Incoloy 903 Rod: Exceptional Performance in High-Temperature Applications

Incoloy 903, also known as UNS N19903, is a precipitation-hardenable nickel-iron-cobalt alloy renowned for its outstanding combination of mechanical strength, thermal stability, and resistance to thermal expansion. These properties make it an ideal material for components subjected to high temperatures and mechanical stress.

Chemical Composition

Incoloy 903's unique properties arise from its carefully balanced chemical composition:​

​The balance of the composition is predominantly iron, with minimal quantities of other elements.

Mechanical Properties

Incoloy 903 maintains high mechanical strength across a wide temperature range:​

• Tensile Strength (Precipitation Hardened): Approximately 1310 MPa (190,000 psi)​

• Yield Strength (0.2% Offset, Precipitation Hardened): Around 1100 MPa (160,000 psi)

• Elongation at Break (Precipitation Hardened): 14%​

• Modulus of Elasticity (at 0°C/32°F): 146.8 GPa (21,290 ksi)​

Physical Properties

Key physical characteristics of Incoloy 903 include:​

• Density: 8.25 g/cm³ (0.298 lb/in³)​

• Melting Range: 1318°C - 1393°C (2405°F - 2539°F)​

• Curie Temperature: 416°C - 471°C (780°F - 880°F)​

Applications

The unique properties of Incoloy 903 make it suitable for various demanding applications, including:​

• Rocket-engine thrust chambers

• Steam-turbine bolts​

• Springs​

• Gage blocks​

• Ordnance hardware​

Frequently Asked Questions (FAQs)

Q1: What industries benefit from Incoloy 903 rods?

Incoloy 903 rods are extensively used in aerospace and power generation industries, particularly for components requiring high strength and stability at elevated temperatures.​

Q2: How does Incoloy 903 compare to other superalloys?

Compared to other superalloys, Incoloy 903 offers a unique combination of low thermal expansion and high strength, making it particularly suitable for applications where dimensional stability is critical under thermal cycling conditions.​

Q3: What are the heat treatment recommendations for Incoloy 903?

The recommended heat treatment for Incoloy 903 involves solution annealing followed by air cooling or rapid quenching, depending on the desired microstructure and mechanical properties.​

For more detailed information on Incoloy 903, including machining and welding considerations, please refer to the datasheet provided by Special Metals.

Wuxi Nickel New Material Co., Ltd. is a high-tech enterprise integrating the production, manufacturing, and research & development of specialty alloy materials. Located in Wuxi, Jiangsu Province, the company specializes in precision alloys, titanium alloys, high-temperature alloys, corrosion-resistant alloys, heat-resistant steels, nickel-based welding wires, and other specialty materials, with an annual production capacity of 5,000 tonnes. Our product range includes plates, bars, wires, and strips, which are widely used in industrial electric furnaces, power‐station boilers, petrochemical plants, aerospace, marine engineering, machinery, and electronic instrumentation. These materials are characterized by high electrical resistance, high‐temperature strength, corrosion resistance, wear resistance, and fatigue resistance. We can manufacture in compliance with national, industry, and international standards, and are also able to tailor products to meet specific customer requirements.
The company is committed to improving and enhancing its production infrastructure all year round, with a full range of production and processing equipment including vacuum smelting, hot processing, cold processing, and heat treatment. It also has various physical and chemical analysis testing facilities such as spectrometers to ensure product quality. The company has a high-quality R&D, production, and management team that is fully capable of meeting the complex requirements of the current market for material diversification, refinement, and functionalization. Our company is particularly skilled in developing and producing "specialized materials" that are suitable for the market and specific customer needs, which will be one of our company's characteristics. The company adheres to the business philosophy of "guided by market demand, driven by technological progress, and committed to optimizing and innovating materials to create greater value for customers", serving society and the market.