JIS G3429 is a Japanese Industrial Standard that specifies the seamless steel tubes used for high-pressure gas cylinders. The standard defines several grades of steel tubes intended for different pressure levels and applications in the manufacturing of gas cylinders. These tubes are typically used for storing and transporting compressed gases such as liquefied petroleum gas (LPG) and other industrial gases.
The grades specified in JIS G3429 include:
STH11: Tubes for structural use.
STH12: Tubes for mechanical and structural use.
STH21: Tubes for high-pressure gas cylinders.
Standards: JIS G3429
Size (mm):
Outer Dimensions: 19.05mm - 114.3mm
Wall Thickness:2.0mm - 14 mm
Length: max 16000mm
Tolerances of JIS G3429 High pressure cylinder pipe
| Manufacturing Method | Size Range | Allowable Outside Diameter Deviation (%) | Allowable Wall Thickness Deviation (%) | |
| General Class | High Class | |||
| Hot Rolling (Hot Expanding) | D ＜ 339.7 mm | ± 1 | 2.5 | ± 10 |
| D ≥ 339.7 mm | 2.5 | 2.5 | ||
| Cold Rolling (Cold Drawing) | Total | ± 0.75 | ± 10 | ± 7.5 |
Note: the tolerance is not available for WT＜5.6mm tubes
The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.
STH11 High Pressure Cylinder Tube
GNEE mainly produces and deals in carbon steel pipes and alloy steel pipes. Our pipes include liquid conveying pipes, structural pipes, hydraulic support pipes, boiler pipes and bearing pipes. We usually have more than 5,000 tons of pipes in various sizes and standards. Our stock pipe sizes range from 20mm to 406mm outer diameter and 2mm to 70mm wall thickness.
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