新型Cr-Ni-Mo、Cr-Ni-W"穿孔-全程带芯纵轧法"中空钎钢
신형Cr-Ni-Mo、Cr-Ni-W"천공-전정대심종알법"중공천강
New Type of Cr-Ni-Mo and Cr-Ni-W Hollow Rock Drill Steel by "Hot-Penetrating and Hot-Rolling With Core Method"
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