After pickling stainless HRC, both sides of the strip section width 8-18mm long pass prevailing rough band called rollover. Since rollover after cold rolling can not eliminate a direct impact on the quality of cold-finished surface, so the general trimming delivery. In actual production, we should t

The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors. Steel ultraso

Hot straight seam steel pipe manufacturers, the small caliber in the output of crude oil or heating pipes, in order to reduce the heat pipes to the soil, outside the pipe plus insulation composite layer. Commonly used insulation material is a rigid polyurethane foam, a temperature of -185 ~ 120 ℃. T

Any open at both ends and having a hollow cross section, and a relatively large cross-section of steel whose length and perimeter, can be called steel pipe. When comparing hour length and cross section perimeter, may be referred to the pipe section or tubular parts, they all belong to the category o

Speaking of spiral steel pipe fracture and crack problem, we have to refer to the relatively backward country in the above application and production of spiral steel pipe, so for spiral steel pipe fracture is relatively small. However, due to our existing buried pipeline, most are spiral steel pipe,

Seamless steel pipe for casingStandard: API SPEC 5CT(American Petroleum Institute)Grade: J55,N80,L80,P110Dimension tolerance:TypesOut diameterWall thicknessCold drawn tubeOut diameterOut diameter<114.3±0.79－12.5％≥114.3－0.5％，＋1％MeMchanical properties:StandardGradeTensile strengthYield strengthAPI SPE

Also known as the "skin effect," When an alternating current through a conductor, due to induction effect caused by the larger cross section of the conductor current distribution is uneven, the closer the conductor surface current density. The skin effect increases the effective resistance of the co

In the lsaw steel pipe production process, because the primary process is in a hot state, so the heating operation is resolution product quality is very important process. The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to bi

Welded tube bending refers to long rolling (type, rod, pipe) in the longitudinal extent of the bending direction. Per meter length of the curved chord is called curvature per meter; total length of the curved with the total chord ratio is called the total length of the total curvature. Bending of al

(1) spiral boiler tube manufacturing process to determine their residual stress is large, according to foreign information records, and some even close to the yield limit, LSAW pipe boiler tube expansion process due to the use of residual stress close to zero. (2) spiral seam welding boiler pipe-lin