STEEL WIRE MATERIAL FOR SPRING HAVING EXCELLENT CORROSION FATIGUE PROPERTY

STEEL WIRE MATERIAL FOR SPRING HAVING EXCELLENT CORROSION FATIGUE PROPERTY

PROBLEM TO BE SOLVED: To provide a steel for a spring having fatigue properties more excellent than those by a prior art. SOLUTION: The steel for a spring contains C, and the balance iron and inevitable impurities, wherein ferrite decarburized layer depth is 0 mm; Ceq1 in equation (1) below is 0.580...

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Bibliographische Detailangaben
Hauptverfasser: YOSHIHARA SUNAO, NAGAMATSU KIYOKA
Format: Patent
Sprache:eng
Schlagworte:
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a steel for a spring having fatigue properties more excellent than those by a prior art. SOLUTION: The steel for a spring contains C, and the balance iron and inevitable impurities, wherein ferrite decarburized layer depth is 0 mm; Ceq1 in equation (1) below is 0.580 or more; Ceq2 in equation (2) below is 0.49 or less, and Ceq3 in equation (3) below is 0.570 or less: equation (1) Ceq1=[C]+0.11[Si]-0.07[Mn]-0.05[Ni]+0.02[Cr]; equation (2) Ceq2=[C]+0.30[Cr]-0.15[Ni]-0.70[Cu]; and equation (3) ceq3=[C]-0.04[Si]+0.24[Mn]+0.10[Ni]+0.20[Cr]-0.89[Ti]-1.92[Nb];in the above equations, [ ] shows the content (mass%) of each element in steel. COPYRIGHT: (C)2009,JPO&INPIT