A kind of anti-seismic steel with ultra-low yield point and its production method
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A production method and low yield point technology, applied in the field of metal materials, can solve the problems of delayed contract delivery date, increased cost, excessive yield strength, etc., to achieve the effect of improving the performance qualification rate, increasing the qualification rate and reducing the yield strength
Active Publication Date: 2017-12-05
ANGANG STEEL CO LTD
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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
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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 an anti-seismic steel with an ultra-low yield point. Ti is added to fix C atoms to reduce the hindering effect of C atoms on dislocation movement. The chemical composition of the steel is: C≤0.0015%, Si≤0.01%, Mn ≤0.05%, Ti≤0.03%, P≤0.01%, S≤0.004%, the rest Fe and unavoidable impurities. The advantage is: through the relaxation process, the ferrite grain size increases, the ferrite area fraction increases, and the yield strength decreases. The performance pass rate of the ultra-low yield point seismic steel with a yield strength of 75-125Mpa has been greatly improved. According to statistics, the pass rate of the performance of this steel in half a year is 85%, and the average pass rate has increased by 32% compared with before using this method. %, 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...
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