S460G2+M steel plate for seaborne weldable structure and production method thereof

A steel plate production method and welding structure technology, applied in the field of metallurgy, can solve the problems of production process cost, high alloy cost, complex production process, high production cost, etc., meet the requirements of large market demand, excellent welding performance, and ensure heating uniformity Effect

Active Publication Date: 2018-08-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention includes quenching + tempering heat treatment process, adding Mo, V and other alloys in the composition design, high production process cost, high alloy cost, and long delivery cycle
[0006] The existing S460G2 grade steel plates for weldable structures in the sea are normally produced by quenching + tempering heat treatment process, and precious alloys such as Nb, V, Mo, Ni, etc. are added in combination, the production process is complicated, the production cost is high, and the delivery cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This example provides a S460G2+M steel plate for offshore weldable structures, the thickness of the steel plate is 80mm, and its chemical composition and mass percentage are as follows: C: 0.064%, Mn: 1.54%, P: 0.012%, S: 0.001%, Si: 0.27%, Alt: 0.028%, Nb: 0.038%, V: 0.002%, Ti: 0.013%, Ni: 0.52%, Cr: 0.23%, Cu: 0.02%, Mo: 0.003%, CEV: 0.40%, Pcm: 0.17%, the rest is Fe and impurities.

[0023] The production method is as follows:

[0024] Steelmaking process: adopt hot metal pretreatment desulfurization technology, converter deep dephosphorization technology, LF deep desulfurization technology; adopt dynamic soft reduction, electromagnetic stirring technology, use 320mm large cross-section continuous casting billet, and adopt continuous casting billet C type segregation precise control Technology, C1.0 grade of continuous casting slab center segregation;

[0025] Heating process: the billet is added to the heating furnace for heating, the heating coefficient is 10.5m...

Embodiment 2

[0030] This embodiment provides a S460G2+M steel plate for offshore weldable structures, the thickness of the steel plate is 100mm, and its chemical composition and mass percentage are as follows:

[0031] C: 0.069%, Mn: 1.55%, P: 0.010%, S: 0.001%, Si: 0.25%, Alt: 0.029%, Nb: 0.035%, V: 0.002%, Ti: 0.016%, Ni: 0.54%, Cr: 0.21%, Cu: 0.01%, Mo: 0.004%, CEV: 0.41%, Pcm: 0.18%, and the rest are Fe and impurities.

[0032] The production method is as follows:

[0033] Steelmaking process: adopt hot metal pretreatment desulfurization technology, converter deep dephosphorization technology, LF deep desulfurization technology; adopt dynamic soft reduction, electromagnetic stirring technology, use 320mm large cross-section continuous casting billet, and adopt continuous casting billet C type segregation precise control Technology, C0.5 level of central segregation of continuous casting slab;

[0034] Heating process: the billet is heated in the heating furnace, the heating coefficie...

Embodiment 3

[0039] This embodiment provides a S460G2+M steel plate for offshore weldable structures, the thickness of the steel plate is 100mm, and its chemical composition and mass percentage are as follows:

[0040]C: 0.053%, Mn: 1.56%, P: 0.010%, S: 0.001%, Si: 0.20%, Alt: 0.032%, Nb: 0.029%, V: 0.004%, Ti: 0.011%, Ni: 0.46%, Cr: 0.22%, Cu: 0.02%, Mo: 0.001%, CEV: 0.39%, Pcm: 0.16%, and the rest are Fe and impurities.

[0041] The production method is as follows:

[0042] Steelmaking process: adopt hot metal pretreatment desulfurization technology, converter deep dephosphorization technology, LF deep desulfurization technology; adopt dynamic soft reduction, electromagnetic stirring technology, adopt 320mm large cross-section continuous casting billet, and adopt continuous casting billet C type segregation precise control Technology, continuous casting slab center segregation C 0.5 level;

[0043] Heating process: the billet is heated in a heating furnace, the heating coefficient is 1...

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Abstract

The invention discloses an S460G2+M steel plate for a seaborne weldable structure and a production method thereof and relates to the field of metallurgy. The production method comprises the followingsteps: carrying out steelmaking: utilizing a large-section continuous casting blank and adopting a continuous casting blank type C segregation accurate control technology to segregate the center of the continuous casting blank for C0.5 and C1.0 grades; heating: adding the casting blank into a heating furnace and heating, wherein the heating coefficient is greater than or equal to 10.0min/cm and the heating temperature is 1180 to 1220 DEG C; rolling: under a low compression ratio, adopting a two-stage controlled rolling technology, wherein the temperature of first-stage rolling is 980 to 1150 DEG C, the final two-path reduction rate of rough rolling is greater than or equal to 20 percent and the initial rolling temperature of the second stage is less than or equal to 820 DEG C; cooling: putting a rolled steel plate into an ultra-rapid cooling system and rapidly cooling, wherein the re-reddening temperature is 550 to 590 DEG C; then carrying out stacking and slow cooling, wherein the stacking time is 72h or more. The steel plate developed by the invention reach performance requirements of EN10225 standards, and economical and batch production of the steel plate can be realized; utilization requirements under seaborne various working conditions and bad natural environments are met.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a S460G2+M steel plate for offshore weldable structures and a production method thereof. Background technique [0002] Offshore structures need to withstand harsh environments such as sea typhoon, severe cold and freezing, high salt spray, etc. Therefore, steel plates for offshore structures are required to not only have high strength, high plasticity, good welding performance and seawater erosion resistance, but also have excellent overall thickness Directional low-temperature toughness, that is, steel plates with excellent comprehensive properties such as low-temperature service, strain resistance, easy welding, and corrosion resistance are required to ensure that steel and equipment can adapt to various loads and low-temperature environments, and meet various complex working conditions and harsh natural environments at sea Use the following requirements. [0003] S460G2 is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/46C22C38/50C22C38/44C22C38/42C22C38/06C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/021C21D8/0263C21D9/46
Inventor 潘中德吴俊平霍松波姜金星高德平靳星吴伟勤
Owner NANJING IRON & STEEL CO LTD
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