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
| Steel | 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 |
| STH31 | 0.35-0.40 | 0.10-0.50 | 1.20-1.50 | <0.030 | <0.030 | 0.50-1.00 | 0.30-0.60 | 0.15-0.25 |