AL-6XN (UNS N08367 / W.Nr. 1.4529)
AL-6XN alloy (UNS N08367 / W.Nr. 1.4529) is a low carbon, high purity, nitrogen-bearing “super-austenitic” stainless alloy. The AL-6XN alloy was designed to be a seawater resistant material and has since been demonstrated to be resistant to a broad range of very corrosive environments. The high strength and corrosion resistance of the AL6XN alloy make it a better choice than the conventional duplex stainless steels and a cost effective alternative to more expensive nickel-base alloys where excellent formability, weldability, strength and corrosion resistance are essential.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| AL-6XN | – | – | – | N08367 | – | 1.4529 | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N | Fe |
| AL-6XN | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.040 | ≤0.030 | 20.0-22.0 | 23.5-25.5 | 6.0-7.0 | ≤0.75 | 0.18-0.25 | Bal |
Typical Physical and Mechanical Properties (RT, Annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
| 8.0 | 1110-1210 | 552-758 | ≥230 | ≥35 | / |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM A479, ASTM B691, ASTM A194, ASTM B472, ASTM B564 |
| Plate, Sheet and Strip | ASTM A240, ASTM B688 |
| Pipe and Tube | ASTM A358, ASTM A312, ASTM A409, ASTM A813, ASTM A814, ASTM B690 |
| Welding Product | – |
| Others | ASTM B366 |
Features
- Excellent resistance to pitting and crevice corrosion in chloride solutions
- Practical immunity to stress corrosion cracking in NaCl environments
- High strength and toughness
Applications
AL-6XN alloy is well suited for such applications as:
- Chemical process tanks and pipelines
- Process systems for offshore oil and gas platforms
- Condensers, heat exchangers and piping containingseawater or crude oil
- Filter washers, vats and press rolls in pulpbleaching plants
- Power plant flue gas scrubber environments
- Tall oil distillation columns and packing
- Desalination equipment and pumps
- Service water piping systems for nuclearpower plants
- Transformer cases exposed to marine environments • Pharmaceutical equipment (for product purity)
- Food processing equipment
