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 ServiceJIS 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

Steel Grade: 
GB/T 8163: 10#, 20#, 35#, 45#, 16MN(Q345B)
GB 3087: 10#, 20#, 35#, 45#, 16MN(Q345B)
GB 5310: 20G, 12Cr1MoV, 12Cr1MoVG, 12CrMoG
ASTM A106: Gr A, Gr B, Gr C
ASTM A333: Gr 1, Gr 3, Gr 6, Gr 8
ASTM A335: P1, P2, P5, P9, P11, P12, P22
JIS G3452: SGP
JIS G3455: STS 370, STS 410, STS 480
BS3059: HFS320, CFS320
DIN 1629: St 37.0, St 44.0, St 52.0
DIN 17175: St35.8, St45.8, 17Mn4, 19Mn5, 15Mo3, 13CrMo910, 10CrMo910, 14MoV63, X20CrMoV121
API 5L: A B X42,X46, X52, X60, X65, X70, X80

Size: 
OuterDiameter: Hot finish: 2" - 30", Cold drawn: 0.875" - 18"
Wall Thickness: Hot finish: 0.250" - 4.00", Cold drawn: 0.035" - 0.875"
Length: RandomLength, Fixed Length, SRL,DRL
Heat treatment: Annealed, Normalized
Surface: Zinc coating, black phosphated, oiled
Packing: Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags
on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips
Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield
strength, Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test,
Blow Test, Impact Test etc), Exterior Size Inspection, Nondestructive Test (Ultrasonic flaw detector, Eddy
current flaw detector), Hydrostatic Test.,

Mill Test Certificate: EN 10204/3.1B