Material Grade

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 347can 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.

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 %

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