| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel pipe for nitriding excellent in workability and used for parts requiring wear resistance, seizuring resistance, fatigue characteristics such as parts for tools and machine structures and automotive parts. SOLUTION: A steel pipe contg., by weight, 0.0002 to 0.20% C, 0.002 to 1.0% Si, 0.02 to 3.0% M, 0.001 to 0.030% P, 0.001 to 0.050% S, 0.0002 to 0.0100% N, and the balance Fe with inevitable impurities and in addition contg. one or >= two kinds among 0.100 to 2.0% Al, 0.05 to 5.0% Cr, 0.010 to 1.0% V and 0.005 to 1.0% Ti as nitriding promoting elemental groups is worked and formed, and, on the surface of the worked and formed body, a hard nitriding layer is formed. Even in low carbon steel and extra-low carbon steel excellent in workability in itself, sufficient surface hardness and the depth of a hardened layer after nitriding can be obtd. without deteriorating the workability.
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