Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements5 elements | |||
| Fe | Iron | Bal. | |
| Ni | Nickel | 23.5 – 25.5% | |
| Cr | Chromium | 20 – 22% | |
| Mo | Molybdenum | 6 – 7% | |
| N | Nitrogen | 0.18 – 0.25% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| Cu | Copper | ≤ 0.75% | |
| C | Carbon | ≤ 0.03% | |
| Mn | Manganese | ≤ 2% | |
| Si | Silicon | ≤ 1% | |
| P | Phosphorus | ≤ 0.04% | |
| S | Sulphur | ≤ 0.03% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Bar for forging | Forging Quality, all sizes | — | — | — | |
| Forgings | Solution annealed | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Flanges, forged fittings and valve parts | Solution annealed | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Forgings, flanges, fittings and valve parts | Solution annealed | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Bars and shapes (boiler and pressure-vessel use) | Annealed | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | Also specified: Hardness ≤ 241 HBW Hardness ≤241 HBW. |
| Plate, sheet and strip | |||||
| Plate, sheet and strip (≤3/16 in) | Solution annealed | ≥ 690 (100 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Plate, sheet and strip (>3/16 in) | Solution annealed | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Tube and pipe | |||||
| Seamless pipe and tube (wall ≤3/16 in) | Annealed after cold or hot working | ≥ 690 (100 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Seamless pipe and tube (wall >3/16 in) | Annealed after cold or hot working | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Fittings and flanges | |||||
| Fittings (factory-made wrought butt-weld / socket) | 2025 °F [1107 °C], rapid air or water quench | — | — | — | Recommended temperature; tolerance ±15 °C (±25 °F). Tensile properties follow the starting material. No tension test on the finished fitting unless agreed. |
| Fittings (wrought austenitic stainless, butt-weld / socket) | Solution annealed 2025 °F [1107 °C], water quenched or otherwise rapidly cooled | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 28 | Elongation: ≥28% longitudinal, ≥20% transverse. A single temperature is a minimum. All fittings are supplied heat-treated. |
| Several forms | |||||
| Bar, rod and wire | Cold finished and annealed, or hot finished and annealed, all sizes | ≥ 655 (95 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
Where this grade is recommended
Matched in 3 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Seawater piping & HX | Marine & Offshore | 40 – 90 °C | 4 / 11 | 90 |
| Desalination & RO | Marine & Offshore | 45 – 110 °C | 8 / 12 | 88 |
| Flue-gas desulphurisation | Environmental & FGD | 80 – 180 °C | 7 / 11 | 87 |
Designations & equivalents
| Trade name(s) | AL-6XN |
| ASTM / AISI | A182 / A240 / A276 / A403 / A479 / A484 / B366 / B462 / B564 / B688 / B690 / B691 / B804 |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
11 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is AL-6XN · UNS N08367?
AL-6XN · UNS N08367 — Super-austenitic stainless. 6Mo super-austenitic — seawater, bleach and FGD, interchangeable with 254 SMO
What is the maximum service temperature of N08367?
Typically about 400 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N08367?
The specified minimum tensile strength is 690 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover N08367?
ASTM B688, ASTM B690, ASTM B691, ASTM B804, ASTM B564, ASTM B462, ASTM B366, ASTM A240/A240M, ASTM A182/A182M, ASTM A276/A479, ASTM A403/A403M
Where is N08367 typically used?
Seawater piping & HX (Marine & Offshore); Desalination & RO (Marine & Offshore); Flue-gas desulphurisation (Environmental & FGD)
In which forms is N08367 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com