Ultra-thick alloy steel sheet with excellent low-temperature toughness and preparation method thereof

A low-temperature toughness and alloy steel plate technology, applied in the field of metal material processing, can solve the problems of low yield of steel ingot rolling, difficulty in ensuring high-temperature performance, and high production costs, and achieve good low-temperature toughness, excellent internal quality, and good shrinkage in the thickness direction rate effect

Active Publication Date: 2019-01-01
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN104962814B "A kind of normalized high-strength toughness 150mm extra-thick plate and its production method" discloses a 150mm extra-thick steel plate with a thickness of only 150mm, which cannot meet the requirements of large pressure vessels
Its composition does not contain alloy elements such as Cr and Mo, so it is difficult to guarantee high-temperature performance, so it is not suitable for applications in petroleum, chemical and nuclear power industries that require high-temperature performance
[0006] CN102732674A "A Production Method of Large-Thickness Low-alloy High-Strength Structural Steel Plate", relates to a method for producing extra-thick high-strength low-alloy structural steel by using 640-960 electr

Method used

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  • Ultra-thick alloy steel sheet with excellent low-temperature toughness and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] The thickness of the steel plate in this embodiment is 210mm, and its chemical composition is C: 0.15%, Mn: 0.55%, Si: 0.05%, P: 0.004%, S: 0.002%, Cr: 2.13%, Mo: 1.05% by weight , Ni: 0.16%, Al 总: 0.028% The balance is Fe and inevitable impurity elements.

[0044] The steel plate preparation method includes smelting, continuous casting billet annealing, billet preparation, rolling and heat treatment, and is characterized in that:

[0045] 1) Smelting and continuous casting

[0046] After converter smelting, slag removal, LF refining, and RH vacuum cycle degassing are carried out. The continuous casting process adopts dynamic light reduction, and the reduction amount is 11mm. Reduce the harmful elements of P, S, H, O, N in the steel, improve the purity, reduce the center segregation, center looseness, cracks and other defects of the continuous casting billet, and ensure the internal quality of the casting billet.

[0047] 2) Continuous casting billet annealing

[00...

Embodiment 2

[0057] The thickness of the steel plate in this embodiment is 210mm, and its chemical composition is C: 0.16%, Mn: 0.54%, Si: 0.03%, P: 0.005%, S: 0.001%, Cr: 2.25%, Mo: 1.03% by weight , Ni: 0.18%, Al 总 : 0.025% and the balance is Fe and inevitable impurity elements.

[0058] The steel plate preparation method includes smelting, continuous casting billet annealing, billet preparation, rolling and heat treatment, and is characterized in that:

[0059] 1) Smelting and continuous casting

[0060] After converter smelting, slag removal, LF refining, and RH vacuum cycle degassing are carried out. The continuous casting process adopts dynamic light reduction, and the reduction amount is 11mm. Reduce the harmful elements of P, S, H, O, N in the steel, improve the purity, reduce the center segregation, center looseness, cracks and other defects of the continuous casting billet, and ensure the internal quality of the casting billet.

[0061] 2) Continuous casting billet annealing ...

Embodiment 3

[0071] The thickness of the steel plate in this embodiment is 210mm, and its chemical composition is C: 0.17%, Mn: 0.52%, Si: 0.05%, P: 0.004%, S: 0.002%, Cr: 2.40%, Mo: 1.02% by weight , Ni: 0.18%, Al 总 : 0.026% The balance is Fe and inevitable impurity elements.

[0072] The steel plate preparation method includes smelting, continuous casting billet annealing, billet preparation, rolling and heat treatment, and is characterized in that:

[0073] 1) Smelting and continuous casting

[0074] After converter smelting, slag removal, LF refining, and RH vacuum cycle degassing are carried out. The continuous casting process adopts dynamic light reduction, and the reduction amount is 11mm. Reduce the harmful elements of P, S, H, O, N in the steel, improve the purity, reduce the center segregation, center looseness, cracks and other defects of the continuous casting billet, and ensure the internal quality of the casting billet.

[0075] 2) Continuous casting billet annealing

[0...

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Abstract

The invention relates to an ultra-thick alloy steel sheet with excellent low-temperature toughness. The ultra-thick alloy steel sheet is characterized in that a continuous casting blank subjected to annealing is used as a base blank to complete three-blank compounding; the thickness of the compounded blank is greater than 900mm; the procedures of vacuum electronic beam welding, compounded blank heating, rolling, and quenching-tempering heat treatment are performed, so as to produce the ultra-thick alloy steel sheet with thickness of 210mm for a pressure container. A manufacturing method of theultra-thick alloy steel sheet has the advantages that the process is short, the technology is simple, the finished rate is high, the cost is low, the production cycle is short, the efficiency is high, and the like. The mechanical properties of the produced ultra-thick alloy steel sheet can meet the requirements that the unit value of core transverse impact is greater than or equal to 200J; the percentage reduction of area along a thickness direction is greater than or equal to 60%; the ultrasonic flaw detection of the steel sheet can meet the highest level requirement of NB/T47013.3.

Description

technical field [0001] The invention belongs to the field of metal material processing, and particularly relates to an excellent low-temperature toughness extra-thick alloy steel plate and a manufacturing method thereof. Background technique [0002] At present, my country's scientific and technological strength is gradually increasing, and equipment in the fields of petroleum, chemical industry, and nuclear power is rapidly developing in the direction of large wall thickness, large size, and high performance. To more than 150mm or even more than 200mm. The difficulty of producing steel plates with a thickness of more than 200mm is that the thicker the steel plate, the worse the internal flaw detection performance and the worse the uniformity of structure and properties. At present, the production of steel plates with a thickness of more than 200mm is usually rolled by large die-cast ingots or electroslag ingots, or directly forged from ingots. However, large-scale die-cast...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/44C21D8/02C21D1/18C21D1/26
CPCC21D1/18C21D1/26C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 张建钱刚苗丕峰李经涛刘海宽孟宪震张兴国阳日隆张军
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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