| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel for high temperature carburizing in which the coarsening of crystal grains is prevented even at high carburizing temperature exceeding 1,000°C, and mechanical properties are hard to be deteriorated, and to provide a useful method for producing the steel for high temperature carburizing. SOLUTION: This steel for high temperature carburizing contains 0.13 to 0.40% C, 0.030 to 0.40% Nb and 0.025 to <0.10% Ti. In the steel, carbides and/or carbonitrides satisfying the inequality [Ti]/[Nb]≥0.05 (wherein [Ti] and[Nb] denote each content (mass%) of Ti and N in the carbides and/or carbonitrides) exist by≥2.0×10<SP>7</SP>pieces/mm<SP>2</SP>. COPYRIGHT: (C)2006,JPO&NCIPI
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