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个人中心42CrMo钢材播报讨论上传视频用于建筑的材料收藏查看我的收藏0有用+10同义词42CrMo（42CrMo）一般指42CrMo钢材42CrMo钢材从材料分类上来说属于合金结构钢，具有良好的机械性能及可加工性，应用相当广泛，主要有板材和圆棒两种类型的材料，其综合性能优于40Cr，得到了行业的认可。中文名42铬钼
外文名42CrMo
别    名42CrMo4
执行标准国标GB
产    地中国
分    类合金结构钢
等    级优等品
规    格板材、圆棒

目录
1产品简介2化学成份3力学性能4盐浴渗钒处理542CrMo回火642CrMo淬火7对应牌号8淬火规范9物理性能10工艺规范11典型应用举例
产品简介
播报编辑42CrMo钢材属于超高强度钢，具有高强度和韧性，淬透性也较好，无明显的回火脆性，调质处理后有较高的疲劳极限和抗多次冲击能力，低温冲击韧性良好。42CrMo钢材适宜制造要求一定强度和韧性的大、中型塑料模具。
化学成份
播报编辑碳 C ：0.38～0.45%硅 Si：0.17～0.37%锰 Mn：0.50～0.80%硫 S ：允许残余含量≤0.035%磷 P ：允许残余含量≤0.035%铬 Cr：0.90～1.20%镍 Ni：允许残余含量≤0.30%铜 Cu：允许残余含量≤0.30%42CrMo钢材钼 Mo：0.15～0.25%
力学性能
播报编辑硬度 ：退火,147~241HB42CrMo力学性能：抗拉强度σb (MPa)：≥1080(110)屈服强度 σs (MPa)：≥930(95)伸长率 δ5 (%)：≥12断面收缩率ψ (%)：≥45冲击功 Akv (J)：≥63冲击韧性值 αkv (J/cm2)：≥78(8)硬度 ：≤217HB为提高模具寿命达到80万模次以上，可对预硬钢实施淬火加低温回火的加硬方式来实现。淬火时先在500-600℃预热2-4小时，然后在850-880℃保温一定时间（至少2小时），放入油中冷却至50-100℃出油空冷，淬火后硬度可达50-52HRC，为防止开裂应立即进行200℃低温回火处理，回火后，硬度可保持48HRC以上。
盐浴渗钒处理
播报编辑42CrMo钢材的中性盐浴渗钒处理工艺，42CrMo钢材经中性盐浴渗钒处理可获得碳化物渗层。一、碳钒化合物，该渗层组织均匀，具有良好的连续性和致密性，厚度均匀,结构致密，具有很高的显微硬度和较高的耐磨性，表面硬度、耐磨性及抗粘着性等性能大幅度提高。二、VC在奥氏体中的溶解度比它在铁素体中的溶解度高，随着温度的降低，VC从铁素体中析出，使合金强化及晶粒细化，化合物层表现出较高的硬度。 42CrMo钢材属于高碳高铬莱氏体钢, 碳化物含量高,约占20 % ,且常呈带状或网状不均匀分布,偏析严重, 而常规热处理又很难改变碳化物偏析的状况, 严重影响了钢的力学性能与模具的使用寿命。而碳化物的形状、大小对钢的性能也有很大的影响, 尤其大块状尖角碳化物对钢基体的割裂作用比较大,往往成为疲劳断裂的策源地,为此必须对原材料轧制钢材进行改锻,充分击碎共晶碳化物,使之呈细小、均匀分布, 纤维组织围绕型腔或无定向分布, 从而改善钢材的横向力学性能。锻造时对钢坯从不同方向进行多次镦粗和拉拔,并采用“二轻一重”法锻造,即坯料始锻时要轻击,防止断裂,在980～1 020 ℃中间温度可重击, 以保证击碎碳化物,　42CrMo钢材未改锻,采用固溶双细化处理 ,即500 ℃及800 ℃左右二级预热,1 100～1 150 ℃固溶处理,淬入热油或等温淬火,750 ℃高温回火,机加工后960 ℃加热油冷后进行最终热处理, 也可使碳化物细化、棱角圆整化,晶粒细化。
42CrMo回火
播报编辑42CrMo钢材推荐的回火规范42CrMo钢材方案淬火温度 /℃回 火---用 途加热温度/℃介质硬度HB--ⅠⅡⅢ1020~1040消除应力去除应力，降低硬度去除应力，降低硬度150~170200~275400~425油或硝盐——61~6357~5955~57ⅣⅤⅥ1115~1130去除应力及形成二次硬化去除应力及形成二次硬化去除应力及形成二次硬化510~520℃多次回火-78℃冷处理加510~520℃一次回火-78℃冷处理加一次510~520℃回火，再-78℃冷处理———60~6160~6161~6
42CrMo淬火
播报编辑42CrMo钢材方案第一次预热/℃第二次预热/℃淬火温度/℃冷 却介质温度/℃在介质中冷却介质硬度（HRC）ⅠⅡⅢⅣⅤ550~660840~860950~10001020~10401020~10401115~11301115~1130油油熔融硝盐油熔融硝盐20~6020~60400~55020~60400~450至室温至油温5~10min至油温5~10min空冷空冷空冷空冷空冷58~6262~6362~6342~5042~50
对应牌号
播报编辑俄罗斯ГOCT 38XM、美国AISI 4140/4142、英国BS 708M40/708A42/709M40、法国NF 40CD4/42CD4、德国DIN 41CrMo4/42CrMo4、日本JIS SCM4、国际ISO 683/1 3
淬火规范
播报编辑普通淬火、回火规范：　淬火温度1000~1050℃，淬油或淬气，硬度≥ 60HRC；回火温度160~180℃，回火时间2h，或回火温度325~375℃，回火次数2~3次。
物理性能
播报编辑(1)临界点温度(近似值)：Ac1=730°C、Ac3=800°C、Ms=310°C。(2)线胀系数:温度20~100°C/20~200°C/20~300°C /20 ~400°C/20~500°C /20~600°C, 线胀系数: 11.1×10K/12.1×10K/12.9×10K/13.5×10K/13.9×10K14.1×10K。(3)弹性模量:温度20°C/300°C/400°C/500°C/600°C, 弹性模量210000MPa/185000MPa/ 175000MPa/165000MPa/15500oMPa
工艺规范
播报编辑热加工规范加热温度1150 ~1200°C,开始温度1130 ~1180°C,终止温度＞850°C,φ＞50mm时,缓冷。正火规范正火温度850~900°C,出炉空冷。高温回火规范回火温度680~700°C,出炉空冷。淬火、回火规范预热温度680 ~700°C,淬火温度840~880°C,油冷,回火温度580°C,水冷或油冷,硬度≤217HBW。亚温淬火强韧化处理规范淬火温度900°C,回火温度560°C,硬度(37±1) HRC感应淬火、回火规范淬火温度900°C,回火温度150~180°C,硬度54 ~60HRC。
典型应用举例
播报编辑适宜制作要求一定强度和韧性的大中型塑料模具。新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2025 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号 京公网安备11000002000001号window.PAGE_DATA= 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