板材GCr15轴承钢65Mn 5CrNNiMo 钢板60SiMn 40CrNiMo 38CrMoAl

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40CrNNiMo C60Si2Mn 30CriMo 45rNi8Mo40CrNiMoV 20CrNiMo钢板 圆

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