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42CRMO合金圓鋼-合金結(jié)構(gòu)鋼
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42CrMo4等。其主要化學(xué)成分為碳（0.38～0.45%）、鉻（0.90～1.20%）、鉬（0.15～0.25%），并含有錳、硅等元素，硫、磷含量較低。該材料具有高強(qiáng)度、高韌性及良好淬透性，抗拉強(qiáng)度≥1080MPa，硬度≤217HB，適用于建筑、機(jī)械工程、汽車(chē)制造及航空航天等領(lǐng)域的結(jié)構(gòu)件與關(guān)鍵部件。通過(guò)調(diào)質(zhì)處理、鹽浴滲釩等工藝可實(shí)現(xiàn)性能優(yōu)化，淬火后硬度可達(dá)50-52HRC，滲釩處理可增強(qiáng)表面耐磨性及抗沖擊能力。其熱加工規(guī)范包括1150～1200℃加熱及多階段鍛造，適用于制造承受重載荷、沖擊或低溫環(huán)境的大中型塑料模具、齒輪及傳動(dòng)軸等部件。相較于同類(lèi)鋼種40Cr，其綜合機(jī)械性能更優(yōu)。中文名42鉻鉬外文名42CrMo別 名42CrMo4執(zhí)行標(biāo)準(zhǔn)國(guó)標(biāo)GB產(chǎn) 地中國(guó)分 類(lèi)合金結(jié)構(gòu)鋼等 級(jí)優(yōu)等品規(guī) 格板材、圓棒目錄1產(chǎn)品簡(jiǎn)介2化學(xué)成份3力學(xué)性能4鹽浴滲釩處理542CrMo回火642CrMo淬火7對(duì)應(yīng)牌號(hào)8淬火規(guī)范9物理性能10工藝規(guī)范11典型應(yīng)用舉例產(chǎn)品簡(jiǎn)介播報(bào)編輯42CrMo鋼材屬于超高強(qiáng)度鋼，具有高強(qiáng)度和韌性，淬透性也較好，無(wú)明顯的回火脆性，調(diào)質(zhì)處理后有較高的疲勞極限和抗多次沖擊能力，低溫沖擊韌性良好。42CrMo鋼材適宜制造要求一定強(qiáng)度和韌性的大、中型塑料模具。化學(xué)成份播報(bào)編輯碳 C ：0.38～0.45%硅 Si：0.17～0.37%錳 Mn：0.50～0.80%硫 S ：允許殘余含量≤0.035%磷 P ：允許殘余含量≤0.035%鉻 Cr：0.90～1.20%鎳 Ni：允許殘余含量≤0.30%銅 Cu：允許殘余含量≤0.30%42CrMo鋼材鉬 Mo：0.15～0.25%力學(xué)性能播報(bào)編輯硬度 ：退火,147~241HB42CrMo力學(xué)性能：抗拉強(qiáng)度σb (MPa)：≥1080(110)屈服強(qiáng)度 σs (MPa)：≥930(95)伸長(zhǎng)率 δ5 (%)：≥12斷面收縮率ψ (%)：≥45沖擊功 Akv (J)：≥63沖擊韌性值 αkv (J/cm2)：≥78(8)硬度 ：≤217HB為提高模具壽命達(dá)到80萬(wàn)模次以上，可對(duì)預(yù)硬鋼實(shí)施淬火加低溫回火的加硬方式來(lái)實(shí)現(xiàn)。淬火時(shí)先在500-600℃預(yù)熱2-4小時(shí)，然后在850-880℃保溫一定時(shí)間（至少2小時(shí)），放入油中冷卻至50-100℃出油空冷，淬火后硬度可達(dá)50-52HRC，為防止開(kāi)裂應(yīng)立即進(jìn)行200℃低溫回火處理，回火后，硬度可保持48HRC以上。鹽浴滲釩處理播報(bào)編輯42CrMo鋼材的中性鹽浴滲釩處理工藝，42CrMo鋼材經(jīng)中性鹽浴滲釩處理可獲得碳化物滲層。一、碳釩化合物，該滲層組織均勻，具有良好的連續(xù)性和致密性，厚度均勻,結(jié)構(gòu)致密，具有很高的顯微硬度和較高的耐磨性，表面硬度、耐磨性及抗粘著性等性能大幅度提高。二、VC在奧氏體中的溶解度比它在鐵素體中的溶解度高，隨著溫度的降低，VC從鐵素體中析出，使合金強(qiáng)化及晶粒細(xì)化，化合物層表現(xiàn)出較高的硬度。 42CrMo鋼材屬于高碳高鉻萊氏體鋼, 碳化物含量高,約占20 % ,且常呈帶狀或網(wǎng)狀不均勻分布,偏析嚴(yán)重, 而常規(guī)熱處理又很難改變碳化物偏析的狀況, 嚴(yán)重影響了鋼的力學(xué)性能與模具的使用壽命。而碳化物的形狀、大小對(duì)鋼的性能也有很大的影響, 尤其大塊狀尖角碳化物對(duì)鋼基體的割裂作用比較大,往往成為疲勞斷裂的策源地,為此必須對(duì)原材料軋制鋼材進(jìn)行改鍛,充分擊碎共晶碳化物,使之呈細(xì)小、均勻分布, 纖維組織圍繞型腔或無(wú)定向分布, 從而改善鋼材的橫向力學(xué)性能。