除氧化物剂和芯棒润滑对热连轧无缝钢管产生内结疤缺陷的影响分析
제양화물제화심봉윤활대열련알무봉강관산생내결파결함적영향분석
Analysis of Influence by Deoxidant and Mandrel Lubrication on Development of Defective Inner Scar of Seamless Steel Pipe Hot-rolled with Mandrel Mill
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