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                                                                                                                                    q345r大口徑直縫鋼管產品展示

                                                                                                                                    作者:滄州市大唐管業有限公司來源:http://www.locasity.com/時間:2018/07/10 點擊:0

                                                                                                                                    Q345R大口徑直縫鋼管,高壓輸送要求使用強度更高、韌性更好的管線鋼,高鋼級鋼管減少鋼材消耗、降低材料費用,因此高壓輸送采用高鋼級鋼管呈強勁的發展趨勢。日本、歐洲、北美已試制出X100和X120管線鋼,并在研究更高鋼級的管線鋼。我國當前X70管線鋼生產已趨于成熟,基本實現國產化。2006年7月,鞍鋼研制開發的X100管線鋼獲得成功,2006年11月寶鋼成功軋制出高強度高韌性X120管線鋼板。因此,管道建設以及高鋼級管線鋼的開發應用要求加快大口徑焊管的生產技術進步,提高焊管成形質量,解決大口徑直縫焊管生產問題進而適應各種需求。由于對焊管生產過程中復雜的變形認識相對較淺,理論分析相對不足,生產上還存在很多問題,不同鋼級和尺寸的焊管加工參數均需要很大調整。所以,隨著對焊管生產過程中各種現象的進一步深入了解,大口徑直縫焊管有限元仿真將不斷向廣度和深度發展。
                                                                                                                                     
                                                                                                                                    大口徑雙面埋弧焊直縫鋼管生產工藝,根據GB/T3091-2008《低壓流體輸送用焊接鋼管》標準的規定,鋼管的內外表面應光滑,不允許有折疊、裂縫、分層、搭焊、斷弧、燒穿及其他深度超過壁厚下偏差的允許有深度不超過壁厚下偏差的其他局部缺陷存在。鋼管應做機械性能試驗、拉伸試驗、彎曲試驗、壓扁試驗、導向彎曲試驗以及液壓試驗,并要達到標準規定的要求。鋼管應能承受一定的內壓力,試驗壓力為5.05Mpa,保持時間不小于5S,實驗過程中,鋼管不出現滲漏現象。電阻焊鋼管允許用超聲波探傷檢驗或渦流探傷檢驗代替液壓試驗。埋弧焊鋼管允許有超聲波探傷檢驗或射線探傷檢驗代替液壓試驗。檢驗合格后出廠。

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