Jan 6 2004
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
The key properties of Stainless Steel-Grade 347 are tabulated below.
Table 1. 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 |
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