INCOLOY alloys are quite a common type of super alloys that have nickel as their base metal. INCOLOYS are known to be composed by having nickel-chromium-iron as the principal components. To augment the strength, durability and corrosion resistance capacity of these alloys, nitrogen, molybdenum and copper are quite commonly added to it. Such nickel alloys have the capacity to function at elevated temperatures without causing any kind of inconvenience.

INCOLOY alloy 330 is an alloy that majorly features nickel-iron-chromium, and has a bit of silicon added to it. The addition of silicon provides this alloy with heightened oxidation resistance. INCOLOY 330 is known to display a commendable strength at high temperature, and has quite good resistance to reduction environments and oxidation. Even after being exposed to a high temperature environment for long durations, the microstructure of this alloy manages to maintain its stability.

The nickel content of INCOLOY alloy 330 tends to be somewhere around 34%-37%, which helps in providing a good resistance to both carburization and oxidation from the precipitation of sigma phase. This nickel alloy does not get affected under the typical conditions of cooling and heating, or even in alternate oxidizing and carburizing atmospheres.

Heat Treatment

INCOLOY 330 cannot be hardened by any thermal treatment, and is essentially a type of austenitic alloy. Only cold working tends to contribute to increased room temperature strength. INCOLOY 330 is typically not annealed subsequent to welding or cold forming, for the majority of high-temperature applications.

In case full anneal is needed, then it must be carried out a temperature range of 1020-1120°C/ 1870-2050°F. While rapid air cooling below the temperature of 800°F can be used, water quenching is known to provide optimal creep resistance when it comes to INCOLOY 330.


INCOLOY 330 is known to be easily cold or hot formed with the usage of certain standard procedures for nickel alloys and for austenitic stainless steels. The rate of work hardening in the case of this alloy is similar to that of stainless steel.

For the fabrication of INCOLOY 330, forming at room temperature is typically recommended. In case hot working is necessary, then the alloy must be heated to a starting temperature of1120-1180°C/ 2050-2150°F in a uniform manner, and finished above 950°C/1750°F. The cooling should additionally be done as promptly as possible or with the help of water quenching. Annealing is typically suggested subsequent to hot working to ensure optimum grain structure and maximum corrosion resistance.


INCOLOY 330 can ideally be welded through the plasma arc, SMAW and GTAW processes. To ensure optimal optimum corrosion resistance, using the GTAW process would be the most prudent option. The INCOLOY 330 must be in the annealed condition before welding, and should be cleaned of all grease, scale, and other contaminants as well.

Inconel 600 Seamless pipe Mechanical Properties:

Alloy and statetensile strength

Rm N/mm2

Yield Strength




Brinell hardness


annealing treatment55024030=195
solid solution treatment50018035=185

Chemical Composition

The chemical composition of INCOLOY alloy 330 is given in the following table.

ElementContent (%)
Iron, Fe43
Nickel, Ni34-37
Chromium, Cr17-20
Manganese, Mn≤2

Physical Properties

The following table discusses the physical properties of INCOLOY alloy 330.

Density8.08 gm/cm30.292 lb/in3

Mechanical Properties

The mechanical properties of INCOLOY alloy 330 are tabulated below.

Tensile strength(annealed)600 MPa87 ksi
Yield strength(annealed)280 MPa40.6 ksi
Elongation at Break45%45%

Alloy 330 Equivalent

Some of the designations used to denote INCOLOY alloy 330 are listed below:

UNS N08330SAE AMS 5592SAE AMS 5716SAE J405SAE J412

The major application areas of INCOLOY 330

  • Petrochemical and chemical processing: Heat exchangers, cracked ammonia components, flares, petrochemical furnace parts, and petrochemical waste remediation units
  • Ore Processing – Perlite systems and equipment
  • Power generation – Gas turbine components and boiler fixtures
  • Thermal processing – Salt pots, hear-treat furnace components, high temperature fans, and heat-treat furnace containers

INCOLOY 330 is quite commonly used for industrial heating furnaces, bar baskets, muffles and alloy grids as well.

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