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

• Standard & Grade: JIS G3454 STPG 370

• Outer Diameter: 13.7 – 914.4 mm (⅟₄ – 36 in)

• Wall Thickness: 1.0 – 30 mm

• Length: 1 – 12 m (or per customer requirement)

• Manufacturing: Seamless (hot-rolled or cold-drawn)

• Service Temperature: ≤ 350 °C

Chemical Composition

• STPG 370 & STPG 410 compositions as per JIS G3454

• ASTM A106 Gr B chemistry from ASTM A106 specification

• GB/T 8163 20# chemistry per Chinese standard

• EN 10305-1 E235 typical composition for seamless pressure tubes

Mechanical Properties

• JIS values from JIS G3454 mechanical tables

• ASTM A106 Gr B properties per ASTM A106 Grade B

• GB/T 8163 20# values per GB/T 8163 testing requirements

Key Features

• High Pressure Capability: Engineered for safe operation under high internal pressures.

• Excellent Toughness: Good impact resistance and ductility at room temperature and elevated service temperatures.

• Uniform Quality: Seamless manufacturing ensures consistent wall thickness and minimal defects.

• Corrosion Resistance: Basic resistance to general corrosion; can be coated or lined for more aggressive environments.

Applicable Standards

• JIS G3454: Carbon Steel Tubes for Pressure Service (Japan)

• ASTM A106/A53: Seamless Carbon Steel Pipes for High-Temperature Service (USA)

• GB/T 8163: Seamless Steel Tubes for Fluid Transportation (China)

• 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:

• Oil & Gas: High-pressure conveyance lines, wellhead assemblies.

• Power Generation: Boiler tubes, superheater assemblies.

• Chemical Processing: Reactor feed lines, pressure vessels.

• Petrochemical: High-temperature process piping, hydrocarbon transport.

• Water & Steam: High-pressure water pipes, district heating systems.