ALLIAGES DE NICKEL 59
Alloy 59, developed by ThyssenKrupp VDM GmbH, is a nickel-chromium-molybdenum alloy with an very lower carbon and silicon content. Alloy 59 has excellent corrosion resistance to wide range of corrosive media and high mechanical strength, so widely used in an assortment of harsh environments.
Chemical Composition (wt. %)
- Outstanding resistance to a wide range of corrosive media under oxidizing and reducing conditions.
- Excellent resistance to pitting and crevice corrosion from chloride-induced stress corrosion cracking.
- Excellent resistance to mineral acids, such as nitric, phosphoric, sulfuric acid, hydrochloric acids and in particular their mixtures.
- Excellent resistance to contaminated mineral acids.
- Good corrosion resistant to hydrochloric acid over the whole concentration range up to 104°F (40°C).
- Chemically stable, low susceptibility against intergranular corrosion.
- Chemical industry: components in chemical processes involving chlorides, particular when acid chloride catalysts are employed; reactors for acetic acid and acetic anhydride; sulfuric acid cooler etc.
- FGD system: Scrubbers, heat exchangers, dampers, wet fans and spraying systems for flue gas desulfurization (FGD) in coal-fired power stations and waste incineration plants.
- Pulp & paper: digesters and bleaching plants.
- Oil & gas: equipment and components in sour gas service.
Fabrication and Heat Treatment
Alloy 59 can be readily formed using various cold and hot working processes.
Details to see « FABRICATION INSTRUCTIONS FOR HIGH-ALLOYED AUSTENITIC STEELS AND NICKEL ALLOYS »
Alloy 59 can be joined to itself and to many other metals by conventional welding processes. These include GTAW (TIG), plasma arc, GMAW (MIG/MAG and MAG-Tandem) and SMAW (MMA). Pulsed arc welding is the preferred technique. For the MAG processes, the use of a multi-component shielding gas (Ar+He+H2+CO2) is recommended.
For welding, alloy59 should be in the annealed condition and be free from scale, grease and markings.