Low-temperature high-toughness hot rolled H-shaped steel with yield strength being 500MPa and preparation method thereof

A yield strength, H-beam technology, applied in the field of metallurgy, can solve the problem that hot-rolled H-beam cannot meet high strength, high toughness and uniform section performance at the same time, and achieves the matching of strength and toughness, and improves welding performance and strength. Effect

Active Publication Date: 2018-04-27
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 500 MPa and its preparation method, which can completely solve the stability and consistency production problems of high-strength, low-temperature high-toughness hot-rolled H-shaped steel comprehensive performance requirements, Meet the needs of high-performance products in special fields, and fundamentally solve the problem that the hot-rolled H-beams in the production line of existing process equipment cannot simultaneously meet the requirements of high strength, high toughness and uniform cross-sectional properties

Method used

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  • Low-temperature high-toughness hot rolled H-shaped steel with yield strength being 500MPa and preparation method thereof
  • Low-temperature high-toughness hot rolled H-shaped steel with yield strength being 500MPa and preparation method thereof
  • Low-temperature high-toughness hot rolled H-shaped steel with yield strength being 500MPa and preparation method thereof

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Embodiment 1

[0029] A low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 500 MPa and its production process. The chemical composition of the H-shaped steel according to the present invention is (%) by weight: C: 0.16, Si: 0.25, Mn: 0.7, P: 0.018 , S: 0.010, Nb: 0.015, B: 0.0025, and the rest are Fe and unavoidable impurities.

[0030] The H-shaped steel production process is as follows: taking the specification H200x200x9x15 as an example, the casting slab with the above composition is heated to 1240°C through a heating furnace, and kept for 120 minutes. The final rolling temperature of the universal rolling mill is 940°C. The cut-to-length H-beam is treated with two-stage rapid electromagnetic induction heating. In the first stage, the H-beam is preheated from room temperature to 620°C, and the second stage is immediately heated to 850°C. Then, the H-beam flange and After the web was quenched and cooled at 40°C / s to room temperature, it was rapidly heated to...

Embodiment 2

[0033] A low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 500 MPa and its production process. The chemical composition of the H-shaped steel according to the present invention is (%) by weight: C: 0.10, Si: 0.30, Mn: 1.55, P: 0.013 , S: 0.009, Nb: 0.035, B: 0.0010, and the rest are Fe and unavoidable impurities.

[0034] The H-beam production process is as follows: taking the specification H200x200x9x15 as an example, the cast slab with the above composition is heated to 1260°C in a heating furnace and kept for 125 minutes. The final rolling temperature of the universal rolling mill is 1000°C. The cut-to-length H-beam is treated with two-stage rapid electromagnetic induction heating. In the first stage, the H-beam is preheated from room temperature to 650°C, and the second stage is immediately heated to 880°C. Then, the H-beam flange and After the web was quenched and cooled at 60°C / s to room temperature, it was rapidly heated to 620°C for temp...

Embodiment 3

[0037] A low-temperature high-toughness hot-rolled H-shaped steel with a yield strength of 500 MPa and its production process. The chemical composition of the H-shaped steel according to the present invention is (%) by weight: C: 0.12, Si: 0.45, Mn: 1.25, P: 0.023 , S: 0.005, Nb: 0.020, B: 0.0018, and the rest are Fe and unavoidable impurities.

[0038] The H-beam production process is as follows: taking the specification H200x200x9x15 as an example, the cast slab of the above composition is heated to 1200°C through a heating furnace, and kept for 140 minutes. The final rolling temperature of the universal rolling mill is 970°C. The cut-to-length H-beam is treated with two-stage rapid electromagnetic induction heating. In the first stage, the H-beam is preheated from room temperature to 600°C, and the second stage is immediately heated to 830°C. Then, the H-beam flange and After the web was quenched and cooled at 30°C / s to room temperature, it was rapidly heated to 580°C for t...

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Abstract

The invention discloses low-temperature high-toughness hot rolled H-shaped steel with the yield strength being 500MPa and a preparation method thereof. The low-temperature high-toughness hot rolled H-shaped steel with the yield strength being 500MPa comprises, by mass, 0.10-0.16% of C, 0.25-0.45% of Si, 0.70-1.55% of Mn, 0-0.030% of P, 0-0.025% of S, 0.015-0.035% of Nb, 0.0010-0.0025% of B, and the balance Fe and inevitable impurities. The production technology process of the steel comprises the following steps of continuous casting slab heating, rough rolling, universal rolling, saw cutting and sizing, and heat treatment. According to the low-temperature high-toughness hot rolled H-shaped steel with the yield strength being 500MPa and the preparation method thereof, after conventional technology rolling, saw cutting and sizing based on the components, the production technology including subcritical quenching and tempering is applied to the H-shaped steel, tempered sorbites, ferrites which are arranged in an approximately equiaxial distribution mode, and fine carbide distributed on the H-shaped steel in a dispersion mode are obtained, the effects that the yield strength of the H-shaped steel is not lower than 500MPa, and the longitudinal ballistic work at the temperature of -60 DEG C is averagely larger than 49J are achieved, and the extremely-low ductile-brittle transition temperature is realized.

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 500 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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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/00
Inventor 杜传治方金林尚国明
Owner SHANDONG IRON & STEEL CO LTD
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