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(%)：≥45目錄1簡(jiǎn)介2化學(xué)成分3力學(xué)性能4特性及適用范圍簡(jiǎn)介播報(bào)編輯是一種滾動(dòng)軸承鋼執(zhí)行標(biāo)準(zhǔn)：GB/T 3203-1982;相對(duì)應(yīng)美國(guó)的牌號(hào)4320H執(zhí)行標(biāo)準(zhǔn)ASTM A534-04;日本牌號(hào)SNCM420執(zhí)行標(biāo)準(zhǔn)JIS G4053-2008;德國(guó)牌號(hào)20NiCrMo7執(zhí)行標(biāo)準(zhǔn)EN ISO 683/17-1999;化學(xué)成分播報(bào)編輯碳（C）0.19~0.23硅（Si）0.25~0.40錳（Mn）0.55~0.70鉻（Cr）0.45~0.65鎳（Ni）1.60~2.00鉬（Mo）0.20~0.30銅（Cu）≤0.25磷（P）≤0.030硫（S）≤0.030力學(xué)性能播報(bào)編輯沖擊韌性值 αkv (J/cm2)：≥78(8)試樣尺寸：試樣尺寸為25mm●熱處理規(guī)范及金相組織：熱處理規(guī)范：淬火,第一次880±20℃,第二次800±20℃,油冷;回火,150～200℃,空冷。金相組織：滲碳層為高碳馬氏體。心部為低碳馬氏體。特性及適用范圍播報(bào)編輯是一種常用的合金滲碳鋼，滲碳處理后表面有相當(dāng)高的硬度、耐磨性和接觸疲勞強(qiáng)度，同時(shí)心部還保留良好的韌性，能承受高的沖擊負(fù)荷。主要用于鐵路軸承等耐沖擊、耐磨損零件。新手上路成長(zhǎng)任務(wù)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(bào)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(tái)?|?京ICP證030173號(hào)?京公網(wǎng)安備11000002000001號(hào)window.PAGE_DATA= 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、低溫回火后應(yīng)用于諸如挖掘機(jī)斗齒(鎬牙)、農(nóng)用機(jī)械磨損件等要求耐磨損、耐沖擊的零件上。美國(guó)的SAE4320、臺(tái)灣地區(qū)和日本的SNCM420、原蘇聯(lián)的20ХН2М等鋼在化學(xué)成分和一些主要性能指標(biāo)上與我國(guó)的20CrNi2Mo鋼均是相同或相近的。化學(xué)成分錳 Mn：0.40~0.70磷 P：≤0.030硫 S：≤0.030鉻 Cr：0.35~0.65鎳 Ni：1.60~2.00鉬 Mo：0.20~0.30銅 Cu：≤0.3020CrNi2Mo鋼變形傾向明顯小于20Cr2Ni4鋼，其碳濃度梯度分布合理，硬化性能好，表層殘余奧氏體含量及分布理想，熱處理工藝性能優(yōu)于20Cr2Ni4鋼?？商娲?0cr2Ni4。
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