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Extra-thick structural steel with high strength and good low-temperature toughness and production method thereof

A low-temperature toughness and production method technology, which is applied in the field of steel rolling, can solve problems such as poor low-temperature toughness of high-strength and extra-thick structural steel plates, and achieve high strength, reduce energy consumption, and inhibit grain growth.

Active Publication Date: 2022-03-25
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problem of poor low-temperature toughness of high-strength and extra-thick structural steel plates, the present invention provides an extra-thick structural steel with high strength and good low-temperature toughness. The extra-thick structural steel has excellent mechanical properties, not only high strength, but also excellent Low temperature toughness, suitable for engineering structural steel in alpine regions

Method used

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  • Extra-thick structural steel with high strength and good low-temperature toughness and production method thereof
  • Extra-thick structural steel with high strength and good low-temperature toughness and production method thereof
  • Extra-thick structural steel with high strength and good low-temperature toughness and production method thereof

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Embodiment

[0084] An extra-thick structural steel with high strength and good low-temperature toughness, prepared by the following method:

[0085] (1) Obtain a slab with a thickness of 200-400mm and a width of 1800-2400mm, in terms of mass fraction, the chemical composition of the slab is:

[0086] C: ≤0.12%, Si: 0.20~0.50%, Mn: 1.00~2.00%, P: ≤0.010%, S: ≤0.003%, Al: 0.020~0.050%, Cu: ≤1.00%, Cr: ≤1.00% , Ni≤1.00%, Mo≤0.80%, and the balance is Fe and unavoidable impurities.

[0087] (2) Heating before slab rolling: the heating temperature is 1120-1170°C, and the heating time is 200min-400min.

[0088] (3) Rough rolling: 9 to 14 passes are adopted, the maximum deformation rate of a single pass is ≥15%, the rough rolling start temperature is 1050 to 1100°C, the rough rolling end temperature is 950 to 1030°C, and the intermediate billet after the rough rolling is finished Thickness ≥ 2t, t is the thickness of the extra-thick structural steel.

[0089] (4) Finish rolling: The start temp...

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Abstract

The invention provides super-thick structural steel with high strength and good low-temperature toughness, which belongs to the technical field of steel rolling and comprises the following chemical components: less than or equal to 0.12% of C, 0.20-0.50% of Si, 1.00-2.00% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.020-0.050% of Al, less than or equal to 1.00% of Cu, less than or equal to 1.00% of Cr, less than or equal to 1.00% of Ni, less than or equal to 0.80% of Mo and the balance of Fe and inevitable impurities. The extra-thick structural steel is excellent in mechanical property, high in strength, excellent in low-temperature toughness and suitable for being used as engineering structural steel in alpine regions. The invention further provides a production method of the extra-thick structural steel with high strength and good low-temperature toughness.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to an extra-thick structural steel with high strength and good low-temperature toughness and a production method thereof. Background technique [0002] The lowest temperature ever detected in the alpine region is -70°C, and the steel plate used in the alpine region needs to meet the impact toughness at a lower temperature in order to improve the safety reserve. Therefore, it is urgent to develop an extra-thick structural steel plate with high strength and good low temperature toughness. Contents of the invention [0003] In order to solve the technical problem of poor low-temperature toughness of high-strength and extra-thick structural steel plates, the present invention provides an extra-thick structural steel with high strength and good low-temperature toughness. The extra-thick structural steel has excellent mechanical properties, not only high strength, but also excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16C22C38/18C22C38/38C22C38/08C22C38/12C22C38/20C22C38/40C22C38/22C22C38/58C22C38/42C22C38/44C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/16C22C38/18C22C38/38C22C38/08C22C38/12C22C38/20C22C38/40C22C38/22C22C38/58C22C38/42C22C38/44C21D8/0226C21D2211/005C21D2211/009
Inventor 杨永达王彦锋狄国标马长文黄乐庆马龙腾周德光路士平白学军李战军韩承良何元春王根矶代锦孟冬立
Owner SHOUGANG CORPORATION
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