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JIS G3457

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:%

Wall thickness

Over 5mm up to and

incl.6mm

Over 6mm up to and

incl.7mm

Over 6mm up to and

incl.7mm

Elongation

15min

16min

18min

Tolerances on outside diameter and wall thickness

Unit:%

Item		Tolerance
Tolerance on outside diameter		±0.5
Tolerance on wall thickness	Nominal dimameter 450A or under	+15 -12.5
	Nominal diameter over 450A	+15 -10
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.

Chemical composition

Symbol of grade	C	P	S
STPY400	0.25max	0.040max	0.040max

Mechanical properties

Symbol of grade	Base metal				Tensile strength of weld N/mm²
	Tensile strength N/mm²	Yield point or proof stress N/mm²	Elongation%
			Tensile test piece	Tensile test direction
			Test piece No.5	Perpendicular to pipe axis direction a）
STPY 400	400min	225min	18min		400min
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.

JIS G3461

JIS G3456

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