Low-temperature and high-toughness hot rolled H-shaped steel with yield strength of 550 MPa and preparation method thereof

A technology of yield strength and H-shaped steel, applied in heat treatment equipment, furnace type, heat treatment furnace, etc., can solve the problem that hot-rolled H-shaped steel cannot meet high strength and high toughness at the same time, achieve the matching of strength and toughness, and improve safe use Sexuality, the effect of reducing requirements

Active Publication Date: 2018-03-13
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 550 MPa, which can completely solve the stability and consistent production problems of high-strength, low-temperature and high-toughness hot-rolled H-shaped steel comprehensive per

Method used

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  • Low-temperature and high-toughness hot rolled H-shaped steel with yield strength of 550 MPa and preparation method thereof
  • Low-temperature and high-toughness hot rolled H-shaped steel with yield strength of 550 MPa and preparation method thereof
  • Low-temperature and high-toughness hot rolled H-shaped steel with yield strength of 550 MPa and preparation method thereof

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[0026] Example 1

[0027] A 550MPa-grade low-temperature high-toughness hot-rolled H-section steel and its production process. The chemical composition of the H-section steel of the present invention is (%) by weight: C: 0.10, Si: 0.35, Mn: 1.55, P: 0.015 , S: 0.006, V: 0.08, the rest is Fe and unavoidable impurities.

[0028] The H-beam production process is as follows: take the specification H200x200x9x15 as an example, heat the cast slab with the above composition through a heating furnace to 1240°C for 120 minutes, and the final rolling temperature of the universal rolling mill is 940°C. After rolling, it is cooled by air cooling and passed through a straightening saw. The H-shaped steel cut to length is treated by two-stage rapid electromagnetic induction heating. The first stage preheats the H-shaped steel from room temperature to 620℃, and the second stage is immediately heated to 920℃, and then the H-shaped steel flange and After the web is quenched and cooled to room temp...

Example Embodiment

[0030] Example 2

[0031] A 550MPa-grade low-temperature high-toughness hot-rolled H-beam steel and its production process. The chemical composition of the H-beam steel of the present invention is (%) by weight: C: 0.14, Si: 0.25, Mn: 1.23, P: 0.016 , S: 0.016, V: 0.065, the rest is Fe and unavoidable impurities.

[0032] The H-beam production process is: taking the specification H200x200x9x15 as an example, the casting slab with the above composition is heated to 1260°C in a heating furnace for 125 minutes, and the final rolling temperature of the universal rolling mill is 1000°C. After rolling, it is cooled by air cooling and passed through a straightening saw. The H-shaped steel cut to length is treated by two-stage rapid electromagnetic induction heating. In the first stage, the H-shaped steel is preheated from room temperature to 650℃, and the second stage is immediately heated to 950℃, and then the H-shaped steel flange and After the web is quenched and cooled at 60°C / s to r...

Example Embodiment

[0034] Example 3

[0035] A 550MPa-grade low-temperature and high-toughness hot-rolled H-section steel and its production process. The chemical composition of the H-section steel of the present invention is (%) by weight: C: 0.16, Si: 0.35, Mn: 0.7, P: 0.014 , S: 0.007, V: 0.045, the rest is Fe and unavoidable impurities.

[0036] The H-beam production process is as follows: take the specification H200x200x9x15 as an example, heat the casting slab with the above composition to 1200°C in a heating furnace and hold for 140 minutes. The final rolling temperature of the universal rolling mill is 970°C. After rolling, it is cooled by air cooling and passed through a straightening saw. The H-shaped steel cut to length is treated by two-stage rapid electromagnetic induction heating. The first stage preheats the H-shaped steel from room temperature to 600℃, and the second stage is immediately heated to 900℃, and then the H-shaped steel flange and After the web is quenched and cooled at 30...

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Abstract

The invention discloses low-temperature and high-toughness hot rolled H-shaped steel with the yield strength of 550 MPa and a preparation method thereof. The low-temperature and high-toughness hot rolled H-shaped steel with the yield strength of 550 MPa is prepared from the following chemical components according to weight percent (%): 0.10% to 0.16% of C, 0.25% to 0.45% of Si, 0.70% to 1.55% of Mn, less than or equal to 0.030% of P, less than or equal to 0.025% of S, 0.045% to 0.08% of V, 0.008% to 0.012% of N and the balance of Fe and inevitable impurities. The production process of the steel comprises the following steps of continuous casting billet heating, rough rolling, universal rolling, saw cutting to a length and heat treatment. According to the low-temperature and high-toughnesshot rolled H-shaped steel and the preparation method, the components are rolled by adopting a conventional process, then the saw cutting to the length is performed, the production process of completequenching and tempering is adopted to the H-shaped steel, finally, tempered sorbite, bainite and fine carbide which is dispersed on the tempered sorbite and the bainite are obtained in the H-shaped steel, the yield strength of the H-shaped steel is not less than 550 MPa, the average longitudinal impact work at -60 DEG C is greater than 50 J, and the low-temperature and high-toughness hot rolled H-shaped steel has low ductile-brittle transition temperature.

Description

technical field [0001] The invention belongs to the technical field of metallurgy. Specifically, the invention relates to a low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 550 MPa and a preparation method thereof. Background technique [0002] In major national infrastructure projects, further emphasis will be placed on energy conservation, emission reduction and lightweight transportation equipment, to accelerate the green transformation and upgrading of the manufacturing industry, and to promote the development of steel, petrochemical, construction machinery, light industry, textile and other industries to the high end of the value chain. To this end, it is necessary to further increase the research intensity of steel materials, and devote ourselves to the development of new, high-strength, toughness, lightweight steel materials, reduce the consumption of energy and resources, and promote sustainable economic and social development. Moreov...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/00C21D1/18C21D9/00
Inventor 杜传治方金林尚国明
Owner SHANDONG IRON & STEEL CO LTD
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