1. What are the properties of INCOLOY 909 material?

INCOLOY 909 (UNS N09909) is a precipitation-hardenable nickel-iron-cobalt-based superalloy, engineered primarily for high-temperature structural applications requiring excellent creep resistance and thermal stability. Its key properties are as follows:

High-Temperature Creep Resistance: A standout property-maintains structural integrity and resists permanent deformation (creep) under long-term exposure to elevated temperatures (typically up to 650°C/1200°F) and mechanical stress. This makes it ideal for load-bearing components in high-heat environments.

Thermal Stability: Exhibits minimal thermal expansion and low sensitivity to thermal fatigue, reducing the risk of cracking or failure when subjected to repeated heating and cooling cycles.

Mechanical Strength: Achieves high tensile and yield strength through precipitation hardening (a heat treatment process that forms fine, strengthening precipitates within the alloy matrix). Its strength remains consistent even at moderate to high temperatures, outperforming many standard nickel-iron alloys.

Corrosion Resistance: Offers good resistance to oxidation in air and mild corrosive environments (e.g., industrial atmospheres) at high temperatures. While not designed for extreme corrosive conditions (e.g., concentrated acids), it provides adequate protection in typical high-temperature structural service.

Fabricability: Can be processed via standard manufacturing methods, including forging, rolling, and machining (with appropriate tooling for hardenable alloys). Welding is also feasible with proper pre- and post-weld heat treatments to maintain strength and avoid cracking.

2. What is the tensile strength of INCOLOY 909?

The tensile strength of INCOLOY 909 is highly dependent on its heat treatment condition, as precipitation hardening directly controls its mechanical properties. Below are typical values for the alloy in its fully hardened (solution-treated and aged) state (per industry standards such as ASTM or Special Metals Corporation specifications):

Ultimate Tensile Strength (UTS): Minimum 1100 MPa (160,000 psi); typical values range from 1100–1250 MPa (160,000–181,000 psi).

Yield Strength (0.2% offset): Minimum 895 MPa (130,000 psi); typical values range from 900–1050 MPa (130,000–152,000 psi).

Note: Tensile strength decreases slightly at elevated temperatures but remains sufficiently high for high-temperature service. For example, at 650°C (1200°F), the UTS typically drops to approximately 700–800 MPa (101,500–116,000 psi), which is still suitable for structural loads in such environments.

3. What is the hardness of INCOLOY 909?

Like tensile strength, the hardness of INCOLOY 909 is governed by its heat treatment. The alloy is almost exclusively used in the precipitation-hardened state, where hardness is maximized for structural performance. Typical hardness values are:

Rockwell Hardness (HRC): In the fully hardened (solution-treated and aged) condition, the hardness ranges from HRC 35–42.

Brinell Hardness (HB): Corresponding Brinell hardness values are approximately 340–400 HB (converted from HRC using standard hardness conversion charts).

In the annealed (softened) state (e.g., after hot working), hardness is significantly lower (around HRC 20–25, or 200–250 HB), but this condition is rarely used for end-service components-annealing is typically a intermediate step in manufacturing before final hardening.

4. What is INCOLOY 800 used for?

INCOLOY 800 (UNS N08800; including variants like 800H and 800HT) is a nickel-iron-chromium alloy valued for its balanced combination of high-temperature oxidation resistance, thermal stability, and moderate strength. Its primary applications span industries requiring reliable performance in temperatures up to 1000°C (1832°F). Key uses include:

Energy Industry:

Nuclear power: Components in light water reactors (LWRs), such as steam generator tubes, reactor vessel internals, and heat exchanger tubes-due to its resistance to high-temperature water/steam oxidation and low sensitivity to stress corrosion cracking.

Fossil fuel power: Superheater and reheater tubes in coal-fired or gas-fired power plants, where it withstands high-temperature flue gases and steam.

Petrochemical & Refining Industry:

Furnace tubes, reformer tubes, and catalyst support grids in steam methane reforming (SMR) processes (used to produce hydrogen or ammonia)-resists carburization and oxidation in high-temperature hydrocarbon environments.

Heat exchangers and piping in crude oil refining, where it handles moderately corrosive and high-temperature process streams.

Chemical Processing Industry:

Equipment for producing nitric acid, sulfuric acid, and other chemicals-offers good resistance to oxidation and mild chemical attack at elevated temperatures.

Reactors and pressure vessels used in high-temperature chemical synthesis.

Other Applications:

Aerospace: Components in aircraft engine nacelles or auxiliary power units (APUs) that operate at moderate high temperatures.

Industrial heating: Heating element sheaths and furnace liners, where oxidation resistance at high temperatures is critical.

Variants like INCOLOY 800H (higher carbon content for improved creep strength) and 800HT (additional alloying for enhanced high-temperature performance) are tailored for the most demanding high-temperature structural roles.

What is the property of INCOLOY 909 material

1. What are the properties of INCOLOY 909 material?

2. What is the tensile strength of INCOLOY 909?

3. What is the hardness of INCOLOY 909?

4. What is INCOLOY 800 used for?