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                                                                                                                                    15crmog直縫鋼管

                                                                                                                                    作者:滄州市大唐管業有限公司來源:http://www.locasity.com/時間:2020/07/28 點擊:0

                                                                                                                                    15crmog直縫鋼管

                                                                                                                                      直縫鋼管分為高頻焊管和雙面埋弧焊鋼管,一般口徑較小的直縫鋼管采用的工藝是高頻焊,而當直徑到了325mm時,就采用雙面埋弧焊了。直縫鋼管是焊縫與鋼管縱向平行的鋼管。直縫焊管生產工藝簡單,出產效率高,成本低,開展較快。螺旋焊管的強度一般比直縫焊管高,能用較窄的坯料出產管徑較大的焊管,還可以用同樣寬度的坯料出產管徑不同的焊管。但是與相同長度的直縫管相比,焊縫長度增加30~100%,而且出產速度較低。

                                                                                                                                      直縫鋼管是焊縫與鋼管縱向平行的鋼管。通常分為公制電焊鋼管、電焊薄壁管、變壓器冷卻油管等等。直縫焊管生產工藝簡單,生產效率高,成本低,發展較快。螺旋焊管的強度一般比直縫焊管高,能用較窄的坯料生產管徑較大的焊管,還可以用同樣寬度的坯料生產管徑不同的焊管。但是與相同長度的直縫管相比,焊縫長度增加30~100%,而且生產速度較低。

                                                                                                                                      綜述

                                                                                                                                      直縫鋼管按生產工藝可分為高頻直縫鋼管和埋弧焊直縫鋼管。埋弧焊直縫鋼管按其不同的成型方式又分為UOE、RBE、JCOE鋼管等。下面介紹最常見的高頻直縫鋼管和埋弧焊直縫鋼管的成型工藝。

                                                                                                                                      埋弧焊工藝

                                                                                                                                      1. 板探:用來制造大口徑埋弧焊直縫鋼管的鋼板進入生產線后,首先進行全板超聲波檢驗;

                                                                                                                                      2. 銑邊:通過銑邊機對鋼板兩邊緣進行雙面銑削,使之達到要求的板寬、板邊平行度和坡口形狀;

                                                                                                                                      3. 預彎邊:利用預彎機進行板邊預彎,使板邊具有符合要求的曲率;

                                                                                                                                      4. 成型:在JCO成型機上首先將預彎后的鋼板的一半經過多次步進沖壓,壓成"J"形,再將鋼板的另一半同樣彎曲,壓成"C"形,***形成開口的"O"形

                                                                                                                                      5. 預焊:使成型后的直縫焊鋼管合縫并采用氣體保護焊(MAG)進行連續焊接;

                                                                                                                                      6. 內焊:采用縱列多絲埋弧焊(最多可為四絲)在直縫鋼管內側進行焊接;

                                                                                                                                      7. 外焊:采用縱列多絲埋弧焊在直縫埋弧焊鋼管外側進行焊接;

                                                                                                                                      8. 超聲波檢驗Ⅰ:對直縫焊鋼管內外焊縫及焊縫兩側母材進行100%的檢查;

                                                                                                                                      9. X射線檢查Ⅰ:對內外焊縫進行100%的X射線工業電視檢查,采用圖象處理系統以保證探傷的靈敏度;

                                                                                                                                      10. 擴徑:對埋弧焊直縫鋼管全長進行擴徑以提高鋼管的尺寸精度,并改善鋼管內應力的分布狀態;

                                                                                                                                      11. 水壓試驗:在水壓試驗機上對擴徑后的鋼管進行逐根檢驗以保證鋼管達到標準要求的試驗壓力,該機具有自動記錄和儲存功能;

                                                                                                                                      12. 倒棱:將檢驗合格后的鋼管進行管端加工,達到要求的管端坡口尺寸;

                                                                                                                                      13. 超聲波檢驗Ⅱ:再次逐根進行超聲波檢驗以檢查直縫焊鋼管在擴徑、水壓后可能產生的缺陷;

                                                                                                                                      14. X射線檢查Ⅱ:對擴徑和水壓試驗后的鋼管進行X射線工業電視檢查和管端焊縫拍片;

                                                                                                                                      15. 管端磁粉檢驗:進行此項檢查以發現管端缺陷;

                                                                                                                                      16. 防腐和涂層:合格后的鋼管根據用戶要求進行防腐和涂層。


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