347 stainless steel is variant of the basic austenitic 18/8 Grade 304 with added Columbium – the introduction of Columbium stabilizes the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion.
The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures.
Benefits of 347 Stainless Steel
Higher creep stress and rupture properties when compared with 304
Ideal for high temperature service
Overcomes sensitization and intergranular corrosion concerns
Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications
Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L
Excellent mechanical properties
A high carbon version (347H) is also available
Typical Uses
Heat exchangers
High temperature steam service
High temperature chemical process
Both 347/347H are used primarily in elevated temperature applications.
Chemical Composition
UNS No
Grade
C
Si
Mn
P
S
Cr
Mo
Ni
N
Other
S34700
347
0.08
0.75
2.00
0.045
0.030
17.00/19.00
–
9.00/13.00
–
Cb:10xC1.00
Mechanical Properties
UNS No
Grade
Proof Stress 0.2% (MPa)
Tensile Strength (MPa)
Elongation A5(%)
Hardness Max
HB
HRB
S34700
347
205
515
40
201
92
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