Specification and Purpose of Pipes According to JIS G3459
The Japanese Industrial Standard JIS G3459 defines the technical requirements for seamless and welded corrosion-resistant steel pipes. These products, supplied by EV Group China, are intended for the installation of piping systems operating in aggressive environments, as well as under extreme temperature conditions — from cryogenic to high-temperature processes.
Technical Notes:
Upon agreement with the customer, additional quality requirements reflected in the standard’s appendices can be included in the specification:
- Z2: Yield strength or stress control at elevated temperatures.
- Z3: Ultrasonic Testing (UT).
- Z4: Eddy current testing for structural integrity.
- Z6: Intergranular corrosion resistance testing.
Steel Grade Classification and Heat Treatment Regimes
| Classification | Steel Grade | Pipe Designation | Heat Treatment (Temperature, °C) |
|---|---|---|---|
| Austenitic pipes | SUS 304 | SUS304TP | 1010 min., rapid cooling |
| SUS 304H | SUS304HTP | 1040 min., rapid cooling | |
| SUS 304L | SUS304LTP | 1010 min., rapid cooling | |
| SUS 309 | SUS309TP | 1030 min., rapid cooling | |
| SUS 309S | SUS309STP | 1030 min., rapid cooling | |
| SUS 310 | SUS310TP | 1030 min., rapid cooling | |
| SUS 310S | SUS310STP | 1030 min., rapid cooling | |
| SUS 316 | SUS316TP | 1010 min., rapid cooling | |
| SUS 316H | SUS316HTP | 1040 min., rapid cooling | |
| SUS 316L | SUS316LTP | 1010 min., rapid cooling | |
| SUS 316Ti | SUS316TiTP | 920 min., rapid cooling | |
| SUS 317 | SUS317TP | 1010 min., rapid cooling | |
| SUS 317L | SUS317LTP | 1010 min., rapid cooling | |
| SUS 836L | SUS836LTP | 1030 min., rapid cooling | |
| SUS 890L | SUS890LTP | 1030 min., rapid cooling | |
| SUS 321 | SUS321TP | 920 min., rapid cooling | |
| SUS 321H | SUS321HTP | 1095 cold finish / 1050 hot finish, rapid cooling | |
| SUS 347 | SUS347TP | 980 min., rapid cooling | |
| SUS 347H | SUS347H | 1095 cold finish / 1050 hot finish, rapid cooling | |
| Austenitic-ferritic pipes | SUS 329J1 | SUS329J1LTP | 950 min., rapid cooling |
| SUS 329J3L | SUS329J3LTP | 950 min., rapid cooling | |
| SUS 329J4L | SUS329J4LTP | 950 min., rapid cooling | |
| Ferritic pipes | SUS 430 | SUS430TP | Annealing from 700, slow cooling |
| SUS 409L | SUS409LTP | Annealing from 700, slow cooling | |
| SUS 430LX | SUS430LXTP | Annealing from 700, slow cooling | |
| SUS 430J1L | SUS430J1LTP | Annealing from 700, slow cooling | |
| SUS 436 | SUS436TP | Annealing from 700, slow cooling | |
| SUS 436L | SUS436L | Annealing from 720, slow cooling | |
| SUS 444 | SUS444 | Annealing from 720, slow cooling |