產品細節圖

45#是(shi)(shi)(shi)(shi)鋼(gang)(gang)(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)牌號(hao)(hao)是(shi)(shi)(shi)(shi)一(yi)(yi)(yi)種優質(zhi)(zhi)(zhi)(zhi)(zhi)碳(tan)(tan)(tan)素結構鋼(gang)(gang)(gang)(gang)(gang)，對應(ying)日標(biao)S45C 美(mei)標(biao): 1045，德(de)標(biao) C45。其特征(zheng)是(shi)(shi)(shi)(shi)相比(bi)普(pu)通A3鋼(gang)(gang)(gang)(gang)(gang)，具(ju)有(you)(you)(you)更高(gao)(gao)(gao)(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)，抗變形能(neng)(neng)(neng)(neng)(neng)(neng)力。 化(hua)學成分元(yuan)素比(bi)例(%): 碳(tan)(tan)(tan)C:0.42~0.50; 鉻Cr:≤0.25; 錳Mn:0.50~0.80; 鎳Ni:≤0.25; 磷P:≤0.035; 硫S:≤0.035; 硅Si:0.17~0.37 機(ji)(ji)械性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng) σb\Mpa:≥600 σs\Mpa:≥355 δ5\%:≥16 ψ\%:≥40 硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)\HB:≤197 GB/T699-1999標(biao)準(zhun)規(gui)定(ding)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)45鋼(gang)(gang)(gang)(gang)(gang)熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li)制度(du)(du)(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)850℃正火(huo)(huo)(huo)(huo)(huo)(huo)(huo)、840℃淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)、600℃回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)，達(da)(da)(da)(da)到(dao)(dao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)為(wei)(wei)(wei)屈服強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)≥355MPa GB/T699-1999標(biao)準(zhun)規(gui)定(ding)45鋼(gang)(gang)(gang)(gang)(gang)抗拉強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)600MPa，屈服強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)355MPa，伸長率為(wei)(wei)(wei)16%，斷面(mian)收縮率為(wei)(wei)(wei)40%調(diao)(diao)(diao)(diao)制處(chu)理(li)(li)(li)(li)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)規(gui)格(ge)尺寸 45#(號(hao)(hao))鋼(gang)(gang)(gang)(gang)(gang)和(he)40Cr鋼(gang)(gang)(gang)(gang)(gang)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li)工(gong)(gong)(gong)(gong)藝(yi)(yi) 調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)是(shi)(shi)(shi)(shi)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)加(jia)高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)雙(shuang)重(zhong)熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li)，其目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)具(ju)有(you)(you)(you)良(liang)好(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)綜合(he)(he)機(ji)(ji)械性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)。 調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)(gang)有(you)(you)(you)碳(tan)(tan)(tan)素調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)(gang)和(he)合(he)(he)金(jin)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)(gang)二大類(lei)(lei)，不(bu)(bu)(bu)管(guan)是(shi)(shi)(shi)(shi)碳(tan)(tan)(tan)鋼(gang)(gang)(gang)(gang)(gang)還是(shi)(shi)(shi)(shi)合(he)(he)金(jin)鋼(gang)(gang)(gang)(gang)(gang)，其含(han)碳(tan)(tan)(tan)量(liang)控制比(bi)較嚴格(ge)。如(ru)果(guo)含(han)碳(tan)(tan)(tan)量(liang)過(guo)(guo)(guo)高(gao)(gao)(gao)(gao)(gao)，調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)后(hou)(hou)(hou)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)雖高(gao)(gao)(gao)(gao)(gao)，但(dan)(dan)韌性(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)夠，如(ru)含(han)碳(tan)(tan)(tan)量(liang)過(guo)(guo)(guo)低(di)(di)(di)，韌性(xing)(xing)(xing)(xing)(xing)提(ti)高(gao)(gao)(gao)(gao)(gao)而強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)不(bu)(bu)(bu)足(zu)(zu)。為(wei)(wei)(wei)使(shi)(shi)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)得到(dao)(dao)好(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)綜合(he)(he)性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)，一(yi)(yi)(yi)般含(han)碳(tan)(tan)(tan)量(liang)控制在(zai)(zai)(zai)(zai)0.30~0.50%。 