直縫焊管是借助一再銲接醫衛（wèi）組或是是借助埋弧焊醫（yī）衛組銲接而成。一再銲接（jiē）直縫焊管中國（guó）大陸當前可生（shēng）產適（shì）用範圍：標準10-711mm厚薄（báo）3-25mm。埋弧焊直縫焊管可（kě）生產適用範圍，標準：325-1420mm厚薄8-25mm。直（zhí）縫焊管生（shēng）產工藝更為簡便（biàn），生產運（yùn）行（háng）速度快因此它在城市開展建設，鋼構工程，輸氣（qì）工程和供（gòng）進（jìn）行排泄項目建設層麵起著使不得（dé）代替的實際作用。因此挑選（xuǎn）好質（zhì）量（liàng）更好的直縫焊管是確（què）保工（gōng）程更為安全較為順當開展的很有必要元素。
Longitudinal welded pipe is welded by high frequency welding machine or submerged arc welding machine. At present, the domestic production range of high frequency welded straight seam welded pipe is 10-711mm in diameter and 3-25mm in thickness. Submerged arc welding straight seam welded pipe can be produced in a range of sizes: 325-1420 mm thick 8-25 mm. Longitudinal welded pipe has simple technology and fast production speed, so it plays an irreplaceable role in urban construction, steel structure engineering, gas transmission engineering and water supply and drainage engineering construction. Therefore, the selection of high quality straight seam welded pipe is a necessary factor to ensure the safe and smooth operation of the project. 在挑選（xuǎn）直縫（féng）焊管（guǎn）的期間（jiān）老大我們要（yào）進行理會材料，通常直縫焊（hàn）管的材料有Q235,16Mn，和L245等等（děng），在我們驗（yàn）收的期間首次（cì）要決定（dìng）材料有沒（méi）有符合標準。其（qí）次要認為直縫焊管（guǎn）的壁厚，有（yǒu）沒有實現具體要求的壁厚。衙役有沒有在國度具體要求適（shì）用範圍裏麵。老三要看焊管要樣兒狀況，有沒有有鏽（xiù），鏽的具體程（chéng）度，通常黃鏽並未實際問題，通常黃鏽（xiù）都是關於（yú）一層浮鏽，紅（hóng）鏽（xiù）略微有些重要一（yī）些。
When choosing straight seam welded pipe, we should first pay attention to the material quality. Generally, the material of straight seam welded pipe is Q235, 16Mn, L245 and so on. When we inspect the goods, we should first determine whether the material is qualified. The second is to see whether the wall thickness of the longitudinal welded pipe meets the required wall thickness. Is tolerance within the scope of national requirements? Third, it depends on the surface condition of welded pipe, whether there is rust or not, the degree of rust, general yellow rust is no problem, general yellow rust is a layer of floating rust, red rust slightly more serious.
不（bú）過退學後來也（yě）能夠在一部分並非（fēi）很（hěn）從嚴的具體項目上采用，不過在滿（mǎn）足相關條件（jiàn）時是黑鏽，作出說明這管材就隻得賣廢鐵了。另外還有我們要看一下子（zǐ）焊管要樣兒有沒有（yǒu）有由，其主要原因在於直縫焊管在生產環節中在醫衛組上有或許會汙染油漬，最（zuì）終我們要認為子（zǐ）兩端的截麵狀況（kuàng）有沒有是圓麵如果有（yǒu）鎮壓不收拾。同時看下（xià）有沒有有連鬢胡子。經曆上述數念從嚴的開展（zhǎn）檢測鬼點子在滿（mǎn）足相關條件時焊管都借助，這樣的話作出說明（míng）管材是符合標準的。
But after annealing, it can also be used in some less stringent projects, but if it is black rust, it means that the pipe can only sell scrap iron. Also, we need to see if there is any reason for the surface of the welded pipe, because the longitudinal welded pipe may be contaminated with oil stains on the unit during the production process. Finally, we need to see whether the cross-section of both ends of the pipe is round or irregular extrusion. It also depends on whether there are burrs. After the above several strict testing methods, if the welded pipe passes, then the pipe is qualified.
