JIS G3454 STPG370 Carbon Steel Pipes for Pressure Service

JIS G3454 STPG370 Carbon Steel Pipes for Pressure Service
Standard:JIS G3454
JIS G3454 STPG370 Carbon Steel Pipes used for pressure service at an approximate maximum temperature of 350℃. 
Grade and Designation :STPG 370 , STPG 38

JIS G3454 STPG370 Carbon Steel Pipes Quick Details
Type:Seamless Steel Pipe. 
Material:STPG 370 , STPG 38
Outside Diameter:34mm-219mm
Wall thickness:3.4mm——20mm
Length:6M or specified length as required. 
Ends:Plain End、Beveled End、Treaded
Additional Info
Payment Terms:T / T, LC
Surface:Tubes will be varnished (Outside only) to prevent rust.
Marking:Standard + Steel Grade + Size + Heat No + Lot No
Package:According To Per Customers' Require
Delivery time:Tubes will be completed within 30 days, and urgent delivery time can be discussed.

Method of Manufacture.
The pipe shall be manufactured by either the seamless of the electric resistance welding process.
The pipe shall stay as manufactured. However, the cold—finished steel pipe shall be annealed after manufacture.
Dimensional Tolerances
Division Tolerances on outside diameter Tolerances on wall thickness
Hot-finished seamless steel pipe 
40 A or under 【0.5mm Under 4mm
4mm or over
50A or over up to and incl. 125 A 【1%
150A 【1.6mm
200A or over 【0.8%
For the pipe of nominal size 350 A or over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be 【0.5%.
Cold-finished seamless steel pipe and electric resistance welded steel pipe
25 A or under 【0.3mm
Under 3mm
3mm or over

Chemical Composition
Letter symbol of gradeChemical Composition %
STPG3700.25 max. 0.35 max.0.30 ~0.900.040 max. 0.040 max. 
Mechanical Properties
Letter symbol of gradeMechanical Properties
Tensile strengthYield strengthElongation %
kgf/m㎡  {N/ m㎡} kgf/m㎡  {N/ m㎡} No.11 and No.12 test piecesNo. 5 test piecesNo. 4 test piece
Longitudinal TransverseLongitudinalTransverse
STPG370 38 {373}min 22{216} min30 min 25 min23 min28 min

The IS G3454 STPG370 Carbon Steel Pipes shall be practically straight, and its both ends shall be at a right angle to its axis.
The inside and outside surfaces of the IS G3454 STPG370 Carbon Steel Pipes shall be well-finished and free form defects that are detrimental to practical use.
Chemical analysis
Tensile Test
Flattening Test
Bending Test
Hydrostatic Test of Nondestructive Examination
The pipe may be determined for final acceptance by a retest specified in 4.4 in JIS G 0303.



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Add: Guangdong Province, China TianHe District, GuangZhou Num 899