| 摘要 |
After maintaining the proportion of steel kind comprising 0.51-1.60 % by weight of C, 1.20-1.60 wt.% of Si, 0.60-0.90 wt.% of Mn, 0.6-0.9 wt.% of Cr, not more than 0.0035 wt.% of P, not more than 0.035 wt.% of S, residual Fe and inevitably contained impurity at 1050-1100 deg.C for 2 hours, the steel is stripped under heating state, the stripped wire product is rapidly cooled to 760-790 deg.C by spraying water and wound in a coil shape, cooled to 670±30 deg.C at a cooling rate of 1.4±0.4 deg.C/sec, and then slowly cooled to 595±65 deg.C at a cooling rate of 0.6±0.3 deg.C/sec, and then air cooled to obtain a wire material for valve spring.
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