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    X80M鋼級煤制天然氣輸送用鋼制管前后的組織與性能

    Microstructure and Properties of X80M Steelfor SNG-linepipe as Shown before and after Pipe-making Process

    • 摘要: 詳細介紹了X80M鋼級煤制天然氣輸送用鋼板的組織，以及制管前后性能變化情況；結(jié)合現(xiàn)有數(shù)據(jù)與工程參數(shù)，利用斷裂韌性計算公式，分析該鋼管的服役狀態(tài)。分析結(jié)果表明：X80M鋼級煤制天然氣輸送用鋼板的組織以針狀鐵素體為主，且低溫韌性優(yōu)良；制管后，鋼材的屈服強度、抗拉強度、屈強比與硬度均有不同程度提高，低溫韌性降低；該X80M鋼級鋼管的安全性良好，若考慮氫氣的影響，可以在輸送壓力穩(wěn)定時安全使用。

       

      Abstract: Detailed in the paper are the microstructure of the X8 0M steel plate for SNG-linepipe-making and changes of its properties shown before and after pipe-making process.Based on the available data and engineering parameters the service conditions of the steel pipe are analyzed with the calculation formula of fracture toughness.The result reveals the following facts.The X80M steel plate is of the microstructure formed mainly of acicular ferrite, and has excellent low-temperature toughness.After pipe-making process, the material's mechanical properties like yield strength, tensile strength, yield ratio and hardness are more or less enhanced, while its low-temperature toughness is reduced.Moreover the X80M linepipe also has excellent safety performance.Even in case of the effect by hydrogen, the X80M linepipe can still assure of safe operation provided the transmission pressure is consisten enough.

       

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