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Large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel and preparation method thereof

A kind of structural steel, non-quenched and tempered technology, applied in the direction of metal rolling, can solve the problems of super high strength, large thickness, high toughness and non-quenched and tempered at the same time, and achieve the effect of reducing process cost and simplifying process flow

Active Publication Date: 2022-02-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel and preparation method thereof
  • Large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel and preparation method thereof
  • Large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel and preparation method thereof

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preparation example Construction

[0090] A method for preparing non-quenched and tempered high-toughness structural steel with a large thickness of 1000MPa, the method comprising:

[0091] obtaining the slab of the 1000MPa-level non-quenched and tempered high-toughness structural steel;

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

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

[0094] In this application, if the heating temperature is too high, it will easily lead to 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 quenching is 870-930°C.

[0097]In this app...

Embodiment 1

[0108] A non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa, 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 cast slab size is 400*2000*3250mm, and 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 is Fe and unavoidable impurities;

[0111] (2) Billet heating: the billet is heated to 1200°C and kept for 2.5 hours;

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

Embodiment 2

[0117] A non-quenched and tempered high-toughness structural steel with a large thickness of 1000 MPa, 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 cast slab size is 400*2000*3250mm, and 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 is Fe and unavoidable impurities;

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

[0121] (3) Rolling: The rolling process is divided into two stages, rolling in the recrystallization zone and rolling in the non-recrystallization zone: the rolling start temperature in the recrystallization zone stage is 1177 ° C, rolling to 195mm, and the cumulative pressure in the recrystallization zone The reduction rate is 51%, and the maxi...

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Abstract

The invention provides large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel, which belongs to the field of high-strength structural steel. The structural steel comprises the following chemical components: 0.08 to 0.13 percent of C, 0.10 to 0.4 percent of Si, 0.8 to 1.30 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.010 percent of S, 0.9 to 1.3 percent of Ni, 0.30 to 0.70 percent of Cr, 0.20 to 0.60 percent of Mo, 0.03 to 0.07 percent of V, 0.2 to 0.6 percent of Cu, 0.02 to 0.045 percent of Nb, 0.01 to 0.02 percent of Ti, 0.0007 to 0.0014 percent of B and the balance of Fe and inevitable impurities. The structural steel disclosed by the invention can simultaneously meet the requirements of ultrahigh strength, large thickness, high toughness and non-hardening and non-tempering. The invention further provides a preparation method of the large-thickness 1000MPa-grade non-quenched and tempered high-toughness structural steel.

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, hydropower and ocean engineering are developing in the direction of large-scale development, and the proportion of high-strength steel as the key metal material will exceed 60%, which will gradually replace traditional low-strength steel plates. High-strength structural steel medium and heavy plate products are mainly developed in the direction of high strength, large thickness and simplified production process, and the requirements for high-strength structural steel products are "ultra-high strength, large thickness, high toughness, and non-quenched and tempered" . Specific indicators include strength requirements of over 1000MPa, thickness over 90mm, impact tough...

Claims

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Application Information

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Patent Type & Authority Applications(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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