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Hot-rolled air-cooled bainite high-toughness and high-strength steel sheet with tensile strength larger than or equal to 1300 MPa and manufacturing method therefor

A tensile strength, high-strength steel plate technology, applied in the field of steelmaking, can solve problems such as difficult shaping and poor plate shape, and achieve the effects of cost saving, lightweight corrosion resistance, and energy consumption reduction

Inactive Publication Date: 2021-09-14
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention successfully prepares a non-tempered 1300MPa high-strength hot-rolled steel plate that meets the technical requirements. The method simplifies the production process, does not require quenching and tempering treatment, eliminates the energy consumption of quenching and tempering treatment, and improves the poor shape and difficult shaping after quenching and tempering treatment. Defects

Method used

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  • Hot-rolled air-cooled bainite high-toughness and high-strength steel sheet with tensile strength larger than or equal to 1300 MPa and manufacturing method therefor
  • Hot-rolled air-cooled bainite high-toughness and high-strength steel sheet with tensile strength larger than or equal to 1300 MPa and manufacturing method therefor
  • Hot-rolled air-cooled bainite high-toughness and high-strength steel sheet with tensile strength larger than or equal to 1300 MPa and manufacturing method therefor

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Effect test

Embodiment

[0030] Manufacture tensile strength ≥ 1300MPa hot-rolled air-cooled bainite high-toughness and high-strength steel plate according to the method of the present invention, the chemical composition and mass percentage of the test steel are as shown in Table 1 (the rest are iron and unavoidable impurities):

[0031] Table 1 Chemical composition of test steel

[0032] C mn Si P S Ti Cr V B 0.25 1.69 1.50 ≤0.010 ≤0.003 0.05 0.79 0.13 0.0020

[0033] 1. Steelmaking

[0034] 1. Hot metal pretreatment process

[0035] S ≤ 0.0030wt.% and P ≤ 0.01wt.% are put into the furnace for pretreatment, and the slag is removed; fine steel scrap is used.

[0036] 2. Converter process

[0037] The converter pulls carbon once and hits to avoid spot blowing; the ladle is purged with argon gas before tapping to control the tapping port and avoid scattered flow.

[0038] 3. Refining process

[0039] The LF+RH dual-path process is adopted, and the gas content is ...

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Abstract

The invention belongs to the technical field of steelmaking, and particularly provides a hot-rolled air-cooled bainite high-toughness and high-strength steel sheet with tensile strength larger than or equal to 1300 MPa and a manufacturing method therefor. A process comprises the following steps of steelmaking; heating; 2300-mm hot continuous rolling; hot sheet shaping and cutting; air cooling; sampling; function testing; packaging and warehousing; and delivering; during heating, a heating temperature is 1200-1250 DEG C; and during 2300-mm hot continuous rolling, a finish rolling temperature is 860-880 DEG C, and air cooling is performed to reach a room temperature after sheet shaping and cutting. According to the method, high strength and high toughness can be achieved only by air cooling after hot rolling, and a good sheet shape is kept by controlling a cooling mode; through the method, the non-quenched and tempered 1300 MPa high-strength hot-rolled steel sheet meeting technical requirements is successfully prepared, the production process of the method is simplified, and quenching and tempering treatment is not needed, so that energy consumption of quenching and tempering treatment is avoided, and the defects that the sheet shape is poor and shaping is not easy after quenching and tempering treatment are overcome; and the non-quenched and tempered 1300 MPa high-strength hot-rolled steel sheet is successfully developed and can replace imported products, so that a product blank is filled, and application cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular provides a hot-rolled air-cooled bainite high-toughness and high-strength steel plate with a tensile strength ≥ 1300 MPa and a manufacturing method thereof. Background technique [0002] At present, economically developed countries in foreign countries pay great attention to the use of high-strength structural steel in terms of steel for steel structures. The minimum strength level of the steel is 275MPa, and 420, 460, 490, 550, 590MPa steel has been used in large quantities, and corresponding matching The major industrial countries in the world have developed their own steel series for construction machinery. For example, SSAB in Sweden and JFE in Japan have developed high-strength steel plates with a strength grade of 1100MPa through reasonable microalloying composition design and advanced production technology. The steel plates of 960MPa and above required by my country'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D8/02C22C38/02C22C38/04C22C38/24C22C38/28C22C38/38
CPCC22C33/04C21D8/0226C22C38/02C22C38/04C22C38/38C22C38/28C22C38/24C21D2211/002C21D2211/001
Inventor 苗隽刘志璞闵洪刚周晏锋吴刚赵迪徐勇许学利修立民
Owner BENGANG STEEL PLATES
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