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Quenched and tempered water power plant large-thickness low-alloy high-strength steel plate and production method thereof

A technology of high-strength steel plate and production method, applied in the field of metallurgy, can solve the problems of lack of welding performance, poor stability of low-temperature impact performance, and inability to meet the performance requirements of steel plates, and achieve the effect of shortening production cycle, easy operation, and wide range of specifications

Inactive Publication Date: 2018-12-18
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All steel plates of this level produced in China have been normalized before, but when the thickness of the steel plate reaches a certain level, the ordinary normalizing process can no longer meet the performance requirements of the steel plate
[0003] At present, the maximum thickness of extra-thick S460N-Z35 steel for hydropower in China is 200mm, and the stability of low-temperature impact performance is poor, especially it does not have good welding performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The steel grade S460N / Z35 of the large-thickness low-alloy high-strength steel plate for quenched and tempered hydropower in this embodiment, the steel plate thickness is 260mm, the chemical composition and mass percentage of the steel plate are: C: 0.19%, Si: 0.30%, Mn: 1.60%, P: 0.015%, S: 0.004%, Ni: 0.78%, Nb: 0.020%, TAl: 0.037%, and the balance is Fe and unavoidable impurities.

[0022] The production method of the quenched and tempered large-thickness low-alloy high-strength steel plate for hydropower in this embodiment includes smelting, die casting, cleaning of steel ingots, stacking and slow cooling, heating, rolling, ultrasonic flaw detection, and heat treatment. The specific process steps are as follows:

[0023] (1) Smelting process: the molten steel is smelted in an electric furnace first, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1630°C, it is transferred to the vac...

Embodiment 2

[0032] In this example, the steel grade S460N / Z35 of the large-thickness low-alloy high-strength steel plate for quenched and tempered hydropower, the thickness of the steel plate is 256 mm, the chemical composition and mass percentage of the steel plate are: C: 0.18%, Si: 0.32%, Mn: 1.70%, P: 0.012%, S: 0.004%, Ni: 0.56%, Nb: 0.045%, TAl: 0.038%, and the balance is Fe and unavoidable impurities.

[0033] The production method of the quenched and tempered large-thickness low-alloy high-strength steel plate for hydropower in this embodiment includes smelting, die casting, cleaning of steel ingots, stacking and slow cooling, heating, rolling, ultrasonic flaw detection, and heat treatment. The specific process steps are as follows:

[0034] (1) Smelting process: the molten steel is first smelted in an electric furnace, then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1620°C, it is transferred to the v...

Embodiment 3

[0043] The steel grade S460N / Z35 of the large-thickness low-alloy high-strength steel plate for quenched and tempered hydropower in this embodiment, the steel plate thickness is 255mm, the chemical composition and mass percentage of the steel plate are: C: 0.16%, Si: 0.37%, Mn: 1.50%, P: 0.013%, S: 0.002%, Ni: 0.40%, Nb: 0.027%, TAl: 0.021%, and the balance is Fe and unavoidable impurities.

[0044] The production method of the quenched and tempered large-thickness low-alloy high-strength steel plate for hydropower in this embodiment includes smelting, die casting, cleaning of steel ingots, stacking and slow cooling, heating, rolling, ultrasonic flaw detection, and heat treatment. The specific process steps are as follows:

[0045] (1) Smelting process: the molten steel is smelted in an electric furnace first, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1630°C, it is transferred to the vac...

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Abstract

A quenched and tempered water power plant large-thickness low-alloy high-strength steel plate and a production method thereof are disclosed. The chemical components of the steel plate are as follows in mass percent: C: 0.16 to 0.19%, Si: 0.27 to 0.37 %, Mn: 1.50 to 1.70 %, P <= 0.015 %, S <= 0.005 %, Ni: 0.40 to 0.80 %, Nb: 0.020 to 0.050 %, TAl: 0.020 to 0.050 %, and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting, mold casting, ingot cleaning and stacking slow cooling, heating, rolling, ultrasonic flaw detection and heat treatment. The S460N / Z35 steel plate with the maximum thickness of 260mm has good comprehensive performance, and meets the requirements for a low-alloy extra-thick steel plate of a large-scale hydraulic turbine unit, themethod is simple in process, easy to operate and high in yield, and is suitable for production in all qualified thick plate factories.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a quenched and tempered large-thickness low-alloy high-strength steel plate for hydropower and a production method thereof. Background technique [0002] In recent years, with the development of hydropower industry at home and abroad, users have higher and higher requirements for large-thickness steel plates for hydropower. Due to the special use environment of hydropower steel, the owner has very strict requirements on the strength, toughness, welding performance and corrosion resistance of the steel plate. All steel plates of this level produced in China have been normalized before, but when the thickness of the steel plate reaches a certain level, the ordinary normalizing process can no longer meet the performance requirements of the steel plate. [0003] At present, the maximum thickness of extra-thick S460N-Z35 steel for domestic hydropower is 200mm, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/06C21D1/25C21C7/10C21D8/02
CPCC22C38/02C21C7/10C21D1/25C21D8/0226C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 李杰张亚丽龙杰吕建会庞辉勇郭恒斌张西忠任鑫磊贺霄邹俊张晨光
Owner WUYANG IRON & STEEL
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