Stainless Steel - Grade 347 - AISI 347 Fe/Cr18/Ni10/Nb (UNS S34700)

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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