摘要
研究推制式生产和低温形变退火的大口径P91无缝热扩钢管的显微组织、晶粒度、非金属夹杂物和室温力学性能,并与原管和热扩后经正火+回火处理的热处理钢管进行对比。结果表明,推制式低温形变退火生产的热扩钢管显微组织为回火马氏体,晶粒度6级,纵向和横向屈服强度、抗拉强度、伸长率、布氏硬度分别达到565、740 MPa,25%,220 HB和540、730 MPa,24%,218 HB。P91无缝钢管在低温形变退火后,屈服强度、抗拉强度、硬度略微下降,显微组织、晶粒度和非金属夹杂物与低温形变退火前保持一致,符合ASTM A335标准对P91和GB 5310—2008标准对10Cr9Mo1VNbN的要求。
Microstructure,grain size,non-metallic inclusion and mechanical properties of P91 large-sized hot-expanded steel tube with low temperature thermomechanical annealing were investigated.It was compared with crude seamless steel tube and hot-expanded steel tube with normalizing＋tempering.The results indicate that the microstructure of the hot-expanded steel tube with the low temperature thermomechanical annealing is tempered martensite,and the longitudinal and horizontal yield strength,tensile strength,elongation,brinell hardness reach approximately 565 MPa,740 MPa,25%,220 HB and 540 MPa,730 MPa,24%,218 HB respectively.These mechanical properties of P91 hot-expanded steel tube decrease slightly,while the microstructure,grain size,non-metallic inclusion keep consistent before and after the low temperature thermomechanical annealing.The test results fully meet the requirements of ASTM A335 to P91 and GB 5310—2008 to 10Cr9Mo1VNbN.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第4期69-72,共4页
Heat Treatment of Metals
关键词
P91无缝钢管
低温形变退火
热扩钢管
P91 seamless steel tube
low temperature thermomechanical annealing
hot-expanded steel tube