調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)時(shi)(shi)(shi)(shi)，要求工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)整(zheng)個截(jie)面(mian)淬(cui)(cui)(cui)(cui)(cui)透，使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)得到(dao)(dao)以(yi)細針狀(zhuang)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)馬(ma)氏(shi)(shi)體(ti)為(wei)(wei)(wei)主的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)顯微(wei)組(zu)織(zhi)。通過(guo)(guo)(guo)高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)，得到(dao)(dao)以(yi)均勻回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)索氏(shi)(shi)體(ti)為(wei)(wei)(wei)主的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)顯微(wei)組(zu)織(zhi)。小(xiao)型(xing)工(gong)(gong)(gong)(gong)廠不(bu)(bu)(bu)可(ke)(ke)(ke)能(neng)(neng)(neng)(neng)(neng)(neng)每爐搞金(jin)相分析，一(yi)(yi)(yi)般只作(zuo)(zuo)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)測試，這就(jiu)(jiu)是(shi)(shi)(shi)(shi)說(shuo)(shuo)，淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)必(bi)須(xu)達(da)(da)(da)(da)到(dao)(dao)該材料(liao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)，回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)按圖(tu)要求來檢(jian)查。 工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)處(chu)理(li)(li)(li)(li)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)操(cao)(cao)(cao)作(zuo)(zuo)，必(bi)須(xu)嚴格(ge)按工(gong)(gong)(gong)(gong)藝(yi)(yi)文(wen)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)執行，我(wo)們只是(shi)(shi)(shi)(shi)對操(cao)(cao)(cao)作(zuo)(zuo)過(guo)(guo)(guo)程中如(ru)何(he)實施工(gong)(gong)(gong)(gong)藝(yi)(yi)提(ti)些(xie)看法。 1、 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi) 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)是(shi)(shi)(shi)(shi)中碳(tan)(tan)(tan)結構鋼(gang)(gang)(gang)(gang)(gang)，冷(leng)(leng)(leng)熱(re)(re)(re)(re)加(jia)工(gong)(gong)(gong)(gong)性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)都不(bu)(bu)(bu)錯，機(ji)(ji)械性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)較好(hao)(hao)，且價格(ge)低(di)(di)(di)、來源廣，所以(yi)應(ying)用(yong)(yong)廣泛(fan)。它(ta)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de) 弱點是(shi)(shi)(shi)(shi)淬(cui)(cui)(cui)(cui)(cui)透性(xing)(xing)(xing)(xing)(xing)低(di)(di)(di)，截(jie)面(mian)尺寸大和(he)要求比(bi)較高(gao)(gao)(gao)(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)不(bu)(bu)(bu)宜采用(yong)(yong)。 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)在(zai)(zai)(zai)(zai)A3+(30~50) ℃，在(zai)(zai)(zai)(zai)實際操(cao)(cao)(cao)作(zuo)(zuo)中，一(yi)(yi)(yi)般是(shi)(shi)(shi)(shi)取(qu)上(shang)限的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)。偏(pian)高(gao)(gao)(gao)(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)可(ke)(ke)(ke)以(yi)使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)加(jia)熱(re)(re)(re)(re)速度(du)(du)(du)(du)(du)(du)(du)(du)加(jia)快，表面(mian)氧化(hua)減少，且能(neng)(neng)(neng)(neng)(neng)(neng)提(ti)高(gao)(gao)(gao)(gao)(gao)工(gong)(gong)(gong)(gong)效(xiao)。為(wei)(wei)(wei)使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)奧氏(shi)(shi)體(ti)均勻化(hua)，就(jiu)(jiu)需要足(zu)(zu)夠的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)。如(ru)果(guo)實際裝爐量(liang)大，就(jiu)(jiu)需適當延(yan)長保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)。不(bu)(bu)(bu)然，可(ke)(ke)(ke)能(neng)(neng)(neng)(neng)(neng)(neng)會出(chu)現(xian)因(yin)(yin)(yin)加(jia)熱(re)(re)(re)(re)不(bu)(bu)(bu)均勻造(zao)成硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)不(bu)(bu)(bu)足(zu)(zu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)現(xian)象。但(dan)(dan)保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)過(guo)(guo)(guo)長，也(ye)會也(ye)出(chu)現(xian)晶粒粗(cu)大，氧化(hua)脫碳(tan)(tan)(tan)嚴重(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)弊病(bing)，影響淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)質(zhi)(zhi)(zhi)(zhi)(zhi)量(liang)。