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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 -
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 -
Bright annealing tube
Bright annealing tube under a reducing atmosphere or in a vacuum protection, after high temperature solid melting and rapid cooling to get the stainless steel tube, requiring the inner surface has a very good surface roughness and cleanliness, is a comprehensive consideration of organizational st...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 -
Angle for spiral welded steel pipe
From the welding process, the spiral steel pipe with straight seam welding method is consistent, but inevitably there will be a lot of Longitudinal welds T, so there is the probability of weld defects, which is also greatly improved, and T-weld welding residual stress is large, the weld metal are...Read more