| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material for nitriding and a nitriding steel part composed of this steel material excellent in cold-workability, weldability, tensile strength, bending fatigue strength, with a low alloy-based steel material drastically reducing the cost. SOLUTION: The steel material composed of the nitriding steel for cold-working, excellent in the weldability, the strength characteristic is composed by mass% of 0.03-0.2% C, 0.01-1.0% Si, 0.3-2.0% Mn, 1.0-5.0% Ni, 0.2-4.5% Cr, 0.5-1.5% Cu, 0.5-1.5% Al and further,≤0.03% S,≤30ppm O,≤100ppm N and satisfying the above component elements 32≤fn1≤50 and the balance Fe with inevitable impurities. Wherein, fn1=153.5C+8Mn+5.1Ni+5.2Cr. Respective component element shows the value shown with the mass%. COPYRIGHT: (C)2008,JPO&INPIT
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