Duplex stainless is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades with similar corrosion resistance qualities.
One of the main attractions of duplex stainless steel is cost – due to the materials increased yield strength it is often possible to reduce the thickness of material making it much cheaper than a comparative austenitic stainless steel grade.
Also Duplex steel has a lower alloy content reduces production costs. Certainly cost and weight savings without loss of performance is an attractive proposition to purchasers.
Corrosion resistance much better than that of Type 316
Greater tensile and yield strength
Good ductility and toughness though not as good as austenitic grades
Good stress corrosion cracking resistance (SSC)
Opportunity for purchases to reduce their material costs without compromising on quality
Mechanical Properties of S32205
| DESCRIPTION | DUPLEX 2205 |
| Proof Stress 0.2% (MPa) | 450 |
| Tensile strength (MPa) | 620 |
| Elongation A5 (%) | 20 |
| Hardness |
HB: 293 HRB: 96 (according to Rockwell C Scale) |
Chemical Composition of S32205
| UNS No | S32205 |
| EN | 1.4462 |
| AISI | 2205 |
| Carbon (C) | 0.030 |
| Silicon (Si) | 1.00 |
| Manganese (Mn) | 2.00 |
| Phosphorus (P) | 0.030 |
| Sulphur (S) | 0.020 |
| Chromium (Cr) | 22.0/23.0 |
| Molybdenum (Mo) | 3.0/3.5 |
| Nickel (Ni) | 4.5/6.5 |
| Nitrogen (N) |
0.14/0.20 |
SuperDuplex stainless like Duplex, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Superduplex has a higher Molybdenum and Chromium content which gives the material greater corrosion resistance.
SuperDuplex has the same benefits as its counterpart – it has lower production costs when compared with similar ferritic and austenitic grades and due to the materials increased tensile and yield strength, in many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.
2507 is the most common SuperDuplex alloy which contains 24% chromium and a minimum of 3% molybdenum. Please refer to the chemical composition and mechanic properties tables below. For information on Duplex alloy please click here.
Mechanical Properties of S32750
| DESCRIPTION | DUPLEX 2205 |
| Proof Stress 0.2% (MPa) | 450 |
| Tensile strength (MPa) | 620 |
| Elongation A5 (%) | 20 |
| Hardness |
HB: 293 HRB: 96 (according to Rockwell C Scale) |
Chemical Composition of S32750
| UNS No | S32750 |
| EN | 1.4410 |
| AISI | 2507 |
| Carbon (C) | 0.030 |
| Silicon (Si) | 0.80 |
| Manganese (Mn) | 1.20 |
