JIS G3454 Standard Specification

The JIS G3454 standard specifies carbon steel pipes designed for use under pressure conditions where the maximum temperature is limited to 350Â°C. For applications requiring higher pressure, the JIS G3455 standard should be considered. These steel pipes can be manufactured in either seamless or resistance-welded forms, and buyers may specify the required quality based on hot- or cold-working conditions.

Chemical Composition:

Grade Letter Symbol Elongation (%)

C Si Mn P S

STPG 370 0.25 max. 0.35 max. 0.30â€“0.90 0.040 max. 0.040 max.

STPG 410 0.30 max. 0.35 max. 0.30â€“1.00 0.040 max. 0.040 max.

Mechanical Properties:

Grade Letter Symbol Tensile Strength Yield Point or Proof Stress Elongation (%)

kgf/mmÂ² {N/mmÂ²} kgf/mmÂ² {N/mmÂ²} 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: 0.5 mm Under 4 mm: Â±0.6 mm / -0.5 mm

50A or over up to and including 125 A: 1% For 4 mm or over: +15% / -12.5%

150A: 1.6 mm

200A or over: 0.8%
For nominal size 350A or above, outside diameter tolerance can be determined by measuring the circumference length, with a tolerance of 0.5%.

Cold-Finished Seamless and Electric Resistance Welded Pipes 25A or under: 0.3 mm Under 3 mm: 0.3 mm
3 mm or over: 10%

32A or over: 0.8%
For nominal size 350A or above, outside diameter tolerance can be measured via circumference length, with a tolerance of 0.5%.

This standard ensures that carbon steel pipes meet strict quality and performance requirements, making them suitable for a wide range of industrial applications. Proper adherence to these specifications guarantees safe and reliable operation under specified operating conditions. Always consult the latest version of the JIS G3454 standard for detailed technical information and updates.
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Grade Letter Symbol	Elongation (%)
Grade Letter Symbol	C	Si	Mn	P	S
STPG 370	0.25 max.	0.35 max.	0.30â€“0.90	0.040 max.	0.040 max.
STPG 410	0.30 max.	0.35 max.	0.30â€“1.00	0.040 max.	0.040 max.

Grade Letter Symbol	Tensile Strength	Yield Point or Proof Stress	Elongation (%)
	kgf/mmÂ² {N/mmÂ²}	kgf/mmÂ² {N/mmÂ²}	No.11 and No.12 Test Pieces	No. 5 Test Pieces	No. 4 Test Piece
	kgf/mmÂ² {N/mmÂ²}	kgf/mmÂ² {N/mmÂ²}	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

Division	Tolerances on Outside Diameter	Tolerances on Wall Thickness
Hot-Finished Seamless Steel Pipe	40 A or under: 0.5 mm	Under 4 mm: Â±0.6 mm / -0.5 mm
	50A or over up to and including 125 A: 1%	For 4 mm or over: +15% / -12.5%
	150A: 1.6 mm
	200A or over: 0.8% For nominal size 350A or above, outside diameter tolerance can be determined by measuring the circumference length, with a tolerance of 0.5%.
Cold-Finished Seamless and Electric Resistance Welded Pipes	25A or under: 0.3 mm	Under 3 mm: 0.3 mm 3 mm or over: 10%
Cold-Finished Seamless and Electric Resistance Welded Pipes	32A or over: 0.8% For nominal size 350A or above, outside diameter tolerance can be measured via circumference length, with a tolerance of 0.5%.	Under 3 mm: 0.3 mm 3 mm or over: 10%