Three-roll+Bending+SAW+Pipes

%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3EThree-roll+Bending+SAW+Pipes%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3EBangdong+Supply+%3C%2Fspan%3E%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3ESMLS+Steel+Pipe%2C%3C%2Fspan%3E%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3ESteel+Lined+Pipes%2C%3C%2Fspan%3E%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3ESSAW+Steel+Pipe.%3C%2Fspan%3E%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3EThe+production+line+adopts+three-roller%2Ffour-roller+bending+machine+for+forming.+For+the+formed+short+pipe+section%2C+tack+welding+is+firstly+carried+out+by+CO2+shielded+arc+welding%2C+heating+treatment+before+welding%2C+and+then+internal+straight+welding%2C+external+straight+welding%2C+internal+girth+welding%2C+and+external+girth+welding+are+conducted+with+single+wire%2C+multi-layer+and+multi-pass+welding.+After+completion+of+welding%2C+the+weld+seam+is+heat+preserved+to+reduce+the+weld+residual+stress+and+increase+the+property+of+stress+corrosion+resistance+of+metal.+The+characteristic+of+the+production+line+is+the+wall+thickness+and+diameter+of+product+is+large%2C+which+can+be+widely+used+for+structural+pipe%2C+such+as+steel+structural+bridge%2C+high-voltage+transmission+tower%2C+sea+and+land+wind+tower%2C+offshore+platform+equipment+and+super-long+pipe+piles+etc.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3ESAW+steel+pipes+is+short+of+Submerged+Arc+Welding+Steel+Pipe%2C+which+it+is+a+use+of+submerged+arc+soldering+process+to+manufacture+steel%2C+the+process+produces+a+very+high+current+density%2C+the+flux+layer+to+prevent+the+rapid+loss+of+heat%2C+and+concentrated+in+the+welding+region.+Submerged+arc+weld+of+high+quality%2C+high+production+efficiency%2C+arc+and+smoke+a+few+characteristics+of+submerged+arc+welded+pipe+is+widely+used+in+pressure+vessels%2C+pipe+manufacturing%2C+beams%2C+low+pressure+fluid%2C+steel+works.+The+main+products+of+the+SAW+steel+pipes+LSAW+Steel+Pipe%2C+Longitudinally+Submerged+Arc+Welding+Steel+Pipe+LSAW+steel+pipe%2C+it+is+the+use+of+submerged+arc+welding+production+of+straight+seam+steel+pipe.%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3E+%3Cdiv+class%3D%22title%22+style%3D%22background%3Anone+0px+0px+repeat+scroll+%23FFFFFF%3Bborder%3A0px+none%3Bfont-size%3A16px%3Bmargin%3A0px%3Bpadding%3A5px+0px%3Bvertical-align%3Abaseline%3Bfont-family%3Aarial%3Bfont-weight%3Abold%3B%22%3E+%3Cspan+class%3D%22font_bule%22+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bvertical-align%3Abaseline%3B%22%3EDifference+between+ERW+Pipes%2C+SSAW+Pipes+and+LSAW+Pipes%3C%2Fspan%3E+%3C%2Fdiv%3E+%3Cp+style%3D%22background%3Anone+0px+0px+repeat+scroll+%23FFFFFF%3Bvertical-align%3Abaseline%3Bcolor%3A%23CCCCCC%3Bfont-family%3ATahoma%3B%22%3E+%3Cspan+style%3D%22background-color%3Atransparent%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22background%3Anone+0px+0px+repeat+scroll+%23FFFFFF%3Bvertical-align%3Abaseline%3Bcolor%3A%23CCCCCC%3Bfont-family%3ATahoma%3B%22%3E+%3Cspan+style%3D%22background-color%3Atransparent%3Bcolor%3A%23000000%3B%22%3ESeamless+steel+pipes+are+mainly+used+in+oil+pipeline+and+gas+pipeline%2C+but+seldom+used+in+oil+pipelines+with+long-distance.+%3C%2Fspan%3E%3Cspan+style%3D%22background-color%3Atransparent%3Bfont-weight%3A700%3Bcolor%3A%23000000%3B%22%3EMost+long+distance+pipeline+applied+ERW+pipes%2C+SSAW+pipes+and+LSAW+pipes.%3C%2Fspan%3E%3Cspan+style%3D%22background-color%3Atransparent%3Bcolor%3A%23000000%3B%22%3E+Here+are+comparisons+of+technological+features+and+performance+of+these+pipes.+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cdiv+class%3D%22info%22+style%3D%22background%3Anone+0px+0px+repeat+scroll+%23FFFFFF%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A10px+0px%3Bvertical-align%3Abaseline%3Bfont-family%3ATahoma%3B%22%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3Cspan+style%3D%22font-weight%3A700%3B%22%3E1.