Incoloy 903

Incoloy 903 is a nickel-cobalt alloy rod and rolled tube engineered for demanding applications. It offers a tensile strength of 900 MPa combined with ultra-low thermal expansion at 650 ℃, thanks to its 38-41% nickel matrix and 14-17% cobalt content. This precise composition ensures exceptional dimensional stability and mechanical performance, making it highly suitable for critical components such as aviation seals and nuclear power equipment.

Equivalent grades

• Incoloy 903
• UNS N19903
• GH2903
• Nimonic 903

Chemical Composition Reference

Ni: 38%~41%

Co: 14%~17%

Cr: 0.5%

Nb: 2.8%~3.3%

Ti: 1.3%~1.7%

Al: 0.7%~1.2%

Si: 0.5%

Mn: 0.5%

C: 0.05%

Physical Property Reference

• Density: 8.25 g/cm³

• Tensile Strength: 1310 MPa

• Yield Strength: 1100 MPa

• Elongation at break: 14%

• Melting Point: 1385°CStock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Thick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee…)
• Customize

Essential details

Incoloy 903 is a versatile alloy widely used in flue gas desulfurization systems and pharmaceutical reaction vessels. Its composition includes approximately 43-47% nickel, 38-46% chromium, at least 5% iron, 1.5% copper, 2.5% molybdenum, and trace elements such as cobalt and tungsten. This alloy combines hardness and ductility with high thermal and electrical conductivity, making it ideal for electronics and wiring applications. Additionally, Incoloy 903 offers natural corrosion resistance, ease of processing, and non-magnetic properties, supporting reliable performance in demanding industrial environments.

Applications:

- Rocket-engine thrust chambers

- Steam-turbine bolts

- Springs

- Gage blocks

- Ordnance hardware