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JIS G3429 Seamless steel tubes for high pressure gas cylinder

Standards: JIS G3429

Size (mm):
  • Outer Dimensions: 19.05mm ~ 114.3mm
  • Wall Thickness:2.0mm ~ 14 mm
  • Length: max 16000mm

Application: Seamless steel tubes for high pressure gas cylinder.

The main products of steel / steel grade:
  • JIS G3429 STH11
  • JIS G3429 STH12
  • JIS G3429 STH21
  • JIS G3429 STH22

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements.

Painting: as requested.

Chemical Compositions(%):
Grade C Si Mn P S Ni Cr Mo
STH11 ≤0.50 0.10-0.35 ≤1.80 ≤0.035 ≤0.035 / / /
STH12 0.30-0.41 0.10-0.35 1.35-1.70 ≤0.030 ≤0.030 / / /
STH21 0.25-0.35 0.15-0.35 0.40-0.90 ≤0.030 ≤0.030 ≤0.25 0.80-1.20 0.15-0.30
STH22 0.33-0.38 0.15-0.35 0.40-0.90 ≤0.030 ≤0.030 ≤0.25 0.80-1.20 0.15-0.30
Outside diameter: 1%
Wall thickness: +30%
Wall thickness disparity: Within 20% of the nominal wall thickness
Length: >+30mm

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.

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