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347H

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) 

PropertiesUnit of Measure347H
Tensile Strengthksi75 min
0.2% Yield Strengthksi30 min
Elongation%40 min
HardnessHV92 max

*Nominal Room Temperature Mechanical Properties.  Typical Data.  Not suitable for design or specifications.

Composition

Element 347H
CrChromium17.0-19.0
NiNickel9.0-13.0
MnManganese2.000 max
SiSilicon0.750 max
PPhosphorus0.045 max
CCarbon0.04-0.08
SSulfur0.030 max
Nb + TaNiobium + Tantalummin 10XC, max 1.0
FeIronBalance