JIS G3429 Seamless steel tubes

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JIS G3429 seamless steel tubes are used for the manufacture of seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.
Application: Seamless Steel Tubes in High Pressure Gas Cylinder
Standards: JIS G3429
Size range (mm):
  • Outer Dimensions: 19.05mm ~ 114.3mm
  • Wall Thickness:2.0mm ~ 14 mm
  • Length: max 16000mm
The main products of steel / steel grade:
  • JIS G3429 STH11
  • JIS G3429 STH12
  • JIS G3429 STH21
  • JIS G3429 STH22
Packing:
  • Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
  • Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
Delivery:
  • Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
  • Weight of bundle-up to 5000 kg upon request of customer.
  • Each bundle is furnished with three tags.
Chemical Compositions(%)
GradeCSiMnPSNiCrMo
STH11≤0.500.10-0.35≤1.80≤0.035≤0.035///
STH120.30-0.410.10-0.351.35-1.70≤0.030≤0.030///
STH210.25-0.350.15-0.350.40-0.90≤0.030≤0.030≤0.250.80-1.200.15-0.30
STH220.33-0.380.15-0.350.40-0.90≤0.030≤0.030≤0.250.80-1.200.15-0.30

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.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube.


The tubes shall be free from defects detrimental to practical use.

Seamless steel tubes for high pressure gas cylinder.

This should be marked out in the contract after negotiated by the two parties. The amount of steel tubes shorter than 4000 mm should not exceed five percent of your total number of delivered seamless steel pipe for gas cylinder. The two end surface should be perpendicular to the steel pipe axis. The cutting burrs should be took off.

Standards JIS G3429 standard is typically applicable for gas cylinder steel tubing. We can manufacture the following grade of seamless steel pipe for gas cylinder: 37Mn, 34Mn2V, 30CrMo, 35CrMo, STH11, STH12, STH21, STH22, or anything else.

Manufacturing TechnologyWe adopt hot rolling (hot expanding) or cold rolling (cold drawing) to produce gas cylinder steel replacements.
ApplicationsThis steel tube is mainly appeared to make different associated with gas cylinders, hydraulic cylinders and other high pressure cylinders. Seamless steel pipe for gas cylinder can also be applicable for Gas main Vehicle (NGV) cylinders, Compressed Natural Gas (CNG) trailers, transportation and storage of compressed hydrogen, as well as technical gases, and also scuba diving and fire extinguisher

Specifications of Seamless Steel Pipe for Gas Cylinder

Dimension Deviation

Manufacturing MethodSize RangeAllowable Outside Diameter Deviation (%)Allowable Wall Thickness Deviation (%)
General ClassHigh Class
Hot Rolling (Hot Expanding)D ＜ 339.7 mm± 1＋ 12.5 － 10± 10
D ≥ 339.7 mm＋ 15 － 12.5＋ 12.5 － 10
Cold Rolling (Cold Drawing)Total± 0.75± 10± 7.5

Manufacturing MethodSize RangeAllowable Outside Diameter Deviation (%)Min. Allowable Wall Thickness Deviation (%)
General ClassHigh Class
Hot Rolling (Hot Expanding)D＜ 339.7 mm± 1＋25 0＋22.5 0
D ≥ 339.7 mm＋30 0＋25 0
Cold Rolling (Cold Drawing)Total± 0.75＋22.5 0＋15 0

Advantages

  • JST seamless steel pipe for gas cylinder has good surface quality. There does not visible crack, wrinkling, abscission layer and rolling skin (scarring).
  • Inside of production process, there always exist some surface quality defects, regarding flaw, scar, laceration, rolling burr other people. We possess UNICORN ultrasonic joint inspection machine, automatic ultrasonic testing machine and magnetic flux leakage testing host. They are used for detecting obvious surface defects of gas cylinder steel tubes.
  • Iwowwee also employs professional inspection personnel may detect the unobvious inner and outer surface defects on the seamless steel pipe for gas tank. If find any flaw, they will be sufficient polishing, removal, repair too series of processes in keeping with relevant regulations.
  • Delivery StatusHot-rolled steel tubes are delivered in hot-rolled state while cold-rolled steel pipes are delivered in cold-rolled, normalizing or annealing state.

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