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 12crni3

军工特钢:12CrNi3

  标准:GB/T 3077-1988

  特性及适用范围:

  是用途较广的高级渗碳钢,与15Cr20Cr钢相比,其强度、塑性、淬透性均高。主要用来制 作重负荷条件下要求高强度,高硬度和高韧性的主轴及要求中心韧性很高或承受冲击负荷、表面耐磨、热处理变形小的轴、杆以及在高速和冲击负荷下工作的各种传 动齿轮、调节螺钉、凸轮轴

  化学成份:

  碳 C 0.100.17

  硅 Si0.170.37

  锰 Mn0.300.60

  硫 S :允许残余含量≤0.035

  磷 P :允许残余含量≤0.035

  铬 Cr0.600.90

  镍 Ni2.753.15

  铜 Cu:允许残余含量≤0.030

  力学性能:

  抗拉强度 σb (MPa)≥930(95)

  屈服强度 σs (MPa)≥685(70)

  伸长率 δ5 ()≥11

  断面收缩率 ψ ()≥50

  冲击功 Akv (J)≥71

  冲击韧性值 αkv (J/cm2)≥88(9)

  硬度 ≤217HB

  试样尺寸:试样毛坯尺寸为15mm

  热处理规范及金相组织:

  热处理规范:淬火:第一次860,第二次780,油冷;回火200,水冷、空冷。

  交货状态:以热处理(正火、退火或高温回火)或不热处理状态交货,交货状态应在合同中注明。

  加工性能:当硬度为HB260320时,相对切削加工性为60%~70

 

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