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Quality Standard: 
API 5L Standard Specification for Seamless Line Pipe or Seamless Pipe Line
ASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing 
ASTM A106 Seamless Carbon Steel Pipes for oil pipeline and gas pipeline transportation 
GB/T8162 Seamless Steel Tubes for Structural Purposes
JIS G3441 Alloy steel tubes for machine purposes 
JIS G3444 Carbon steel pipes for general structural purposes 
JIS G3445 Carbon steel tubes for machine structural purposes 
DIN 2391 Seamless Precision Steel Tubes 
EN10305 Steel tubes for precision applications. Technical delivery conditions. Seamless cold drawn tubes
EN 10297 Hot rolled seamless steel tubes with an application in the mechanical and general engineering
EN 10210:Seamless structural steel pipes

Steel Grade: 
API 5L: Grade A, Grade B, X42, X46, X52, X56, X60, X65, X70, X80
ASTM A 53: Grade A, Grade B, Grade C, Type F, Type E
ASTM A519: 1010-1045, 4130-4142, 5135
GB/T8162: 10, 20, 35, 45, 16Mn, 12C rMo, 15CrMo, 12C rl MoV
JIS G3441: SCM 415 TK, SCM 418 TK, SCM 420 TK, SCM 430 TK, SCM 435 TK, SCM 440 TK 
JIS G3444: STKM 11A, STKM 12, STKM 13, STKM 14, STKM 15, STKM 16, STKM 17, STKM 18
STKM 19, STKM 20
DIN 2391: St30Si, St30A1, St35, St45, St52
EN10305: E235, E355 
EN 10297: E355K2, E470, E420J2, E590K2 
EN 10210: S235JRH; S275J0H, S275J2H; S355J0H, S355J2H; S275NH, S355NH; S275NLH, S355NLH

Size and Specification of Seamless Pipes 
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: Bright annealed, , Spheroidize annealed
Normalized, Stress relieved, Cold finished, Quenched and Tempered
Delivery Condition ： BKS, NBK,BK ,BKW, GBK(+A), NBK(+N), BK(+C)
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