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 12CrmoV

 12CrMoV,合金结构钢。统一数字代号:A31122

  标准:GB/T 3077-1988

  [1]?【化学成分】(质量分数)(%

  碳 C 0.080.15

  硅 Si0.170.37

  锰 Mn0.400.70

  硫 S :允许残余含量≤0.035

  磷 P :允许残余含量≤0.035

  铬 Cr0.300.60

  镍 Ni:允许残余含量≤0.030

  铜 Cu:允许残余含量≤0.030

  钒 V 0.150.30

  钼 Mo0.250.35

  [2]?【力学性能】

  试样毛坯尺寸(mm):30

  热处理:

  第一次淬火加热温度():970;冷却剂:空

  第二次淬火加热温度():-

  回火加热温度():750;冷却剂:空

  抗拉强度 σb (MPa)≥440(45)

  屈服强度 σs (MPa)≥225(23)

  伸长率 δ5 ()≥22

  断面收缩率 ψ ()≥50

  冲击功 Akv (J)≥78

  冲击韧性值 αkv (J/cm2)≥98(10)

  布氏硬度(HBS100/3000)(退火或高温回火状态):241

  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。

  【主要特性】

  这是一种珠光体型耐热钢,在高温长期使用时具有高的组织稳定性和热强性,热处理时过热敏感性低,无回火脆性倾向;钢在冷变形时塑性高,可切削性尚好;焊接性一般,但壁厚零件需预热到200300,焊后需要进行除应力处理。这种钢通常在高温正火及高温回火状态下使用,使用温度在-40560

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