Seamless steel pipe and method of manufacturing the same
a technology of seamless steel pipe and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of not having good ssc resistance in a reliable manner, not sufficiently considering reducing the hardness of the surface layer or thus improving ssc resistance, etc., to achieve good ssc resistance
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[0124]The present invention will be described using specific examples. The present invention is not limited to these examples.
[0125]A plurality of seamless steel pipes with various chemical compositions were produced and their yield strength, tensile strength, surface hardness and sour resistance were investigated.
[0126][Investigation Methods]
[0127]A plurality of steels having the chemical compositions shown in Table 1 were melt and were subjected to continuous casting to produce round billets for pipe forming. Steels A, C, D1, D2 and J in Table 1 are steels in which the chemical composition or the value of Ceq does not meet the requirements of the present invention.
TABLE 1Chemical Composition (in mass %, balance being Fe and impurities)SteelCSiMnPSCuCrNiMoTiVNbAlCaONCeqA0.0590.121.530.0050.00070.200.280.230.100.0030.05—0.0310.00080.00150.00360.429B0.0610.111.510.0080.00090.200.310.310.250.0030.05—0.0320.00170.00180.00500.468C0.0700.091.420.0110.00050.410.310.390.350.0050.05—0.0300....
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