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Electroslag-forming tempered hydroelectric steel plate and production method thereof

A technology of steel plate for hydropower and production method, applied in the field of metallurgy, can solve problems such as the inability to match strength and toughness well, and achieve the effects of enriching thermal process theory, easy operation and good isotropy

Inactive Publication Date: 2018-08-03
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In this context, the present invention has developed an electroslag-formed quenched and tempered steel plate for hydropower and its production method by optimizing the composition design and adopting the smelting method of electroslag remelting, successfully producing steel plates for hydropower stations with a thickness of 220-285 mm It has reversed the situation that domestic steel plates of this thickness and strength level all rely on imports, solved the problem that the strength and toughness of this thickness level cannot be well matched, and realized the localization of extra-thick steel plates for large hydropower stations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, electroslag-forming steel plate SXQ500D-Z35 for hydroelectricity has a thickness of 285mm, and its chemical composition and mass percentage are: C: 0.14%, Si: 0.29%, Mn: 1.10%, P: 0.006%, S: 0.001%, Cr: 0.34%, Mo: 0.41%, Ni: 0.92%, Nb: 0.032%, TAl: 0.045%, and the balance is Fe and unavoidable impurities.

[0020] The production method of SXQ500D-Z35 for electroslag forming and quenching and tempering steel plate for hydropower in this embodiment includes smelting, continuous casting, electroslag remelting, heating, rolling, annealing and heat treatment, and the specific process steps are as follows:

[0021] (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 1560 ° C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment; before vacuum, CaSi blocks are added for sph...

Embodiment 2

[0030] In this example, the steel plate SXQ500D-Z35 for electroslag forming and quenching and tempering hydropower is 260 mm thick, and its chemical composition and mass percentage are: C: 0.13%, Si: 0.26%, Mn: 1.15%, P: 0.009%, S: 0.003%, Cr: 0.32%, Mo: 0.42%, Ni: 0.90%, Nb: 0.022%, TAl: 0.040%, and the balance is Fe and unavoidable impurities.

[0031]The production method of SXQ500D-Z35 for electroslag forming and quenching and tempering steel plate for hydropower in this embodiment includes smelting, continuous casting, electroslag remelting, heating, rolling, annealing and heat treatment, and the specific process steps are as follows:

[0032] (1) Smelting process: the molten steel is first smelted in an electric furnace, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1560°C, it is transferred to a vacuum degassing furnace (VOD furnace) for vacuum treatment; before vacuum, CaSi blocks ar...

Embodiment 3

[0041] In this example, the steel plate SXQ500D-Z35 for quenching and tempering hydropower by electroslag forming is 240 mm thick, and its chemical composition and mass percentage are: C: 0.14%, Si: 0.26%, Mn: 1.15%, P: 0.010%, S: 0.002%, Cr: 0.32%, Mo: 0.40%, Ni: 0.95%, Nb: 0.023%, TAl: 0.030%, and the balance is Fe and unavoidable impurities.

[0042] The production method of SXQ500D-Z35 for electroslag forming and quenching and tempering steel plate for hydropower in this embodiment includes smelting, continuous casting, electroslag remelting, heating, rolling, annealing and heat treatment, and the specific process steps are as follows:

[0043] (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 1560 ° C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment; before vacuum, CaSi blocks a...

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Abstract

The invention discloses an electroslag-forming tempered hydroelectric steel plate and a production method thereof. The steel plate comprises the chemical components of, by mass, 0.13-0.18% of C, 0.20-0.50% of Si, 0.90-1.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.60-1.25% of Ni, 0.30-0.60% of C, 0.40-0.60% of Mo, 0.02-0.05% of Nb, 0.020-0.050% of Tal, and thebalance Fe and inevitable impurities. The production method comprises the steps of smelting, continuous casting, electroslag remelting, heating, rolling, annealing and heat treatment. The obtained steel plate has excellent isotropy, impact toughness and Z-direction performance, the looseness and segregation level is lower than or equal to level 1.0, the yield is high, and the steel plate meets the requirements of large hydraulic turbine set for low-alloy super-thick steel plates.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an electroslag formed material quenched and tempered steel plate for hydropower and a production method thereof. Background technique [0002] In recent years, with the development of the hydropower industry at home and abroad, the construction of large-scale hydropower projects such as Wudongde Hydropower Station, Baihetan Hydropower Station, and Changlongshan Hydropower Station, users have higher and higher requirements for SXQ500D-Z35 steel plates for large-thickness hydropower. The requirements for flaw detection, strength, low temperature toughness and welding performance are very strict, and the thickness of the steel plate is also increasing. [0003] In this context, the present invention has developed an electroslag-formed quenched and tempered steel plate for hydropower and its production method by optimizing the composition design and adopting the smelti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C21D8/02C21D1/18C21D1/26
CPCC22C38/02C21D1/18C21D1/26C21D8/0226C22C38/04C22C38/44C22C38/48
Inventor 邓建军李杰张亚丽吕建会庞辉勇龙杰郭恒斌吴天育任鑫磊张伟军张西忠贺霄
Owner WUYANG IRON & STEEL
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