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Low-temperature toughness S355G10+M wide and heavy steel plate for oceanographic engineering and production method of low-temperature toughness S355G10+M wide and heavy steel plate

A technology of S355G10 and low-temperature toughness, which is applied in the field of metallurgy, can solve the problems of complex production process and high production cost, and achieve the effect of low process cost, low raw material cost and excellent welding performance

Inactive Publication Date: 2018-05-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN 104726769A discloses S355G10+N steel plate for large-thickness offshore platform and its production method. Fiery heat treatment, complex production process, high production cost

Method used

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  • Low-temperature toughness S355G10+M wide and heavy steel plate for oceanographic engineering and production method of low-temperature toughness S355G10+M wide and heavy steel plate
  • Low-temperature toughness S355G10+M wide and heavy steel plate for oceanographic engineering and production method of low-temperature toughness S355G10+M wide and heavy steel plate

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Experimental program
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Effect test

Embodiment 1

[0027] The thickness of this S355G10+M steel plate is 80 mm, and the following composition ratio and production method are adopted. Ingredient content (wt) is:

[0028] C 0.048%, Mn 1.47%, P 0.011%, S 0.001%, Si 0.23%, Alt 0.03%, Nb 0.022%, V 0.003%, Ti 0.014%, Ni 0.44%, Cr 0.13%, Cu 0.01%, Mo 0.004%, N 0.0033%, CEV 0.362%, Pcm 0.16%, Pb 0.001%, Sb 0.001%, Sn 0.001%, As 0.004%, B 0.0004%, and the rest are Fe and impurities.

[0029] The production method of this steel plate is as follows:

[0030] (1) Steelmaking process: S≤0.005% after molten iron pretreatment, P≤0.010% after deep converter desulfurization, S≤0.002% after LF deep desulfurization, ultra-low As, Sb, Sn, Pb, Bi, B residual element control , The smelting uses molten iron with qualified composition as the raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements. After the end of RH, the temperature of the molten steel is 1548°C. When reaching the con...

Embodiment 2

[0036] The thickness of the S355G10+M steel plate is 100mm, and the following composition ratio and production method are adopted. Ingredient content is (wt):

[0037] C 0.06%, Mn 1.50%, P 0.013%, S 0.001%, Si 0.24%, Alt 0.035%, Nb 0.023%, V 0.003%, Ti 0.016%, Ni 0.47%, Cr 0.13%, Cu 0.01%, Mo 0.004%, N 0.0033%, CEV 0.36%, Pcm 0.15%, Pb 0.001%, Sb 0.001%, Sn 0.002%, As 0.004%, B 0.0004%, and the rest are Fe and impurities.

[0038] The production method of this steel plate is as follows:

[0039] (1) Steelmaking process: S≤0.005% after molten iron pretreatment, P≤0.010% after deep converter desulfurization, S≤0.002% after LF deep desulfurization, ultra-low As, Sb, Sn, Pb, Bi, B residual element control , The smelting uses molten iron with qualified composition as the raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements. After the end of RH, the temperature of the molten steel is 1543°C. When reaching the conti...

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Abstract

The invention discloses a low-temperature toughness S355G10+M wide and heavy steel plate for oceanographic engineering. By adopting a compound addition component design of low-carbon, Nb, Ti, Ni and Cr and avoiding addition of V alloy, the cost of raw materials is low; by using a 320mm large section continuous casting billet, under the condition of low compression ratio, a roughing large reductiontechnology is sufficiently exerted, and rolling passes and the rolling reduction rate are reasonably assigned; an S355G10+M product with excellent low-temperature toughness is produced by using a TMCP process technology, and the rolled steel plate does not need subsequent heat treatment such as normalizing, so that the cost of the procedures is low.

Description

technical field [0001] The invention relates to a production process of a steel plate in the field of metallurgy, in particular to a low-temperature toughness S355G10+M wide-thick steel plate for marine engineering and a production process thereof. Background technique [0002] Steel for marine engineering is suitable for various complex working conditions and harsh natural environments, and its service period is 50% longer than that of steel for ordinary ships. Therefore, steel for marine engineering is required not only to have high strength and high plasticity, but also to have good welding performance and seawater resistance. Corrosion performance, should also have good toughness, to ensure that steel and equipment can adapt to various loads and low temperature environments. [0003] S355G10 series steel belongs to the European Union EN10225 standard structural steel, which stipulates the chemical composition, mechanical properties and welding performance of offshore s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C38/08C22C38/16C22C38/58C22C38/48C22C38/46C22C38/50C22C38/44C22C38/42C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D2211/009C21D2211/002C21D2211/005C21D8/02C21D8/0205C22C38/00
Inventor 潘中德武会宾吴俊平霍松波姜金星于新攀高德平张动曹余良
Owner NANJING IRON & STEEL CO LTD
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