我(wo)們認(ren)為(wei)(wei)(wei)，如(ru)裝爐量(liang)大于(yu)(yu)(yu)(yu)(yu)工(gong)(gong)(gong)(gong)藝(yi)(yi)文(wen)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)規(gui)定(ding)，加(jia)熱(re)(re)(re)(re)保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)需延(yan)長1/5。 因(yin)(yin)(yin)為(wei)(wei)(wei)45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)淬(cui)(cui)(cui)(cui)(cui)透性(xing)(xing)(xing)(xing)(xing)低(di)(di)(di)，故應(ying)采用(yong)(yong)冷(leng)(leng)(leng)卻速度(du)(du)(du)(du)(du)(du)(du)(du)大的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)10%鹽水溶液。工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)入水后(hou)(hou)(hou)，應(ying)該淬(cui)(cui)(cui)(cui)(cui)透，但(dan)(dan)不(bu)(bu)(bu)是(shi)(shi)(shi)(shi)冷(leng)(leng)(leng)透，如(ru)果(guo)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)在(zai)(zai)(zai)(zai)鹽水中冷(leng)(leng)(leng)透，就(jiu)(jiu)有(you)(you)(you)可(ke)(ke)(ke)能(neng)(neng)(neng)(neng)(neng)(neng)使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)開裂(lie)，這是(shi)(shi)(shi)(shi)因(yin)(yin)(yin)為(wei)(wei)(wei)當工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)冷(leng)(leng)(leng)卻到(dao)(dao)180℃左右時(shi)(shi)(shi)(shi)，奧氏(shi)(shi)體(ti)迅速轉(zhuan)變為(wei)(wei)(wei)馬(ma)氏(shi)(shi)體(ti)造(zao)成過(guo)(guo)(guo)大的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)組(zu)織(zhi)應(ying)力所致。因(yin)(yin)(yin)此(ci)，當淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)快冷(leng)(leng)(leng)到(dao)(dao)該溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)區域，就(jiu)(jiu)應(ying)采取(qu)緩(huan)冷(leng)(leng)(leng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)方法。由于(yu)(yu)(yu)(yu)(yu)出(chu)水溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)難(nan)以(yi)掌(zhang)握，須(xu)憑(ping)經(jing)(jing)驗(yan)操(cao)(cao)(cao)作(zuo)(zuo)，當水中的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)抖動停(ting)止，即可(ke)(ke)(ke)出(chu)水空冷(leng)(leng)(leng)(如(ru)能(neng)(neng)(neng)(neng)(neng)(neng)油冷(leng)(leng)(leng)更好(hao)(hao))。另外，工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)入水宜動不(bu)(bu)(bu)宜靜，應(ying)按照(zhao)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)幾何(he)形狀(zhuang)，作(zuo)(zuo)規(gui)則運動。靜止的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)冷(leng)(leng)(leng)卻介(jie)質(zhi)(zhi)(zhi)(zhi)(zhi)加(jia)上(shang)靜止的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，導致硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)不(bu)(bu)(bu)均勻，應(ying)力不(bu)(bu)(bu)均勻而使(shi)(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)變形大，甚(shen)至開裂(lie)。 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)應(ying)該達(da)(da)(da)(da)到(dao)(dao)HRC56~59，截(jie)面(mian)大的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)可(ke)(ke)(ke)能(neng)(neng)(neng)(neng)(neng)(neng)性(xing)(xing)(xing)(xing)(xing)低(di)(di)(di)些(xie)，但(dan)(dan)不(bu)(bu)(bu)能(neng)(neng)(neng)(neng)(neng)(neng)低(di)(di)(di)于(yu)(yu)(yu)(yu)(yu)HRC48，不(bu)(bu)(bu)然，就(jiu)(jiu)說(shuo)(shuo)明工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)未(wei)得到(dao)(dao)完全(quan)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)，組(zu)織(zhi)中可(ke)(ke)(ke)能(neng)(neng)(neng)(neng)(neng)(neng)出(chu)現(xian)索氏(shi)(shi)體(ti)甚(shen)至鐵素體(ti)組(zu)織(zhi)，這種組(zu)織(zhi)通過(guo)(guo)(guo)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)，仍然保(bao)留(liu)在(zai)(zai)(zai)(zai)基體(ti)中，達(da)(da)(da)(da)不(bu)(bu)(bu)到(dao)(dao)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)。 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)高(gao)(gao)(gao)(gao)(gao)溫(wen)(wen)(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)，加(jia)熱(re)(re)(re)(re)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)通常(chang)為(wei)(wei)(wei)560~600℃，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求為(wei)(wei)(wei)HRC22~34。