there are two types of galvanizing methods for seamless pipes: hot-dip galvanizing and electro-galvanizing. hot-dip galvanizing includes wet method, dry method, lead-zinc method, redox method, etc. the main difference between different hot-dip galvanizing methods is what method is used to activate t

seamless pipe (smls) is a steel pipe that is perforated from a whole round steel and has no welds on the surface. seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes and high-precision structural steel pipes for

spiral steel pipe (ssaw) is a spiral seam steel pipe made of strip steel coil as raw material, often warmly extruded, and welded by automatic double-wire double-sided submerged arc welding process. the spiral steel pipe feeds the strip into the welded pipe unit. after being rolled by multiple r

the factors that affect the coating of seamless pipes mainly include the following four points: the passive film of seamless steel pipes belongs to a suppressed metastable structure in thermodynamics, and its maintenance effect is related to the medium in the environment. but no matter what kind of

cold rolling refers to the processing of steel plates or strips into various types of steel through cold working such as cold drawing, cold bending, and cold drawing at room temperature.cold-rolled precision seamless steel pipe is a kind of seamless pipe with high dimensional accuracy and good surfa