鍛造時(shí)對(duì)鋼坯從不同方向進(jìn)行多次鐓粗和拉拔,并采用“二輕一重”法鍛造,即坯料始鍛時(shí)要輕擊,防止斷裂,在980～1 020 ℃中間溫度可重?fù)? 以保證擊碎碳化物, 42CrMo鋼材未改鍛,采用固溶雙細(xì)化處理 ,即500 ℃及800 ℃左右二級(jí)預(yù)熱,1 100～1 150 ℃固溶處理,淬入熱油或等溫淬火,750 ℃高溫回火,機(jī)加工后960 ℃加熱油冷后進(jìn)行最終熱處理, 也可使碳化物細(xì)化、棱角圓整化,晶粒細(xì)化。42CrMo回火播報(bào)編輯42CrMo鋼材推薦的回火規(guī)范42CrMo鋼材方案淬火溫度 /℃回 火---用 途加熱溫度/℃介質(zhì)硬度HB--ⅠⅡⅢ1020~1040消除應(yīng)力去除應(yīng)力，降低硬度去除應(yīng)力，降低硬度150~170200~275400~425油或硝鹽——61~6357~5955~57ⅣⅤⅥ1115~1130去除應(yīng)力及形成二次硬化去除應(yīng)力及形成二次硬化去除應(yīng)力及形成二次硬化510~520℃多次回火-78℃冷處理加510~520℃一次回火-78℃冷處理加一次510~520℃回火，再-78℃冷處理———60~6160~6161~642CrMo淬火播報(bào)編輯42CrMo鋼材方案第一次預(yù)熱/℃第二次預(yù)熱/℃淬火溫度/℃冷 卻介質(zhì)溫度/℃在介質(zhì)中冷卻介質(zhì)硬度（HRC）ⅠⅡⅢⅣⅤ550~660840~860950~10001020~10401020~10401115~11301115~1130油油熔融硝鹽油熔融硝鹽20~6020~60400~55020~60400~450至室溫至油溫5~10min至油溫5~10min空冷空冷空冷空冷空冷58~6262~6362~6342~5042~50對(duì)應(yīng)牌號(hào)播報(bào)編輯俄羅斯ГOCT 38XM、美國(guó)AISI 4140/4142、英國(guó)BS 708M40/708A42/709M40、法國(guó)NF 40CD4/42CD4、德國(guó)DIN 41CrMo4/42CrMo4、日本JIS SCM4、國(guó)際ISO 683/1 3淬火規(guī)范播報(bào)編輯普通淬火、回火規(guī)范： 淬火溫度1000~1050℃，淬油或淬氣，硬度≥ 60HRC；回火溫度160~180℃，回火時(shí)間2h，或回火溫度325~375℃，回火次數(shù)2~3次。物理性能播報(bào)編輯(1)臨界點(diǎn)溫度(近似值)：Ac1=730°C、Ac3=800°C、Ms=310°C。(2)線脹系數(shù):溫度20~100°C/20~200°C/20~300°C /20 ~400°C/20~500°C /20~600°C, 線脹系數(shù): 11.1×10K/12.1×10K/12.9×10K/13.5×10K/13.9×10K14.1×10K。(3)彈性模量:溫度20°C/300°C/400°C/500°C/600°C, 彈性模量210000MPa/185000MPa/ 175000MPa/165000MPa/15500oMPa工藝規(guī)范播報(bào)編輯熱加工規(guī)范加熱溫度1150 ~1200°C,開(kāi)始溫度1130 ~1180°C,終止溫度＞850°C,φ＞50mm時(shí),緩冷。正火規(guī)范正火溫度850~900°C,出爐空冷。高溫回火規(guī)范回火溫度680~700°C,出爐空冷。淬火、回火規(guī)范預(yù)熱溫度680 ~700°C,淬火溫度840~880°C,油冷,回火溫度580°C,水冷或油冷,硬度≤217HBW。亞溫淬火強(qiáng)韌化處理規(guī)范淬火溫度900°C,回火溫度560°C,硬度(37±1) HRC感應(yīng)淬火、回火規(guī)范淬火溫度900°C,回火溫度150~180°C,硬度54 ~60HRC。典型應(yīng)用舉例播報(bào)編輯適宜制作要求一定強(qiáng)度和韌性的大中型塑料模具。新手上路成長(zhǎng)任務(wù)編輯入門(mén)編輯規(guī)則本人編輯我有疑問(wèn)內(nèi)容質(zhì)疑在線客服官方貼吧意見(jiàn)反饋投訴建議舉報(bào)不良信息未通過(guò)詞條申訴投訴侵權(quán)信息封禁查詢(xún)與解封?2025?Baidu?使用百度前必讀?|?百科協(xié)議?|?隱私政策?|?百度百科合作平臺(tái)?|?京ICP證030173號(hào)?京公網(wǎng)安備11000002000001號(hào)window.PAGE_DATA= 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