Super Duplex Stainless Steel Flat
Super Duplex stainless 32750/32760, is a mixed microstructure of austenite and ferrite in the same proportion (50/50) which has improved strength over ferritic and austenitic steel grades. Super Duplex has a higher molybdenum and chromium content which gives the material greater corrosion resistance than standard duplex grades.
Chemical composition
|
GRADE |
ELEMENT |
CR |
C |
CU |
MN |
MO |
N |
NI |
P |
W |
Si |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
S32750/S32760 |
min |
24 |
– |
0.5 |
– |
3 |
0.24 |
6 |
– |
– |
– |
|
max |
26 |
0.03 |
1 |
2 |
5 |
0.35 |
8 |
0.35 |
0.03 |
1 |
Properties
Alloy 2507 is a super duplex stainless steel with chromium, molybdenum, and nickel addition that provides excellent resistance to chloride stress corrosion cracking, high thermal conductivity and a low coefficient of thermal expansion. The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.
Mechanical Properties
|
Grade |
Tensile Strength |
Yield Strength |
Elongation |
Hardness, MAX |
|
|---|---|---|---|---|---|
|
[MPA] |
[MPA] |
(% in 50mm) min |
HBW |
HRB |
|
|
S32750 |
795 |
550 |
15 |
310 |
32 |
|
S32760 |
750 |
550 |
25 |
270 |
– |
SS S32750/S32760 or super duplex flat and super duplex flat have low carbon content that reduces the risk of carbide precipitation at the grain boundaries during heat treatment; therefore, the alloy is highly resistant to carbide-related intergranular corrosion.
Physical properties
|
Grade |
Density (g/cm3) |
Melting Range °C |
Elastic Modulus (GPa) |
Thermal Expansion coefficient (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat (J/Kg.K) 20°C |
Electrical Resistivity (μΩ.cm) |
|---|---|---|---|---|---|---|---|
|
S32750/S32760 |
7.8 |
1350°C / 2460°F |
200 |
11.1 |
14.2 |
475 |
8.5 |
The high chromium and molybdenum content of super duplex stainless steel flat makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. It also provides excellent resistance to inorganic acids, especially those containing chlorides.
Application
The super duplex 32750/32760 due to its high pitting and crevice corrosion resistance and effective stress corrosion cracking is widely used in chemical industry, pharmaceutical industry, pulp and paper industry, seawater application and also in flue gas desulfurization process.
- Desalination plants, high pressure RO-plant and seawater piping
- Mechanical and structural components, high strength, corrosion-resistant parts·
- Power industry FGD systems, utility and industrial scrubber
- systems, absorber towers, ducting, and piping
- Pulp & Paper Mill Equipment
- Offshore Oil production/technology
- Oil and gas industry equipment
Shalco Industries is a manufacturing company of Flat in India and Global Supplier.
