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Production method of eh500 grade 150-200mm extra thick steel plate

A technology of extra-thick steel plate and production method, which is applied in the field of marine engineering steel, can solve the problems that the core performance is difficult to meet the classification society certification specifications, affect the low-temperature impact toughness of the steel plate, limit the thickness of the finished steel plate, etc., and achieve grain refinement Remarkable effect, improved welding performance, and reduced alloy cost

Active Publication Date: 2021-07-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the different cooling rates in the thickness direction, there are great differences in the structure, and the performance of the core is difficult to meet the classification society certification specifications, resulting in unqualified products
The deformation is uneven during the rolling process, and it is difficult to eliminate various defects caused by the billet, which seriously affects the low-temperature impact toughness of the steel plate, especially the low-temperature toughness of the core
[0004] In order to ensure the low temperature toughness of the core, the conventional process requires the thickness of the billet to be more than 3 times the thickness of the finished steel plate. The thickness of the continuous casting billet limits the thickness of the finished steel plate, and it is difficult to reach more than 150mm

Method used

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  • Production method of eh500 grade 150-200mm extra thick steel plate
  • Production method of eh500 grade 150-200mm extra thick steel plate
  • Production method of eh500 grade 150-200mm extra thick steel plate

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Embodiment Construction

[0029] A production method of EH500 grade 150-200mm extra-thick steel plate, its chemical composition and mass percentage are as follows: C: 0.05%-0.09%, Si: 0.20%-0.50%, Mn: 1.40%-1.70%, P≤0.015% , S≤0.005%, Nb: 0.030%~0.080%, V: 0.001%~0.050%, Al: 0.01%~0.05%, Ti: 0.005%~0.020%, Mo: 0.05%~0.15%, Cr: 0.15% ~0.35%, Cu: 0.10%~0.50%, Ni: 0.01%~0.80%, Cr+Ni+Mo+Cu≤1.50%, the balance is Fe and unavoidable impurities;

[0030]The 320mm thick continuous casting slab is heated at 1160-1200°C, and rolled in one stage. Before the last rolling pass, it is cooled by laminar flow, and then rolled to the thickness of the finished product; after reddening, the surface temperature is 760-800°C When controlling accelerated cooling, the cooling temperature should be below 370°C, and finally air-cooled to room temperature. Rolling is carried out in the recrystallization zone, and the reduction rate of each pass is > 10%; before the last rolling pass, the intermediate billet is cooled by laminar...

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Abstract

The invention discloses a production method of EH500 grade 150-200mm extra-thick steel plate, which relates to the technical field of marine engineering steel, and its chemical composition and mass percentage are as follows: C: 0.05%-0.09%, Si: 0.20%-0.50%, Mn: 1.40%~1.70%, P≤0.015%, S≤0.005%, Nb: 0.030%~0.080%, V: 0.001%~0.050%, Al: 0.01%~0.05%, Ti: 0.005%~0.020%, Mo: 0.00%~0.08%, Cr: 0.15%~0.35%, Cu: 0.10%~0.50%, Ni: 0.01%~0.80%, Cr+Ni+Mo+Cu≤1.50%, the balance is Fe and unavoidable of impurities.

Description

technical field [0001] The invention relates to the technical field of steel for marine engineering, in particular to a production method of EH500 grade 150-200mm extra-thick steel plate. Background technique [0002] With the gradual implementation of the national marine economic strategy, the steel used in marine engineering is developing in the direction of ultra-high strength and extra-thickness, and higher and higher requirements are put forward for the performance and quality of extra-thick steel plates. [0003] The greater the thickness of the extra-thick steel plate, the more severe the adverse effect on the performance caused by the segregation of the central composition of the slab. Due to the different cooling rates in the thickness direction, there are great differences in the structure, and the performance of the core is difficult to meet the certification specifications of the classification society, resulting in unqualified products. The deformation is uneve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 邱保文赵晋斌车马俊张晓雪李恒坤伯飞虎
Owner NANJING IRON & STEEL CO LTD