welding-alloys.com 35 Nickel based alloys Superalloys, also known as heat-resistant alloys or high-temperature alloys, are classified into different groups. Nickel based and cobalt based make up part of them. Nickel based superalloys have the ability to maintain high creep strength, oxidation and corrosion resistance at high service temperatures (up to about 1100°C). Regarding hardfacing applications, our nickel based superalloy cored wires are 100% compatible with open-die forging applications (such as shafts, presses or hammers). There are two metallurgical reasons as to why these nickel based superalloys perform so highly. First, elements such as molybdenum, tungsten, cobalt and chromium have been proven to strengthen solid solutions, and will favour the high temperature strength of the welding deposit. Product Composition [%] - Ni balance Hardness -3 layers C Mn Si Cr Fe Mo W Others as welded work hardened STELLOY C 0.02 0.6 0.8 16 4 16 5 200 HB 350 HB STELLOY CCo 0.02 1.2 0.6 15.5 2 16 4.4 Co: 2.3 220 HB 350 HB STELLOY Ni520 0.06 0.1 0.2 13 1.5 6 1 Co: 11.5 Ti: 3 Al: 2 250 HB 38 - 42 HRC STELLOY Ni519Co2 0.03 0.1 0.1 20 0.4 6.1 1 Co: 12 Ti: 3 Al: 2 250 HB 32 - 40 HRC The technical datasheets for these products are available on our website. The safety datasheets are also available on request. Second, elements such as titanium and aluminium will have an age hardening effect by forming a face-centred cubic structure, providing maximum strength through precipitation. Several studies involving nickel based superalloys have shown that these welding deposits can be difficult to work with because they have a tendency to crack during welding. By controlling the chemical analysis of our cored wires (e.g. aluminium to titanium ratio), Welding Alloys helps customers ensure they stay in the safest zone, whilst also achieving the expected hardfacing deposit. Back to contents page
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