胡楚江, 邓叙燕, 潘恩宝, et al. Research and Prodution on Non-Queched-Tempered Steel N80 Φ139.7 mm x 9.17 mm Oil Casing Tube[J]. Special Steel, 2020, 41(4): 19-21.
胡楚江, 邓叙燕, 潘恩宝, et al. Research and Prodution on Non-Queched-Tempered Steel N80 Φ139.7 mm x 9.17 mm Oil Casing Tube[J]. Special Steel, 2020, 41(4): 19-21.DOI:
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