日本JFE开发的高应变用途超高强度双相管线钢-《焊管》

文章信息/Info

Title:: Super-high Strength Dual-phase Pipeline Steel for High Strain Developed by Japan JFE Company

Author(s):: Edited and Translated by QI Dian-wei; (Technology Center of An Steel Company Ltd.，Anshan 114009,Liaoning,China)

Keywords:: JFE company; high strain application; dual-phase linepipe steel; HOP process

摘要:: 为开发高可变形性能的高强度管线钢而进行的广泛研究表明，改进可变形性能的关键工艺之一是对钢的双相金相组织的控制。应用TMCP工艺可以生产铁素体-贝氏体双相金相组织的钢板。具体是，在低C无B钢经控轧及超强加速冷却后，能形成铁素体金相组织，强度最高可达X120级别。为了提高钢板的夏比冲击功性能，在加速冷却后还应用了HOP（在线热处理工艺）工艺。通过控制双相金相组织，进行了X120高应变管线钢的试生产，并简述了X120级管线钢的金相组织和性能。

Abstract:: Extensive studies have been conducted to develop high strength linepipe steel with higher deformability.One of the key process for improving deformability is dual-phase microstructure control.Steel plate with ferrite-bainite microstructure can be obtained by thermo mechanical controlled processing TMCP(a process of controlled rolling and accelerated cooling).Low carbon,boron-free steels were used to enable the ferrite formation during cooling after controlled rolling,and accelerated cooling with an ultimate cooling rate enhanced the strength up to the X120 grade.HOP(Heat-treatment On-line Process) was also applied after accelerated cooling in order to improve Charpy impact energy of the base material.Trial production of X120 grade high deformability linepipe steel was conducted by controlling dual-phase microstructure.And metallographic structure and mechanical properties of X120 grade linepipe steel with high strain are introduced in this paper.