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    S32750超級雙相不銹鋼管坯的熱塑性研究

    Study on Thermoplasticity of S32750 Super Duplex Stainless Steel Round Billet for Pipe-making

    • 摘要: 二輥斜軋熱軋穿孔機制造雙相不銹鋼毛管具有成本低的優(yōu)點，但由于穿孔機變形劇烈，對管坯材料熱塑性要求很高。針對S32750超級雙相不銹鋼管坯，采用Gleeble 1500熱模擬試驗機進行高溫拉伸試驗，得到不同溫度下材料斷面收縮率和抗拉強度的變化規(guī)律，并用掃描電鏡分析其斷口形貌，測量不同溫度下材料中鐵素體的含量，與熱力學軟件計算出的鐵素體理論值進行比較，發(fā)現(xiàn)在高溫下S32750管坯鐵素體含量控制在60%～70%時，材料的熱塑性最為理想，為該材料管坯順利實現(xiàn)熱穿孔提供了依據(jù)。

       

      Abstract: Although the 2-roll rotary hot-piercing mill has the advantage of cost effectiveness when making the duplex stainless steel shell, due to its severe deformation during the operation, very high thermoplasticity of the round billet is required.Addressing the S32750 super duplex stainless steel round billet, the Gleeble 1500 thermal simulator is used to carry out the high-temperature tensile test, having got the reduction of the cross-sectional area and the change law of the tensile strength of the steel at different temperatures.The fracture morphology is analyzed with the SEM, and the ferrite contents of the steel at different temperatures are also measured, and then compared with the theoretical values of the ferrite contents as calculated by relevant thermodynamic software.As a result, it is identified that when the ferrite content of the S32750 steel billet is controlled within the range of 60%~70%at a high temperature, it presents the best thermoplasticity, which provides a basis for smooth hot-piercing of the said billet.

       

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