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S460M thick plate and low cost thermo mechanical controlled process method thereof

A low-cost, slab-casting technology, applied in the field of metallurgy, can solve problems such as poor results, achieve low alloy cost, excellent welding performance, and improve the strength of steel plates

Active Publication Date: 2018-12-14
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of S460M thick plate and its low-cost thermomechanical rolling method, to solve the problems such as poor effect existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The thickness of the S460M steel plate is 100mm, and the following composition ratio and production method are adopted. The composition content (wt) is: C0.08%, Mn 1.56%, P 0.016%, S 0.003%, Si 0.26%, Alt 0.032%, Nb 0.028 %, Ti0.012%, Cr 0.22%, CEV 0.39%, Pcm 0.18%, and the rest are Fe and impurities.

[0027] The production method of this steel plate is as follows:

[0028] (1) Steelmaking process: converter deep dephosphorization molten steel P: 0.016%, hot metal pretreatment and LF deep desulfurization molten steel S: 0.003%, continuous casting slab center segregation B 0.5 grade.

[0029] (2) Heating process: the heating process is as follows: the heating temperature is 1209° C., and the heating time is 336 minutes.

[0030] (3) Rolling process: two-stage controlled rolling process is adopted, the temperature at the end of the first stage rolling is 1012°C, and the reduction rate of the last two passes of this stage is 24% and 21%; the rolling temperature of the se...

Embodiment 2

[0034] The thickness of the S460M steel plate is 100mm, and the following composition ratio and production method are adopted. The composition content (wt) is: C0.10%, Mn 1.51%, P 0.013%, S 0.002%, Si 0.24%, Alt 0.035%, Nb 0.031 %, Ti0.015%, Cr 0.18%, CEV 0.39%, Pcm 0.19%, and the rest are Fe and impurities.

[0035] The production method of this steel plate is as follows:

[0036] (1) Steelmaking process: converter deep dephosphorization molten steel P: 0.013%, hot metal pretreatment and LF deep desulfurization molten steel S: 0.002%, continuous casting slab center segregation C1.0 grade.

[0037] (2) Heating process: the heating process is as follows: the maximum heating temperature is 1201°C, and the heating time is 388 minutes.

[0038] (3), rolling process: two-stage controlled rolling process is adopted, the temperature at the end of rolling in the first stage is 1002°C, and the reduction rate in the last two passes of this stage is 23% and 21%; the rolling start temper...

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PUM

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Abstract

The invention discloses an S460M thick plate. The S460M thick plate is prepared from the following components in percentage by mass: 0.07 to 0.11 percent of C, 1.40 to 1.60 percent of Mn, 0.10 to 0.30percent of Si, smaller than or equal to 0.020 percent of P, smaller than or equal to 0.005 percent of S, 0.020 to 0.035 percent of Nb, smaller than or equal to 0.020 percent of Ti, 0.020 to 0.050 percent of Alt, 0.15 to 0.25 percent of Cr, smaller than or equal to 0.006 percent of N, smaller than or equal to 0.40 percent of CEV, smaller than or equal to 0.20 percent of Pcm and the balance of Fe and impurities. The invention also discloses a low cost thermo mechanical controlled process method of the S460M thick plate. Compared with the prior art, the S460M thick plate adopts low carbon micro-alloying design; Ni, V and other valuable alloys are not added while lower Nb and small amount of Cr alloy elements with lower cost are added, so that the strength of a steel plate is improved, the cost of the alloy is low and the welding performance of the steel plate is more excellent.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a S460M thick plate and a low-cost thermomechanical rolling method thereof. Background technique [0002] Marine structures need to withstand the test of harsh environments such as typhoon, severe cold and high salt spray on the sea surface. Therefore, steel plates for marine structures are required not only to have high strength and high plasticity, but also to have excellent low-temperature toughness and good welding performance, etc., to ensure that the steel And equipment can adapt to various loads and low temperature environments, and meet the requirements of various complex working conditions and harsh natural environments at sea. [0003] S460M is the steel grade with the highest strength specified in the EN10025-4:2004 standard "Thermo-mechanical rolling and welding of fine-grained steel". chemical composition, mechanical properties, etc. Compared with the Q460D st...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/26C22C38/06C22C38/28C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28
Inventor 潘中德吴俊平姜金星靳星胡其龙高飞李明徐椿森
Owner NANJING IRON & STEEL CO LTD