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.index-module_taskLogo__71Tj5{height:66px;position:absolute;right:30px;top:0;width:66px}.index-module_drawerHand__aRhcO.index-module_open__qMl5O{right:480px}.index-module_reverse__OKr6k{transform:rotate(180deg)}網(wǎng)頁(yè)新聞貼吧知道網(wǎng)盤(pán)圖片視頻地圖文庫(kù)資訊采購(gòu)百科百度首頁(yè)登錄注冊(cè)進(jìn)入詞條全站搜索幫助首頁(yè)秒懂百科特色百科知識(shí)專(zhuān)題加入百科百科團(tuán)隊(duì)權(quán)威合作個(gè)人中心收藏查看我的收藏0有用+1050Cr播報(bào)討論上傳視頻一種合金結(jié)構(gòu)鋼50Cr，是一種合金結(jié)構(gòu)鋼。統(tǒng)一數(shù)字代號(hào)：A2050250Cr是一種合金結(jié)構(gòu)鋼。主要用來(lái)制造較重要的零件，也可經(jīng)高頻表面淬火后作承載及耐磨性要求較高的各種零件，如齒輪，套筒、軸、銷(xiāo)子等。外文名50Cr類(lèi) 型合金結(jié)構(gòu)鋼統(tǒng)一數(shù)字代號(hào)A20502標(biāo) 準(zhǔn)GB/T 3077-1999目錄1基本信息2化學(xué)成分3力學(xué)性能450cr介紹5標(biāo)準(zhǔn)及表示方法6合金鋼牌號(hào)基本信息播報(bào)編輯50Cr，合金結(jié)構(gòu)鋼。統(tǒng)一數(shù)字代號(hào)：A20502 標(biāo)準(zhǔn)：GB/T 3077-1999化學(xué)成分播報(bào)編輯【化學(xué)成分】（質(zhì)量分?jǐn)?shù)）（%）碳 C ：0.47～0.54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：0.80～1.10鎳 Ni：允許殘余含量≤0.030銅 Cu：允許殘余含量≤0.030力學(xué)性能播報(bào)編輯【力學(xué)性能】試樣毛坯尺寸（mm）：25熱處理：第一次淬火加熱溫度（℃）：830；冷卻劑：油第二次淬火加熱溫度（℃）：-回火加熱溫度（℃）：520；冷卻劑：水、油抗拉強(qiáng)度 σb (MPa)：≥1080(110)屈服強(qiáng)度 σs (MPa)：≥930(95)伸長(zhǎng)率 δ5 (%)：≥9斷面收縮率 ψ (%)：≥40沖擊功 Akv (J)：≥39沖擊韌性值 αkv (J/cm2)：≥49(5)布氏硬度（HBS100/3000）（退火或高溫回火狀態(tài)）：≤229交貨狀態(tài)：以熱處理（正火、退火或高溫回火）或不熱處理狀態(tài)交貨，交貨狀態(tài)應(yīng)在合同中注明。50cr介紹播報(bào)編輯【主要特性】此鋼淬透性好，在油中臨界淬透直徑達(dá)14～49mm，在水中臨界淬透直徑達(dá)28～77mm，在油中淬火與回火后能獲得很高的強(qiáng)度及硬度，但水淬時(shí)有形成裂紋的傾向；在500～650℃范圍回火時(shí)存在第二類(lèi)回火脆性?xún)A向；熱加工時(shí)有白點(diǎn)敏感性。 此鋼正火或調(diào)質(zhì)后可切削性良好，退火后的可切削性也較好；鋼在冷變形時(shí)塑性低，焊接性不好，有形成裂紋的傾向，所以在焊前需預(yù)熱至200℃左右，而焊后要進(jìn)行消除應(yīng)力處理?！緫?yīng)用舉例】這種鋼通常是在淬火及回火或調(diào)質(zhì)狀態(tài)下使用，用以制造受重負(fù)荷及摩擦的零件，如熱軋用直徑在600mm以下的軋輥、減速器軸、齒輪、傳動(dòng)軸、止推環(huán)、支承輥的心軸、拖拉機(jī)離合器齒輪、柴油機(jī)的連桿、螺栓、挺桿和重型礦山機(jī)械要求高強(qiáng)度與耐磨的齒輪、油膜軸承套等。