Anti-seismic steel with ultralow yield point and production method thereof

A production method and yield point technology, applied in the field of metal materials, can solve problems such as increased cost, delayed contract delivery date, and yield strength exceeding the standard, and achieve the effect of improving the performance pass rate, increasing the pass rate, and reducing the yield strength

Active Publication Date: 2016-11-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when this steel type is produced, the yield strength often exceeds the standard. The steel plate that exceeds the standard needs to be rescued by subsequent heat treatment, which increases the cost and delays the contract delivery date

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An anti-seismic steel with an ultra-low yield point, the chemical composition of which is calculated by weight percentage:

[0021] C: 0.0012%, Si: 0.009, Mn: 0.045%, Ti: 0.025%, P: 0.009%, S: 0.0036%, the rest Fe and unavoidable impurities.

[0022] A method for producing the ultra-low yield point seismic steel according to claim 1, the production steps include heating-descale-rolling-straightening-fire cutting-warehousing, and the rolling process includes the following steps:

[0023] 1) The heating temperature of the billet is 1180°C, and the heat preservation is 120min; the hot rolling is divided into two stages of rolling, the total reduction in the first stage is 55%, the total reduction in the second stage is >60%, and the final rolling temperature is 950°C;

[0024] 2) After rolling, wait for temperature relaxation, the relaxation time is 20s, which can be adjusted appropriately according to the climate, temperature drop rate, and furnace temperature. .

Embodiment 2

[0026] An anti-seismic steel with an ultra-low yield point, the chemical composition of which is calculated by weight percentage:

[0027] C: 0.001%, Si: 0.003%, Mn: 0.03%, Ti: 0.03%, Als: 0.03%, P≤0.01%, S≤0.003%, and the rest are iron and unavoidable trace impurities.

[0028] The thickness of the continuous casting slab is 250mm, and the thickness of the rolled product is 30mm. The rolling is controlled in two stages. The first stage adopts large reduction, the deformation of each pass is controlled at 15-25%, and the final rolling temperature is controlled above 950°C; In the second stage, the starting rolling temperature is controlled at 940°C, the final rolling temperature is 950°C, and the deformation rate is controlled at 60%. After entering the hot leveling machine, the stacking is slowly cooled, and the stacking temperature is not lower than 400°C, and the time is not less than 16 hours.

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Abstract

The invention relates to anti-seismic steel with an ultralow yield point. Ti is added to fix C atoms so as to reduce the hindering effect of the C atoms on dislocation movement; the anti-seismic steel contains the following chemical components in percentage by weight: less than or equal to 0.0015 percent of C, less than or equal to 0.01 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.03 percent of Ti, less than or equal to 0.01 percent of P, less than or equal to 0.004 percent of S, and the balance of Fe and unavoidable impurities. The anti-seismic steel has the advantages that due to a relaxation process, crystalline grains of ferrite are enlarged, so that the area fraction of the ferrite is increased, and the yield strength is reduced; the performance qualification rate of the anti-seismic steel with the ultralow yield point and the yield strength of 75 to 125 Mpa is greatly improved; according to the statistics, the performance qualification rate within half-a-year production of the type of steel is 85 percent; compared with the conventional method, the production method disclosed by the invention has the advantages that the average qualification rate is increased by 32 percent, and the effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to an anti-seismic steel with an ultra-low yield point and a production method thereof. Background technique [0002] The required range of yield strength of ultra-low yield point steel is 75-125Mpa. At present, only Baosteel and Anshan Iron and Steel can produce such products in China. They are mainly used to make energy dissipation dampers in steel structures to improve the seismic performance of buildings. [0003] At present, when this steel type is produced, the yield strength often exceeds the standard. The steel plate that exceeds the standard needs to be rescued by subsequent heat treatment, which increases the cost and delays the contract delivery date. Contents of the invention [0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an ultra-low yield point seismic steel with a yield strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/00
Inventor 刘源应传涛乔馨李新玲丛津功王若钢刘浩岩张紫茵杨军陈华
Owner ANGANG STEEL CO LTD
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