【摘 要】
：
The current trend of 500MPa high strength ribbed bars was studied.The influence factors of mechanical properties were investigated by analyzing the final co
【机 构】
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Long Product Department of Tangshan Iron and Steel Company,Hebei Iron and Steel Group9 Binhe Rd,Tang
论文部分内容阅读
The current trend of 500MPa high strength ribbed bars was studied.The influence factors of mechanical properties were investigated by analyzing the final control of converter,optimization of chemical composition,deoxidation alloying,soft blowing system,stable continuous casting and heating system.Based on using different overseas and domestic vanadium-nitrogen alloy,the principle of vanadium micro-alloying for 400MPa and 500MPa steel bars were discussed.The mechanical properties were analyzed when using different micro-alloying methods,the 90-day aging experiment was carried out to study the change of mechanical properties.It was showed that the content of V,C,Mn had obviously effect on mechanical properties,of which content of vanadium was the main factor.Meanwhile,it was beneficial to improve the mechanical performance by increasing the content of free nitrogen.
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