+Electric+Resistance+Welding+Pipes%3C%2Fspan%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+Electric+Resistance+Welding+%28ERW%29+pipes+have+two+kinds+of+welding%2C+induction+welding+and+contact+welding.+The+ERW+pipe+applied+wide+hot+rolling+steel+profile+as+raw+material%2C+and+went+through+pre-bending%2C+continuous+forming%2C+welding%2C+straightening%2C+cutting+and+other+processes.+The+pipe+has+short+weld+joints%2C+high+dimensional+accuracy%2C+uniform+thickness%2C+and+excellent+surface+and+can+bear+high+pressure.+However%2C+it+also+has+shortcomings%2C+such+small+diameter+and+thin+wall%2C+and+the+weld+joints+are+easy+to+be+eroded.+Currently%2C+ERW+pipes+are+mainly+used+to+transport+gas+as+well+as+oil+to+city+residents.+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3Cspan+style%3D%22font-weight%3A700%3B%22%3E2.+Spiral+Submerged-Arc+Welding+Pipes%3C%2Fspan%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+Spiral+submerged+arc+welded+%28SSAW%29+pipes+has+spiral+welding+joints+and+the+pipes+are+welded+and+formed+at+the+same+time.+The+strip+steel+with+the+same+specification+can+produce+SSAW+pipes+with+various+diameters.+The+welding+joints+can+avoid+major+stress+and+have+better+force+resistance.+Disadvantages+are+poor+geometrical+diameters%3B+longer+welding+joints+and+joints+are+easily+to+have+cracks%2C+porosity+and+other+welding+defects.+According+to+the+design+specification+of+oil+and+gas+pipeline%2C+SSAW+pipes+only+can+be+used+in+the+third+and+fourth+class+areas.+Developed+countries+have+improved+the+technology%2C+apart+forming+and+welding%2C+and+have+pre-welding+and+precise+welding+processes+which+make+the+quality+of+welding+close+to+UOE+pipes.+Currently%2C+the+domestic+market+doesn%60t+master+this+technology+which+needs+to+be+improved.+SSAW+pipes+produced+by+traditional+technique+are+widely+used+in+the+project+of+natural+gas+transmission+from+West+to+East+China.+The+US%2C+Japan+and+Germany+believe+that+it%60s+not+suitable+to+use+SSAW+pipes+as+main+trunk%3B+Canada+and+Italy+use+it+partially+and+Russia+use+it+in+a+small+scale+with+strict+additional+condition.+China%2C+due+to+historical+reasons%2C+still+uses+SSAW+pipes+as+main+trunks+in+majority+areas.+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+%3Cspan+style%3D%22font-weight%3A700%3B%22%3E3.+Longitudinally+Submerged+Arc+Welding+%3C%2Fspan%3E%3Cspan+style%3D%22font-weight%3A700%3B%22%3EPipes%3C%2Fspan%3E+%3C%2Fdiv%3E+%3Cdiv+style%3D%22background%3Anone+0px+0px+repeat+scroll+transparent%3Bborder%3A0px+none%3Bmargin%3A0px%3Bpadding%3A0px%3Bvertical-align%3Abaseline%3Btext-align%3Ajustify%3B%22%3E+Longitudinally+Submerged+Arc+Welding+%28LSAW%29+pipes+use+single+plate+steel+as+raw+material%2C+applied+double-sided+submerged+arc+welding.+The+finished+products+have+larger+specifications+and+the+welding+joints+have+excellent+ductility%2C+plasticity+and+good+sealing.+LSAW+pipes+have+large+diameter%2C+thick+wall+and+can+withstand+high+pressure+and+low+temperature.+LSAW+pipes+play+a+major+role+in+oil+and+gas+pipelines+with+features+of+high+strength%2C+high+quality+and+long+distance.+According+to+the+standard+of+American+Petroleum+Institute+%28API%29%2C+the+LSAW+pipe+is+the+only+designated+pipe+in+large+scaled+oil+and+gas+transportation%2C+especially+when+the+pipelines+cross+the+densely+populated+urban+areas+and+the+first+and+second+class+cities.+%3C%2Fdiv%3E+%3C%2Fdiv%3E+%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp+class%3D%22cytext%22+align%3D%22center%22+style%3D%22font-family%3AArial%2C+Helvetica%2C+sans-serif%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3E%3Cstrong%3E%3Cspan+style%3D%22font-family%3A%27Times+New+Roman%27%3Bfont-size%3A18px%3B%22%3EProduct+standard%3C%2Fspan%3E%3C%2Fstrong%3E%3C%2Fspan%3E+%3C%2Fp%3E+%3Ctable0%3E%3C%2Ftable0%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp+class%3D%22cytext%22+align%3D%22center%22+style%3D%22font-family%3AArial%2C+Helvetica%2C+sans-serif%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22font-family%3A%27Time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