1
Overview
JIS G3454 specifies carbon steel pipes, known as STPG, used for pressure service at an approximate maximum temperature of 350°C. It serves a similar role in Japanese engineering as ASTM A106 does globally.
2
Scope & Applicability
Applies To Industries
General IndustryPower PlantPetrochemical
Covers — carbon steel pressure pipe:
- Grades STPG 370 and STPG 410.
- Working temperatures up to 350°C (660°F).
- Uses the Schedule system for wall thickness (Sch 10, 20, 30, 40, 60, 80).
Does NOT cover (exclusions) — the following are governed elsewhere:
- High-temperature service (>350°C) → JIS G3456 (STPT).
- High-pressure service → JIS G3455 (STS).
3
Key Requirements
STPG provides reliability for process and power applications:
- Materials — allows both seamless and ERW manufacturing.
- Testing — requires hydrostatic or NDE testing to guarantee pressure retention.
4
Technical Details
Unlike SGP, STPG utilizes the Schedule numbering system, allowing engineers to select appropriate wall thicknesses for various pressure applications in standard plant systems.
5
Engineering Notes
While similar to A106, STPG allows ERW (welded) manufacturing, whereas A106 is strictly seamless. If seamless is required, specify STPG-S.
7
Source, Edition & Status
- Publisher
- JIS
- Industries
- General Industry, Power Plant, Petrochemical
- Last Reviewed
- 2026-07-01
- Last Updated
- 2026-07-01
- Verified By
- Engineering content reviewer
- Content Status
- reviewed