40Cr特性(xing)(xing)與應用(yong)(yong)  經調(diao)質(zhi)處理后(hou)(hou)(hou)(hou)(hou)，其有良好(hao)的綜(zong)合力學性(xing)(xing)能、低(di)溫(wen) 沖(chong)擊(ji)(ji)性(xing)(xing)及(ji)低(di)的缺口(kou)敏感性(xing)(xing)，淬(cui)(cui)(cui)透(tou)韌(ren)度(du)(du)良好(hao)，·油淬(cui)(cui)(cui)時 可(ke)得到較(jiao)高(gao)(gao)的疲(pi)勞強度(du)(du)，水淬(cui)(cui)(cui)時復雜形(xing)狀的零(ling)(ling)件(jian)(jian)易 產生(sheng)裂(lie)紋.冷彎形(xing)塑性(xing)(xing)中等(deng)(deng)(deng)(deng)。正火(huo)(huo)(huo)或調(diao)質(zhi)后(hou)(hou)(hou)(hou)(hou)切削加(jia) 工性(xing)(xing)好(hao)，但焊接(jie)性(xing)(xing)不(bu)佳，易產生(sheng)裂(lie)紋，焊前應預熱(re) 到100一(yi)1500C，一(yi)般在調(diao)質(zhi)狀態下使(shi)(shi)用(yong)(yong)，還可(ke)以氰 化(hua)和高(gao)(gao)頻淬(cui)(cui)(cui)火(huo)(huo)(huo)處理  使(shi)(shi)用(yong)(yong)最(zui)廣泛的鋼種之一(yi)，調(diao)質(zhi)處理后(hou)(hou)(hou)(hou)(hou)用(yong)(yong)于制(zhi)造(zao)(zao)中 速(su)、中載(zai)的零(ling)(ling)件(jian)(jian)，如(ru)(ru)機床(chuang)齒(chi)輪(lun)、軸(zhou)(zhou)(zhou)、蝸(gua)桿、花健軸(zhou)(zhou)(zhou)、 頂針套(tao)等(deng)(deng)(deng)(deng)，調(diao)質(zhi)并表面(mian)高(gao)(gao)頗淬(cui)(cui)(cui)火(huo)(huo)(huo)后(hou)(hou)(hou)(hou)(hou)用(yong)(yong)于制(zhi)造(zao)(zao)表面(mian)高(gao)(gao)硬 度(du)(du)、耐磨的零(ling)(ling)件(jian)(jian)，如(ru)(ru)齒(chi)輪(lun)、軸(zhou)(zhou)(zhou)、主軸(zhou)(zhou)(zhou)、曲軸(zhou)(zhou)(zhou)、心軸(zhou)(zhou)(zhou)、 套(tao)簡、梢子、連桿、螺(luo)釘、螺(luo)母、進(jin)氣閥等(deng)(deng)(deng)(deng)，經淬(cui)(cui)(cui)火(huo)(huo)(huo) 及(ji)中溫(wen)回(hui)火(huo)(huo)(huo)后(hou)(hou)(hou)(hou)(hou)用(yong)(yong)于制(zhi)造(zao)(zao)重(zhong)載(zai)、中速(su)沖(chong)擊(ji)(ji)的零(ling)(ling)件(jian)(jian)，如(ru)(ru)液 壓泵(beng)轉子、滑(hua)塊、齒(chi)輪(lun)、主軸(zhou)(zhou)(zhou)、套(tao)環等(deng)(deng)(deng)(deng)，經淬(cui)(cui)(cui)火(huo)(huo)(huo)及(ji)低(di) 沮回(hui)火(huo)(huo)(huo)后(hou)(hou)(hou)(hou)(hou)用(yong)(yong)于制(zhi)造(zao)(zao)重(zhong)載(zai)、低(di)沖(chong)擊(ji)(ji)、耐磨的零(ling)(ling)件(jian)(jian)，如(ru)(ru)蝸(gua) 桿、主軸(zhou)(zhou)(zhou)、軸(zhou)(zhou)(zhou)、套(tao)環等(deng)(deng)(deng)(deng)，佩化(hua)處理后(hou)(hou)(hou)(hou)(hou)制(zhi)造(zao)(zao)尺寸(cun)較(jiao)大(da)、 低(di)溫(wen)韌(ren)度(du)(du)較(jiao)高(gao)(gao)的傳(chuan)動零(ling)(ling)件(jian)(jian)，如(ru)(ru)軸(zhou)(zhou)(zhou)、齒(chi)輪(lun)等(deng)(deng)(deng)(deng)，40Cr的代 用(yong)(yong)鋼有4OMnB, 45MnB、35SiMn, 42SiMn, 40MnVB, 42MnV, 40MnMoB, 4OMnWB等(deng)(deng)(deng)(deng)