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20CrDIN 20Cr4供貨狀態(tài)及硬度：退火態(tài)，硬度≤179HBS化學成分（質(zhì)量分數(shù)）（%）碳C：0.18～0.24硅Si：0.17～0.37錳Mn：0.50～0.8020Cr圖片鉻Cr：0.70～1.00硫 S ：允許殘余含量≤0.035磷 P ：允許殘余含量≤0.035鎳 Ni：允許殘余含量≤0.30銅 Cu：允許殘余含量≤0.30鉬 Mo：允許殘余含量≤0.15鋼廠規(guī)格20CrΦ30合金鋼鋼板1*1250*250020CrΦ35合金鋼鋼板8*1250*250020CrΦ40合金鋼鋼板2*1250*250020CrΦ45合金鋼鋼板2*1250*250020CrΦ45合金鋼鋼板2*1250*250020CrΦ50合金鋼鋼板8*1250*250020CrΦ60合金鋼鋼板0*1250*250020CrΦ65合金鋼鋼板8*1250*250020CrΦ70合金鋼鋼板6*1250*250020CrΦ80合金鋼鋼板8*1250*250020CrΦ90合金鋼鋼板7*1250*250020CrΦ100合金鋼鋼板10*1250*250020CrΦ110合金鋼鋼板10*1250*250020CrΦ130合金鋼鋼板12*1250*250020CrΦ120合金鋼鋼板15*1250*250020Cr130-300合金鋼鋼板10*1250*250020Cr1-50合金鋼鋼板20*1250*2500力學性能播報編輯試樣毛坯尺寸（mm）：15熱處理：第一次淬火加熱溫度（℃）：880；冷卻劑：水、油第二次淬火加熱溫度（℃）：780～820；冷卻劑：水、油回火加熱溫度（℃）：200；冷卻劑：水、空抗拉強度（σb/MPa）：≥835屈服點（σs/MPa）：≥540斷后伸長率（δ5/%）：≥10斷面收縮率（ψ/%）：≥40沖擊吸收功（Aku2/J）：≥47布氏硬度（HBS100/3000）（退火或高溫回火狀態(tài)）：≤179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)應在合同中注明。主要特性播報編輯與15Cr鋼相比，有較高的強度及淬透性，在油中臨界淬透直徑達4 ～22mm，在水中臨界淬透直徑達11～40mm，但韌性較差，此鋼滲碳時仍有晶粒長大傾向，降溫直接淬火對沖擊韌性影響較大，所以滲碳后需二次淬火以提高零件心部韌性，無回火脆性；鋼的冷應變塑性高，可在冷狀態(tài)下拉絲；可切削性在高溫正火或調(diào)質(zhì)狀態(tài)下良好，但退火后較差；20Cr為珠光體，焊接性較好，焊后一般不需熱處理，但厚度大于15mm的零件在焊前需預熱到100～150℃，焊后也可不進行回火熱處理。加工工藝播報編輯材料加工該鋼淬火、低溫回火后具有良好的綜合力學性能，低溫沖擊韌性良好，回火脆性不明顯。滲碳時鋼的晶粒有長大趨勢，所以要求二次淬火，以提高心部韌性，不宜降溫淬火。當正火后硬度為170-217HB時，相對切屑加工性約為65%，焊接性中等，焊前應預熱到100-150℃，冷變形時塑性中等。為了提高模具型腔的耐磨性，模具成型后需要進行滲碳處理，然后再進行淬火和低溫回火，從而保證模具表面具有很高硬度、高耐磨性而心部具有很好的韌性。對于使用壽命要求不很高的模具，也可以直接進行調(diào)質(zhì)處理。國內(nèi)也有不少應用低碳馬氏體剛強烈淬火制造冷作模具的實例。該鋼模具零件工藝路線：下料-鍛造模胚-退火-機械粗加工-冷擠壓成型-再結(jié)晶退火-機械精加工-滲碳-淬火、回火-研磨拋光-裝配。工藝規(guī)范正火規(guī)范:溫度920-950℃，硬度156-179HBS。冷壓毛胚軟化處理規(guī)范：溫度700~720℃，保溫時間8~15h，以50~100℃/h的冷速，隨爐降至溫度≤550~600℃，出爐空冷。處理前硬度≤179HBS，軟化后硬度≤140HBS。應用舉例播報編輯這種鋼大多用于制造心部強度要求較高，表面承受磨損、截面在30mm以下的或形狀復雜而負荷不大的滲碳零件(油淬)，如：機床變速箱齒輪、齒輪軸、凸輪、蝸桿、活塞銷、爪形離合器等；對熱處理變形小和高耐磨性的零件，滲碳后應進行高頻表面淬火，如模數(shù)小于3的齒輪、軸、花鍵軸等。此鋼也可在調(diào)質(zhì)狀態(tài)下使用，用于制造工作速度較大并承受中等沖擊負荷的零件，這種鋼還可用作低碳馬氏體淬火用鋼，更進一步增加鋼的屈服強度和抗拉強度(約增加1.5～1.7倍)。計算公式播報編輯◆扁鋼:每米重量(公斤)=0.00785×厚度×邊寬◆管材:每米重量(公斤)=0.02466×壁厚×(外徑-壁厚)◆棒材：直徑*直徑*長度*0.00623=kg/米（每米的重量）◆板材：長*寬*高*0.00785=kg/米（每米的重量）新手上路成長任務編輯入門編輯規(guī)則本人編輯我有疑問內(nèi)容質(zhì)疑在線客服官方貼吧意見反饋投訴建議舉報不良信息未通過詞條申訴投訴侵權(quán)信息封禁查詢與解封?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?|?京ICP證030173號?京公網(wǎng)安備11000002000001號window.PAGE_DATA= 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冶鋼 分類 優(yōu)特鋼 結(jié)構(gòu)鋼 合結(jié)鋼 供應20Cr鋼號 規(guī)格 產(chǎn)地 可供數(shù)量（噸） 交貨地20Cr 14圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 15圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 16圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 18圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 20圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 22圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 25圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 26圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 28圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 30圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 32圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 35圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 38圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 40圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 45圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 48圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 30圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 52圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 55圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 60圓 大冶/興澄 30噸 上海寶山區(qū)20Cr 95圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 120圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 130圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 140圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 150圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 160圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 170圓 興澄/本鋼 30噸 上海寶山區(qū)20Cr 180圓 興澄/本鋼 30噸 上海寶山區(qū)
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