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Extra-thick alloy steel plate 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: 2020-09-04
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • 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 electroslag remelting ingots, which has high cost and long production cycle
[0007] CN102409238B "A 42CrMo Alloy Structural Steel Extra-Thick Plate and Its Production Method", which relates to a production method for producing 80-150mm thick steel plates by using steel ingots. Because the steel ingots need to be removed from the risers and tails and other defective areas, the steel ingots are rolled The material yield is low, the production cost is high, and it is not suitable for mass production
[0010] 1. The production process is long and the process is complicated;
[0011] 2. Low yield, high cost, long production cycle and low efficiency;
[0012] 3. The product has small thickness, low alloy content, narrow application range, etc.

Method used

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  • Extra-thick alloy steel plate with excellent low-temperature toughness and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The thickness of the steel plate in this example is 210mm, and its chemical composition is calculated by weight percentage as C: 0.15%, Mn: 0.55%, Si: 0.05%, P: 0.004%, S: 0.002%, Cr: 2.13%, Mo: 1.05% , Ni: 0.16%, Al 总: The balance of 0.028% is Fe and unavoidable 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, carry out slag removal treatment, LF refining, RH vacuum cycle degassing, and continuous casting process adopts dynamic soft reduction with a reduction of 11mm. Reduce the harmful elements of P, S, H, O and N in the steel, improve the purity, reduce defects such as central segregation, loose center, cracks and other defects of the continuous casting slab, and ensure the internal quality of the casting slab.

[0047] 2) Continuous casting...

Embodiment 2

[0057] The thickness of the steel plate in this example is 210mm, and its chemical composition is calculated by weight percentage as C: 0.16%, Mn: 0.54%, Si: 0.03%, P: 0.005%, S: 0.001%, Cr: 2.25%, Mo: 1.03% , Ni: 0.18%, Al 总 : The balance of 0.025% is Fe and unavoidable 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, carry out slag removal treatment, LF refining, RH vacuum cycle degassing, and continuous casting process adopts dynamic soft reduction with a reduction of 11mm. Reduce the harmful elements of P, S, H, O and N in the steel, improve the purity, reduce defects such as central segregation, loose center, cracks and other defects of the continuous casting slab, and ensure the internal quality of the casting slab.

[0061] 2) Continuous castin...

Embodiment 3

[0071] The thickness of the steel plate in this example is 210mm, and its chemical composition is calculated by weight percentage as C: 0.17%, Mn: 0.52%, Si: 0.05%, P: 0.004%, S: 0.002%, Cr: 2.40%, Mo: 1.02% , Ni: 0.18%, Al 总 : The balance of 0.026% is Fe and unavoidable 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, carry out slag removal treatment, LF refining, RH vacuum cycle degassing, and continuous casting process adopts dynamic soft reduction with a reduction of 11mm. Reduce the harmful elements of P, S, H, O and N in the steel, improve the purity, reduce defects such as central segregation, loose center, cracks and other defects of the continuous casting slab, and ensure the internal quality of the casting slab.

[0075] 2) Continuous castin...

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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 in particular relates to an extra-thick alloy steel plate with excellent low-temperature toughness and a manufacturing method thereof. Background technique [0002] At present, my country's scientific and technological strength is gradually increasing, and the equipment in the fields of petroleum, chemical industry, and nuclear power is developing rapidly in the direction of large wall thickness, large size, and high performance requirements. The performance requirements for extra-thick steel plates are more stringent, and the demand is also increasing. To more than 150mm or even more than 200mm. The difficulty in producing steel plates with a thickness of more than 200mm lies in the fact that the thicker the steel plate, the worse the internal flaw detection performance, and the worse the uniformity of structure and performance. At present, the production of steel plates with a thick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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