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    UNS S32760無縫鋼管熱擠壓裂紋原因分析及控制

    Investigation of Causes for Hot-extrusion Cracking of UNS S32760 Seamless Steel Tube and Relevant Control Measures

    • 摘要: 分析超級雙相不銹鋼UNS S32760棒材在熱擠壓時產(chǎn)生裂紋的原因；采用金屬間化合物特定的化學試劑、掃描電鏡能譜分析，并結(jié)合超級雙相不銹鋼熱力學相平衡圖和TTT等溫轉(zhuǎn)變曲線等，分析產(chǎn)生σ金屬間化合物的原因，進一步得出σ金屬間化合物是超級雙相不銹鋼UNS S32760棒材在熱擠壓時產(chǎn)生裂紋的主要原因。調(diào)整冶煉、熱擠壓和熱處理工藝后再次進行熱擠壓試驗，發(fā)現(xiàn)超級雙相不銹鋼UNS S32760管體內(nèi)外表面光滑，無裂紋、褶皮等缺陷，鋼管綜合性能達到標準和客戶要求。

       

      Abstract: Investigated are the causes for cracking of the UNS S32760 super duplex stainless steel bar as occurring during the hot-extrusion process.Also analyzed is the reason for development of the σ inter-metallic compound by means of specific chemical reagent for inter-metallic compound, and SEM-EDS as well as the super duplex stainless steel thermodynamic phase equilibrium diagram, and the TTT isothermal transformation curve, which further leads to the conclusion that the σ inter-metallic compound is the key factor responsible for development of the said cracking.Accordingly, the hot extrusion test is conducted again after adjusting the melting, hot extrusion and heat treatment processes.As a result, the hot-extruded UNS S32760 super duplex stainless steel tube possesses smooth inner and outer surfaces, and is free of defects like crack and folding, etc., having its comprehensive performance up to requirements as specified by applicable specification and the customer as well.

       

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