Duplex Stainless Steel Round Bar
Duplex stainless steel 2205/1803 Bar was created as an option in contrast to which it can conquer the specialized shortcoming of both austenite and ferrite treated steel which is accessible in the market. Both have low quality, ferritic steels have poor low temperature durability, and austenitic steels have especially low resistance from stress corrosion cracking.
Chemical composition
|
GRADE |
NI |
CR |
MO |
C |
MN |
SI |
P |
S |
N |
|
|---|---|---|---|---|---|---|---|---|---|---|
|
S31803 |
MIN |
4.5 |
21 |
2.5 |
– |
– |
– |
– |
– |
0.08 |
|
MAX |
6.5 |
23 |
3.5 |
0.03 |
2 |
1 |
0.03 |
0.02 |
0.2 |
|
|
S32205 |
MIN |
4.5 |
22 |
3 |
– |
– |
– |
– |
– |
0.14 |
|
MAX |
6.5 |
23 |
3.5 |
0.03 |
2 |
1 |
0.03 |
0.02 |
0.2 |
Duplex stainless steel 32205 or 31803 has a microstructure which comprise of appropriate mixing of both austenite and ferrite blend in same proportion which serves it superior to different stainless steel, for example, SS304 or SS316 or SS316L accessible in market.
Properties
Duplex Round Bar has great weldability because of which all standard welding procedures can be utilized. Duplex sheet and plates are not as very as effectively welded as the austenitic grade, yet low thermal expansion in duplex grade decreases bending and residual stresses after welding.
Mechanical Properties
|
Grade |
Tensile Strength |
Yield Strength |
Elongation |
Hardness, MAX |
|---|---|---|---|---|
|
[MPA] |
[MPA] |
(% in 50mm) min |
HRB |
|
|
S32205/S31803 |
620 |
448 |
25 |
290 |
Duplex stainless steel UNS32205 or UNS31803, it contains a higher proportion of chromium, molybdenum, and nitrogen content and which makes it better chloride stress corrosion cracking resistance to pitting and crevice corrosion. The addition of nickel makes it more superior and advantageous in more corrosive environments.
Physical properties
|
DUPLEX 2205 / 31803 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat (J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
0-100°C |
||||
|
2205 |
782 |
190 |
13.7 |
14.2 |
– |
20 |
– |
418 |
850 |
Specification
The Specification for Wrought Duplex Round Bar as per astm Standard is ASTM A276/ASME SA-276, they are categorised into different form and shape such as SS Duplex 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.
Round bars 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
- Pressure vessel, tanks, piping and heat exchanger in the chemical processing industry
- Piping, tubing, and heat exchangers for the handling of gas and oil
- Effluent scrubbing system
- Pulp and paper industry digesters, bleaching equipment, and stock-handling system
- Rotors, fan, shafts, and press rolls requiring combined strength and corrosion resistance
- Cargo tanks for ship and trucks
- Food processing equipment
- Biofuels plants
