AL-6XN Stainless Steel
AL-6XN is a high molybdenum super austenitic stainless steel containing 6.3% molybdenum, 23.5% to 25.5% nickel, 20.0% to 22.0% chromium, 6.0% to 7.0% molybdenum, and 0.18% to 0.25% nitrogen. The source describes resistance to pitting, crevice corrosion, and stress corrosion in chloride environments as greater than that of 3 series stainless steel, while its cost is lower than nickel based corrosion resistant alloys. It also lists stable high temperature performance, strength, and toughness for severe corrosive service.
Product details
Chemical composition
| AL-6XN | C | Si | Mn | P | S | Ni | Cr | Cu | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 23.5 | 20.0 | – | 6.0 | 0.18 | – |
| max | 0.03 | 1.0 | 2.0 | 0.04 | 0.03 | 25.5 | 22.0 | 0.75 | 7.0 | 0.25 | Bal |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| AL-6XN | N08367 | 1.4478 | SUS836L | 25-6Mo | X2NiCrMoN25-21-7 |
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Physical properties
| Density g/cm³ | 8.24 |
|---|---|
| Melting range ℃ | 1320-1400 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 13 |
| Specific heat J/kg•℃ | 450 |
| Elastic modulus GPa | 195 |
| Electrical resistivity μΩ•m | 1.0 |
| Linear expansion coefficient a/10-6℃-1 | 15.5 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥650 |
|---|---|
| Yield strength RP0.2 N/mm | ≥295 |
| Elongation % | ≥35 |
| Hardness HB | ≤250 |
| *After solution heat treatment | |
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Applications
- Chemical processing: reactors, piping, and heat exchangers handling chloride-bearing or acidic corrosive media
- Marine engineering: reverse-osmosis seawater-desalination equipment, offshore-platform piping, and condensers exposed to seawater
- Environmental protection: flue gas desulfurization spray towers and waste-incineration equipment exposed to hot, high-chloride conditions
- Oil and gas: offshore production equipment and refinery distillation columns handling sulfur-bearing and acidic media
- Pulp and paper: filter presses, washer drums, and piping in bleaching systems exposed to chlorides
- Pharmaceutical and food processing: high-purity tanks and piping requiring corrosion resistance and cleanliness
- Power generation: seawater-cooling systems in nuclear plants and condensers in thermal power plants requiring long-term corrosion resistance
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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