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standards/code | available specifications (nominal diameter) | manufacturing |
jis g 3454 | 20a~400a | seamless |
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% | ||
cold-finished seamless steel pipe and electric resistance welded steel pipe | 25 a or under 0.3mm | under 3mm
3mm or over |
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%. |
