| 摘要 |
To provide a valve spring retainer made of titanium, capable of reduction in raw material cost and processing cost, a valve spring retainer is formed out of a titanium alloy raw material composed of 0.8 wt %<=Fe<=1.2 wt %, 0.24 wt %<=O<=0.32 wt %, 0.02 wt %<=N<=0.05 wt %, and balance Ti containing unavoidable impurities through cold forging.
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