3Gr13Mo材料90SiGr5圆棒21GrMoV57钢材2Cr12NiM0WV棒料17GrNi6-6

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20CrNi2M0元钢材40GrMnMo7_Nitr0nic60_34GrNi1Mo圆钢棒材90SiGr5

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