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Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof

A type of steel, weight percentage technology, applied in the field of H-shaped steel, can solve the problems of increasing inclusion particles, damage to process performance and service performance, inclusion cracks, etc.

Inactive Publication Date: 2008-09-03
SHANDONG IRON & STEEL CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Increase the inclusion particles, which is easy to cause inclusion cracks, which will damage the process performance and service performance

Method used

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  • Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof
  • Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof
  • Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof

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Embodiment Construction

[0018] Based on the Q345H-shaped steel that does not require special heat treatment, and in consideration of the actual steelmaking control ability and product quality, by adding boron and optimizing the steel composition, the invention obtains an H-shaped steel with good low-temperature impact toughness. The technical scheme is as follows:

[0019] A boron-added Q345H section steel with good low-temperature impact toughness, the weight percentage of the steel composition is as follows (%):

[0020] C 0.08~0.20, Mn 1.00~1.60, Si 0.10~0.55, P≤0.025, S≤0.025, Nb 0.015~0.035, B 0.0005~0.0012, and the balance is Fe and trace impurities.

[0021] Preferably, a kind of boron-added Q345H type steel, the weight percentage of steel composition is as follows (%):

[0022] C 0.10~0.18, Mn 1.00~1.40, Si 0.10~0.40, P≤0.015, S≤0.015, Nb 0.015~0.030, B 0.0005~0.0010, the balance is Fe and trace impurities.

[0023] Further preferably, a kind of boron-added Q345H type steel, the weight perce...

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Abstract

The invention relates to a boron-modified H type steel having good low-temperature impact toughness and the preparing method thereof. The steel is composed of 0.08 to 0.20 by weight percentage of C, 1.00 to 1.60 by weight percentage of Mn, 0.10 to 0.55 by weight percentage of Si, no more than 0.25 by weigh percentage of P, no more than 0.025 by weight percentage of S, 0.015 to 0.035 by weight percentage of Nb, 0.0005 to 0.0012 by weight percentage of B, and the balance Fe and trace impurity. During melting process, the gas content is controlled: no more than 0.004% of N, and no more than 0.0085% of O. According to the invention, the low-temperature impact toughness of Q345 H type steel is greatly improved; compared with Chinese standard, -40 DEG C AKV has a large surplus, the product quality is easy to be guaranteed; the Q345 H type steel can also be applied to regions having more severe condition.

Description

technical field [0001] The invention relates to an H-shaped steel used as a building component, in particular to a boron-added Q345H-shaped steel with good low-temperature impact toughness and a preparation method thereof. technical background [0002] Hot-rolled H-shaped steel is a new type of economical construction steel, which is widely used in high-rise buildings, factories, bridges, ships, lifting and transportation machinery, equipment foundations, supports, foundation piles and other fields. The product has economical and reasonable cross-sectional shape, mechanical properties Good features. Compared with I-beam, H-beam section modulus is larger. Under the same bearing conditions, it can save 10-15% of metal. Because the inside and outside of the legs are parallel, and the legs are at right angles, they can be assembled into components, which can be Save welding and riveting workload up to 25%. Compared with the concrete structure, the H-shaped steel structure can s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12
Inventor 任浩陶登奎王作成张公海高俊庆赵修领崔国涛董昌兴王学新冯伟刘军
Owner SHANDONG IRON & STEEL CO LTD
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