CT80级非调质连续油管用钢的组织和性能控制  

Microstructure and properties control of non-quenched and tempered CT80 grade coiled tubing steel

作　　者：李明扬[1] 刘雅政[1] 周乐育[1] 袁付春[1] 朱涛[2] 饶添荣 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]马钢股份有限公司技术中心,安徽马鞍山243000

出　　处：《材料热处理学报》2012年第5期101-107,共7页Transactions of Materials and Heat Treatment

摘　　要：通过两种成分非调质CT80连续油管用钢现场生产板卷工艺组织性能对比,分析了冷却速度、卷取温度、Mo和Nb元素含量等工艺参数对实验钢组织性能的影响。结果表明:当冷却速度由52℃/s提高到69℃/s后,铁素体形态为针状铁素体,实验钢屈服强度提高25 MPa;抗拉强度提高30 MPa。实验钢在530℃卷取时,组织中出现了3%的珠光体组织,抗拉强度低于性能指标10 MPa。而在400℃卷取时,组织中出现了3%的块状马氏体组织,使得屈服强度低于性能指标20 MPa;抗拉强度提高到690MPa。Mo元素含量提高,促进针状铁素体转变,实验钢淬透性提高,有利于获得M/A岛组织,保证获得高强度低屈强比性能。Nb元素含量提高,细晶强化和析出强化作用更明显。The non-quenched and tempered CT80 grade coiled tubing steels with different composition were designed.Effects of cooling rate,coiling temperature and Mo and Nb content on microstructure and mechanical properties of the non-quenched and tempered CT80 steels were investigated.The results show that when cooling rate increases from 52 ℃/s to 69 ℃/s,acicular ferrite is obtained,and yield strength and tensile strength of the tested steel increase by 25 MPa and 30 MPa,respectively.When the coiling temperature is 530 ℃,pearlite is observed in the microstructure of the tested steel,and its tensile strength decreases by 20 MPa and yield strength increases to 690 MPa.The increase of Mo content is benefit of the formation of acicular ferrite and hardenability of tested steel,and martensite-austenite（M/A） islands increase in the microstructure.As the content of element Nb increases,it is favourable of grain refining sterngthening and precipitation strengthening of the steel.

关 键 词：连续油管 针状铁素体 显微组织 

分 类 号：TG142.4[一般工业技术—材料科学与工程]