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A kind of extra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and its production method

A technology of ductile-brittle transition temperature and production method, which is applied in the field of iron and steel, and can solve problems such as the difficulty in realizing the full-protection continuous casting technology

Active Publication Date: 2017-08-25
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method adopts the special-shaped billet full-protection continuous casting technology to suppress the N gas content to improve product performance, and has the ability to withstand -20°C low-temperature Charpy impact energy, but it is difficult to realize the full-protection continuous casting technology

Method used

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  • A kind of extra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and its production method
  • A kind of extra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and its production method
  • A kind of extra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and its production method

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Embodiment Construction

[0021] The present invention will be described in detail through specific embodiments below.

[0022] The hot-rolled H-shaped steel with extra-thickness and low ductile-brittle transition temperature of the present invention, its chemical composition includes: C 0.08%-0.15%, Si 0.10%-0.40%, Mn 1.0%-1.5%, P≤0.015% , S≤0.008%, V0.020%~0.070%, Ti 0.005%~0.025%, N 0.006%~0.015%, Ni 0.10%~0.50%, and the rest is iron and residual trace impurities.

[0023] The manufacture method of the hot-rolled H-shaped steel provided by the invention is specifically as follows:

[0024] The molten iron, scrap steel or the mixture of molten iron and scrap steel is smelted by a top-bottom combined blowing converter, and the steel is tapped. When tapping reaches 3 / 4, vanadium-nitrogen alloy, vanadium-iron alloy and nickel plate are added to the molten steel to remove V in the molten steel. Adjust to 0.020~0.070wt% of the total weight of molten steel;

[0025]After the converter is tapped, enter LF...

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Abstract

The invention belongs to the technical field of steel and particularly relates to ultra-thick hot-rolled H-shaped steel with a low ductile-brittle transition temperature and a production method thereof. The hot-rolled H-shaped steel is composed of, by mass, 0.08%-0.15% of C, 0.10%-0.40% of Si, 1.0%-1.5% of Mn, 0-0.015% of P, 0-0.008% of S, 0.020%-0.070% of V, 0.005%-0.025% of Ti, 0.006%-0.015% of N, 0.10%-0.50% of Ni, and the balance Fe and residual trace impurities. The flange thickness of the H-shaped steel is between 25 mm and 36 mm. The web height of the H-shaped steel is between 700 mm and 1000 mm. The rolling compression ratio of the H-shaped steel is lower than 3.5. The H-shaped steel is produced through a hot rolling process (instead of processes such as water cooling, ultrafast cooling and heat treatment). As for a final product, the yield strength reaches 420 Mpa or more, the tensile strength reaches 500 Mpa or more, the ductile-brittle transition temperature is lower than -65 DEG C, and the final product has good resistance to Charpy impact energy at the low temperature of -45DEG C to -65DEG C.

Description

technical field [0001] The invention belongs to the technical field of iron and steel. Specifically, the invention relates to a hot-rolled H-shaped steel with extra thickness and low ductile-brittle transition temperature and a production method thereof. Background technique [0002] Hot-rolled H-shaped steel is a kind of economical section steel with superior performance developed from the optimization of I-beam. It is widely used in construction, machinery, automobile manufacturing, offshore oil platforms, etc., and is known as the green steel in the 21st century. In particular, high-performance thick-walled H-shaped steel represents the development direction of H-shaped steel. The steel structure application market in the world, especially in high-tech fields such as marine industry and high-rise buildings, is more and more inclined to adopt large-scale thick-walled, high-rise steel. Performance H-shaped steel, especially extra-thick H-shaped steel with high strength and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/08C22C38/04C22C38/02C22C33/06C21D8/02
CPCC21D8/0226C22C33/06C22C38/001C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 李超韩文习张蕾武玉利杨栋化玉荣马强方金林郭秀辉田志灿
Owner SHANDONG IRON & STEEL CO LTD
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