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Wind power H-beams and production method thereof

A production method and technology for H-beams, applied in temperature control, metal rolling, etc., can solve problems such as unfavorable product dimensions and toughness, product cracks, large residual stress, etc., and achieve excellent laminar tear resistance and corrosion resistance. , Excellent internal structure and surface quality, excellent toughness matching effect

Active Publication Date: 2013-12-25
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this application, the composition design of the steel did not strictly control the nitrogen, oxygen and hydrogen in the refining process
The precipitation of nitrogen and hydrogen makes it easy to have subcutaneous bubbles and pinholes in the billet during the continuous casting process of the profiled billet, and elongate and expand during the rolling process, resulting in crack defects in the final product
In the cooling process, the application adopts rapid cooling measures between the final rolling temperature and 500-600 ° C. This process is at the stage of the most intense phase transformation, which may bring a large residual stress. Unfavorable toughness

Method used

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  • Wind power H-beams and production method thereof

Examples

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Comparison scheme
Effect test

example 1

[0046] In this example, H-beams for wind power are produced through molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, BB1 shaped billet continuous casting, two-phase zone controlled rolling and enhanced air cooling after rolling. Details are as follows.

[0047] Desulphurization and desiliconization of hot metal strictly implement the process regulations, sulfur is controlled at 0.013%, silicon is controlled at 0.46%, and the temperature is controlled at 1280°C. After the molten iron, 8 tons of high-quality steel scrap are added to the converter, and the slag-making material is added 3 minutes before the end point. The final slag alkalinity is 3.2, the oxygen supply time is 16 minutes and 40 seconds, the end point pressure gun is 70 seconds, and the tapping time is 4 minutes and 24 seconds. First use silicon-manganese alloy for deoxidation, the addition amount is 7.5kg / t 钢 , then add silicon calcium barium deoxidation, the addition amount ...

example 2

[0052] In this example, H-beams for wind power are produced through molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, BB1 shaped billet continuous casting, two-phase zone controlled rolling and enhanced air cooling after rolling. Details are as follows.

[0053] Desulphurization and desiliconization of hot metal strictly implements the process regulations, sulfur is controlled at 0.017%, silicon is controlled at 0.44%, and the temperature is controlled at 1280°C. After the molten iron, 8.9 tons of high-quality steel scrap are added to the converter, and the slag-making material is added 3 minutes before the end point. The final slag alkalinity is 3.2, the oxygen supply time is 16 minutes and 41 seconds, the end point pressure gun is 72 seconds, and the tapping time is 4 minutes and 20 seconds. First use silicon-manganese alloy for deoxidation, the addition amount is 7.6kg / t 钢 , then add silicon calcium barium deoxidation, the addition amou...

example 3

[0058] In this example, H-beams for wind power are produced through molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, BB1 shaped billet continuous casting, two-phase zone controlled rolling and enhanced air cooling after rolling. Details are as follows.

[0059] Desulphurization and desiliconization of molten iron strictly implements the process regulations, sulfur is controlled at 0.016%, silicon is controlled at 0.45%, and the temperature is controlled at 1270°C. After molten iron, 8.3 tons of high-quality steel scrap were added to the converter, and the slag-making material was added 3 minutes before the end point. The final slag alkalinity was 3.2, the oxygen supply time was 16 minutes and 21 seconds, the end point pressure gun was 69 seconds, and the tapping time was 4 minutes and 45 seconds. First use silicon-manganese alloy for deoxidation, the addition amount is 7.7kg / t 钢 , then add silicon calcium barium deoxidation, the addition ...

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Abstract

The invention provides wind power H-beams and a production method thereof. The production method includes: smelting molten steel to obtain target molten steel; subjecting the target molten steel to beam blank continuous casting under full protection; rolling beam blanks, ensuring reduction of finish rolling to be between a austenite field and a ferrite field, and performing strengthened air cooling to obtain the wind power H-beams, wherein the target molten steel comprises, by weight, 0.14-0.22% of C, 0.20-0.50% of Si, 1.20-1.50% of Mn, not more than 0.010% of S, not more than 0.020% of P, 0.010-0.050% of Nb, not more than 40X10-6 of N, not more than 10X10-6 of O, not more than 3X10-6 of H, the balance of Fe and unavoidable impurities. The wind power H-beams are fine in low temperature impact toughness and strength, fine in internal quality and lamellar tearing resistance, fine in surface quality and fine in corrosion resistance, and can meet the requirements of wind power generation on high performance steel.

Description

technical field [0001] The invention relates to the technical field of H-shaped steel, more specifically, relates to an H-shaped steel for wind power with excellent comprehensive performance and a production method thereof. Background technique [0002] For coastal wind farms with low ambient temperature, strong wind and strong corrosion, the steel used for construction structures must have low temperature impact resistance, high strength, lamellar tear resistance and good corrosion resistance. [0003] With the vigorous development of the new energy industry, more and more coastal wind power projects will be built, which will greatly stimulate the demand for steel for wind farm structures, especially steel with excellent comprehensive properties. [0004] The Chinese patent application published on June 16, 2010 with the application number CN101736207A discloses an economical high-strength and high-weather-resistance hot-rolled H-beam steel containing niobium and vanadium. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/00B21B1/088B21B37/74
Inventor 朱京军欧阳峥容袁鹏举张思勋李超
Owner LAIWU IRON & STEEL GRP
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