我厂生产的GCr15SiMn(含C—1.00％、Si—0.55％、Mn—1.08％、P—0.012％、S—0.004％、Cr—1.49％)针阀体,原热处理工艺为:830℃盐浴加热——油淬——冰冷处理——175℃回火(以下简称“原工艺”)。经这种工艺处理后的针阀体,其主要问题是质量不稳定,而且寿命较低,一般只能运用三、四十小时,好的也只能运用近百小时左右。其主要缺陷反映在针阀卡死,针阀和针阀体拉伤(包括加工 The GCr15SiMn (containing C-1.00%, Si-0.55%, Mn-1.08%, P-0.012%, S-0.004%, Cr-1.49%) needle valve body manufactured by our factory has the following raw heat treatment process: 830 ℃ salt bath Heating - oil quenching - cold treatment - tempering at 175 ℃ (hereinafter referred to as “the original process”). The needle valve body after this process, the main problem is the quality is unstable, and life expectancy is low, the general can only use three or four hours, good can only use nearly a hundred hours or so. The main defects reflected in the needle stuck, needle and needle body strain (including processing