Inconel617 alloy – solid solution strengthened nickel-chromium-cobalt-molybdenum alloy – high strength, high temperature resistance, oxidation and corrosion resistance
Inconel 617 alloy (UNS N06617): is a solid solution, strengthened nickel-chromium-cobalt-molybdenum alloy with excellent comprehensive high temperature strength and oxidation resistance. The alloy is easy to form and weld with existing technology. The high nickel and chromium content makes the alloy corrosion resistant in various reducing and oxidizing environments. The combined effect of aluminum and chromium provides the alloy with high temperature oxidation resistance, and cobalt and molybdenum give the alloy Solid solution strengthening ability.
Inconel617 alloy implementation standard
Bar, Wire and Forgings
ASTM B166/ASME SB166 (Rod, Bar and Wire),
ASTM B564/ASME SB564 (Forgings),
SAE AMS 5887(Bars,Forgings andRings),
VdTUV 485 (Sheet, Plate, Bar andTubing),
ISO 9724 (Wire),
DIN 17752 (Rod and Bar),
Hot rolled plate, cold rolled plate and strip
ASTM B 168/ASME SB168 (Plate, Sheet and Strip),
SAE AMS 5888 (Plate),
SAE AMS 5889 (Sheet and Strip),
VdTUv 485 (Sheet, Plate, Bar and Tubing),
ISO 6208 (Plate, Sheet and Strip),
DIN 17750 (Plate, Sheet and Strip)
Conveyor Tubes and Tubes
VdTUv 485 (Sheet, Plate, Bar, and Tubing),
ISO 6207 (Tubing),
ASTM B546/ASME SB546(Pipe),
DIN 17751 (Pipe and Tube)
Inconel617 alloy has high mechanical properties in a wide temperature range. One of its outstanding properties is the level of strength maintained at higher temperatures. The alloy’s resistance to high temperature corrosion enhances the use of its strength.
The excellent oxidation resistance of Alloy 617 comes from the chromium and aluminum content of the alloy. At higher temperatures, these elements form a thin subsurface oxide grain zone. When exposed to high temperature, this zone forms rapidly until it reaches 0.001 to 0.002 in. (0.025 to 0.05 mm) thick. This oxidized area provides suitable diffusion conditions for the formation of a protective chromium oxide layer on the metal surface, which at the same time helps prevent cracking of the protective layer.
Inconel617 processing and heat treatment
Inconel 617 alloy is easy to machine in various hot and cold working processes, however due to its high strength it requires high powered equipment.
1. Inconel 617 preheating
The surface of the material must be cleaned before and during heating to keep the surface clean. If the heating environment contains sulfur, phosphorus, lead or other low melting point metals, Inconel 617 alloy will become brittle. Impurities originate from marking paint, chalk, lubricating oil, water, fuel, etc.
The sulfur content of the fuel should be low. For example, the impurity content of liquefied petroleum gas and natural gas should be lower than 0.1%, the sulfur content of city gas should be lower than 0.25g/m3, and the sulfur content of petroleum gas should be lower than 0.5%.
The heating electric furnace should preferably have a more precise temperature control capability, the furnace gas must be neutral or weakly oxidizing, and the furnace gas composition should be avoided to fluctuate between oxidizing and reducing. The heating flame cannot directly burn to the workpiece. During all heating processes, the material must be added to the heated furnace.
2.Inconel 617 heat treatment
Due to the very high thermal intensity, considerable processing forces are required for hot working.
The suitable thermal processing temperature for Inconel 617 alloy is 1200-950°C. The cooling method can be water quenching or other rapid cooling methods. The material must be put into the furnace when the heating furnace reaches the maximum furnace temperature.
3. Inconel 617 cold working
Cold working should be carried out after annealing treatment. The work hardening rate of Inconel 617 is greater than that of austenitic stainless steel, so the processing equipment should be adjusted accordingly, and there should be an intermediate annealing process during cold working.
Final solution annealing is required when the cold deformation is greater than 10% or greater than 5% for materials with application temperatures above 900°C.
4. Inconel 617 heat treatment
In order to obtain suitable properties, the solution treatment temperature is 1150°C-1200°C, water quenching is necessary to obtain maximum creep resistance, and the thickness is less than 1.5mm can also be rapidly air-cooled, and the stress relief annealing temperature can reach 870°C. During all heat treatments, care must be taken to maintain cleanliness.
5. Inconel 617 grinding
The oxide near the welding seam of Inconel 617 workpiece is more difficult to remove than that of stainless steel. Mechanical or chemical methods can be used. When using mechanical methods, metal contamination and high surface deformation should be avoided. Before pickling in a mixed acid of nitric acid and hydrofluoric acid, it is also necessary to remove oxides with sandpaper or perform a salt bath pretreatment.
6. Inconel 617 machining
The machining of Inconel 617 needs to be carried out after solution treatment. Considering the work hardening of the material, Inconel 617 must use a lower surface cutting speed and heavy feed than low-alloy standard austenitic stainless steel.
7. Welding of Inconel 617
Inconel 617 alloy has excellent welding performance and can be welded by various welding methods, including tungsten electrode arc welding (GTAW/TIG), manual arc welding (GMAW/MIG), pulse arc welding and shielding gas arc weld.
Before welding, the material must be in a solid solution treatment state, and the surface of the material must be clean, free of oil, free of chalk marks, etc., within 25mm around the welding seam to expose bright metal, use low heat input, and the interlayer temperature should not exceed 150°C , no pre-weld or post-weld heat treatment is required. Recommended welding materials: welding wire: ERNiCrCoMo-1, welding rod: ENiCrCoMo-1.
Inconel617 application field
Suitable for high temperature and extremely high mechanical stress occasions, the recommended temperature does not exceed 1000°C.
Industrial and aviation gas turbine components
Muffle jars and radiant tubes
Spiral pipes and pipes in the petrochemical industry
High temperature gas cooling nuclear reactor
High temperature heat exchangers, valves and springs
Shanghai HY Industry Co., Ltdhas international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences. Years of experience in Corrosion Resistant Alloy & Superalloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.
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