因(yin)(yin)(yin)為(wei)(wei)(wei)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)得到(dao)(dao)綜合(he)(he)機(ji)(ji)械性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)，所以(yi)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)范圍比(bi)較寬。但(dan)(dan)圖(tu)紙(zhi)有(you)(you)(you)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)，就(jiu)(jiu)要按圖(tu)紙(zhi)要求調(diao)(diao)(diao)(diao)整(zheng)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)，以(yi)保(bao)證硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)。如(ru)有(you)(you)(you)些(xie)軸類(lei)(lei)零(ling)(ling)(ling)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)要求強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)高(gao)(gao)(gao)(gao)(gao)，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求就(jiu)(jiu)高(gao)(gao)(gao)(gao)(gao);而有(you)(you)(you)些(xie)齒輪(lun)、帶(dai)鍵槽的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)軸類(lei)(lei)零(ling)(ling)(ling)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，因(yin)(yin)(yin)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)后(hou)(hou)(hou)還要進(jin)行銑、插加(jia)工(gong)(gong)(gong)(gong)，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求就(jiu)(jiu)低(di)(di)(di)些(xie)。關(guan)(guan)于(yu)(yu)(yu)(yu)(yu)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)，視硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求和(he)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)大小(xiao)而定(ding)，我(wo)們認(ren)為(wei)(wei)(wei)，回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)取(qu)決于(yu)(yu)(yu)(yu)(yu)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)，與回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)時(shi)(shi)(shi)(shi)間(jian)關(guan)(guan)系不(bu)(bu)(bu)大，但(dan)(dan)必(bi)須(xu)回(hui)(hui)透，一(yi)(yi)(yi)般工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)保(bao)溫(wen)(wen)(wen)(wen)時(shi)(shi)(shi)(shi)間(jian)總在(zai)(zai)(zai)(zai)一(yi)(yi)(yi)小(xiao)時(shi)(shi)(shi)(shi)以(yi)上(shang)。 具(ju)體(ti)應(ying)用(yong)(yong) 45號(hao)(hao)鋼(gang)(gang)(gang)(gang)(gang)廣泛(fan)應(ying)用(yong)(yong)于(yu)(yu)(yu)(yu)(yu)機(ji)(ji)械，未(wei)熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li)時(shi)(shi)(shi)(shi):HB≤229;熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li):正火(huo)(huo)(huo)(huo)(huo)(huo)(huo);沖擊(ji)功:Aku≥39J;強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)較高(gao)(gao)(gao)(gao)(gao)，塑性(xing)(xing)(xing)(xing)(xing)和(he)韌性(xing)(xing)(xing)(xing)(xing)尚好(hao)(hao)，45#鋼(gang)(gang)(gang)(gang)(gang)板(ban)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)后(hou)(hou)(hou)沒有(you)(you)(you)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)之前，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)大于(yu)(yu)(yu)(yu)(yu)HRC55( 可(ke)(ke)(ke)達(da)(da)(da)(da)HRC62)為(wei)(wei)(wei)合(he)(he)格(ge)經(jing)(jing)過(guo)(guo)(guo)熱(re)(re)(re)(re)處(chu)理(li)(li)(li)(li)，再(zai)回(hui)(hui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)可(ke)(ke)(ke)以(yi)達(da)(da)(da)(da)到(dao)(dao)HRC42-46，這樣既能(neng)(neng)(neng)(neng)(neng)(neng)保(bao)證它(ta)良(liang)好(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)機(ji)(ji)械性(xing)(xing)(xing)(xing)(xing)能(neng)(neng)(neng)(neng)(neng)(neng)，又能(neng)(neng)(neng)(neng)(neng)(neng)得到(dao)(dao)表面(mian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)(du)(du)要求，用(yong)(yong)于(yu)(yu)(yu)(yu)(yu)制作(zuo)(zuo)承受負(fu)荷(he)較大的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)小(xiao)截(jie)面(mian)調(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)和(he)應(ying)力較小(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大型(xing)正火(huo)(huo)(huo)(huo)(huo)(huo)(huo)零(ling)(ling)(ling)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，以(yi)及對心部強(qiang)度(du)(du)(du)(du)(du)(du)(du)(du)要求不(bu)(bu)(bu)高(gao)(gao)(gao)(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)表面(mian)淬(cui)(cui)(cui)(cui)(cui)火(huo)(huo)(huo)(huo)(huo)(huo)(huo)零(ling)(ling)(ling)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，如(ru)梢子導柱，表針等部件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)。 Q235/Q345/45#特厚(hou)鋼(gang)(gang)(gang)(gang)(gang)板(ban)

