Production method of ultrahigh-strength anti-cracking thick steel plate

A technology of ultra-high strength and production method, applied in the field of metallurgy, can solve problems such as failure to prove that the steel plate has excellent crack arrest performance, lack of scientificity and rigor, etc., to increase investment and production costs, reduce production costs, and reduce alloy content. Effect

Inactive Publication Date: 2015-07-22
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses low-temperature impact toughness and NDT ductile-brittle transition temperature to measure the crack arrest performance of the steel plate, which is

Method used

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  • Production method of ultrahigh-strength anti-cracking thick steel plate
  • Production method of ultrahigh-strength anti-cracking thick steel plate

Examples

Experimental program
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Effect test

Embodiment 1

[0033]This embodiment is a production method of high-strength anti-crack thick steel plate. The chemical composition weight percentage of steel is: C=0.06%, Si=0.21%, Mn=1.62%, P=0.009%, S=0.0017%, Nb =0.039%, Ti=0.015%, Al=0.044%, Ni=0.48%, Cu=0.28%, Gr=0.18%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0034] Smelting: Converter tapping P=0.006%, C=0.0028%, LF+VD refining process is adopted, LF furnace refining is full of argon blowing, slag deoxidation, white slag retention time 21min, refining slag alkalinity CaO / SiO 2 =3.5; VD vacuum degassing treatment, the vacuum degree is below 0.5tor, the vacuum holding time is 23min, the outbound molten steel N=42ppm, H=1.5ppm, O=16ppm.

[0035] Continuous casting: full protection casting is adopted, the superheat of the tundish is 23°C, and the thickness of the slab is 301mm.

[0036] Heating: temperature 1190~1200℃, soaking time 35min.

[0037] Rolling: The final rolling temperature of the first ...

Embodiment 2

[0041] This embodiment is a production method of high-strength anti-crack thick steel plate, the chemical composition weight percentage of steel is: C=0.07%, Si=0.18%, Mn=1.60%, P=0.011%, S=0.0025%, Nb =0.035%, Ti=0.018%, Al=0.039%, Ni=0.42%, Cu=0.25%, Gr=0.16%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0042] Smelting: Converter tapping P=0.008%, C=0.0041%, LF+VD refining process is adopted, LF furnace refining is full of argon blowing, slag deoxidation, white slag retention time 22min, refining slag alkalinity CaO / SiO 2 =3.8; VD vacuum degassing treatment, the vacuum degree is below 0.5tor, the vacuum holding time is 22min, the outbound molten steel N=40ppm, H=1.5ppm, O=18ppm.

[0043] Continuous casting: full protection casting is adopted, the superheat of the tundish is 18°C, and the thickness of the slab is 300mm.

[0044] Heating: billet heating temperature 1192°C, soaking time 30min.

[0045] Rolling: Two-stage rolling is adopted, t...

example 3

[0049] This embodiment is a production method of high-strength anti-crack thick steel plate, the chemical composition weight percentage of steel is: C=0.07%, Si=0.22%, Mn=1.58%, P=0.010%, S=0.0015%, Nb =0.038%, Ti=0.017%, Al=0.038%, Ni=0.35%, Cu=0.18%, Gr=0.15%, and the rest are Fe and unavoidable impurities. Key process steps include:

[0050] Smelting: Converter tapping P=0.006%, C=0.0036%, LF+VD refining process is adopted, argon is blown throughout the LF furnace refining, slag is deoxidized, white slag retention time is 22min, and the alkalinity of refining slag is CaO / SiO 2 =3.6; VD vacuum degassing treatment, the vacuum degree is below 0.5tor, the vacuum holding time is 20min, the outbound molten steel N=38ppm, H=2ppm, O=16ppm.

[0051] Continuous casting: full protection casting is adopted, the superheat of the tundish is 21°C, and the thickness of the slab is 300mm.

[0052] Heating: billet heating temperature 1198°C, soaking time 31min.

[0053] Rolling: two-stage...

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Abstract

The invention relates to a production method of an ultrahigh-strength anti-cracking thick steel plate. The steel comprises the following chemical components in percentage by weight: at most 0.10% of C,0.10%-0.50% of Si, 1.40%-1.80% of Mn, at most 0.015% of P, at most 0.005% of S, 0.02%-0.05% of Nb, 0.008%-0.02% of Ti, 0.015%-0.05% of Al, 0.2%0-0.50% of Ni, at most 0.35% of Cu, at most 0.25% of Gr, at most 0.25% of Mo, and the balance of Fe and inevitable impurities. The production method comprises the following key steps: smelting, continuous casting, heating, rolling and cooling. By adopting the low-carbon high-manganese Nb-Ti-Ni multielement microalloying component design system in combination with LF+VD (ladle furnace+vacuum degasser) compound refining and ultra-fast cooling techniques, the ultra-thick steel plate with the yield strength of 400 MPa above and the maximum thickness of 80mm can be produced. The -40-DEG C impact toughness of the steel plate core can reach 250J above, the nil ductility transition temperature is -80 DEG C below, and the high-strength steel plate has higher toughness, weldability and cracking resistance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a production method of an ultra-high-strength anti-crack thick steel plate. technical background [0002] With the development of the economy and the increase of trade volume, container ships are gradually developing in the direction of large-scale, and the load carrying capacity of the upper deck structure of container ships is also increasing. Some key parts, such as main deck, sheer strakes, cabin Due to the requirements of high strength, high toughness and high crack arrest performance for the mouth coaming plate and other parts, the general high-strength ship plate can no longer meet the use requirements. Taking the world's largest 16,000TEU ultra-large container ship as an example, the thickness of the hatch coaming reaches 80mm, and the amount of steel used for crack arresting steel EH47 is about 2,000 tons per ship. As early as the 1990s, Japan began to develop crack-sto...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/16C22C38/14C21D8/02C21C7/10C21C7/06
Inventor 汤伟杨建华于青肖大恒艾亮李玲玲孙小平高海亮
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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