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45#钢板 Q235 A3 DC53 H13 718 P20 模具钢Cr12MoV 精光板 加工
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销售优质45号钢板圆棒4cr13模具钢CR12MOV p20圆钢65Mn弹簧钢包邮
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模具钢CR12MOV淬火58-60HRC冲子料现货材料200×200真空热处理*
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45号钢SKD61模具钢CR12MOV圆钢D2板材SKD11圆棒S136钢材S136H黑棒
