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JIS G3457--Arc welded carbon steel pipes.
This Japanese Industrial Standard specifies the arc welded carbon steel pipes (hereafter referred to as“pipes”) used for piping for steam, water, gas, air, etc. of comparatively low working pressure.
Elongation of pipes with a wall thickness under 8mm，tested using testpiece No.5(perpendicular to pipe axis direction)
Unit:%
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Wall thickness |
Over 5mm up to and incl.6mm |
Over 6mm up to and incl.7mm |
Over 6mm up to and incl.7mm |
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Elongation |
15min |
16min |
18min |
Tolerances on outside diameter and wall thickness
Unit:%
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Item |
Tolerance |
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Tolerance on outside diameter |
±0.5 |
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Tolerance on wall thickness |
Nominal dimameter 450A or under |
+15 -12.5 |
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Nominal diameter over 450A |
+15 -10 |
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Notes a）In this case,either the actually measured value of circumfential length or outside diameter and the circumferential length or outside diameter obtained by conversion thereof shall be used. The mutual conversion of the outside diametre and the circumferential length shall be made by the following equation. D=l/π Where，D:outside diameter（mm）l：circumferential length（mm） π：3.1416 b）For the local parts such as repaired parts，the outside diameter tolerances in this table shall not apply.
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Chemical composition
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Symbol of grade |
C |
P |
S |
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STPY400 |
0.25max |
0.040max |
0.040max |
Mechanical properties
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Symbol of grade |
Base metal |
Tensile strength of weld
N/mm² |
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Tensile strength
N/mm² |
Yield point or proof stress
N/mm² |
Elongation% |
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Tensile test piece |
Tensile test direction |
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Test piece No.5 |
Perpendicular to pipe axis direction a） |
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STPY 400 |
400min |
225min |
18min |
400min |
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NOTE：1N/mm²=1MPA Note：a）A test piece,when taken from the steel strip or steel plate,shall be either in parallel to or perpendicular to the rolling direction. |
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