公(gong)司實力

45#是(shi)(shi)鋼(gang)(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)牌號(hao)(hao)(hao)(hao)是(shi)(shi)一(yi)(yi)種(zhong)優質(zhi)(zhi)(zhi)(zhi)碳(tan)(tan)素(su)結(jie)構鋼(gang)(gang)(gang)(gang)，對(dui)應(ying)(ying)(ying)日標(biao)S45C 美(mei)標(biao): 1045，德標(biao) C45。其特征是(shi)(shi)相比普通A3鋼(gang)(gang)(gang)(gang)，具(ju)(ju)有(you)(you)更高(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)，抗(kang)變形能(neng)(neng)力。 化學成(cheng)分(fen)元素(su)比例(%): 碳(tan)(tan)C:0.42~0.50; 鉻Cr:≤0.25; 錳Mn:0.50~0.80; 鎳Ni:≤0.25; 磷P:≤0.035; 硫S:≤0.035; 硅Si:0.17~0.37 機(ji)械性(xing)(xing)能(neng)(neng) σb\Mpa:≥600 σs\Mpa:≥355 δ5\%:≥16 ψ\%:≥40 硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)\HB:≤197 GB/T699-1999標(biao)準規(gui)(gui)定(ding)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)45鋼(gang)(gang)(gang)(gang)熱(re)(re)(re)處理(li)(li)(li)制度(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)(wei)850℃正(zheng)火(huo)(huo)(huo)(huo)、840℃淬(cui)(cui)火(huo)(huo)(huo)(huo)、600℃回(hui)(hui)火(huo)(huo)(huo)(huo)，達(da)到(dao)(dao)(dao)(dao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)為(wei)(wei)(wei)(wei)屈服強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)≥355MPa GB/T699-1999標(biao)準規(gui)(gui)定(ding)45鋼(gang)(gang)(gang)(gang)抗(kang)拉強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)(wei)600MPa，屈服強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)為(wei)(wei)(wei)(wei)355MPa，伸長(chang)率(lv)(lv)為(wei)(wei)(wei)(wei)16%，斷面(mian)收縮率(lv)(lv)為(wei)(wei)(wei)(wei)40%調(diao)(diao)(diao)(diao)(diao)(diao)(diao)制處理(li)(li)(li)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)規(gui)(gui)格(ge)尺寸 45#(號(hao)(hao)(hao)(hao))鋼(gang)(gang)(gang)(gang)和(he)(he)40Cr鋼(gang)(gang)(gang)(gang)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)熱(re)(re)(re)處理(li)(li)(li)工(gong)(gong)(gong)(gong)(gong)(gong)藝 調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)是(shi)(shi)淬(cui)(cui)火(huo)(huo)(huo)(huo)加(jia)高(gao)(gao)溫(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)雙重(zhong)熱(re)(re)(re)處理(li)(li)(li)，其目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)具(ju)(ju)有(you)(you)良好(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)綜(zong)(zong)合(he)機(ji)械性(xing)(xing)能(neng)(neng)。 調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)有(you)(you)碳(tan)(tan)素(su)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)和(he)(he)合(he)金調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)(gang)二(er)大(da)類(lei)，不(bu)管(guan)是(shi)(shi)碳(tan)(tan)鋼(gang)(gang)(gang)(gang)還(huan)是(shi)(shi)合(he)金鋼(gang)(gang)(gang)(gang)，其含(han)碳(tan)(tan)量控(kong)(kong)制比較(jiao)嚴格(ge)。如果(guo)含(han)碳(tan)(tan)量過(guo)高(gao)(gao)，調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)后工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)雖高(gao)(gao)，但韌性(xing)(xing)不(bu)夠，如含(han)碳(tan)(tan)量過(guo)低，韌性(xing)(xing)提高(gao)(gao)而(er)強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)不(bu)足。為(wei)(wei)(wei)(wei)使(shi)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)得(de)(de)到(dao)(dao)(dao)(dao)好(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)綜(zong)(zong)合(he)性(xing)(xing)能(neng)(neng)，一(yi)(yi)般含(han)碳(tan)(tan)量控(kong)(kong)制在(zai)(zai)0.30~0.50%。 