HM3钢_HM3钢是什么材料_HM3钢好用吗世望实业供3Cr3Mo3VNb（HM3）钢合金元素的构成特点2．1 3Cr3Mo3VNb钢的化学成份见 （表1） %CCrMoVNbSi≤Mn≤P≤S≤0.24-0.332.60-3.202.70-3.200.60-0.800.08-0.150.600.350.0300.0303.1.线膨胀系数的对比见 几种典型模具钢的线膨胀系数α (×10-6℃-13Cr2W8V14.314.715.616.316.115.215.04Cr5MoSiV10.010.911.412.212.813.313.63Cr3Mo3VNb10.110.811.611.912.312.613.03.2.热导率的对比见 表三 几种典型模具钢的热导率λ（W/（m·K9003Cr2W8V-20.1022.20-----24.28-23.034Cr5MoSiV-25.9627.6128.4728.0527.6326.77-25.99--3Cr3Mo3VNb-30.1430.3831.8232.2432.6632.66-32.6632.66-H1332.33------28.89---3.3.临界点的对比见 表四 几种热模锻典型模具钢的临界温度(Ac1、Ac3、Ar1、Ar3和Ms) （表4） 临界温度/℃Ac1Ac3Ar3Ar1Ms5CrNiMo720820-6902103Cr2W8V800～850850-690～7503802753Cr3Mo3VNb836～948--771～9233904Cr5MoSiV1(H13)850915815775340