JIS G3454 Tube

What is the JIS G3455 Tube?

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℃. The pipes for high-pressure service shall be by JIS G3455. Standard: JIS G3454 JIS G3455 JIS G3456 Japanese Industrial Standard Uses: For conveying oil, gas, and other fluid.

Mechanical Properties of JIS G3454 Tube

Grade	Tensile Property (N/mm²)	Yield Point or Yield Strength (N/mm²)	Elongation (%)
			NO. 11 Sample; NO. 12 Sample	NO. 5 Sample	NO. 4 Sample
			Longitudinal	Transverse	Longitudinal	Transverse
STPG370	≥ 370	≥ 215	≥ 30	≥ 25	≥ 28	≥ 23
STPG410	≥ 410	≥ 245	≥ 25	≥ 20	≥ 24	≥ 19

Note:

For the carbon steel pipes with the thickness of less than 8 mm, we use NO.12 or NO.5 sample for tensile test. The minimum elongation will be reduced by 1.5% from the table value when the thickness reduces 1 mm. The value obtained will be rounded to an integer value according to JIS Z8401 (a rounding method).

Grade	Sample Shape	Elongation differs according to the wall thickness. (%)
Grade	Sample Shape	＞7-＜8	＞6-＜7	＞5-＜6	＞4-＜5	＞3-＜4	＞2-＜3	＞1-＜2
STPG370	NO.12 Sample	30	28	27	26	24	22	21
STPG370	NO.5 Sample	25	24	22	20	19	18	16
STPG410	NO.12 Sample	25	24	22	20	19	18	16
STPG410	NO.5 Sample	20	18	17	16	14	12	11

Chemical Composition of JIS G3454 Tube

Grade	C	Si	Mn	P	S
STPG370	≤ 0.25	≤ 0.35	0.30-0.90	≤ 0.040	≤ 0.040
STPG410	≤ 0.30	≤ 0.35	0.30-1.00	≤ 0.040	≤ 0.040

Allowable Deviation of Outer Diameter and Wall Thickness JIS G3454

Type	Allowable Deviation of Outer Diameter		Allowable Deviation of Wall Thickness
Hot-Working Seamless Steel Tube	≤ 40A	± 0.5 mm	＜ 4 mm	﹢0.6mm 0.5
	≥ 30A ≤ 125A	± 1%
	150A	± 1.6 mm
	≥ 200A	± 0.8%	≥ 4mm	﹢15% ﹣12.5%
	For ≥350A ones, we can measure according to the perimeter. The allowable deviation is ± 0.5%.
Cold-Working Seamless Steel Pipe and Electric-Resistance Welded Steel Pipe	≤ 25A	± 0.03 mm	＜ 3 mm ≥ 3 mm	± 0.3 mm ± 10%
	≥ 32A	± 0.8%
	For ≥350A ones, we can measure according to the perimeter. The allowable deviation is ± 0.5%.

Note:

When we measure the outer diameter through perimeter, we can determine by converting circumference measurement or measured value to be the outer diameter. Both are applicable to the same tolerance (± 0.5%).
For the repaired parts, confirm the wall thickness tolerance meets the above table. The outer diameter tolerance is not applicable to the table.
The appearance of carbon steel pipes used below 350℃ is regulated by the following provisions:
(1) The carbon steel tube should be straight with practicality. Its ends must be perpendicular to the tube axis.
(2) The inner and outer of tube should be processed well without harmful defects.
Size and Weight of Carbon Steel Pipe

Dimension of JIS G3454 Tube

Nominal size		Outside diameter (mm)	Carbon steel	Carbon steel pipes for pressure service
			pipes for ordinary	<STPG>(JIS G3454)
			piping <SGP>
			(JIS G3452)	Nominal thickness
A	B		Thickness (mm)	Sch10	Sch20	Sch30	Sch40	Sch60	Sch80
6	1/8	10.5	2	–	–	–	1.7	2.2	2.4
8	1/4	13.8	2.3	–	–	–	2.2	2.4	3
10	3/8	17.3	2.3	–	–	–	2.3	2.8	3.2
15	1/2	21.7	2.8	–	–	–	2.8	3.2	3.7
20	3/4	27.2	2.8	–	–	–	2.9	3.4	3.9
25	1	34	3.2	–	–	–	3.4	3.9	4.5
32	1.1/4	42.7	3.5	–	–	–	3.6	4.5	4.9
40	1.1/2	48.6	3.5	–	–	–	3.7	4.5	5.1
50	2	60.5	3.8	–	3.2	–	3.9	4.9	5.5
65	2.1/2	76.3	4.2	–	4.5	–	5.2	6	7
80	3	89.1	4.2	–	4.5	–	5.5	6.6	7.6
90	3.1/2	101.6	4.2	–	4.5	–	5.7	7	8.1
100	4	114.3	4.5	–	4.9	–	6	7.1	8.6
125	5	139.8	4.5	–	5.1	–	6.6	8.1	9.5
150	6	165.2	5	–	5.5	–	7.1	9.3	11
200	8	216.3	5.8	–	6.4	7	8.2	10.3	12.7
250	10	267.4	6.6	–	6.4	7.8	9.3	12.7	15.1
300	12	318.5	6.9	–	6.4	8.4	10.3	14.3	17.4
350	14	355.6	7.9	6.4	7.9	9.5	11.1	15.1	19
400	16	406.4	7.9	6.4	7.9	9.5	12.7	16.7	21.4

Application of JIS G3454 Tube

Pressure service
High-pressure service and high temperature platform
Boiler or electric power
Machinery
Gas tank
Chemical engineering
Offshore and oil engineering

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