UNS N08367/AL-6XN/25-6HN Stainless Steel
UNS N08367 is a type of high Molybdenum containing super austenitic stainless steel that has nickel as the base metal. This alloy has nickel-chromium-iron as the primary constituents. By varying the other elements, it can be designed to resist attacks from specific chemical reagents. This alloy exhibits high strength even at high temperatures. 6% Mo, high Ni, and N alloyed austenitic grade with extremely high resistance to both uniform and localized corrosion. Commonly used in applications to withstand chlorinated sea water and also used in flue gas cleaning.
UNS N08367 Chemical Composition:
| Ni | Cr | Mo | C | N | Mn | Si | P | S | Cu | Fe |
| 23.5-25.5 | 20-22 | 6.0- 7.0 | 0.03 Max | 0.18-0.25 | 2.00 Max | 1.00 Max | 0.040 Max | 0.030 Max | 0.75 Max | Rem. |
UNS N08367 Mechanical Properties:
| Temp. °F (°C) | Ultimate Tensile Strength, psi | 0.2% Yield Strength, psi | Elongation in 2”, percent | Charpy V-Notch Toughness, ft-lb |
| -450 (-268) | 218,000 | 142,000 | 36 | 353* |
| -320 (-196) | 196,000 | 107,000 | 49 | 85 |
| -200 (-129) | – | – | – | 100 |
| 70 (21) | 108,000 | 53,000 | 47 | 140 |
| 200 (93) | 99,900 | 49,400 | 47 | – |
| 400 (204) | 903,000 | 40,400 | 46 | – |
| 600 (316) | 86,000 | 36,300 | 47 | – |
| 800 (427) | 87,000 | 36,000 | 48 | – |
UNS N08367 is also known as super-austenitic stainless steel. This alloy contains a higher content of Molybdenum and Nitrogen (so it is also called 6% Mo Super Austenitic Stainless Alloy, AL-6XN, NAS 254NM, INCOLOY alloy 25-6HN, F62). These additions enhance the thermal stability and corrosion resistance of the alloy. Among super austenitic stainless steels, UNS N08367 offers a higher degree of corrosion resistance and strength.
UNS N08367 Specifications:
| Form | Standard |
| Metal Type | UNS N08367 |
| Bar | ASTM B691 / ASME SB691 |
| Wire | ASTM B691 / ASME SB691 |
| Sheet | ASTM B688, A240 / ASME SB688, SA240 |
| Plate | ASTM B688, A240 / ASME SB688, SA240 |
| Tube | ASTM B676 WELDED |
| Pipe | ASTM B675 WELDED |
| Fitting | ASTM B366 / ASME SB366 / ASTM B462 / ASME SB462 |
| Forging | ASTM B472 / ASTM B462 / ASME SB462 |
Machinability
Machining of UNS N08367 should be done at a slightly lower speed when compared to 316 stainless steel, as it has high strength.
Welding
UNS N08367 can be welded by shielded metal arc welding, gas tungsten arc welding, submerged arc welding, plasma arc welding and gas metal arc welding. The filler metal and electrodes are usually made of INCONEL alloy.
Hot-working
UNS N08367 can be hot worked at temperature ranges of 982-1232°C (1800-2250°F).
Annealing
UNS N08367 should be annealed at temperatures greater than 1121°C (2050°F).
Applications
In applications to withstand chlorinated sea water
Flue gas cleaning
Process equipment in chemical industry
Bleaching equipment in the pulp and paper industry
Desalination
Seawater handling
Hydrometallurgy
Food and beverage
Pharmaceuticals
Heat exchangers
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