Applied to flue gas desulfurization (FGD) systems, gas treatment facilities, and other equipment exposed to highly corrosive environments.
Grades
Super Austenite
Stainless
Austenite stainless with Mo ≥ 6% and a PREN ≥ 40 offers
superior chloride corrosion resistance and lower yield strength
compared to duplex stainless.
Grades
- S31254 (254SMO)
- N08925
- S32050
- N08904 (904L)
- N08932
- S32053
- N08367 (AL-6XN)
- S31266
- S32654
- N08926
- S31277
- S34565
Applications
Applied to FPSOs, offshore plants, and other marine facilities requiring excellent corrosion resistance.
Applied to environmental treatment systems, energy-related facilities, and other industrial equipment operating in severe corrosive environments.
Chemical Composition
| International Steel Designation | Chemical Composition Requirements by ASTM, % (Max) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| UNS | ASTM | JIS | EN | C | Cr | Ni | Mo | N | Others |
| N08367 | AL-6XN | SUS 836L | 1.4529 | 0.03 | 20 ~ 22 | 23.5 ~ 25.5 | 6 ~ 7 | 0.18 ~ 0.25 | Cu: 0.75 max |
| N08904 | 904L | SUS 890L | 1.4539 | 0.02 | 19 ~ 23 | 23 ~ 28 | 4 ~ 5 | 0.1 | Cu: 1.0 ~ 2.0 |
| N08925 | 1925hMo / Alloy 925 | - | 1.4529 | 0.02 max | 19.0 ~ 21.0 | 24.0 ~ 26.0 | 6.0 ~ 7.0 | 0.10 ~ 0.20 | Cu: 0.8 ~ 1.5 |
| N08926 | - | - | 1.4529 | 0.02 | 19 ~ 21 | 24 ~ 26 | 6 ~ 7 | 0.15 ~ 0.25 | Cu: 0.5 ~ 1.5 |
| N08932 | - | - | - | 0.02 max | 24.0 ~ 26.0 | 24.0 ~ 26.0 | 4.5 ~ 6.5 | 0.15 ~ 0.25 | Cu: 1.0 ~ 2.0 |
| S31254 | 254SMO | - | 1.4547 | 0.02 | 19.5 ~ 20.5 | 17.5 ~ 18.5 | 6.0 ~ 6.5 | 0.18 ~ 0.25 | Cu: 0.5 ~ 1.0 |
| S31266 | - | - | 1.4465 | 0.02 max | 23.0 ~ 25.0 | 21.0 ~ 24.0 | 5.2 ~ 6.2 | 0.35 ~ 0.60 | W: 1.5 ~ 2.5; Cu: 0.3 ~ 0.8 |
| S31277 | - | - | - | 0.02 max | 20.5 ~ 23.0 | 26.0 ~ 28.0 | 6.5 ~ 8.0 | 0.30 ~ 0.40 | Cu: 0.5 ~ 1.5 |
| S32050 | - | - | - | 0.03 max | 22.0 ~ 24.0 | 20.0 ~ 23.0 | 6.0 ~ 6.8 | 0.21 ~ 0.32 | Cu: 0.40 max |
| S32053 | - | SUS 836L | - | 0.03 max | 22.0 ~ 24.0 | 24.0 ~ 26.0 | 5.0 ~ 6.0 | 0.17 ~ 0.22 | - |
| S32654 | - | - | 1.4652 | 0.02 | 24 ~ 25 | 21 ~ 23 | 7 ~ 8 | 0.45 ~ 0.55 | Cu: 0.30 ~ 0.60 |
| S34565 | - | - | 1.4565 | 0.03 | 23 ~ 25 | 16 ~ 18 | 4 ~ 5 | 0.4 ~ 0.6 | Cb 0.10 max; Mn 5.0 ~ 7.0 |