Nickel-based super alloy: Incoloy 925 (Alloy 925/UNS N08925)

What is Incoloy 925?

Designated as UNS N08925, Incoloy 925 (also known as “Alloy 925”) is a precipitation-hardenable iron-nickel-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy has outstanding resistance to general corrosion, pitting, crevice corrosion, and stress-corrosion cracking in many aqueous environments, including those containing sulfides and chlorides. Incoloy 925 is used in various applications requiring a combination of high strength and corrosion resistance such as sour gas wells, oil production equipment, surface & down-hole piping components (flanges, valves, fasteners, fittings, shafts), etc.

astm b983 incoloy 925 seamless pipe heavy wall - Nickel-based super alloy: Incoloy 925 (Alloy 925/UNS N08925)

ASTM B983 UNS N08925 heavy-wall seamless pipe, 16″ w.t=45mm, Incoloy 925.

Characteristics of Incoloy 925 (N08925) nickel-based alloy:

  • Good mechanical strength and extensive corrosion resistance.

Chemical Composition Requirement

The Chemical Composition of Incoloy 925, %
Nickel 42.0-46.0
Chromium 19.5-22.5
Iron ≥22.0
Molybdenum 2.5-3.5
Copper 1.5-3.0
Titanium 1.9-2.4
Alumium 0.1-0.5
Manganese ≤1.00
Silicon ≤0.50
Niobium ≤0.50
Carbon ≤0.03
Sulfur ≤0.30

Mechanical Properties of Incoloy 925

Tensile Strength, min. Yield Strength, min. Elongation, min. Hardness, min.
Mpa ksi Mpa ksi % HRC
1210 176 815 118 24 36.5

Physical Properties of Incoloy 925

Density Melting Range Specific Heat Electrical Resistivity
g/cm3 °F °C J/kg.k Btu/lb. °F µΩ·m
8.08 2392-2490 1311-1366 435 0.104 1166

Product Forms and Standards

Product Form Standard
Rod, bar & Wire ASTM B805
Plate, sheet & strip ASTM B872
Seamless pipe and tube ASTM B983
Forging ASTM B637

Application areas of nickel-based alloy incoloy 925 (Alloy 925/UNS N08925):

  • Heating pipes, containers, baskets and chains used in sulfuric acid pickling plants.
  • Sea water cooling heat exchanger, marine product pipeline system, acid gas environment pipeline.
  • Heat exchanger, evaporator, washing, dip tube, etc. in phosphoric acid production.
  • Air heat exchanger in petroleum refining.
  • Food engineering, chemical process.
  • Flame retardant alloy for high pressure oxygen application.
  • Heat exchange tubes
  • Pipe fittings
  • Flanges
  • Valves

Variety specifications and supply status of Nickel-based super alloy: Incoloy 925 (Alloy 925/UNS N08925):

Variety classification:

Yaang Pipe Industry can produce various specifications of Incoloy925 seamless pipe, Incoloy925 steel plate, Incoloy925 round bar, Incoloy925 forgings, Incoloy925 flangeIncoloy925 pipe fittings, Incoloy925 welded pipe , Incoloy925 steel strip, Incoloy925 wire and supporting welding materials. 

Delivery status:

  • Seamless pipe: solid solution + acid white, length can be set;
  • Plate: solid solution, pickling, trimming;
  • Welded pipe: solid solution acid white + RT% flaw detection;
  • Forging: annealing + car polish; Bars are forged and rolled, surface polished or car polished;
  • Strips are delivered after cold rolling, solid solution soft state, and deoxidized;
  • Wire rods are finely ground in solid solution pickled disk or straight strips, solid solution straight strips Delivery in light state.

Source: China Incoloy 925 Flanges Manufcturer – Yaang Pipe Industry (

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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