超高强度石油套管低温冲击韧性浅析  

Study on the Low Temperature Impact Toughness of Ultra-high Strength Casing

作　　者：张旭[1] 李恒正[1] 扈立[1] 王正[1] 黄蓓蓓[1] 

机构地区：[1]天津钢管集团股份有限公司技术中心,天津300301

出　　处：《四川冶金》2015年第6期35-39,共5页Sichuan Metallurgy

摘　　要：通过三种热处理工艺获得140ksi、155ksi和170ksi三个不同钢级,并分别对这三个钢级进行系列低温冲击试验(20℃^-80℃),研究热处理工艺、钢级和轧制对高强度石油套管低温冲击韧性的影响。对低温脆性产生原因进行机理分析。结果表明:回火温度升高,室温韧性储备增加,韧脆转变温度降低;钢级升高,高温和低温冲击值差值减小,脆性面积百分比增加,韧脆转变温度升高;140ksi和155ksi横纵向韧脆转变温度相同,170ksi钢级套管的横向韧脆转变温度低于纵向韧脆转变温度;轧制工艺导致钢管的纵向冲击韧性优于横向。The three different grades for 140ksi. 155ksi and 170ksi were obtained through three kinds of heat treatment. A series of low temperature impact tests（20℃-80℃）for three grades were carried out. The influence of heat treatment, grade and rolling on the low temperature impact toughness of high strength casing was studied,the mechanism of low temperature brittle- ness was analysed. The results show： The room temperature toughness reserve increase with tempering temperature increase; The difference of high temperature and low temperature impact toughness value decreases, and the percentage of the brittle area increase, and the ductile-brittle temperature（DBTT）increases with the grade increases; The transverse DBTT is the same as the longitudinal DBTT of 140ksi and 155ksi. The transverse DBTT lower than the longitudinal DBTT of 170ksi casing; The longitudinal impact toughness is better than the transverse impact toughness because of the rolling.

关 键 词：低温冲击韧性 韧脆转变温度 回火温度 钢级 轧制 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]