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1.4449棒料SMn21材料A4330圆钢ASTM1041H钢材2.4964圆棒30Cr2MoV
1.1221_STC6圆钢棒材料1.4362_ASTM1026圆棒料ASTM1041H_1.4545
供1.5732棒料SCM420H钢棒UNS S20910钢材P460NH圆钢ASTM1041H材料
