The oil country tubular good for steel and its manufacturing method
2013
The steel for oil country tubular goods, the chemical composition, C, Si, Mn, Al, Mo, P, S, O, N and includes Fe and impurities as the remainder, corresponding to (211) crystal face of the α-phase carbon content indicated by mass% in chemical composition and the half width HW of the crystal plane is, satisfies the HW × C
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