the common seamless steel pipe standards in china are as follows:1. seamless steel pipe for structure (gbt8162-2008). mainly used for general structure and mechanical structure. its representative material (brand): carbon steel, 20, 45 steel; alloy steel q345, 20cr, 40cr, 20crmo, 30-35crmo, 42crmo,

for the finished seamless steel pipe, some inspections must be done before leaving the factory, such as the chemical composition of the steel pipe product, the dimensional accuracy of the steel pipe product, and the water pressure test, spectral flaw detection and other aspects. similarly, when purc

the mechanical properties of seamless steel tube are important indicators to ensure the final performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of the steel. in the steel pipe standard, according to different use requirements, the tensi

in terms of processing technology: hot rolling is hot working, and cold drawing is cold working. hot rolling is rolling above the recrystallization temperature, and cold rolling is rolling below the recrystallization temperature.distinguish from appearance: cold-rolled seamless steel pipe has a brig

the seamless steel pipe is made of perforated whole round steel, and the steel pipe without weld seam on the surface is called seamless steel pipe.①the main production process of hot-rolled seamless steel pipe (△main inspection process):tube blank preparation and inspection△→tube blank heating→pierc