JIS G3454 Carbon Steel Pipe
Applications JIS G3454 carbon steel pipe is commonly used for pressure service, high-pressure service and high temperature platform. It is typically used from the pressure piping with the temperature of below 350℃. This carbon steel tube is also applied in boiler, electric power, machinery, gas tank, chemical engineering, offshore and petroleum engineering, etc.
Mechanical Properties of JIS G3454 Carbon Steel 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:
1. 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. (%) | ||||||
| ＞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 |
| NO.5 Sample | 25 | 24 | 22 | 20 | 19 | 18 | 16 | |
| STPG410 | NO.12 Sample | 25 | 24 | 22 | 20 | 19 | 18 | 16 |
| NO.5 Sample | 20 | 18 | 17 | 16 | 14 | 12 | 11 | |
Chemical Composition of JIS G3454 Carbon Steel Tube (Unit: %)
| 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
| 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:
1. 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%).
2. For the repaired parts, confirm the wall thickness tolerance meets the above table. The outer diameter tolerance is not applicable to the table.
3. 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.
4. Size and Weight of Carbon Steel Pipe
JIS Pipe dimension
| Nominal size | Outside
diameter (mm) |
Carbon steel
pipes for ordinary piping <SGP> (JIS G3452) |
Carbon steel pipes for pressure service
<STPG>(JIS G3454) |
||||||
| Nominal thickness | |||||||||
| A | B | Thickness (mm) | Sch10 | Sch20 | Sch30 | Sch40 | Sch60 | Sch80 | |
| 6 | 1/8 | 10.5 | 2.0 | – | – | – | 1.7 | 2.2 | 2.4 |
| 8 | 1/4 | 13.8 | 2.3 | – | – | – | 2.2 | 2.4 | 3.0 |
| 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 | 34.0 | 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 | 6.0 | 7.0 |
| 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 | 7.0 | 8.1 |
| 100 | 4 | 114.3 | 4.5 | – | 4.9 | – | 6.0 | 7.1 | 8.6 |
| 125 | 5 | 139.8 | 4.5 | – | 5.1 | – | 6.6 | 8.1 | 9.5 |
| 150 | 6 | 165.2 | 5.0 | – | 5.5 | – | 7.1 | 9.3 | 11.0 |
| 200 | 8 | 216.3 | 5.8 | – | 6.4 | 7.0 | 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 | 19.0 |
| 400 | 16 | 406.4 | 7.9 | 6.4 | 7.9 | 9.5 | 12.7 | 16.7 | 21.4 |
