Nb-Cr微合金化准φ25mmⅢ级带肋钢筋成分优化与组织性能  

Chemical Composition Optimization of 25 mm Ⅲ Level Ribbed Bar with Nb-Cr Micro-alloying and Its Microstructure and Mechanical Properties

作　　者：赵文成[1] 贾继华[1] 齐长发[2] 赵育新[1] 

机构地区：[1]唐山科技职业技术学院,冶金系,河北唐山063001 [2]河北唐钢集团技术中心,河北唐山063016

出　　处：《热加工工艺》2011年第12期64-66,共3页Hot Working Technology

摘　　要：采用Nb-Cr微合金化控冷工艺进行准25 mmⅢ级带肋钢筋工业生产试验,对实验钢筋的生产工艺、化学成分、力学性能及金相组织进行了分析。结果表明,Nb-Cr微合金化控制冷却生产的Ⅲ级带肋钢筋的金相组织为表层回火S、心部F+P,F的晶粒度为9.0～9.5级,并且P量较多,实验钢筋屈服强度、抗拉强度和断后伸长率分别比标准要求高65 MPa、70 MPa和6.5%。在此基础上对Ⅲ级带肋钢筋进行成分优化,降低合金元素Mn、Cr、Nb的含量,成分优化后钢筋力学性能符合Ⅲ级带肋钢筋标准,达到了降低生产成本的目的。The φ25 mm Nb-Cr micro-alloyed Ⅲ level bar was produced by controlled cooling industrial trial process,The production process,chemical composition,mechanical properties and microstructure of the testing ribbed bar were analyzed.The results show that the microstructure of the tested ribbed bar is tempered S-（F ＋ P） from surface to core.The ferrite grain size in the core is 9.0～9.5 level and more pearlite is formed.The tensile strength,yield strength and elongation after fracture is 65 MPa,70 MPa and 6.5% higher than those of the standard requirement,respectively.The chemical composition is optimized,the Mn,Cr,Nb content is decreased.The mechanical properties of the tested ribbed bar qualify the requirement of Ⅲ level ribbed bar,and the production cost is decreased.

关 键 词：成分优化 带肋钢筋 组织 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]