Background

Stainless steels are iron based alloys containing at least 10.5% Chromium. They achieve their stainless characteristics through the formation of an invisible and adherent Chromium rich oxide film. Alloy 347 is a general purpose austenitic stainless steel with a face centreed cubic structure. It is essentially non-magnetic in the annealed condition and can only be hardened by cold working. Niobium has been added to suppress grain boundary Chromium Carbide precipitation.
Key Properties

Electrical Properties




Electrical resistivity ( µOhm.cm )


70-73

Mechanical Properties




Elongation at break ( % )


<60

Hardness - Brinell


160-190

Izod impact strength ( J.m-1 )


20-136

Modulus of elasticity ( GPa )


190-210

Tensile strength ( MPa )


520-1100

Physical Properties




Density ( g.cm-3 )


7.93

Melting point (°C )


1400-1425

Thermal Properties




Coefficient of thermal expansion ( x10-6 K-1 )


16-18 @ 20-100°C

Maximum use temperature in air ( °C )


800