調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)淬(cui)(cui)火(huo)(huo)(huo)(huo)時(shi)(shi)，要(yao)(yao)(yao)(yao)求(qiu)(qiu)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)整個截面(mian)淬(cui)(cui)透(tou)(tou)，使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)得(de)(de)到(dao)(dao)(dao)(dao)以細針狀(zhuang)淬(cui)(cui)火(huo)(huo)(huo)(huo)馬(ma)氏(shi)體為(wei)(wei)(wei)(wei)主的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)顯微(wei)組(zu)織(zhi)(zhi)。通過(guo)高(gao)(gao)溫(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)，得(de)(de)到(dao)(dao)(dao)(dao)以均(jun)勻回(hui)(hui)火(huo)(huo)(huo)(huo)索氏(shi)體為(wei)(wei)(wei)(wei)主的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)顯微(wei)組(zu)織(zhi)(zhi)。小(xiao)型(xing)工(gong)(gong)(gong)(gong)(gong)(gong)廠不(bu)可能(neng)(neng)每爐搞金相分(fen)析，一(yi)(yi)般只作硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)測(ce)試(shi)，這(zhe)就(jiu)(jiu)是(shi)(shi)說，淬(cui)(cui)火(huo)(huo)(huo)(huo)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)必須(xu)達(da)到(dao)(dao)(dao)(dao)該(gai)材料的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)淬(cui)(cui)火(huo)(huo)(huo)(huo)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)，回(hui)(hui)火(huo)(huo)(huo)(huo)后硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)按(an)圖要(yao)(yao)(yao)(yao)求(qiu)(qiu)來檢查(cha)。 工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)處理(li)(li)(li)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)操(cao)作，必須(xu)嚴格(ge)按(an)工(gong)(gong)(gong)(gong)(gong)(gong)藝文件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)執(zhi)行，我(wo)們(men)只是(shi)(shi)對(dui)操(cao)作過(guo)程中如何(he)實(shi)施工(gong)(gong)(gong)(gong)(gong)(gong)藝提些(xie)(xie)看法。 1、 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi) 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)是(shi)(shi)中碳(tan)(tan)結(jie)構鋼(gang)(gang)(gang)(gang)，冷(leng)(leng)(leng)熱(re)(re)(re)加(jia)工(gong)(gong)(gong)(gong)(gong)(gong)性(xing)(xing)能(neng)(neng)都不(bu)錯，機(ji)械性(xing)(xing)能(neng)(neng)較(jiao)好(hao)，且價格(ge)低、來源廣(guang)，所(suo)以應(ying)(ying)(ying)用(yong)廣(guang)泛。它的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de) 弱點是(shi)(shi)淬(cui)(cui)透(tou)(tou)性(xing)(xing)低，截面(mian)尺寸大(da)和(he)(he)要(yao)(yao)(yao)(yao)求(qiu)(qiu)比較(jiao)高(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)不(bu)宜(yi)(yi)采用(yong)。 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)淬(cui)(cui)火(huo)(huo)(huo)(huo)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)在(zai)(zai)A3+(30~50) ℃，在(zai)(zai)實(shi)際操(cao)作中，一(yi)(yi)般是(shi)(shi)取上限的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)。偏高(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)淬(cui)(cui)火(huo)(huo)(huo)(huo)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)可以使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)加(jia)熱(re)(re)(re)速度(du)(du)(du)(du)(du)(du)加(jia)快，表(biao)面(mian)氧化減少，且能(neng)(neng)提高(gao)(gao)工(gong)(gong)(gong)(gong)(gong)(gong)效。為(wei)(wei)(wei)(wei)使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)奧氏(shi)體均(jun)勻化，就(jiu)(jiu)需要(yao)(yao)(yao)(yao)足夠的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)保(bao)溫(wen)(wen)時(shi)(shi)間(jian)。如果(guo)實(shi)際裝爐量大(da)，就(jiu)(jiu)需適當(dang)延長(chang)保(bao)溫(wen)(wen)時(shi)(shi)間(jian)。不(bu)然，可能(neng)(neng)會出(chu)(chu)現因(yin)加(jia)熱(re)(re)(re)不(bu)均(jun)勻造(zao)成(cheng)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)不(bu)足的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)現象。但保(bao)溫(wen)(wen)時(shi)(shi)間(jian)過(guo)長(chang)，也(ye)會也(ye)出(chu)(chu)現晶粒粗大(da)，氧化脫(tuo)碳(tan)(tan)嚴重(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)弊(bi)病(bing)，影響淬(cui)(cui)火(huo)(huo)(huo)(huo)質(zhi)(zhi)(zhi)(zhi)量。