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	PRODUCT DATA of Incoloy 903

Material

Incoloy 903

Product Datasheet

Incoloy alloy 903

General Information

INCOLOY 903 is an age-hardenable nickel-iron-cobalt alloy whose characteristics are a constant low coefficient of thermal expansion, a constant modulus of elasticity, and high strength The alloy has high mechanical properties at room temperature and retains much of its strength up to around 650°C.

Processing and Assembly

Material heat treated 845°C/1 h, W.Q. + 720°C/8 h, F.C. at 56°C/h to 620°C/8 h, A.C.

Precautions

Data from manufacturer Datasheet.

Chemical Composition

Fe-38Ni-15Cr-1Al-1.5Ti-3Nb

Name of Manufacturer

Special Metals Wiggin Ltd Hereford, England +44 (0)1432 382200 +44 (0)1432 264030 info@specialmetalswiggin.co.uk

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

	PHYSICAL PROPERTIES

Specific Gravity

8.25

Curie Temperature

416 to 471 °C

	ELASTIC PROPERTIES

Tensile Modulus

147 GPa

Poisson Ratio

0.239

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

6.5e-7 ohm.m

	THERMAL PROPERTIES

Thermal Conductivity

16.9 W/m.K

Thermal Expansion Coefficient

7.2 μstrain/°C

Specific Heat

0.442 J/g.K

Melting Range

1320 to 1390 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

No specific corrosion protection required

Stress Corrosion Status

High Resistance to SCC: Table 1 Data Quality: Design Data

Bimetallic Corrosion

Can be connected without any restriction to: 400 series Stainless steel Can be connected in a non-controlled environment to the above and 300 series stainless steel, Ti and Ti-alloys, Cr, Cu, brasses, Cu-Ni, Al-bronzes, Si-bronzes, Can be connected in a clean room environment to above and Ag, SnPb alloys, Sn, Pb, low C steel, Al-Cu alloys, Cd, Au Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data

Welding

INCOLOY alloy 903 is readily joined by the TIG welding process.