Abstract: According to the effect of C, Mn, V, N and Ti in non-quenched-tempered microalloyed steel, the chemical composition of non-quenched-tempered steel N80 oil casing tube is designed. Based on lab furnace normalizing test data, the on-line normalizing rolling process parameters are determined. The microstructure of the non-quenched and tempered N80 steel 139.7 mm x9.17 mm oil casing tube is ferrite + pearlite with the yield strength 575 ~638 MPa, tensile strength 789 ~840 MPa, elongation 21% -23% and 3/4 size impact energy at 0℃ being 39 ~87 J fully to meet the requirements of API Spec 5CT (10th Edition ,2018).

摘要： 根据C、Mn、V、N、Ti在微合金化非调质钢中作用,设计了石油套管用非调质N80钢的化学成分;依据实验室炉正火实验数据确定在线正火轧制工艺参数,研制的139.7 mm×9.17 mm非调质N80钢石油套管的组织为铁素体+珠光体组织,屈服强度575～638 MPa,抗拉强度789～840 MPa,伸长率21%～23%,0℃3/4尺寸冲击功39～87J,完全满足API Spec 5CT《油套管规范》(第十版,2018)标准的要求。