UNS N08367 is 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.

UNS N08367 Chemical Composition:

NiCrMoCNMnSiPSCuFe
23.5-25.520-226.0- 7.00.03 Max0.18-0.252.00 Max1.00 Max0.040 Max0.030 Max0.75 MaxRem.

UNS N08367 Mechanical Properties:

Temp. °F (°C)Ultimate Tensile Strength, psi0.2% Yield Strength, psiElongation in 2”, percentCharpy V-Notch Toughness, ft-lb
-450 (-268)218,000142,00036353*
-320 (-196)196,000107,0004985
-200 (-129)100
70 (21)108,00053,00047140
200 (93)99,90049,40047
400 (204)903,00040,40046
600 (316)86,00036,30047
800 (427)87,00036,00048

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:

FormStandard
Metal TypeUNS N08367
BarASTM B691 / ASME SB691
WireASTM B691 / ASME SB691
SheetASTM B688, A240 / ASME SB688 SA240
PlateASTM B688, A240 / ASME SB688 SA240
TubeASTM B676 WELDED
PipeASTM B675 WELDED
FittingASTM B366 / ASME SB366 / ASTM B462 /   ASME SB462
ForgingASTM 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

The UNS N08367 is used in the following applications:

Welded tubes for chemical processing plants

Tubes for heat exchangers

Marine applications

In desalination and flue gas desulfurization equipment

Reaction vessels for pharmaceutical vessels.