A large-thickness 1000mpa grade non-quenched and tempered high-toughness structural steel and its preparation method

A structural steel, non-quenched and tempered technology, applied in the direction of metal rolling, etc., can solve the problems of being unable to meet ultra-high strength, large thickness, high toughness and non-quenched and tempered at the same time, and achieve the effect of reducing process costs and simplifying the process flow

Active Publication Date: 2022-06-21
SHOUGANG CORPORATION
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  • Abstract
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  • Application Information

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Problems solved by technology

[0037] In order to solve the technical problem that the existing high-strength structural steel cannot meet the requirements of ultra-high strength, large thickness, high toughness and non-quenched and tempered at the same time, the present invention provides a non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa, which can meet the requirements of large ocean Requirements for thickness, strength, plasticity and low temperature toughness of steel plates in engineering equipment, hydropower, construction machinery and other industries

Method used

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  • A large-thickness 1000mpa grade non-quenched and tempered high-toughness structural steel and its preparation method
  • A large-thickness 1000mpa grade non-quenched and tempered high-toughness structural steel and its preparation method
  • A large-thickness 1000mpa grade non-quenched and tempered high-toughness structural steel and its preparation method

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preparation example Construction

[0090] A preparation method of large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel, the method comprising:

[0091] obtaining the cast slab of the large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel;

[0092] heating, rolling, air-cooling and quenching the cast slab to obtain the large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel;

[0093] The heating temperature of the slab is 1160-1220°C;

[0094] In this application, if the heating temperature is too high, it is easy to cause coarse austenite grains, which is not conducive to the balance of strength and toughness, especially for extra-thick plates over 90 mm; too low heating temperature is not conducive to the dissolution of microalloying elements and rough rolling. Stages of austenite recrystallization.

[0095] The rolling adopts a two-stage controlled rolling process;

[0096] The quenching temperature of the q...

Embodiment 1

[0108] A large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel is prepared by the following method:

[0109] (1) Obtain the cast slab of the large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel, the slab size is 400*2000*3250mm, and in terms of mass fraction, the chemical composition of the cast slab is:

[0110] C: 0.11%, Si: 0.19%, Mn: 1.22%, P: 0.0047%, S: 0.001%, Ni: 0.92%, Cr: 0.44%, Mo: 0.39%, V: 0.056%, Cu: 0.28%, Nb: 0.027%, Ti: 0.013%, B: 0.0014%; the rest are Fe and inevitable impurities;

[0111] (2) Heating of the slab: the slab is heated to 1200°C and kept for 2.5h;

[0112] (3) Rolling: The rolling process is divided into two stages, the rolling in the recrystallization zone and the rolling in the non-recrystallization zone: the rolling temperature in the recrystallization zone is 1070 ° C, rolling to 135mm, and the cumulative pressure in the recrystallization zone is The reduction rate is 66%...

Embodiment 2

[0117] A large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel is prepared by the following method:

[0118] (1) Obtain the cast slab of the large-thickness 1000MPa grade non-quenched and tempered high-toughness structural steel, the slab size is 400*2000*3250mm, and in terms of mass fraction, the chemical composition of the cast slab is:

[0119] C: 0.13%, Si: 0.32%, Mn: 1.25%, P: 0.0049%, S: 0.00097%, Ni: 1.1%, Cr: 0.6%, Mo: 0.51%, V: 0.035%, Cu: 0.41%, Nb: 0.033%, Ti: 0.017%, B: 0.0014%; the rest are Fe and inevitable impurities;

[0120] (2) Casting billet heating: the casting billet is heated to 1206°C and kept for 130min;

[0121] (3) Rolling: The rolling process is divided into two stages, the rolling in the recrystallization zone and the rolling in the non-recrystallization zone: the rolling temperature in the recrystallization zone is 1177 ° C, rolling to 195mm, and the cumulative pressure in the recrystallization zone is The reduct...

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Abstract

The invention provides a non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa, which belongs to the field of high-strength structural steel. The chemical composition of the structural steel is: C: 0.08-0.13%, Si: 0.10-0.4%, Mn: 0.8~1.30%, P≤0.012%, S≤0.010%, Ni: 0.9~1.3%, Cr: 0.30~0.70%, Mo: 0.20~0.60%, V: 0.03~0.07%, Cu: 0.2~0.6 %, Nb: 0.02-0.045%, Ti: 0.01-0.02%, B: 0.0007-0.0014%; the rest are Fe and unavoidable impurities. The structural steel of the invention can simultaneously meet the requirements of ultra-high strength, large thickness, high toughness and non-quenching and tempering. The invention also provides a method for preparing non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa.

Description

technical field [0001] The invention belongs to the field of high-strength structural steel, and relates to a non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa and a preparation method thereof. Background technique [0002] Projects represented by construction machinery, hydroelectric power generation and marine engineering are developing towards large-scale development, and high-strength steels as key metal materials will account for more than 60%, which will gradually replace traditional low-strength steel plates. High-strength structural steel plate products are mainly developed in the direction of high strengthening, large thickness and simplified production process, and the requirements of "ultra-high strength, large thickness, high toughness, non-quenching and tempering" are put forward for the technology of high-strength structural steel products. . Specific indicators include strength requirements of more than 1000MPa, thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/48C22C38/50C22C38/54C21D8/02C21D1/18B21B3/02
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/48C22C38/50C22C38/54C21D8/0205C21D8/0226C21D8/0247C21D1/18B21B3/02C21D2211/008C21D2211/002
Inventor 狄国标何元春黄乐庆王彦锋王志勇杨永达马龙腾徐海卫于孟韩承良王根矶
Owner SHOUGANG CORPORATION
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