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SS 347 / 347H

Stainless Steel 347 UNS S34700 is advantageous for high temperature service because of its good mechanical properties . SS 347 also has excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800° to 1500° F. SS 347 is similar to SS 321 with respect to intergranular corrosion which is achieved through the use of columbium as a stabilizing element to maximize this feature. SS 347 can not be hardened through heat treating, but elevated properties may be obtained through cold reduction. SS 347H is a modification of SS 347 with a higher carbon content, to provide improved high temperature strength.

Chemical Composition

SS 347 SS 347H
Ni 9 – 13 9 – 13
Cr 17 – 19 17 – 19
C 0.08 max 0.04 – 0.10
Mo 3 – 4 3 – 4
Fe Balance
Mn 2 max 2 max
Si 0.75 max 0.75 max
S 0.03 max 0.03 max
P 0.045 max 0.045 max
Co + Ta 10xC min
1.00 max
8xC min
1.00 max

Specifications

Stainless Steel SS 347 / 347H
AISI 347 / 347H
UNS S34700 / S34709
Werkstoff Nr. 1.4550 / 1.4961

Mechanical & Physical Properties

Density 8.0 g/cm3
Melting Point 1454 °C (2650 °F)
Tensile Strength Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset) Psi – 30000 , MPa – 205
Elongation 35 %