建筑用高强度低屈强比钢板的冷却工艺  

Cooling process of high strength and low yield ratio steel plates for buildings

作　　者：康健[1] 王昭东[1] 王国栋[1] 袁国[1] 周晓光[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《材料热处理学报》2010年第11期79-84,共6页Transactions of Materials and Heat Treatment

基　　金：中央高校基本科研业务费资助(N090607001);国家科技支撑计划项目(2006BAE03A08)

摘　　要：利用MMS-300型热力模拟实验机及450mm热轧机,研究了控轧后冷却工艺制度对试验钢组织及性能的影响。结果表明:单一的板条组织具有较高的强度,但不利于屈强比的控制,屈强比高达0.94;而以贝氏体铁素体作为软相基体,其上弥散分布着细小的岛状M-A组元为硬质相的复相组织可以满足高强度及低屈强比。当终冷温度为550℃左右时,屈服强度为650MPa,抗拉强度达955MPa,保证了较低的屈强比为0.68。Effect of cooling process on microstructure and mechanical properties of structural steel for buildings was studied in laboratory by a MMS-300 thermal simulator and a 450 mm mill.The results show that the steel with microstructure of single lath bainite has high strength,but the yield ratio is up to 0.94.The steel with microstructure composed of bainite ferrite matrix（soft phase）and fine martensite-austenite（M-A,hard-phase）exhibits higher strength and lower yield ratio.When the final cooling temperature is 550 ℃,the steel has the optimum microstructure and mechanical properties：yield strength is 650 MPa,tensile strength is 955 MPa and yield ratio is 0.68.

关 键 词：建筑用钢 冷却工艺 显微组织 力学性能 

分 类 号：TG142.4[一般工业技术—材料科学与工程]