鋼管臥式擠壓機用H13擠壓針早期失效原因分析

Investigation of Early Stage Failure of H13 Fixed-mandrel of Horizontal Steel Tube Extruding Mill

摘要: 從裂紋形貌、硬度、殘余奧氏體、顯微組織、使用等方面對擠壓生產(chǎn)不銹鋼鋼管用H13 擠壓針開裂甚至斷裂的早期失效原因進(jìn)行了分析。結(jié)果表明:在擠壓鋼管過程中, H13 擠壓針冷卻不良, 使擠壓針表面發(fā)生二次淬火是擠壓針開裂的主要原因。提出了通過改造擠壓針的冷卻系統(tǒng)、熱處理工藝等措施, 可提高其使用壽命

Abstract: Investigation is made into the causes for early stage failure of cracking or even breaking of the H13 fixed-mandrel of the horizontal steel tube extruding mill as occurring during extruding stainless steel tubes,involving such aspects as crack morphology,hardness,residual austenite,microstructure and operation,etc. As a result,it is identified that the major cause for the said failure is that the H13 fixed-mandrel is not well cooled during the tube extrusion operation,and thus the mandrel’s surface gets secondarily-quenched. Therefore,it is proposed that actions like improving the cooling system of the fixed-mandrel and relevant heat treatment process be taken to prolong the service life of the fixed-mandrel.