Technical features of using JIS G3458 standard pipes
The Japanese Industrial Standard JIS G3458 establishes stringent requirements for seamless alloy steel pipes intended for high-temperature service. Products supplied by EV Group China are focused on critical components of power equipment: high-pressure steam pipelines, heat exchanger circuits, boiler installations, and superheated medium transport systems. The standard covers steel grades STPA 12, STPA 20, STPA 22, STPA 23, STPA 24, STPA 25, and STPA 26, ensuring the stability of mechanical properties under prolonged thermal loads.
| Steel Grade | Recommended Heat Treatment |
|---|---|
| STPA 12 | Subcritical annealing, isothermal annealing, full annealing, normalizing, or normalizing and tempering |
| STPA 20 | Subcritical annealing, isothermal annealing, full annealing, normalizing, or normalizing and tempering |
| STPA 22 | Subcritical annealing, isothermal annealing, full annealing, normalizing, or normalizing and tempering |
| Subcritical annealing, isothermal annealing, full annealing, or normalizing and tempering | |
| STPA 23 | Subcritical annealing, isothermal annealing, full annealing, or normalizing and tempering |
| STPA 24 | Subcritical annealing, isothermal annealing, full annealing, or normalizing and tempering |
| Isothermal annealing, full annealing, or normalizing and tempering | |
| STPA 25 | Isothermal annealing, full annealing, or normalizing and tempering |
| STPA 26 | Isothermal annealing, full annealing, or normalizing and tempering |
Expert notes on standardization
- EV Group China ensures compliance with additional quality requirements for rolled products according to Appendix 1 of the standard, if specified by the customer’s technical specifications.
- This standard is a modified (MOD) equivalent of the international standard ISO 9329-2:1997, which regulates the supply of seamless steel pipes for high-temperature service.
- The correspondence of equivalence degrees (IDT, MOD, NEQ) is determined in accordance with ISO/IEC directives, ensuring full compatibility of EV Group China products with international engineering projects.