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    X80鋼級Φ1 219 mm×26.4 mm大變形直縫埋弧焊管的開發(fā)

    Development of Φ1 219 mm×26.4 mm X80 High-deformation LSAW Tube

    • 摘要: 選用合適比例的鐵素體+貝氏體雙相組織的大變形鋼板，通過小步長JCO成型控制、優(yōu)化設(shè)計鋼管焊接工藝參數(shù)、回歸分析確定鋼管擴徑工藝參數(shù)，成功開發(fā)出X80鋼級Φ1 219 mm×26.4 mm大變形直縫埋弧焊管。經(jīng)檢驗，該鋼管焊接接頭的拉伸性能、彎曲性能、低溫沖擊性能、硬度均滿足技術(shù)條件要求；焊接接頭-10℃夏比沖擊韌性平均值超過200 J，富余度較高；管體、焊縫和熱影響區(qū)在系列溫度20，0，-10，-20，-40，-60℃的夏比沖擊韌性良好；管體橫向的剪切面積百分比隨溫度的降低而減小，FATT85%低于-10℃；靜水壓爆破試驗加壓過程中未發(fā)生泄漏。

       

      Abstract: Successfully developed is theΦ1 219 mm×26.4 mm X80 high-deformation LSAW tube with the proportionally proper ferrite+bainite double phase, high-deformation steel plate as the raw material, and by means of the small JCO forming control and the optimized design of the steel tube welding parameters, and determination of the pipe expansion parameters via the regression analysis.Related test results show that all the mechanical properties of the welded joint of the tube are in conformity to applicable technical requirements, including tensile property, bending property, low-temperature impact property and hardness;mean value of the -10℃ Charpy impact toughness is higher than 200 J, which means a high margin;the Charpy impact toughness of the pipe body, weld seam and the HAZ is good under the serial temperatures as 20, 0, -10, -20, -40, -60℃;the transversal shearing area percentage of the pipe body is being reduced along with falling of the temperature;FATT85% is less than 10%;and no leakage is found during the pressure-boosting process of the hydrostatic burst test.

       

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