Specifications

JIS G3454 Carbon Steel Pipes for Pressure Service
Grade STPG 370
Grade STPG 410
Grade STPG 38
Grade STPG 42

  

JIS G3454
Carbon Steel Pipes for Pressure Service

1. Scope
This Japanese Industrial Standard specifies the carbon steel pipes, hereinafter referred to as the "pipes", used for pressure service at an approximate maximum temperature of 350°C. The pipes for high pressure service shall be in accordance with JIS G 3455.
Remarks
1.1 Pertaining to the electric-resistance welded steel tubes, when previously agreed upon with the manufacturer, the purchaser may designate the supplementary quality requirements Z 3 or Z 4 specified in Appendix, in addition to the items specified in this text.
Appendix Z 3 Ultrasonic Examination
Appendix Z 4 Eddy Current Examination
2.1 The units and numerical values given in { } in this Standard are based on the international System of Units (SI) and are appended for informative reference.
Further, the traditional units accompanied by numerical values in this Standard shall be converted to the SI units and numerical values on Jan. 1, 1991.

2. Grade and Designation
The pipe shall be classified into two grades and their letter symbols shall be as given in Table 1.

Letter symbol of grade	(Informative reference) Traditional letter symbol of glade
STPG 370	STPG 38
STPG 410	STPG 42

3. Method of Manufacture.
The Method of manufacture shall be as follows:
3.1 The pipe shall be manufactured by either the seamless of the electric resistance welding process.
3.2 (Applicable till the end of 1990) The pipe shall stay as manufactured. However, the cold- finished steel pipe shall be annealed after manufacture. The purchaser may specify heat treatment for the weld of the electric resistance welded steel pipe of grade STPG 42, as necessary.
3.3 When required by the purchaser, the pipe may be furnished with a bevel end

4. Chemical Composition
The pipe shall be tested in accordance with 9.1 and the ladle analysis values obtained shall conform to Table 2.

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.

5. Dimensions, Mass and Dimensional Tolerances
5.1 Dimensions and Mass
The outside diameter, wall thickness and mass of the pipe shall be as specified in this standard.
5.2 Dimensional Tolerances
The tolerances on the outside diameter and wall thickness of the pipe shall conform to Table 3. The length of a pipe shall be 4000mm or over.

Table 3. Tolerances on Outside Diameter and Wall Thickness:

Division	Tolerance on outside diameter			Tolerance on wall thickness
	Outside Diameter		Tolerance	Wall Thickness	Tolerance
Hot-finished seamless steel pipe	40A or under		±0.5mm	Under 4mm	+0.6mm -0.5mm
	50A or over up to 125A		±1mm
	150A		±1.6mm
	200A or over		±0.8mm
	For the pipe of nominal size 350A or over, the tolerance on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be ±0.5%			Over 4mm	+15% -12.5%
Cold-finished seamless steel pipe and electric resistance welded steel pipe	25A or under	±0.3mm		Under 3mm	±0.3mm
	32A or over	±0.8%
	For the pipe of nominal size 350A 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%			3mm or over	±10%