JIS G3454 Standard Specification
JIS G3454 carbon steel pipes are designed for use under pressure conditions where the maximum temperature does not exceed 350°C. For applications requiring higher pressure, it is recommended to consider the JIS G3455 standard. These steel pipes can be manufactured as either seamless or resistance-welded types, and buyers have the option to specify quality requirements based on hot or cold working conditions.
Chemical Composition:
| Grade Letter Symbol | Chemical Composition (%) | ||||
|---|---|---|---|---|---|
| C | Si | Mn | P | S | |
| STPG 370 | 0.25 max. | 0.35 max. | 0.30–0.90 | 0.040 max. | 0.040 max. |
| STPG 410 | 0.30 max. | 0.35 max. | 0.30–1.00 | 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:
| Category | Tolerances on Outside Diameter | Tolerances on Wall Thickness |
|---|---|---|
| Hot-finished Seamless Steel Pipe | Up to 40A: 0.5mm | Under 4mm: ±0.6mm / -0.5mm |
| 50A to 125A: 1% | 4mm and above: +15% / -12.5% | |
| 150A: 1.6mm | ||
| 200A and above: 0.8% For pipes with nominal size 350A and above, diameter tolerance may be measured by circumference length, in which case the tolerance is 0.5%. |
||
| Cold-finished Seamless and Electric Resistance Welded Pipes | Up to 25A: 0.3mm | Under 3mm: 0.3mm 3mm and above: 10% |
| 32A and above: 0.8% For pipes with nominal size 350A and above, diameter tolerance may be measured by circumference length, in which case the tolerance is 0.5%. |
The JIS G3454 standard ensures that carbon steel pipes meet strict quality and performance requirements for a variety of industrial applications. It provides detailed specifications for chemical composition, mechanical properties, and dimensional tolerances, ensuring consistency and reliability in manufacturing and usage. Whether used in power generation, oil and gas, or other high-pressure environments, these pipes are engineered to deliver long-term durability and safety.
Product Description
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