在某些情況下，也用來(lái)制造要求表面很高硬度及耐磨性的高頻表面淬火件。此外，這種鋼還可用作中等彈性的彈簧。標(biāo)準(zhǔn)及表示方法播報(bào)編輯① 鋼號(hào)開(kāi)頭的兩位數(shù)字表示鋼的碳含量，以平均碳含量的萬(wàn)分之幾表示，如40Cr、50Cr合金管②鋼中主要合金元素，除個(gè)別微合金元素外，一般以百分之幾表示。當(dāng)平均合金含量＜1.5%時(shí)，鋼號(hào)中一般只標(biāo)出元素符號(hào)，而不標(biāo)明含量，但在特殊情況下易致混淆者，在元素符號(hào)后亦可標(biāo)以數(shù)字"1"，例如鋼號(hào)"12CrMoV"和"12Cr1MoV"，前者鉻含量為0.4-0.6%，后者為0.9-1.2%，其余成分全部相同。當(dāng)合金元素平均含量≥1.5%、≥2.5%、≥3.5%……時(shí)，在元素符號(hào)后面應(yīng)標(biāo)明含量，可相應(yīng)表示為2、3、4……等。例如18Cr2Ni4WA。③鋼中的釩V、鈦Ti、鋁AL、硼B(yǎng)、稀土RE等合金元素，均屬微合金元素，雖然含量很低，仍應(yīng)在鋼號(hào)中標(biāo)出。例如20MnVB鋼中。釩為0.07-0.12%，硼為0.001-0.005%。④高級(jí)優(yōu)質(zhì)鋼應(yīng)在鋼號(hào)最后加"A"，以區(qū)別于一般優(yōu)質(zhì)鋼。⑤專(zhuān)門(mén)用途的合金結(jié)構(gòu)鋼，鋼號(hào)冠以（或后綴）代表該鋼種用途的符號(hào)。例如鉚螺專(zhuān)用的30CrMnSi鋼，鋼號(hào)表示為ML30CrMnSi。合金管與無(wú)縫管兩者既有關(guān)系又有區(qū)別，不能混為一談。合金管是鋼管按照生產(chǎn)用料（也就是材質(zhì)）來(lái)定義的，顧名思義就是合金做的管子；而無(wú)縫管是鋼管按照生產(chǎn)工藝（有縫無(wú)縫）來(lái)定義的，區(qū)別于無(wú)縫管的就是有縫管，包括直縫焊管和螺旋管。50Cr合金鋼牌號(hào)播報(bào)編輯20Mn2、30Mn2、35Mn2、40Mn2、45Mn2、50Mn2、20MnV、27MnSi、35MnSi、42MnSi、20SiMn 2Mo、25SiMn2MoV、37SiMn2MoV、40B、45B、50B、40MnB、45MnB、20MnMoB、15MnVB、20MnV B、40MnVB、20MnTiB、25MnTiBRE、15Cr、15CrA、20Cr、30Cr、35Cr、40Cr、45Cr、50Cr、38CrSi、12CrMo、15CrMo、20CrMo、30CrMo、30CrMoA、35CrMo、42CrMo、12CrMoV、35CrMo V、12Cr1MoV、25Cr2MoVA、25Cr2Mo1VA、38CrMoAl、40CrV、50CrVA、15CrMn、20CrMn、40C rMn、20CrMnSi、25CrMnSi、30CrMnSi、30CrMnSiA、35CrMnSiA、20CrMnMo、40CrMnMo、20CrMnTi、40CrMnTi、20CrNi、40CrNi、45CrNi、50CrNi、12CrNi2、12CrNi3、20CrNi3、30CrNi3、37CrNi3、12Cr2Ni4、20Cr2Ni4、20CrNiMo、40CrNiMoA、18CrNiMnMoA、45CrNi MoVA、18Cr2Ni4WA、25Cr2Ni4WA共77個(gè)。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?2024?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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