Transactions of Materials and Heat Treatment

Title：Effect of forging defect of 20CrNiMo cone and jaw to mechanical properties

Authors： DING Yan-hong HUANG Han-yun(School of Mechanical Engineering Hu'nan University of Technology Zhuzhou Hu'nan 412008 China)

Unit：

KeyWords： cone and jaw mechanical property white spot overheat

ClassificationCode：TG316

year,vol(issue):pagenumber：2006,31(3):13-15

Abstract：

20CrNiMo steel can be matched as the materials for the cone and jaw of KX-250 tri-cone bit.Forging defect of the cone and jaw of 20CrNiMo steel affects the mechanical properties of production badly.In order to study these mechanical properties,the cone and jaw of 20CrNiMo steel have been tracked for its quality and special specimens were used to measure the properties.The results show that the mechanical properties of the cone and jaw of 20CrNiMo steel fall down evidently when forging defects are white spot and overheat,especially the plasticity and impact toughness.Some countermeasures are put forward in this paper as so to avoid the defects.

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Reference：

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