1.4529, N08926, Alloy 926, Stainless Steel
The austenitic stainless steel 1.4529 was developed on basis of Alloy 904l / 1.4539. However, the molybdenum content at 6Mo was raised to 6.5%. 6Mo has excellent general corrosion resistance and improved resistance to pitting and crevice corrosion. The resistance to stress corrosion cracking is also increased. It is often referred as super austenitic stainless steel.
Characteristics
1.4529 is characterized by:
- increased resistance to stress corrosion cracking compared to other austenitic stainless steels
- excellent general corrosion resistance in use of oxidizing as well as reducing media
- less tendency to form intermetallic phases compared to similar steels with only 18% nickel content
- very good resistance at pitting and crevice corrosion
- Approval for pressure vessels with temperatures between -196 and 400 ℃
- Building construction approval for components and fasteners made of stainless steel
Grade
| Werkstoffnummer | 1.4529 |
| Alloy | Alloy 926 |
| Alloy 6XN | |
| EN short name | X1 NiCrMoCuN25-20-7 |
| UNS | UNS N08926 |
| UNS N08367 | |
| Registered Tradenames | SixMo® |
| Ultra 6XN® | |
| AL-6XN® | |
| Cronifer 1925hMo® | |
| Standards | EN 10028-7 |
| EN 10088-2 | |
| VdTÜV Werkblatt | 502 |
| ASTM / ASME | ASTM A240/ B688/ B625 |
| ASME SA24/ SB688/ SB625 |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo | Cu | Ni | N | |
| Min | – | – | – | – | – | 19.50 | 6.00 | 0.85 | 24.50 | 0.12 |
| Max | 0.02 | 0.80 | 1.00 | 0.03 | 0.01 | 21.00 | 6.70 | 1.00 | 26.00 | 0.20 |
Main fields of application of alloy 926
1.4529 is mainly in following applications:
- Concentration and crystallization plants for salt production by evaporation
- Condenser pipes and pipeline systems in power plants with highly polluted cooling water
- Pump rods for oil delivery systems
- Evaporators, heat exchangers, tank linings etc. and phosphoric acid production
- Tanks for transport of aggressive chemical products
- Distribution systems and coolers for sulfuric acid plants
- Fire extinguishing systems, seawater filtration, hydraulic and injection systems of offshore technology
- Flexible pipes in the offshore industry
Hot forming
The material is hot formed within a temperature range of 1200 and 900 ℃and afterwards quenched rapidly in water or air.
The annealing takes place at 1200 ℃.
After hot forming, heat treatment for optimum corrosion resistance is recommended.
