Quality standard:
Gb/t 8163: seamless steel tubes for liquid service
Gb 3087: seamless steel tubes for low and medium pressure
Gb 5310: seamless steel tubes and pipes for high pressure boiler
Astm a106: standard specification for seamless carbon steel pipe for high-temperature service
Astm a179: standard specification for seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes
Astm a192: standard specification for seamless carbon steel boiler tubes for high-pressure service
Astm a333: standard specification for seamless and welded steel pipe for low-temperature service
Astm a335: standard specification for seamless ferritic alloy-steel pipe for high-temperature service
Jis g3452: carbon steel pipes for ordinary piping
Jis g3454: carbon steel pipes for pressure service
Bs 3059: steel boiler and superheater tubes
Din 1629: seamless circular tubes of non alloy steels with special quality requirements
Din 17175: seamless steel tubes for elevated temperatures
Api 5l: line pipe

Size:
Outer diameter: hot finish: 2" - 30", cold drawn: 0.875" - 18"
Wall thickness: hot finish: 0.250" - 4.00", cold drawn: 0.035" - 0.875"
Length: random length, fixed length, srl, drl
Heat treatment: annealed, normalized
Surface: zinc coating, black phosphated, oiled.