JIS · JIS G3429

JIS G3429 Standard: Seamless Pipes for High-Pressure Cylinders

Specification and Purpose of the Standard

This Japanese Industrial Standard (JIS G3429) specifies the technical requirements for seamless steel pipes intended for the manufacture of high-pressure vessels (gas cylinders). The regulation covers products used in production, in accordance with the provisions of JIS B 8230 and JIS B 8241. EV Group China specialists ensure the supply of rolled steel that strictly complies with these characteristics, guaranteeing the reliability of products during operation under high pressure.

Technical Notes:

  • All physical and chemical indicators specified in brackets {} comply with the international SI system of units and are provided for reference purposes.
  • The regulatory framework has been updated to reflect the transition to SI metric standards adopted for industrial use.

Chemical Composition of Steel Grades according to JIS G3429

SteelSTH11STH12STH21STH22STH31
C<0.500.30-0.410.25-0.350.33-0.380.35-0.40
Si0.10-0.350.10-0.350.15-0.350.15-0.350.10-0.50
Mn<1.801.35-1.700.40-0.900.40-0.901.20-1.50
P<0.035<0.030<0.030<0.030<0.030
S<0.035<0.030<0.030<0.030<0.030
Ni--<0.25<0.250.50-1.00
Cr--0.80-1.200.80-1.200.30-0.60
Mo--0.15-0.300.15-0.300.15-0.25