Super Austenitic Stainless Steel


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INCOLOY alloys are super alloys that have nickel as the base metal. These alloys have nickel-chromium-iron as the primary constituents. By varying the other elements, these alloys can be designed to resist attack from specific chemical reagents. These alloys exhibit high strength even at high temperatures.

INCOLOY alloy 25-6HN is also known as super-austenitic stainless steel. This alloy contains a higher content of molybdenum and nitrogen. These additions enhance the thermal stability and corrosion resistance of the alloy. Among super austenitic stainless steels, INCOLOY alloy 25-6HN offers higher degree of corrosion resistance and strength.

This datasheet will look into the chemical composition, properties and applications of INCOLOY 25-6HN.

Chemical Composition

The chemical composition of INCOLOY alloy 25-6HN is given in the following table.

Element Content (%)
Iron, Fe 41.3
Nickel, Ni 24.3
Chromium, Cr 20.6
Molybdenum, Mo 6.3
Others Remainder

Physical Properties

The following table discusses the physical properties of INCOLOY alloy 25-6HN.

Properties Metric Imperial
Density 8.02 gm/cm3 0.290 lb/in3

Mechanical Properties

The mechanical properties of INCOLOY alloy 25-6HN are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 552 MPa 80 ksi
Yield strength(annealed) 276 MPa 40 ksi
Elongation at Break 45% 45%
Hardness, Rockwell B 90 90

Other Designations

Some of the designations used to denote INCOLOY alloy 25-6HN are listed below:

UNS N08367 ASTM B 688 ASTM B 691 ASTM B 564 ASTM B 472
ASTM B 676 ASTM B 675 ASTM B 804 ASTM B 366 ASTM B 462
ASTM A240        



Machining of INCOLOY alloy 25-6HN should be done at a slightly lower speed when compared to 316 stainless steel, as it has a high strength.


INCOLOY alloy 25-6HN 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

INCOLOY alloy 25-6HN can be hot worked at temperature ranges of 982-1232°C (1800-2250°F).


INCOLOY alloy 25-6HN should be annealed at temperatures greater than 1121°C (2050°F).


The INCOLOY alloy 25-6HN 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.




Supply Form



Thickness?0.40-4.75mm?General Width?1000?1219?1500mm

Whole Coil or piece of it

Cold Annealed?Surface 2B?2E


Thickness?4.76-60mm?Width?1500?2000?2500mm?Length?3000?6000?8000?8500mm?Under 10mm plate can be coiled?

Whole Coil or piece of it

Single hot rolling?Solid solution annealed state?Surface 1D



Whole Coil or Specified size

Cold Annealed?Surface 2B?2E

Bar & Rod

Rolled barΦ5-45mm?Length≤1500mm

Polished Bar?circle?Square?

Solution annealing,descaling

Forged barΦ26-245mm?Length≤4000mm

Weld tube

Outer diameterΦ4.76-135mm?Wall Thickness0.25-4.00mm?Length?≤35000 mm

Base on your requirement

Use for PHE

Seamless Tube

Outer diameterΦ3-114mm?Wall Thickness0.2-4.5mm

Base on your requirement

Use for PHE


Outer diameterΦ0.1-13mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Forged piece

roundness and square alloy

Base on your requirement

Steel, Alloy


All kinds of Flangs

Base on your requirement

Steel, Alloy

Welding Material

Coil wire Φ0.90mm/1.2mm/1.6mm

Base on your requirement

Certificate of Origin?America, Sweden, Britain, Germany, Austria, Italy, France.

Straight WireΦ1.2mm/1.6mm/2.4mm/3.2mm/4.0mm

Welding rodΦ2.4mm/3.2mm/4.0mm


Elbow, three links, four links, different diameter size

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Explosive bonded laminate

Raw Sheet Thickness≥2mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

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