In the ? paper , the structure and properties of ESC ? 27 Si 2 Mn 2 Ni 2 CrMo for large? dia column teeth drilling body are studied.

  • 研究了电渣 熔铸 大柱齿钎体用27Si2Mn2Ni2CrMo钢的组织与性能.

  • 互联网摘选 2025-01-20 18:35:19

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