caliber high-grade X80 pipeline steel, due to the wide width of the steel plate, it will increase the difficulty of controlling the shape of the steel plate during rolling

Method used

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  • Production method of X80 pipeline steel wide and thick plate
  • Production method of X80 pipeline steel wide and thick plate
  • Production method of X80 pipeline steel wide and thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The production method of X80 pipeline steel wide and thick plate, the thickness of the steel plate is 30.8mm, and the width of the steel plate is 4350mm.

[0021] The mass percentage of chemical composition of steel is: C=0.04%, Si=0.07%, Mn=1.73%, P=0.009%, S=0.0012%, Als=0.039%, Nb=0.062%, Ti=0.016%, Cr= 0.18%, Mo=0.17%, Ni=0.19%, Cu=0.13%, B=0.0003%, Ca=0.0012%, Pcm=0.16%, the balance is Fe and unavoidable impurities;

[0022] The key process steps and parameters are:

[0023] (1) Smelting: Converter tapping temperature 1623°C, end point [C]=0.045%, end point [O]=680ppm; after tapping, argon blowing and strong stirring, stirring time 31min, molten steel temperature after stirring 1557°C, [C]= 0.025%; then enter the LF furnace for heating and refining, deoxidation and alloying, and then enter the RH furnace for vacuum treatment; 200m of pure Ca line is fed out of LF, and 150m of pure Ca line is fed out of RH; [Si]=0.04% after LF furnace .

[0024] (2)...

Embodiment 2

[0029] Embodiment 2: The production method of X80 pipeline steel wide and thick plate, the thickness of the steel plate is 25.7mm, and the width of the steel plate is 4365mm.

[0030] The mass percentage of chemical composition of steel is: C=0.04%, Si=0.06%, Mn=1.71%, P=0.008%, S=0.0010%, Als=0.032%, Nb=0.055%, Ti=0.018%, Cr= 0.25%, Mo=0.11%, Ni=0.25%, Cu=0.13%, B=0.0002%, Ca=0.0015%, Pcm=0.16%, the balance is Fe and unavoidable impurities;

[0031] The key process steps and parameters are:

[0032] (1) Smelting: Converter tapping temperature 1632°C, end point [C]=0.05%, end point [O]=651ppm; after tapping, argon blowing and strong stirring, stirring time 39min, molten steel temperature after stirring 1545°C, [C]= 0.02%; then enter the LF furnace for heating and refining, deoxidation and alloying, and then enter the RH furnace for vacuum treatment; 200m of pure Ca line is fed out of the LF station, and 150m of pure Ca line is fed out of the RH station; [Si]=0.04% after the L...

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Abstract

Disclosed is a production method of an X80 pipeline steel wide and thick plate. The thickness of the steel plate is larger than or equal to 19 mm, and the width of the steel plate is larger than or equal to 3800 mm. Steel comprises the chemical compositions of, by mass, 0.04-0.05% of C, no more than 0.10% of Si, 1.20-1.80% of Mn, no more than 0.015% of P, no more than 0.002% of S, 0.02-0.06% of Als, 0.02-0.08% of Nb, 0.010-0.025% of Ti, no more than 0.3% of Cr, no more than 0.3% of Mo, no more than 0.3% of Ni, no more than 0.3% of Cu, no more than 0.0005% of B, 0.001-0.002% of Ca, no less than0.3% of Cr+Mo, no more than 1.0% of Cu / Ni, no more than 0.20% of Pcm, and the balance Fe and inevitable impurities. The transverse and longitudinal microstructures of the steel plate are uniform, thetransverse and longitudinal full-thickness DWTT shearing areas at the temperature of minus 30 DEG C are all larger than or equal to 85%. The low-temperature drop weight crack arrest performance of the large-wall-thickness large-diameter high-steel-grade pipeline steel can be improved, and meanwhile the plate shape is easy to control during rolling.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel production, and in particular relates to a production method of X80 pipeline steel wide and thick plates. Background technique [0002] Improving the transmission pressure and increasing the diameter of the pipeline are the basic ways to reduce the operating cost of oil and gas pipeline transportation. The development and safe operation of high-grade, large-wall-thickness, and large-diameter pipeline steel have become important for the construction of long-distance pipeline projects in the world. need. However, for large wall thickness and high grade X80 pipeline steel, the effect of plate thickness size effect on DWTT is very significant. According to the API Spec 5L standard, when the thickness of the steel plate is 19.0~22.2mm, the thickness is reduced to 19.0mm, and the DWTT test temperature is lowered by 6°C; when the thickness of the steel plate is 22.2~28.6mm, the thickness is redu...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/44C22C38/42C22C38/54C22C38/58C21D8/02
CPCC21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 罗登彭宁琦蒋凌枫刘理史术华熊祥江周文浩李中平陈奇明解保清
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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