執(zhí)行器IC20-15W3T芯科技，芯創(chuàng)新；85311040
一種方法是淬火，單純提高硬度，但是韌性差，易斷裂；二是淬火后退火，提高硬度同時(shí)不降低韌性；三是滲碳或滲氮或碳氮共滲，提高表面硬度，內(nèi)部不變。號(hào)鋼淬火后沒(méi)有回火之前，硬度大于HRC55（可達(dá)HRC62）為合格。實(shí)際應(yīng)用的硬度為HRC55（高頻淬火HRC58）。GB/T699-1999標(biāo)準(zhǔn)規(guī)定45鋼抗拉強(qiáng)度為6MPa，屈服強(qiáng)度為355MPa，伸長(zhǎng)率為16%，斷面收縮率為4%，沖擊功為39J硬度：未熱處理≤229HB；退火鋼≤197HB，淬火后表面硬度可達(dá)45～52HRC。
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