20CrMo,20CrMo,20CrMo圆钢 20CrMo,20CrMo价格,20CrMo合金钢 +++++++++++++++++++++++++++++++++++++++++ ***************************************** 批发20CrMo合结钢 牌号:20CrMo 标准:GB/T 3077-1988 ●特性及适用范围: 淬透性较高,无回