Austenitic SS 347 Round Bar
SS 347 Round Bar is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel similar to type 304 with an addition of Columbium and Tantalum. SS 347 Bar has slightly improved corrosion resistance over type 321 stainless steel in strongly oxidizing environments.
Chemical Properties
|
GRADE |
Cr |
Ni |
C |
Mn |
P |
Si |
Fe |
S |
Cb) |
|
|---|---|---|---|---|---|---|---|---|---|---|
|
SS 347H |
MIN |
17 |
9 |
0.04 |
– |
– |
– |
– |
10 x (C) |
|
|
MAX |
19 |
13 |
0.1 |
2 |
0.045 |
1 |
BALANCE |
0.03 |
1 |
|
|
SS 347 |
MIN |
17 |
9 |
– |
– |
– |
– |
– |
8 x (C) |
|
|
MAX |
19 |
13 |
0.08 |
2 |
0.045 |
1 |
BALANCE |
0.03 |
1 |
Properties
SS 347 Bar is an austenitic stainless steel offering an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500O F. SS 347 has columbium to stabilize it which is preferred in aqueous and low-temperature environments as it has good resistance capabilities to intergranular attacks.
Mechanical Properties
|
Grade |
Tensile Strength |
Yield Strength |
Elongation |
Reduction of area |
|---|---|---|---|---|
|
[MPA] |
[MPA] |
(% in 50mm) min |
min % |
|
|
SS 347 |
515 |
205 |
40 |
50 |
|
SS 347H |
515 |
205 |
40 |
50 |
Stainless Steel 347 Round Bar is a niobium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L. This grade is typically used in the 800-1500 ̊F temperature range where it is stabilized against chromium carbide precipitation by the addition of niobium, which results in the precipitation of niobium carbides.
PHYSICAL PROPERTIES
|
Grade |
Density (Kg/m3) |
Melting range |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) at 0-100°C |
Thermal Conductivity (W/m.K) at 100°C |
Specific Heat (J/Kg.K) at 20°C |
Electric Resistivity at 20°C Ω mm2 /m |
|---|---|---|---|---|---|---|---|
|
SS 347/347H |
7.96 |
1398-1446 °C |
190-210 |
17.3 |
16.3 |
500 |
0.73 |
Specification
The Specification for Wrought Stainless Steel 347 Round Bar as per astm Standard is ASTM A276/ASME SA-276, they are categorised into different form and shape such as SS 347/347H Round Bar, Rod, Channel Bar, T-Bar, Flat Bar, Blocks, Square, bar, Triangle, Threaded, Hex (A/F), Profiles, Half Ingot, Billet, I/H Bar, etc.
When considering wrought stainless round bars, material shall be furnished in the following way such as Hot-worked, Hot-worked and Annealed, Hot-worked- Annealed and cold worked or Hot-worked-Annealed and heat treated.
SS 347 Round Bar depending upon their treatment and their use and application they can also be available in different surface finishes such as Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish, 2B, 2D. etc
Applications
Alloy 347 or SS 347 Bar applications include High temperature chemical processes, Heat exchanger tube, High temperature steam service, High pressure steam pipes, Radiant superheaters, Boiler tubes, Heavy duty exhaust systems, General refinery piping.
