X70管线钢在JCOE钢管生产过程中性能变化的研究.pdfVIP

X70 管线钢在 JCOE 钢管生产过程中性能变化的研究 1 2 1 1 1 查春和 杜 伟 李家鼎 李少坡 丁文华 （1. 首钢技术研究院，北京 100043 ；2. 中国石油天然气管材研究所，西安 710065 ） 1 摘 要 本文根据工业化大批量生产X70 管线钢的实际数据，分析了在JCOE 钢管成型过程中，钢管发生的形变情 况，并仔细研究了不同扩径率、不同制样方式、不同组织类型对钢管性能的影响。结果表明，扩径率越大，钢管形 变强化作用越强，屈服强度上升越明显；采用矩形试样检验钢管强度时，比采用圆棒试样检验要低45MPa ；铁素体 +珠光体组织类型管线钢制管时发生较明显的包辛格效应，屈服强度下降约20MPa ，针状铁素体类型管线钢制管后， 屈服强度变化较小，铁素体+ 贝氏体组织类型的管线钢具有较强的形变强化能力，制管后强度上升约40MPa 。 关键词 X70 JCOE 包辛格效应 扩径率 形变强化 Study of Line-pipe’s Properties Variation in JCOE Process Zha Chunhe1 Du Wei2 Li Jiading1 Li Shaopo1 Ding Wenhua1 （1. Shougang Technical Research Institute, Beijing, 100043； 2. Tubular Goods Research Institute, CNPC, Xi’an, 710065 ） Abstract This paper has analyzed the pipe deformation under the JCOE process, and studied the effects of different expanding rate, different test sample, and different types of microstructures on the performance of pipe by the industrial production data. It was revealed that the greater expanding rate is, the deformation strengthening function is stronger, and the more obvious increase in yield strength; the yield strength loss by using flat sample tested than by using bar sample tested is about 45MPa; the ferrite-pearlite pipeline steel occurs obvious Bauschinger effect in the pipe making, the pipe steel yield strength decreased by about 20MPa; acicular ferrite pipeline steel, the small changes in yield strength after pipe making; Bainite pipeline steel has a strong deformation-enhanced capacity, the pipe steel yield strength increased of about 40MPa after pipe making. Key words X70, JCOE, bauschinger effect, expanding rate, deformation-enhanced 1 引言