我(wo)們(men)認為(wei)(wei)(wei)(wei)，如裝爐量大(da)于(yu)(yu)(yu)工(gong)(gong)(gong)(gong)(gong)(gong)藝文件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)規(gui)(gui)定(ding)，加(jia)熱(re)(re)(re)保(bao)溫(wen)(wen)時(shi)(shi)間(jian)需延長(chang)1/5。 因(yin)為(wei)(wei)(wei)(wei)45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)淬(cui)(cui)透(tou)(tou)性(xing)(xing)低，故應(ying)(ying)(ying)采用(yong)冷(leng)(leng)(leng)卻(que)速度(du)(du)(du)(du)(du)(du)大(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)10%鹽(yan)水(shui)溶液。工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)入水(shui)后，應(ying)(ying)(ying)該(gai)淬(cui)(cui)透(tou)(tou)，但不(bu)是(shi)(shi)冷(leng)(leng)(leng)透(tou)(tou)，如果(guo)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)在(zai)(zai)鹽(yan)水(shui)中冷(leng)(leng)(leng)透(tou)(tou)，就(jiu)(jiu)有(you)(you)可能(neng)(neng)使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)開裂，這(zhe)是(shi)(shi)因(yin)為(wei)(wei)(wei)(wei)當(dang)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)冷(leng)(leng)(leng)卻(que)到(dao)(dao)(dao)(dao)180℃左(zuo)右時(shi)(shi)，奧氏(shi)體迅速轉變為(wei)(wei)(wei)(wei)馬(ma)氏(shi)體造(zao)成(cheng)過(guo)大(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)組(zu)織(zhi)(zhi)應(ying)(ying)(ying)力所(suo)致(zhi)。因(yin)此，當(dang)淬(cui)(cui)火(huo)(huo)(huo)(huo)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)快冷(leng)(leng)(leng)到(dao)(dao)(dao)(dao)該(gai)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)區域，就(jiu)(jiu)應(ying)(ying)(ying)采取緩冷(leng)(leng)(leng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)方法。由于(yu)(yu)(yu)出(chu)(chu)水(shui)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)難以掌握(wo)，須(xu)憑經(jing)驗操(cao)作，當(dang)水(shui)中的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)抖動停(ting)止(zhi)，即(ji)可出(chu)(chu)水(shui)空冷(leng)(leng)(leng)(如能(neng)(neng)油冷(leng)(leng)(leng)更好(hao))。另外，工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)入水(shui)宜(yi)(yi)動不(bu)宜(yi)(yi)靜，應(ying)(ying)(ying)按(an)照工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)幾何(he)形狀(zhuang)，作規(gui)(gui)則運動。靜止(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)冷(leng)(leng)(leng)卻(que)介質(zhi)(zhi)(zhi)(zhi)加(jia)上靜止(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，導致(zhi)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)不(bu)均(jun)勻，應(ying)(ying)(ying)力不(bu)均(jun)勻而(er)使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)變形大(da)，甚(shen)至開裂。 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)淬(cui)(cui)火(huo)(huo)(huo)(huo)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)應(ying)(ying)(ying)該(gai)達(da)到(dao)(dao)(dao)(dao)HRC56~59，截面(mian)大(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)可能(neng)(neng)性(xing)(xing)低些(xie)(xie)，但不(bu)能(neng)(neng)低于(yu)(yu)(yu)HRC48，不(bu)然，就(jiu)(jiu)說明(ming)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)未得(de)(de)到(dao)(dao)(dao)(dao)完全(quan)淬(cui)(cui)火(huo)(huo)(huo)(huo)，組(zu)織(zhi)(zhi)中可能(neng)(neng)出(chu)(chu)現索氏(shi)體甚(shen)至鐵素(su)體組(zu)織(zhi)(zhi)，這(zhe)種(zhong)組(zu)織(zhi)(zhi)通過(guo)回(hui)(hui)火(huo)(huo)(huo)(huo)，仍然保(bao)留在(zai)(zai)基體中，達(da)不(bu)到(dao)(dao)(dao)(dao)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)。 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)淬(cui)(cui)火(huo)(huo)(huo)(huo)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)高(gao)(gao)溫(wen)(wen)回(hui)(hui)火(huo)(huo)(huo)(huo)，加(jia)熱(re)(re)(re)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)通常為(wei)(wei)(wei)(wei)560~600℃，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)為(wei)(wei)(wei)(wei)HRC22~34。