347H

347H has increased resistance to intergranular corrosion and is useful in strongly oxidizing environments due to the addition of niobium (formerly columbium). Products are supplied to meet ASTM, ASME, NACE, UNS and EN standards where appropriate. UNS S34709.

Mechanical Properties* (In Annealed Condition)

Properties	Unit of Measure	347H
Tensile Strength	ksi	75 min
0.2% Yield Strength	ksi	30 min
Elongation	%	40 min
Hardness	HV	92 max

*Nominal room temperature mechanical properties. Typical data. Not suitable for design or specifications

Composition

Element		347H
Cr	Chromium	17.0-19.0
Ni	Nickel	9.0-13.0
Mn	Manganese	2.000 max
Si	Silicon	0.750 max
P	Phosphorus	0.045 max
C	Carbon	0.04-0.08
S	Sulfur	0.030 max
Nb + Ta	Niobium + Tantalum	Min 10XC, max 1.0
Fe	Iron	Balance