DS Plate 2205 TISCO S32205 Plate Laser Cutting Duplex Steel
Properties
DS Plate 2205 TISCO S32205 Plate Laser Cutting
Duplex stainless steel are extremely corrosion resistant, work hardenable alloys. Their
microstructures consist of a mixture of austenite and ferrite
phases. As a result, duplex stainless steels display properties
characteristic of both austenitic and ferritic stainless steels.
This combination of properties can mean some compromise when
compared with pure austenitic and pure ferritic grades. Duplex stainless steel are in most cases, tougher than ferritic stainless steel. Strengths of duplex stainless steels can in some cases be double
that for austenitic stainless steels.
Whilst duplex stainless steel are considered resistant to stress corrosion cracking, they are
not as resistant to this form of attack as ferritic stainless steel. However, the corrosion resistance of the least resistant Duplex stainless steel is greater than that for the most commonly used grades of stainless steel, i.e. 304 and 316.
Duplex stainless steel are also magnetic, a property that can be used to easily
differentiate them from common austenitic grades of stainless.
ASTM A240/A240M
Property data given in this document is typical for bar products
covered by EN 10088-3:2005. ASTM, EN or other standards may cover
products sold. It is reasonable to expect specifications in these
standards to be similar but not necessarily identical to those
given in this datasheet.
Alloy Designations
Due to excellent corrosion resistance and high strength, the most
widely used duplex stainless steel is 2205. The name 2205 comes from a typical composition of 22%
Chromium and 5% Nickel. Other designations for 2205 are given in
the table below.
Table 1. Some standard designations for duplex stainless steel alloys
| Euronorm | UNS | BS | En | Grade |
| 1.4462 | S31803
S32205 | 318S13 | - | 2205 |
| 1.4507 | S32520
S32550 | - | - | UR52N+ |
Chemical Composition of Duplex stainless steel
Table 2. Typical chemical composition for two duplex stainless steel alloys
| % | 2205 | UR52N+ |
| C | 0-0.03 | 0.03 max |
| Mn | 2.0 | 1.5 |
| Si | 1.0 | 0.8 |
| P | 0-0.03 | 0.035 |
| S | 0-0.02 | 0.02 |
| Cr | 21-23 | 24-26 |
| Mo | 2.5-3.5 | 3.0-5.0 |
| Ni | 4.5-6.5 | 5.5-8.0 |
| N | 0.08-0.2 | 0.2-0.35 |
| Cu | - | 0.5-3.0 |
Properties of Duplex stainless steel
Mechanical Properties of Duplex stainless steel
Table 3. Typical mechanical properties of two duplex stainless steel alloys
| Grade | 2205 | UR52N+ |
| Tensile Strength (MPa) | 620 | 770 |
| Proof Stress 0.2% (MPa) | 450 | 550 |
| Elongation A5 (%) | 25 | 25 |
Physical Properties of Duplex stainless steel
Table 4. Typical physical properties of two duplex stainless steel alloys
| Property | 2205 | UR52N+ |
| Density (g.cm3) | 7.805 | 7.810 |
| Modulus of Elasticity (GPa) | 200 | 205 |
| Electrical Resistivity (Ω.m) | 0.085x10-6 | 0.085x10-6 |
| Thermal Conductivity (W/m.K) | 19 at 100°C | 17 at 100°C |
| Thermal Expansion (m/m.K) | 13.7x10-6 to 100°C | 13.5x10-6 to 200°C |
Corrosion Resistance of Duplex stainless steel
Duplex stainless steel are extremely corrosion resistant. They have high resistance to
intergranular corrosion. Even in chloride and sulphide
environments, Duplex stainless steelexhibit very high resistance to stress corrosion cracking.
The super duplex grades are even more resistant to corrosion.
Heat Resistance of Duplex stainless steel
The high chromium content of Duplex stainless steel that p rotects against corrosion, causes embrittlement at
temperatures over about 300°C.
At low temperatures duplex stainless steels have better ductility
than the ferritic and martensitic grades. Duplex grades can readily
be used down to at least -50°C.
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