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SA516Gr70 steel plate meeting high mold welding conditions and production method thereof

A production method and technology for steel plates, applied in the field of container steel under high die welding conditions, can solve problems such as unstable performance qualification rate, and achieve the effect of improving performance qualification rate, good performance, and uniform performance on the same plate

Inactive Publication Date: 2017-04-26
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Complicated performance requirements lead to unstable performance pass rate, which has always hovered around 85%, which is far from meeting the needs of contract production. It is urgent to conduct in-depth research on this type of steel, determine a clear process plan, and improve stability. Performance pass rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A SA516Gr70 steel plate under high mold welding condition and its production method are as follows.

[0018] The thickness of this steel plate is 15mm, and it is composed of the following components in weight percentage: C: 0.18%, Si: 0.23%, Mn: 1.20%, P: 0.008%, S: 0.003%, TAl: 0.042%, Nb: 0.016%, the balance is Fe and unavoidable impurities, Ceq=0.38%.

[0019] The production method of the steel plate includes a rolling process, a water cooling process and a heat treatment process; the rolling process adopts a type II controlled rolling process, and the rolling is carried out in two stages; The temperature is 700°C.

[0020] The heat treatment process: the normalizing process temperature is 905°C, the heating coefficient is 2.3min / mm, and the target reddening temperature after accelerated cooling is 770°C.

[0021] The SA516Gr70 steel plate complies with the requirements of EN 10204 3.1. The mechanical properties are: -5°C impact (adding 1 / 2 place, transverse direct...

Embodiment 2

[0024] A SA516Gr70 steel plate under high mold welding condition and its production method are as follows.

[0025] The thickness of this steel plate is 100mm, and it is composed of the following components in weight percentage: C: 0.21%, Si: 0.25%, Mn: 1.20%, P: 0.008%, S: 0.003%, TAl: 0.50%, Nb: 0.017%, the balance is Fe and unavoidable impurities, Ceq=0.41%.

[0026] The production method of the steel plate includes a rolling process, a water cooling process and a heat treatment process; the rolling process adopts a type II controlled rolling process and is rolled in two stages; The temperature is 730°C.

[0027] The heat treatment process: the normalizing process temperature is 900°C, the heating coefficient is 2.2min / mm, and the target reddening temperature after accelerated cooling is 650°C.

[0028] The SA516Gr70 steel plate complies with the requirements of EN 10204 3.1. The mechanical properties are: -5°C impact (adding 1 / 2 place, transverse direction), the average ...

Embodiment 3

[0031] A SA516Gr70 steel plate under high mold welding condition and its production method are as follows.

[0032] The thickness of this steel plate is 30mm, and it is composed of the following components in weight percentage: C: 0.19%, Si: 0.20%, Mn: 1.20%, P: 0.005%, S: 0.003%, TAl: 1.20%, Nb: 0.015%, the balance is Fe and unavoidable impurities, Ceq=0.39%.

[0033] The production method of the steel plate includes a rolling process, a water cooling process and a heat treatment process; the rolling process adopts a type II controlled rolling process, and rolling is carried out in two stages; The temperature is 670°C.

[0034] The heat treatment process: the normalizing process temperature is 890°C, the heating coefficient is 1.9min / mm, and the target reddening temperature after accelerated cooling is 550°C.

[0035] The SA516Gr70 steel plate complies with the requirements of EN 10204 3.1. The mechanical properties are: -5°C impact (adding 1 / 2 place, transverse direction),...

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Abstract

The invention discloses a SA516Gr70 steel plate meeting high mold welding conditions and a production method of the SA516Gr70 steel plate meeting the high mold welding conditions. The SA516Gr70 steel plate meeting the high mold welding conditions is composed of the following components including, by weight, 0.18%-0.21% of C, 0.20%-0.40% of Si, 1.10%-1.20% of Mn, not larger than 0.010% of P, not larger than 0.003% of S, 0.020%-1.20% of TAl, 0.015%-0.020% of Nb and the balance Fe and inevitable impurities. The production method comprises the working steps of rolling, water cooling and heat treatment. According to the working step of rolling, the II-type controlled rolling technology is adopted, and rolling is conducted through two stages. The SA516Gr70 steel plate meeting the high mold welding conditions and the production method of the SA516Gr70 steel plate meeting the high mold welding conditions aim to achieve that for different performance requirements and thickness specifications, corresponding internal control components and rolling and heat treatment technologies are determined, the performance yield of the steel plate is improved, the actual performance yield is not higher than 85% at present, and the performance yield is improved to be equal to or higher than 90% through tackling the key problem.

Description

technical field [0001] The invention belongs to the technical field of container steel under high-mode welding conditions, and in particular relates to an SA516Gr70 steel plate under high-mode welding conditions and a production method. Background technique [0002] The demand for SA516Gr70 steel plates with mold welding requirements is increasing in the market. At the same time, the requirements for the mold welding performance of container steel are becoming more and more stringent. The mold welding temperature is increased from the usual temperature range of 550℃-620℃ to 650℃ or even higher High, the maximum mold welding time has also exceeded 12 hours; in preheating, the normalizing temperature has increased to 930 ° C or even higher, and the cooling method has also changed from traditional water cooling to air cooling and then to furnace cooling. Die welding treatment; the performance requirements are increased from 1 / 4 of the plate thickness to 1 / 2 of the plate thickne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C21D8/02C21D1/28
CPCC22C38/04C21D1/28C21D8/0226C22C38/02C22C38/06C22C38/12
Inventor 马驰李志琼雷钧皓邓东升
Owner WUYANG IRON & STEEL
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