摘要:
以棒材末架轧机后的快速冷却装置为研究对象,试验和分析了轧后快速水冷过程的主要工艺参数对钢筋性能的影响。结果表明,缩短终轧至始冷的时间间隔可提高钢筋强度,增加冷却水量、冷却时间或冷却水压可提高钢筋强度,但会降低延伸率。降低自回火温度可提高钢筋强度,但会降低延伸率。经试验研究,在国外某棒材生产线采用Q235钢种,Ø18 mm钢筋自回火温度控制在570~630℃,Ø22 mm钢筋自回火温度控制在550~650℃,Ø25mm钢筋自回火温度控制在460~520℃,均可得到满足该国标准要求的钢筋。
关键词:
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钢筋 /
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快速冷却 /
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穿水冷却 /
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强度
Abstract:
Using the quick cooling device located at the exit of final bar mill st and,The influence of main process parameters on the properties of reinforcing steel bar was tested and analyzed.The results show that the interval time between the final st and and the initial cooling can be shortened to increase the strength of reinforcing bar.Increasing water flow,cooling time or cooling water pressure can improve the strength of reinforcing bar,but it will decrease the elongation.Reducing self tempering temperature can increase the strength of reinforcing bar,but it will also decrease the elongation.Based on the research results,using the steel grade of Q235 produced at a overseas bar mill,controlling the self tempering temperature of Ø18 mm rebar in 570~630℃,Ø22 mm rebar in 550~650℃ and Ø25 mm in 460~520℃,it can obtain qualified reinforcing steel bar in accordance with the national st and ard.
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