347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel.
This material is stabilized against chromium carbide formation by the addition of columbium and tantalum.
Since these elements have a stronger affinity for carbon than chromium,
columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries.

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347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel. This material is stabilized against chromium carbide formation by the addition of columbium and tantalum. Since these elements have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries. 347 should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC) or for welding under conditions which prevent a post-weld anneal. 347 is non-magnetic.

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The Physical Properties of SS347
Density(lb/cu. in.)	0.29
Specific Gravity	8.03
Specific Heat(Btu/lb/Deg F)	0.12
Electrical Resistivity(microhm-cm)	438
Melting Point(Deg F)	2600

The Chemical Composition of SS347, %
Carbon	≤0.08
Manganese	≤2.00
Phosphorus	≤0.045
Sulfur	≤0.030
Silicon	≤0.75
Chromium	17.0-19.0
Nickel	9.0-13.0

Mechanical Properties of SS347

Tensile Strength, min.		Yield Strength, min.		Elongation	Hardness
ksi	Mpa	ksi	Mpa	%	HBW	Rockwell
75	515	30	205	40	201	92HRBW

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