Specifications
| 318S13 | 1.4462 | X2CrNiMoN22.5.3 |
| AFNOR Z2CND22.05Az | Sandvik SAF2205 | Norsok MDS D47 |
| ASTM A276 S31803/S2205 | ASTM A182 F51 / F60 | 22 Cr |
UNS S31803/S32205
Sanmac 2205 is an improved version of the duplex stainless steel Alloy 2205, known for its excellent machinability. It outperforms standard 2205 grades and other duplex alloys in machining applications by offering extended tool life and increased productivity. With its exceptional corrosion properties, Sanmac 2205 is highly suitable for environments containing chlorides and hydrogen sulfide. It is commonly used in sour wells, refineries, and process solutions contaminated with chlorides, making it ideal for oil and gas extraction. Sanmac 2205 is particularly well-suited for heat exchangers that utilize chloride-bearing or brackish water as a cooling medium. It also exhibits compatibility with dilute sulfuric acid solutions and the handling of organic acids like acetic acid and mixtures. The high strength of Sanmac 2205 makes it an attractive alternative to austenitic steels in structures subjected to heavy loads. Overall, the combination of good mechanical and corrosion properties of Sanmac 2205 makes it a cost-effective choice in various applications, reducing the life cycle cost of equipment.
Chemical Composition Limits
| Â | Cr | Ni | Mo | Co | Nb (+Ta) | Ti | V | W | Cu | C | Mn | N | Si | P | S | Fe | Al |
| Min | 22.00 | 4.50 | 3.00 | – | – | – | – | – | – | – | – | 0.14 | 0.20 | – | – | – | – |
| Max | 23.00 | 6.50 | 3.50 | – | – | – | – | – | – | 0.03 | – | 0.20 | 0.70 | 0.03 | 0.02 | Bal | – |
Mechanical Properties
| 0.2% Proof Stress | 450 N/mm2 | 65ksi |
| Tensile Strength | 655 N/mm2 | 95ksi |
| Elongation, 5.65√S0 | 25% | – |
| Reduction of area | 45% | – |
| Hardness (Brinell) | <270 | – |
| Impact Strength (Room Temp) | 80J (av) | – |
| Impact Strength (-46°C) : Longitudinal | <100mm 80J | – |
| 100-260mm 45J (35J min) | – | |
| >260mm For info only | – | |
| Impact Strength (-46oC) : Transverse | 50-260mm 45J (35J min) | – |
| >260mm For info only |
Physical Properties
| Density (Kg/m3) | 7810 |
| Magnetic Permeability (20°C) | <50 |
| Young’s Modulus (kN/mm2) | 190 |
| Specific Electrical Resistance, 20°C (µΩ.m) | 0.85 |
| Mean coefficient of thermal expansion, 20-300°C (m/m/oC) | 11 x 10-6 |
| Specific Heat, 20°C (J/kg.K) | 400 |
| Thermal conductivity, 20°C (W/m.K) | 15 |
Key Features
- Excellent machinability.
- High resistance to stress corrosion cracking (SCC) in chloride-bearing environments.
- High resistance to stress corrosion cracking (SCC) in environments containing hydrogen sulfide.
- High resistance to general corrosion, pitting and crevice corrosion.
- High mechanical strength – roughly twice the proof strength of austenitic stainless steels.
- High resistance to erosion corrosion and corrosion fatigue.
- Good weldability.
Applications
- Process industry components in sulphuric acid, nitric acid, phosphoric acid, ethylene oxide, polypropylene & PVC production.
- Equipment handling organic & fatty acids, chemical storage, tankers, heat exchangers.
- Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation.
- Oil and chemical tankers
- Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment, separators, heat exchangers.
- Pollution control systems, effluent scrubbing, flue gas desulphurisation (FGD).
- Waste water treatment, sour water purification
- Pulp & paper industry applications such as pulp liquor heaters, bleach tower linings, digesters, brownstock washers.
- Food industry applications including brewery piping, evaporators, hot liquor tanks, presses.