Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886)

What is Incoloy 330?

Incoloy 330 (UNS N08330) is a nickel-iron-chromium austenitic alloy, specially used in high temperature environment Oxidation and carburization. The nickel content of 34%-37% makes the material highly resistant to chloride stress corrosion cracking and sigma phase precipitation embrittlement. The material is processed through standard processing procedures for stainless steel and nickel alloys. It is widely used for anti-corrosion in the environment of combined heating and carburizing.

Designated as UNS N08330 or DIN W.Nr. 1.4886, Incoloy 330 (also known as “Alloy 330”) is an iron-nickel-chromium alloy with deliberately controlled addition of silicon to improve its oxidation resistance. It has a solid solution composition and is not hardenable by heat treatment. The high nickel and chromium contents provide excellent resistance to oxidation and carburization. Alloy 330 has very good high-temperature strength and corrosion resistance, as well as excellent workability and weldability. It is mainly used for industrial heating furnaces, muffles, flare tips, alloy gridss, bar baskets, gas turbine components, boiler fixtures, and other high-temperature components.

8inch alloy 330 seamless pipe - Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886)

ASTM B535 UNS N08330 seamless pipes after preliminary rolling, 219.1mm(O.D)x13.6mm(W.T), Incoloy Alloy 330.

Chemical Composition Requirements of Incoloy 330 (UNS N08330/W.Nr. 1.4886)

The Chemical Composition of Incoloy 330, %
Nickel 34.0-37.0
Chromium 17.0-20.0
Iron Balance
Carbon ≤0.08
Silicon 0.75-1.50
Manganese ≤2.00
Phosphorus ≤0.030
Sulfur ≤0.030

Physical Properties of Incoloy 330 (UNS N08330/W.Nr. 1.4886)

Density Melting Range Specific Heat Permeability
g/cm3 lb/in3 °F °C J/kg.°C @ 200 oersteds
8.08 0.292 2520-2590 1380-1420 460 1.02

Mechnaical Properties of Incoloy 330 (UNS N08330/W.Nr. 1.4886)

Tensile Strength Yield Strength Elongation
Mpa ksi Mpa ksi %
552-621 80-90 221-290 32-42 35-45

Mechanical properties in annealed state at room temperature:

Ultimate tensile strength, ksi (MPa) 80-85 (552-586)
0.2% conditional yield strength, ksi (MPa) 30-43 (207-296)
Two inches elongation% 40-45
Hardness, Rockwell B grade 70-85

High temperature mechanical properties, tensile properties of annealed materials

20200802003555 90201 - Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886)

Incoloy 330 (N08830) nickel-based alloy specific heat:

  • (1): 0.11 BTU/lb/°F (32-212 °F) (British heat/lb/Fahrenheit). 
  • (2): 460 Joules/kg/°C (0-100°C) (Joules/kg/°C). 

Incoloy 330 (N08830) nickel-based alloy permeability:

  • 1.02 at 70°F/20°C (RT). 

Product Forms and Standards

Product Form Standard
Bars and shapes ASTM B511
Billets and bars ASTM B512
Seamless pipes and tubes ASTM B535, B829
Weld pipes and tubes ASTM B546, B710, B739
Plates, sheets and strips ASTM B536
Welded fittings ASTM B366
Forging SAE AMS 5716

Application areas of nickel-based alloy incoloy 330 (UNS N08330/W.Nr. 1.4886):

  • 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

Incoloy 330 (N08830) nickel-based alloy linear average coefficient of thermal expansion: 

1 1F11Q23639591 - Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886)

Incoloy 330 (N08830) nickel-based alloy electric heating characteristics:

temperature Thermal conductivity Resistivity
°F °C Btu-in/ft2-h-°F★ Watt/meter/degree Celsius Micro ohm cm Microohm.m
75 twenty four 86 12.4 612 1.017
400 204 108 15.6 649 1.079
800 427 134 19.3 688 1.144
1200 649 162 23.4 721 1.199
1600 871 198 28.6 744 1.237
1800 982 216 31.2 749 1.245

Remarks: Btu-in/ft2-h-°F refers to the heat directly conducted per hour per square foot or per inch of material under each degree of temperature difference in Fahrenheit. Heat is the British thermal unit Btu (1btu is the energy required to heat 1 pound of water to 1 degree Fahrenheit). 

Corrosion resistance of Incoloy 330 (N08830) nickel-based alloy:

Incoloy 330 (N08830) has excellent corrosion resistance, especially for oxidation, carburization and nitriding environments Has corrosion resistance. In an aqueous environment, the chromium component of 330 can resist corrosion in an oxidizing environment, and the nickel component can enhance the resistance to reduction corrosion. The high nickel content of the alloy makes the material quite resistant to chloride stress corrosion cracking and sigma phase embrittlement. 

Oxidation resistance of Incoloy 330 (N08830) nickel-based alloy:

Incoloy 330 (N08830) has excellent oxidation resistance, and has good anti-scaling ability under the conditions of 2000°F (1095°C). Any oxide scale will adhere tightly to the surface of the material after it is formed, especially under conditions of alternating cold and heat cycles. 

Carburization resistance of incoloy 330 (N08830) nickel-based alloy:

35% nickel and a certain amount of silicon make the material have excellent carburization resistance. Under the alternate environment of carburization and oxidation, Alloy 330 exhibits excellent resistance to “green rot”. 

Heat treatment of Incoloy 330 (N08830) nickel-based alloy

Incoloy 330 (N08830) is an austenitic stainless steel, which cannot be hardened by heat treatment. Only by cold working can it be hardened and reach room temperature strength. For most high-temperature applications, 330 is not annealed after cold forming or welding. If the material needs to be fully annealed, it should be done in the temperature range of 1870-2050°F (1020-1120°C). The best creep resistance can be obtained by water quenching the material, but rapid cooling to below 800°F (425°C) can also achieve the same effect. 

Manufacturing of Incoloy 330 (N08830) nickel-based alloy

Incoloy 330 (N08830) alloy can be hot or cold formed using standard procedures for austenitic stainless steel and nickel alloys. The work hardening rate of the alloy can be compared with other austenitic stainless steels. It is recommended to process the material in a room temperature environment. If the material needs thermal processing, the material should be evenly heated to 2050-2150°F (1120-1180°C), and then reduced to 1750¼°F (950°C) for heat preservation. The material should be cooled quickly with water quenching. 
We recommend annealing treatment after hot working to ensure the best corrosion resistance and the best grain structure of the material. The material cannot be forged or bent in the range of 1200-1600°F (650-870°C) because the ductility of the material is low in this temperature range, which will cause the intergranular structure of austenitic alloy materials to crack. 

Welding of Incoloy 330 (N08830) nickel-based alloy

Incoloy 330 (N08830) can be welded by tungsten arc, electrode welding and plasma arc processing, and the corrosion resistance obtained by tungsten arc welding is the best. Before welding, the material should be annealed and kept clean and free of dirt, grease and other impurities. Grinding should be done within one inch of both sides of the joint. The temperature between welding layers cannot exceed 300°F (150°C), and no heat treatment is required before or after welding. Alloy 330 can be welded into different types of metals.

Variety specifications and supply status of Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886):

Variety classification:

Yaang Pipe Industry can produce various specifications of Incoloy330 seamless pipe, Incoloy330 steel plate, Incoloy330 round bar, Incoloy330 forgings, Incoloy330 flangeIncoloy330 pipe fittings, Incoloy330 welded pipe , Incoloy330 steel strip, Incoloy330 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 330 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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