JIS G3454 Standard Specifications
The JIS G3454 standard specifies carbon steel pipes designed for use under pressure conditions where the maximum temperature is limited to 350°C. If higher pressure applications are required, it's recommended to consider the JIS G3455 standard instead. These steel pipes can be manufactured in either seamless or resistance-welded forms, and buyers may specify quality requirements based on whether the pipes will be used in hot or cold working conditions.
Chemical Composition:
| Grade Letter Symbol | Chemical Elements (%) | ||||
|---|---|---|---|---|---|
| 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. |
Mechanical Properties:
| Grade Letter Symbol | Tensile Strength | Yield Point or Proof Stress | Elongation (%) | |||
|---|---|---|---|---|---|---|
| kgf/mm² {N/mm²} | kgf/mm² {N/mm²} | 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:
| Classification | Tolerances on Outside Diameter | Tolerances on Wall Thickness |
|---|---|---|
| Hot-Finished Seamless Steel Pipe | 40A or below: 0.5mm | Below 4mm: ±0.6mm / -0.5mm |
| 50A and above up to 125A: 1% | For wall thickness of 4mm and above: +15% / -12.5% | |
| 150A: 1.6mm | ||
| 200A and above: 0.8%. For nominal sizes 350A and above, diameter tolerances can be measured by circumference length, with a tolerance of 0.5%. | ||
| Cold-Finished Seamless and Electric Resistance Welded Pipes | 25A or below: 0.3mm | Below 3mm: 0.3mm; 3mm and above: 10% |
| 32A and above: 0.8%. For nominal sizes 350A and above, diameter tolerances can be measured by circumference length, with a tolerance of 0.5%. |
These specifications ensure that the steel pipes meet strict quality and performance standards, making them suitable for various industrial applications. Understanding the chemical composition, mechanical properties, and dimensional tolerances is essential for selecting the right pipe for specific engineering needs.
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