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                                                                                                                                    355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:2020/10/22 點擊:0

                                                                                                                                    355直縫鋼管

                                                                                                                                      355直縫鋼管根據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。

                                                                                                                                      標準

                                                                                                                                      大口徑直縫鋼管國內一般采用GB/T3091-2008、GB/T9711.1-1997、API 5L標準 。

                                                                                                                                      用途

                                                                                                                                      大口徑直縫鋼管是大型管道工程、輸水輸氣工程、城市管網建設的佳選擇,國家西氣東輸使用該類型鋼管達20萬噸,市場前景廣闊。

                                                                                                                                      材質

                                                                                                                                      大口徑直縫鋼管常用材質有Q235A、Q235B、16Mn、20#、Q345、L245、L290、X42、X46、X70、X80、0Cr13、1Cr17、00Cr19Ni11、1Cr18Ni9、0Cr18Ni11Nb

                                                                                                                                      工藝流程

                                                                                                                                      大口徑直縫鋼管主要以雙面埋弧焊生產工藝為主,產品經折彎、合縫、內焊、外焊、矯直、平頭等多道工序,達到相關標準要求。

                                                                                                                                      導致焊縫隙產生變化,*產生開縫。在這樣的情況下,螺旋管的質量會被嚴重的影響,要采取有效的方法來控制。污水排放用螺旋焊管厚壁螺旋鋼管出產工藝簡樸,出產效率高,本錢低,發展較快。螺旋焊管的清洗和預熱可以去除松動或翹起的氧化皮、鐵銹、焊渣等。手動工具除銹能達到Sa2級,動力工具除銹可達到Sa3級,若鋼材表面附著牢固的氧化鐵皮,工具除銹效果不理想,達不到防腐施工要求的錨紋深度。酸洗利用溶劑、乳劑清洗低壓流體輸送用焊接鋼管(焊管)表面,以達到去除油、油脂、灰塵、潤滑劑和類似的有機物,厚壁螺旋鋼管的垛與垛之間應留有的通道,檢查道的寬度一般在0.5m左右,出入通道的寬度根據材料大小和運輸機械而定,一般在1.5到2m螺旋鋼管的堆垛高。


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