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PRODUCT DATA of Incoloy 903
MaterialIncoloy 903
Product DatasheetIncoloy alloy 903
General InformationINCOLOY 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 AssemblyMaterial 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.
PrecautionsData from manufacturer Datasheet.
Chemical CompositionFe-38Ni-15Cr-1Al-1.5Ti-3Nb
Name of ManufacturerSpecial Metals Wiggin Ltd
Hereford, England
+44 (0)1432 382200
+44 (0)1432 264030
info@specialmetalswiggin.co.uk
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
PHYSICAL PROPERTIES
Specific Gravity8.25
Curie Temperature416 to 471 °C
ELASTIC PROPERTIES
Tensile Modulus147 GPa
Poisson Ratio0.239
ELECTRICAL PROPERTIES
Electrical Volume Resistivity6.5e-7 ohm.m
THERMAL PROPERTIES
Thermal Conductivity16.9 W/m.K
Thermal Expansion Coefficient7.2 μstrain/°C
Melting Range1320 to 1390 °C
Specific Heat0.442 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusNo specific corrosion protection required
Stress Corrosion StatusHigh Resistance to SCC: Table 1
Data Quality: Design Data
Bimetallic CorrosionCan 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
WeldingINCOLOY alloy 903 is readily joined by the TIG welding process.