JIS G3454 STPG 370 Carbon Steel Pipes Seamless Steel Pipe For Pressure Service
JIS G3454 STPG 370 Carbon Steel Seamless Pipes for Pressure Service
Material
JIS G3454 STPG 370 pipes are manufactured from low-carbon carbon steel specifically formulated for pressure service. These seamless tubes offer excellent strength and toughness at elevated temperatures—up to 350 °C—and are produced via hot-rolling or cold-drawing processes to ensure uniform microstructure and minimal defects
Specifications
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Standard & Grade: JIS G3454 STPG 370
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Outer Diameter: 13.7 – 914.4 mm (⅟₄ – 36 in)
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Wall Thickness: 1.0 – 30 mm
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Length: 1 – 12 m (or per customer requirement)
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Manufacturing: Seamless (hot-rolled or cold-drawn)
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Service Temperature: ≤ 350 °C
Chemical Composition
| Steel Grade | C (max %) | Si (max %) | Mn (%) | P (max %) | S (max %) |
|---|---|---|---|---|---|
| STPG 370 (JIS) | 0.25 | 0.35 | 0.30 – 0.90 | 0.040 | 0.040 |
| STPG 410 (JIS) | 0.30 | 0.35 | 0.30 – 1.00 | 0.040 | 0.040 |
| A106 Gr B (ASTM) | 0.30 | ≥ 0.10 | 0.29 – 1.06 | 0.035 | 0.035 |
| 20# (GB/T 8163) | 0.07 – 0.24 | 0.17 – 0.37 | 0.35 – 0.65 | 0.035 | 0.035 |
| E235 (EN 10305-1) | ≤ 0.17 | ≤ 0.35 | ≥ 0.04 | 0.025 | 0.025 |
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STPG 370 & STPG 410 compositions as per JIS G3454
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ASTM A106 Gr B chemistry from ASTM A106 specification
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GB/T 8163 20# chemistry per Chinese standard
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EN 10305-1 E235 typical composition for seamless pressure tubes
Mechanical Properties
| Steel Grade | Tensile Strength (min MPa) | Yield Strength (min MPa) | Elongation (min %) |
|---|---|---|---|
| STPG 370 (JIS) | 373 | 216 | 25 |
| STPG 410 (JIS) | 412 | 245 | 20 |
| A106 Gr B (ASTM) | 415 | 240 | 20 |
| 20# (GB/T 8163) | 410 – 550 | 245 | 20 |
| E235 (EN 10305-1) | 315 | 205 | 20 |
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JIS values from JIS G3454 mechanical tables
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ASTM A106 Gr B properties per ASTM A106 Grade B
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GB/T 8163 20# values per GB/T 8163 testing requirements
Key Features
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High Pressure Capability: Engineered for safe operation under high internal pressures.
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Excellent Toughness: Good impact resistance and ductility at room temperature and elevated service temperatures.
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Uniform Quality: Seamless manufacturing ensures consistent wall thickness and minimal defects.
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Corrosion Resistance: Basic resistance to general corrosion; can be coated or lined for more aggressive environments.
Applicable Standards
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JIS G3454: Carbon Steel Tubes for Pressure Service (Japan)
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ASTM A106/A53: Seamless Carbon Steel Pipes for High-Temperature Service (USA)
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GB/T 8163: Seamless Steel Tubes for Fluid Transportation (China)
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EN 10305-1: Seamless Cold-Drawn Steel Tubes (Europe)
Application Fields
Carbon steel seamless pipes of the STPG 370 grade are widely employed in industries where durable, high-pressure tubing is essential. Typical applications include:
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Oil & Gas: High-pressure conveyance lines, wellhead assemblies.
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Power Generation: Boiler tubes, superheater assemblies.
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Chemical Processing: Reactor feed lines, pressure vessels.
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Petrochemical: High-temperature process piping, hydrocarbon transport.
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Water & Steam: High-pressure water pipes, district heating systems.
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