JIS G3456 STPT 370 Carbon Steel Pipes Standard:JIS G3456 Carbon Steel Pipes for High Temperature Service JIS G3456 STPT 370 Carbon Steel Pipes mainly used for piping at a temperature over 350℃.   JIS G3456 STPT 370 Carbon Steel Pipes Quick Details Manufacture:Seamless or electric resistance welding process Out Dimensions: 14mm-508mm Wall Thickness: 2mm-60mm Length: Fixed(6m,9m,12,24m) or normal length(5-12m) Ends: Plain End, Beveled End, Treaded   Method of Manufacture (1)JIS G3456 STPT 370 Carbon Steel Pipes are manufactured from coarse-grained killed steel by the seamless or electric resistance welding process (2)When required by the purchaser, the pipe may be furnished with the bevel end.   Heat treatment of JIS G3456 STPT 370 Carbon Steel Pipes

Grade	Hot finished seamless steel pipe	Cold finished seamless steel pipe	Hot finished electric resistance welded steel pipe	Electric resistance welded steel pipe other than hot finished
STPT370	As  manufactured.  However,  low temperature annealing or normalizing may be applied, as necessary.	Low  temperature  annealed  or normalized.	As manufactured. However, low temperature annealing or normalizing may be applied, as necessary.	Low temperature annealed or normalized.

  Chemical Composition of JIS G3456 STPT 370 Carbon Steel Pipes

Grade	Chemical Composition %
	C	Si	Mn	p	S
STPT 370	0.25 max.	0.10~0.35	0.30~0.90	0.035 max.	0.035 max.

  Mechanical Properties of JIS G3456 STPT 370 Carbon Steel Pipes

Letter symbol of grade	Mechanical Properties
	Tensile strength	Yield strength	Elongation %
	kgf/m㎡  {N/ m㎡}	kgf/m㎡  {N/ m㎡}	No.11 and No.12 test pieces	No. 5 test pieces	No. 4 test piece
			Longitudinal	Transverse	Longitudinal	Transverse
STPT370	38 {373}min	22{216} min	30 min	25 min	23 min	28 min

  Appearance (1)The pipe are practically straight, and its both ends shall be at a right angle to its axis. (2) The inside and outside surfaces of the pipe shall be well-finished and free form defects that are detrimental to practical use.   Dimensions Tolerance of JIS G3456

Division	Tolerances on outside diameter	Tolerances on wall thickness	Tolerance on deviation in wall thickness
Hot finished seamless steel pipe	Up to 50 mm 【0.5mm	≤Up to 4 mm 【0.5mm	Up to and incl. 20 % of wall thickness
	50mm and over, up to 160mm 【1%
	160mm and over, up to 200mm 【1.6mm	≤4mm and over 【12.5%
	200mm and over 【0.8%
	However, for pipes 350mm and over in diameter, the length of circumference may substitute as a basis for tolerances, In this case, the tolerances shall be 【0.5%.
Cold finished seamless steel pipe and electric resistance welded steel pipe	Up to 40mm 【0.3mm	≤Up to 2 mm 【0.2mm	–
	40mm and over 【0.8%	≤2mm and over 【10%
	However, for pipes 350mm and over in diameter, the length of circumference may substitute as a basis for tolerances. In this case, the tolerances shall be 【0.5%

  Testings (1)Chemical analysis (2)Tensile Test (3)Flattening Test (4) Bending Test (5) Hydrostatic Test or Nondestructive Examination Report We will submit to the purchaser the report on the test results, method of manufacture, ordered dimensions, quantity and work lot number traceable to the manufacturing conditions, etc.