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H-shaped steel as well as application and production method of H-shaped steel

A production method, H-shaped steel technology, applied in the field of metal material production, can solve problems such as process differences, achieve low ductile-brittle transition temperature, strong lamellar tear resistance, and improve product quality

Inactive Publication Date: 2014-10-01
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the object of this patent is the steel plate produced by continuous casting slab, which is quite different from the H-beam produced by special-shaped billet in the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preferred implementation example 1: 300 × 200 × 12 × 12 hot-rolled H-shaped steel produced by the process of the present invention, tensile strength 520MPa, yield strength 375MPa, elongation 27.0%, -40 ℃ longitudinal V-type impact energy 218J, smelting The analysis shows that the S content is 0.07%, the carbon equivalent is 0.345%, and the Z-direction tensile area reduction rate is 24%, 22.5% and 18.5%, and all properties meet the requirements of Q345qE and Z15 in GB / T1714-2008.

Embodiment 2

[0026] Preferred implementation example 2: 300 × 200 × 12 × 12 hot-rolled H-shaped steel produced by the process of the present invention, tensile strength 575MPa, yield strength 455MPa, elongation 25.5%, -40 ℃ longitudinal V-shaped impact energy 168J, smelting The analysis shows that the S content is 0.06%, the carbon equivalent is 0.364%, and the Z-direction tensile area reduction rate is 21%, 17.5% and 20.5%, and all properties meet the requirements of Q420qE and Z15 in GB / T1714-2008.

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Abstract

The invention relates to H-shaped steel as well as an application and a production method of the H-shaped steel. The production method comprises the process steps of: molten steel pretreatment; converter smelting; argon blowing station; LF refining; fully-protective beam blank casting; H-shaped steel wire A rolling. The steel comprises the following chemical components: 0.08-0.18% of carbon, 0.15-0.35% of silicon, 1.00-1.45% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.010% of sulfur, 0.020-0.080% of vanadium, 0.010-0.060% of niobium, 0.10-0.25% of nickel, more than or equal to 0.015% of Als and a trace amount of other alloy elements. The H-shaped steel with the specification of 300*200, which is produced by using the production method of the H-shaped steel with -40 DEG C low-temperature toughness and Z-direction performance, has the -40 DEG C low-temperature toughness of more than 150J and the average Z15-direction section reduction value of larger than 27.5% and has extremely low ductile-brittle transition temperature and relatively strong lamellar tearing resistant property, and the quality of the H-shaped steel is improved.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a production method of H-shaped steel for bridges with good low-temperature toughness and Z-direction performance. Background technique [0002] Due to the high safety requirements of bridges, users put forward higher requirements for the toughness and lamellar tear resistance of bridge steel, such as easy welding, low temperature toughness and lamellar tear resistance, and are produced according to general H-shaped steel The ductile-ductile-brittle transition temperature of the H-shaped steel produced by the technological process is about -10°C. If it is used in the alpine region and low-temperature environment, it is prone to brittle fracture when it is subjected to dynamic load or impact, causing unnecessary losses. The low temperature toughness of H-shaped steel in the environment of -40°C and below must meet the requirements of E-grade steel in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 吴保桥龚庆华张卫斌吴坚邢军彦井成魏银丹蒲玉梅
Owner MAGANG (GROUP) HOLDING CO LTD
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