AL-6XN Round Bar (UNS N08367)
AL-6XN is a low carbon, high purity, nitrogen bearing super austenitic stainless steel with 6.3 % molybdenum and 24 % nickel. It was developed as a seawater resistant material and offers pitting and crevice corrosion resistance comparable to nickel-base alloys such as Inconel 625 in many chloride environments, along with high strength, excellent toughness and good weldability.
Nexforge Alloys supplies AL-6XN round bars in the solution annealed condition to ASTM B691 / ASME SB691. Every bar is traceable to its heat and is certified with chemical analysis, mechanical properties and hardness; ASTM G48 pitting and ASTM A262 intergranular corrosion tests are available on request.
AL-6XN (UNS N08367, W.Nr. 1.4529 equivalent) round bars from 6 mm to 250 mm diameter, solution annealed as per ASTM B691 / ASME SB691, PREN ≥ 43.
AL6XN Round Bar Specification
| Parameter | Details |
|---|---|
| Alloy Designations | AL-6XN, UNS N08367, 6Mo super austenitic stainless steel |
| Standards | ASTM B691, ASME SB691, ASTM A276 / A479 (N08367), ASME Code Case 1997 |
| Size Range | 6 mm to 250 mm diameter |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Solution annealed at 1105 °C minimum and water quenched |
| Surface Finish | Peeled, centreless ground, bright, rough turned |
| Tolerance | h9 / h10 / h11 or as per drawing |
| Testing | Chemical, tensile, hardness, ASTM G48, ASTM A262, UT on request |
| Certification | EN 10204 3.1 mill test certificate |
Chemical Composition (% by weight)
| Element | C | Mn | Si | P | S | Cr | Ni | Mo | N | Cu | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AL-6XN (N08367) | 0.030 max | 2.00 max | 1.00 max | 0.040 max | 0.030 max | 20.0 - 22.0 | 23.5 - 25.5 | 6.00 - 7.00 | 0.18 - 0.25 | 0.75 max | Balance |
Mechanical Properties
| Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Hardness (max) | PREN | Density |
|---|---|---|---|---|---|---|
| Solution annealed | 655 MPa (95 ksi) | 310 MPa (45 ksi) | 30 % | 240 HB | ≥ 43 | 8.06 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Immune to chloride stress corrosion cracking under normal process conditions
- Pitting and crevice corrosion resistance close to nickel-base alloys at lower cost
- High nitrogen content gives strength about 50 % above 316L
- Excellent toughness and ductility at cryogenic temperatures
Applications
- Seawater and brackish water pump shafts, valve stems and fasteners
- Chemical process equipment handling chlorides and mixed acids
- Pharmaceutical, food and beverage process components
- Desalination, reverse osmosis and power plant condenser systems
- Offshore and marine hardware