1.20CrMnMo渗碳钢的特性：80mm厚***定扎***20CrMnMo钢板20CrMnMo钢是一种高强度的***渗碳钢，归于Cr-Mn-Mo系列合金结构钢，20CrMnMo渗碳钢强度高于15CrMnMo，塑性及耐性稍低，20CrMnMo钢淬火回火后有杰出的归纳力学功能和低温冲击韧度，淬透性及力学功能比20CrMnTi钢较高，与12CrNi3A钢恰当，比20CrNi3A钢稍低；20CrMnMo钢渗碳淬火后具有较高的抗弯强度和耐磨功能，渗碳后其剩余奥氏体含量较高，不宜直接淬火；20CrMnMo钢的功能与日本合金结构钢SCM421附近，20CrMnMo钢用于制作要求外表硬度高、耐磨功能好的重要渗碳件，如齿轮、凸轮轴连杆、销等；20CrMnMo钢热加工功能杰出，正火后切削加工功能好，切削加工性优于12CrNi3A钢和20CrNi3A钢，但磨削时易发生裂纹，焊接功能较差，20CrMnMo钢合适于电阻焊接，焊前要恰当预热，焊后应及时回火。20CrMnMosteelisakindofhigh-strengthhigh-gradecarburizingsteel,belongingtoCrMnMoseriesalloystructuralsteel.20CrMnMocarburizingsteelhashigherstrengththan15crmnmo,lowerplasticityandtoughness.Afterquenchingandtempering,20CrMnMosteelhasgoodcomprehensivemechanicalpropertiesandlow-temperatureimpacttoughness,higherhardenabilityandmechanicalenergythan20CrMnTisteel,equivalentto12CrNi3Asteel,slightlylowerthan20crni3asteel;20CrMnMosteelhascarburizingandquenchingAftercarburizing,ithashighbendingstrengthandwearresistance,andthecontentofretainedausteniteishigh,soitisnotsuitabletobequencheddirectly;theperformanceof20CrMnMosteelissimilartothatofscm421alloystructuralsteel.HenanChangshengironandSteelCo.,Ltd.recommends20CrMnMosteeltobeusedformanufacturingimportantCarburizedpartswithhighsurfacehardnessandgoodwearresistance,suchasgears,camshaftconnectingrods,pins,etc.;20CrMnMosteelhotworkingAfternormalizing,themachinabilityisbetterthan12CrNi3Asteeland20crni3asteel,butitiseasytoproducecracksduringgrinding,andtheweldingperformanceispoor.20CrMnMosteelissuitableforresistancewelding.Beforewelding,itshouldbepreheatedproperlyandtemperedintime.2.20CrMnMo渗碳钢的化学成分：碳C:0.17-0.23%硅Si:0.17~1.37%锰Mn:0.90~1.20%硫S:答应剩余含量≤0.035%磷P:答应剩余含量≤0.035%铬Cr:1.10~1.40%镍Ni:答应剩余含量≤0.030%铜Cu:答应剩余含量≤0.030%钼Mo:0.20~0.30%3.20CrMnMo渗碳钢的力学功能：抗拉强度σb(MPa):≥1175(120)屈从强度σs(MPa):≥885(90)伸长率δ5(%):≥10断面缩短率ψ(%):≥45冲击功Akv(J):≥55冲击耐性值αkv(J/cm2):≥69(7)硬度:≤217HB试样尺度:试样毛坯尺度为15mm4.20CrMnMo渗碳钢的热处理标准及金相安排：热处理标准：（1）淬火：加热温度850&plu***n;15℃，油冷。（2）回火：加温温度200&plu***n;20℃，水冷或空冷。金相安排：回火马氏体。5.20CrMnMo渗碳钢的交货状况：20CrMnMo渗碳钢一般是以热处理（正火、退火或高温回火）或不热处理状况交货，交货状况应在合同中注明。6.20CrMnMo渗碳钢的用处：20CrMnMo渗碳钢合适用于制作要求外表硬度高、耐磨性好的重要渗碳零件，如齿轮、凸轮、曲轴、连杆、活塞销、球头销、石油钻机的牙轮、钻头号。20CrMnMocarburizingsteelissuitableformanufacturingimportantcarburizingpartswithhighsurfacehardnessandgoodwearresistance,suchasgears,cams,crankshafts,connectingrods,pistonpins,ballpins,drillingrigs'rollers,drills,etc.)