Lork Group high-quality Incoloy 903 (UNS N19903) is an agehardenable nickel-iron-cobalt alloy whose outstanding characteristics are a constant low coefficient of thermal expansion, a constant modulus of elasticity, and high strength.

Lork Group high-quality Incoloy 903 (UNS N19903) is an agehardenable nickel-iron-cobalt alloy whose outstanding characteristics are a constant low coefficient of thermal expansion, a constant modulus of elasticity, and high strength.

UNS N19903 that stands out for its exceptional resistance to a wide range of corrosive environments, particularly those containing chloride ions. It is known for its excellent resistance to pitting and crevice corrosion, making it suitable for demanding applications in harsh conditions like seawater, acidic or alkaline solutions, and high-temperature water.

Incoloy 903 has high mechanical properties at room temperature and retains much of its strength up to around 1200°F (650°C). As indicated by the impact strength, no deleterious phases were present in the alloy. All properties are reported for age-hardened material.

Stress-rupture properties of the alloy are governed by thermomechanical processing. Typical stress to produce rupture in 100 h of agehardened material at 1200°F (650°C) is 85 ksi (586 MPa). Room-temperature plane strain fracture toughness (KIC) of agehardened alloy 903 is 100.6 ksi • in (111.36 MPa • m) (average of three tests).

• Rocket-Engine Thrust Chambers
• Gage Blocks
• Steam-Turbines Bolts
• Ordnance Hardware
• Rings and Castings
• Fasteners

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