K435 cast alloy excellent mechanical properties corrosion resistance for aerospace, automotive, industrial
K435 cast alloy is a nickel based precipitation hardening equiaxed crystal cast high-temperature alloy with high high-temperature strength and good heat and corrosion resistance.
The operating temperature range of K435 alloy is below 900 ℃. Its composition includes about 18.5% (Co+W+Mo), 7.5% (Al+Ti+Nb), and 16% Cr, as well as various trace elements, which improve the performance of the alloy through solid solution strengthening, precipitation strengthening, and grain boundary strengthening. The thermal corrosion resistance of this alloy is superior to K438 and IN738 alloys. In a specific anti thermal corrosion test, the average corrosion depth of K435 alloy is only 11.4 μ m. In a mixed salt of 90% Na2SO4+10% NaCl, the average corrosion rate of hot corrosion at 900 ℃ for 200 hours is only 0.28mg/(cm ² · h).
The application overview of K435 alloy includes the production of high-temperature components such as turbine guide vanes for power generation or naval gas turbines below 900 ℃. The casting performance of the alloy is good, and the investment casting method can be used to cast complex thin-walled hollow blades. In addition, K435 alloy is non-magnetic, has good forming process and welding performance, and is suitable for various high-temperature working environments.
Overall, K435 cast mother alloy has a wide range of application prospects in the manufacturing of high-temperature components due to its excellent high-temperature strength and heat corrosion resistance
The chemical composition of K435 casting mother alloy includes elements such as carbon (C), chromium (Cr), nickel (Ni), cobalt (Co), tungsten (W), molybdenum (Mo), aluminum (Al), titanium (Ti), niobium (Nb), iron (Fe), boron (B), zirconium (Zr), etc.
Specifically, the chemical composition and mass fraction of K435 alloy are roughly as follows:
The mass fraction of carbon (C) is 0.06-0.12%
The mass fraction of chromium (Cr) is 15.00-16.70%
The mass fraction of nickel (Ni) is the remainder
The mass fraction of cobalt (Co) is 10.00-12.50%
The mass fraction of tungsten (W) is 4.50-6.50%
The mass fraction of molybdenum (Mo) is 1.50-2.50%
The mass fraction of aluminum (Al) is 2.40-3.20%
The mass fraction of titanium (Ti) is 3.0-3.5%
The mass fraction of niobium (Nb) is 0.60-1.1%
The mass fraction of iron (Fe) is ≤ 0.50%
The mass fraction of boron (B) is 0.005-0.015%
The mass fraction of zirconium (Zr) is 0.05-0.15%
| C | Cr | Ni | Co | W | Mo | Al |
| 0.06-0.12% | 15.00-16.70% | remainder | 10.00-12.50% | 4.50-6.50% | 1.50-2.50% | 2.40-3.20% |
The addition of these elements in K435 alloy endows the alloy with high high-temperature strength and good heat and corrosion resistance through solid solution strengthening, precipitation strengthening, and grain boundary strengthening. In addition, K435 alloy also has excellent thermal corrosion resistance, which is superior to K438 alloy and IN738 alloy.
K435 cast alloy excellent mechanical properties corrosion resistance for aerospace, automotive, industrial.
The advantages of K435 cast mother alloy mainly include high temperature strength, good heat and corrosion resistance, excellent oxidation resistance, and a wide range of application fields.
High temperature strength: K435 alloy has high high-temperature strength by adding approximately (Co+W+Mo) 18.5%, (Al+Ti+Nb) 7.5%, Cr16%, and various trace elements for sufficient solid solution strengthening, precipitation strengthening, and grain boundary strengthening. This strength enables it to maintain good mechanical properties even in high temperature environments, making it suitable for manufacturing high-temperature components below 900 ℃.
Heat and corrosion resistance: K435 alloy has better heat and corrosion resistance than K438 alloy and IN738 alloy. In the same conditions of thermal corrosion resistance test, the average corrosion depth of K435 alloy is only 11.4 μ m; In a mixed salt of 90% Na2SO4+10% NaCl, the average corrosion rate during 900 ℃ × 200h hot corrosion is only 0.28mg/(cm ² · h), demonstrating its excellent heat and corrosion resistance.
Antioxidant performance: Elements such as chromium and molybdenum in the alloy can form a dense oxide film, effectively preventing further oxidation and corrosion of the alloy surface, and improving the corrosion resistance of the alloy. At the same time, elements such as tantalum in the alloy can effectively improve its oxidation resistance, delay the oxidation rate of the alloy at high temperatures, and extend its service life.
Application field: K435 alloy has become one of the ideal materials for high-temperature environments due to its excellent performance characteristics, and is widely used in high-temperature components such as turbine blades and guide vanes of gas turbines. In addition, the application of laser additive technology has further expanded its application in repairing precision and complex components, achieving high-quality repair of blades and ensuring the stable operation of gas turbines and aerospace engines.
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