因(yin)為(wei)(wei)(wei)(wei)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)得(de)(de)到(dao)(dao)(dao)(dao)綜(zong)(zong)合(he)機(ji)械性(xing)(xing)能(neng)(neng)，所(suo)以硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)范圍比較(jiao)寬。但圖紙有(you)(you)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)，就(jiu)(jiu)要(yao)(yao)(yao)(yao)按(an)圖紙要(yao)(yao)(yao)(yao)求(qiu)(qiu)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)整回(hui)(hui)火(huo)(huo)(huo)(huo)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)，以保(bao)證硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)。如有(you)(you)些(xie)(xie)軸類(lei)零件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)要(yao)(yao)(yao)(yao)求(qiu)(qiu)強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)高(gao)(gao)，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)就(jiu)(jiu)高(gao)(gao);而(er)有(you)(you)些(xie)(xie)齒輪(lun)、帶鍵槽(cao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)軸類(lei)零件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，因(yin)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)后還(huan)要(yao)(yao)(yao)(yao)進行銑(xian)、插加(jia)工(gong)(gong)(gong)(gong)(gong)(gong)，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)就(jiu)(jiu)低些(xie)(xie)。關(guan)于(yu)(yu)(yu)回(hui)(hui)火(huo)(huo)(huo)(huo)保(bao)溫(wen)(wen)時(shi)(shi)間(jian)，視硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)和(he)(he)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)大(da)小(xiao)而(er)定(ding)，我(wo)們(men)認為(wei)(wei)(wei)(wei)，回(hui)(hui)火(huo)(huo)(huo)(huo)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)取決于(yu)(yu)(yu)回(hui)(hui)火(huo)(huo)(huo)(huo)溫(wen)(wen)度(du)(du)(du)(du)(du)(du)，與回(hui)(hui)火(huo)(huo)(huo)(huo)時(shi)(shi)間(jian)關(guan)系不(bu)大(da)，但必須(xu)回(hui)(hui)透(tou)(tou)，一(yi)(yi)般工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)回(hui)(hui)火(huo)(huo)(huo)(huo)保(bao)溫(wen)(wen)時(shi)(shi)間(jian)總在(zai)(zai)一(yi)(yi)小(xiao)時(shi)(shi)以上。 具(ju)(ju)體應(ying)(ying)(ying)用(yong) 45號(hao)(hao)(hao)(hao)鋼(gang)(gang)(gang)(gang)廣(guang)泛應(ying)(ying)(ying)用(yong)于(yu)(yu)(yu)機(ji)械，未熱(re)(re)(re)處理(li)(li)(li)時(shi)(shi):HB≤229;熱(re)(re)(re)處理(li)(li)(li):正(zheng)火(huo)(huo)(huo)(huo);沖擊功:Aku≥39J;強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)較(jiao)高(gao)(gao)，塑性(xing)(xing)和(he)(he)韌性(xing)(xing)尚好(hao)，45#鋼(gang)(gang)(gang)(gang)板(ban)淬(cui)(cui)火(huo)(huo)(huo)(huo)后沒有(you)(you)回(hui)(hui)火(huo)(huo)(huo)(huo)之前，硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)大(da)于(yu)(yu)(yu)HRC55( 可達(da)HRC62)為(wei)(wei)(wei)(wei)合(he)格(ge)經(jing)過(guo)熱(re)(re)(re)處理(li)(li)(li)，再回(hui)(hui)火(huo)(huo)(huo)(huo)可以達(da)到(dao)(dao)(dao)(dao)HRC42-46，這(zhe)樣既能(neng)(neng)保(bao)證它良好(hao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)機(ji)械性(xing)(xing)能(neng)(neng)，又能(neng)(neng)得(de)(de)到(dao)(dao)(dao)(dao)表(biao)面(mian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)硬(ying)(ying)(ying)(ying)(ying)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)，用(yong)于(yu)(yu)(yu)制作承受負荷較(jiao)大(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)小(xiao)截面(mian)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)質(zhi)(zhi)(zhi)(zhi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)和(he)(he)應(ying)(ying)(ying)力較(jiao)小(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)型(xing)正(zheng)火(huo)(huo)(huo)(huo)零件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，以及對(dui)心部強(qiang)(qiang)度(du)(du)(du)(du)(du)(du)要(yao)(yao)(yao)(yao)求(qiu)(qiu)不(bu)高(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)表(biao)面(mian)淬(cui)(cui)火(huo)(huo)(huo)(huo)零件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)，如梢子導柱，表(biao)針等部件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(jian)。 Q235/Q345/45#特厚鋼(gang)(gang)(gang)(gang)板(ban)