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Company News About JIS G3454 Steel Pipe Factory
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JIS G3454 Steel Pipe Factory

2024-12-18
Latest company news about JIS G3454 Steel Pipe Factory
standards/code available specifications (nominal diameter) manufacturing
method (raw pipe)
JIS G3454
stpg		 20a~400a
15a~650a		 seamless
erw
(including hot finishing)

main features and applications

1) used for the transportation of water, air, steam, oil, gas, and other fluids at temperatures up to approximately 350°c.

2) available in two strength grades of 370 and 410, and in schedule nos. (pipe thickness) of 10, 20, 30,40, 60, and 80.

 

chemical composition:

 

letter symbol of grade elongation %
c si mn p s
stpg 370 0.25 max. 0.35 max. 0.30 to 0.90 0.040 max. 0.040 max.
stpg 410 0.30 max. 0.35 max. 0.30 to 1.00 0.040 max. 0.040 max.

 

mechanical property:

 

letter symbol of grade tensile strength yield point or proof stress elongation %
kgf/mm2 {n/mm2} kgf/mm2 {n/mm2} no.11 and no.12 test pieces no. 5 test pieces no. 4 test piece
longitudinal transverse longitudinal transverse
stpg 370 38 {373}min 22{216} min 30 min 25 min 23 min 28 min
stpg 410 42{412}min 25{245} min 25 min 20 min 19 min 24 min

tolerances on outside diameter and wall thickness:

division tolerances on outside diameter tolerances on wall thickness
hot-finished seamless steel pipe 40 a or under 0.5mm under 4mm
50a or over up to and incl. 125 a 1%

+0.6mm

 

-0.5mm

 

4mm or over

 

+15%

 

-12.5%
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
0.3mm

 

3mm or over
10%

32 a 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%.

 

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