Oil well pipe for expandable tubular
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsKensuke NAGAI, Manabu WADA, Noboru HASEGAWA, Hirohito IMAMURA, Masakazu OZAKI
Life of this patent
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Abstract
An oil well pipe for expandable tubular, containing, in terms of % by mass: 0.020 to 0.080% of C, 0.50% or less of Si, 0.30 to 1.60% of Mn, 0.030% or less of P, 0.010% or less of S, 0.005 to 0.050% of Ti, and 0.010 to 0.500% of Al, and the balance being Fe and impurities, wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite, and pearlite is from 2.0% to 10.0%.
Claims11
An oil well pipe for expandable tubular, consisting of, in terms of % by mass:
- 0.020 to 0.080% of C,
- 0.03 to 0.50% of Si,
- 0.30 to 1.60% of Mn,
- 0 to 0.030% of P,
- 0 to 0.010% of S,
- 0.005 to 0.050% of Ti,
- 0.010 to 0.500% of Al,
- 0 to 0.100% of Nb,
- 0 to 1.00% of Ni,
- 0 to 1.00% of Cu,
- 0 to 0.50% of Mo,
- 0 to 1.00% of Cr,
- 0 to 0.100% of V,
- 0 to 0.0060% of Ca, and
- the balance being Fe and impurities,
- wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite and pearlite is from 2.0% to 10.0%.
An oil well pipe for expandable tubular, comprising, in terms of % by mass:
- 0.020 to 0.080% of C,
- 0.03 to 0.50% of Si,
- 0.30 to 1.60% of Mn,
- 0 to 0.030% of P,
- 0 to 0.010% of S,
- 0.005 to 0.050% of Ti,
- 0.010 to 0.500% of Al,
- 0 to 0.100% of Nb,
- 0 to 1.00% of Ni,
- 0 to 1.00% of Cu,
- 0 to 0.50% of Mo,
- 0 to 1.00% of Cr,
- 0 to 0.100% of V,
- 0 to 0.0060% of Ca, and
- the balance comprising Fe and impurities,
- wherein, in a metallographic microstructure, an area fraction of a first phase composed of ferrite is from 90.0% to 98.0% and an area fraction of a second phase composed of one or more selected from the group consisting of tempered martensite, tempered bainite and pearlite is from 2.0% to 10.0%.
Dependencies are inferred from the claim text.