Development of HRB500E High Strength Anti-seismic Rebars by Microalloying and Controlled Cooling Process
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摘要: 针对红河钢铁有限公司炼钢、轧钢工艺装备,采用微合金化控轧控冷工艺生产HRB500E高强度抗震钢筋,并利用金相显微镜、拉力试验机对钢筋的力学性能、金相显微组织、夹杂物进行检验。结果表明:钢筋强韧性适中,具有较好的抗震性能和低应变时效性;控制钢中Mn含量小于1.55%,Nb含量小于0.025%,控冷终止温度大于680℃,钢筋心部组织为铁素体+珠光体+5%贝氏体,综合性能较佳。Abstract: Considering the existing equipment available in the steelmaking and rolling plants of Honghe Iron and Steel Co.,Ltd.,HRB500E high strength anti-seismic rebars were developed by microalloying,controlled rolling and controlled cooling process and mechanical properties,microstructures,inclusions of rebars so produced were tested by tensile testing machine and metallographic microscopy.The results showed that the rebars exhibited moderate strength ＆ toughness,good anti-seismic performance and low strain aging;Besides,they boosted preferable comprehensive performance,featuring a final temperature after controlled cooling greater than 680 ℃,Mn content less than 1.55%,Nb content less than 0.025%,and core microstructure of ferrite + pearlite +5% bainite.
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