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Difference between ERW and HFW
ERW steel pipe: low-frequency or high-frequency resistance welding manufacturing process with a straight seam steel pipe; HFW steel pipe: frequency equal to or greater than 70kHz welding current welding ERW Pipe. Electric resistance welding steel pipe: resistance welding a weldment combined press...Read more -
Defects in square tube piercing
Many square tube defects in perforation caused, so square and rectangular tube power transfer process is a key program production side of the tube. Perforation main difficulty lies in the low alloy high perforation performance, when necessary in order to ensure the quality of the deformation para...Read more -
Basic Knowledge of SSAW Steel Pipe
Spiral steel pipes are widely used industrial, construction and other industries . It’s raw mataerial is strip steel rolled plate , through normal temperature extrusion molding, with automatic double wire welding double-sided submerged arc welding technology with the spiral seam pipe. Mainly used...Read more -
Quotation sheet for stainless steel welded pipe Nov.2019
Quotation sheet for stainless steel welded pipe （Material：316L、304/304L Standard：ASTM A312，Delivery state ：weld、pickling ） Nominal OD OD SCH 5S SCH 10S SCH 40S Thickness 304 316L Thickness 304 316L Thickness 304 316L N.B IN MM mm $/kg $/kg mm $/kg $/kg mm $/kg ...Read more -
Difference between erw pipe and uoe pipe
Compared with submerged arc welding, high-frequency resistance welded steel pipe (ERW steel pipe) does not add any welding material during welding, weld without hot melt state, just weld metal after recrystallization process, Therefore, exactly the same chemical composition of the base metal and ...Read more -
Defect of Large-diameter and Thick-walled Tubes
Rare crack morphology exist: crack parts of the tube on the surface, the appearance of cracks is one of the rare defects in the tube production in the S355. Dendritic, intermittent appearance oxidation. Further microscopic cracks within the iron oxide, black or dark gray. Analysis: the main reaso...Read more -
Comparison for spiral pipes and seamless pipe
Seamless tube is a kind of hollow section, and the peripheral no joint of strip steel. Seamless steel pipeis no seam, hot or cold drawing process molding. Characteristic is confined good. Spiral pipe features: straight seam welding tube production process is simple, high production efficiency, lo...Read more -
SSAW pipe price list Nov.2019
SSAW pipe price list Nov.2019 SY/T5037-2000，Material:Q235B； WT OD 219 273 324 356 406 508 610 711 762 813 914 1016 1067 1118 1168 1219 1321 6 586 586 586 586 586 586 586 586 586 586 586 586 600 600 600 600 600 7 586 586 586 586 586 586 586 586 586 586 586 586 600 600 600 600 ...Read more -
ASTM A312 SEAMLESS STEEL PIPE
ASTM A312 SEAMLESS STEEL PIPE ASTM A 312 seamless steel pipe is mainly applies to the use of high temperature and general corrosion seamless and welded austenitic stainless steel male pipe. Level mainly TP304H, TP309H, TP309HCb, TP310H, TP310HCb,TP316H, TP321H and TP347 suitable for high-temperat...Read more