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Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof

A technology of anti-large deformation and production method, which is applied in the field of metal material rolling, can solve the problems of inability to produce hot-rolled steel plates with specifications above 22mm, narrow temperature control range of production process, and increase the difficulty of production control, and achieve excellent comprehensive mechanics. performance, improved resistance to large deformations, and the effect of reducing the critical cooling rate

Inactive Publication Date: 2011-02-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the steel plate disclosed in this patent has low yield ratio and high uniform deformation elongation, its production process temperature control range is relatively narrow (30-50°C), which increases the difficulty of production control; and its composition includes Nb, Cr, The content of Ni is high, which increases the production cost; in addition, its production method requires a large thickness of the billet. The application requires that "the cumulative deformation of rolling in the recrystallization zone is ≥ 60%" and that "rolling in the non-recrystallization zone Control the compression ratio at more than 5 times"
According to the "Supplementary technical conditions for hot-rolled steel plates for large-deformation longitudinal submerged arc welded pipes in the Second West-East Gas Pipeline Project" standard, the nominal thickness of longitudinally welded pipes is required to be 22mm / 26.4mm. When hot-rolled steel plates are used, the thickness of the continuous casting slab required is at least 275mm / 330mm. Therefore, according to the process described in this patent, the production lines of most domestic steel mills cannot produce standard LSAW pipes with specifications above 22mm. hot rolled steel plate

Method used

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  • Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof
  • Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof
  • Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The chemical composition (wt%) of the developed X80 grade anti-large deformation pipeline steel is: C accounts for 0.052, Si accounts for 0.24, Mn accounts for 1.77, Nb accounts for 0.074, Ti accounts for 0.015, Mo accounts for 0.17, Ni accounts for 0.18, Cu accounts for 0.24 , P≤50ppm, S≤50ppm.

[0030] Send the cast slabs that meet the composition requirements to a soaking furnace at 1200°C. After holding the heat for 150 minutes, descale the cast slabs by high-pressure water to remove the iron oxide scales on the cast slabs, and then enter into two-stage rolling. The first stage of rolling is rolled in the recrystallization zone, the rolling start temperature is 1100°C, and the final rolling temperature is 1050°C; after multiple passes of rolling, the continuous casting slab is rolled to 81mm, and the reduction of each pass They are 18%, 20%, 22%, 22%, 24%, respectively, and the cumulative total reduction is 70%.

[0031] The intermediate billet is warmed to 900°C b...

Embodiment 2

[0035] The chemical composition (wt%) of the developed X80 grade anti-large deformation pipeline steel is: C accounts for 0.047, Si accounts for 0.15, Mn accounts for 1.71, Nb accounts for 0.038, Ti accounts for 0.008, Mo accounts for 0.21, Ni accounts for 0.25, Cu accounts for 0.22 , P≤50ppm, S≤50ppm.

[0036] Send the cast slabs that meet the composition requirements to a soaking furnace at 1200°C. After holding the heat for 150 minutes, descale the cast slabs by high-pressure water to remove the iron oxide scales on the cast slabs, and then enter into two-stage rolling. The first stage of rolling is rolled in the recrystallization zone, the rolling start temperature is 1100°C, and the final rolling temperature is 1050°C; after multiple passes of rolling, the continuous casting slab is rolled to 81mm, and the reduction of each pass They are 18%, 20%, 22%, 22%, 24%, respectively, and the cumulative total reduction is 70%.

[0037] The intermediate billet is warmed to 900°C b...

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Abstract

The invention belongs to the field of metal material rolling, relating to a low-cost and high toughness X80 pipe steel with high deformation resistance and a manufacture method thereof. The X80 pipe steel comprises the following components: C: 0.02 to 0.08%, Si: <=0.40%, Mn: 0.2 to 2.0%, P: <=0.015%, S: <=0.004%, Nb: 0.03to 0.08%, Ti: 0.005 to 0.03%, Mo: 0.10 to 0.30%, Cu: <=0.40%, Ni: <=0.30% and the balance Fe. The manufacture method of the X80 pipe steel comprises the steps of controlling the rolling of the reheating area as well as the re-crystallization area and the no-re-crystallization area for a plate slab in two stages, and controlling the cooling process of air cooling and water cooling in two stage after the rolling to obtain the high-toughness X80 pipe steel with high deformation resistance. Due to the component design of low Mo and Nb contents, in the manufacture method, the cost is effectively reduced, the comprehensive mechanical property is improved, the control applicability of the manufacture technology is significantly enhanced, and the difficulty of the manufacture is greatly reduced.

Description

technical field [0001] The invention belongs to the field of metal material rolling, and relates to a low-cost, high-performance steel and its production process, specifically referring to X80 large-deformation-resistant pipeline steel with low cost, high toughness, high plasticity, and strong production process control applicability and its Production Process. Background technique [0002] At present, with the increase of national infrastructure investment, the pipeline field is developing rapidly. Following the second line of the West-East Gas Pipeline, the third and fourth lines of the West-East Gas Pipeline have been included in the plan. According to the plan, in 2014, the West Third Line will be fully ventilated. At that time, it will be interconnected with the main pipeline networks such as the West First Line, West Second Line, Shaanxi-Beijing First and Second Lines, and Sichuan-East Gas Transmission Line. 17 natural gas pipeline projects, including the pipeline an...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 康永林孟德亮郑晓飞孙浩安守勇夏佃秀
Owner UNIV OF SCI & TECH BEIJING
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