Custom 455 is an iron-base superalloy with a chrome-nickel-titanium-niobium and copper composition, designed for elevated temperature strength and oxidation resistance. Depending on the application, Custom 455 may offer superior corrosion and wear resistance compared to conventional stainless steels.
Custom 455 is produced in standard bar, plate and extrusions, and custom created steel components for aerospace and medical applications. Common end uses for Custom 455 include turbine components, aircraft, medical instrumentation and nuclear reactors.
This alloy is composed of a minimum of 15.00 percent chromium, 19.25 percent nickel, .50 percent titanium, .50 percent niobium, 1.25 percent copper, and balance iron. Carbon ranges from 1.00 to 1.40 percent and the amount of nitrogen is normally in the range of 0.12 to 0.20 percent. Custom 455 can be heat treated to stronger properties through austenitizing and precipitation hardening, but may require post weld ageing be to obtain the best mechanical properties.
Custom 455 has a microstructure that isof extraordinarily small and fine-grained, which makes it ideal for complex-shaped parts that require a uniform response to heat treatment. The combination of chromium, nickel, titanium and niobium helps create a martensitic grain structure, which increases strength and corrosion resistance. The alloy is also very wear resistant and resistant to oxidation at high temperatures, making it an ideal material for applications that require these qualities.
Custom 455 has a relatively high yield strength (between 310 and 800 Mpa) and tensile strength (between 800 and 1250 Mpa) which is well suited for applications requiring high strength and wear resistance. The alloy also has a high hardness ranging from 180 to 270 HB and an excellent ductility, especially when compared to other similar materials. In addition, the material is highly resistant to corrosion, especially when compared to traditional stainless steel. The alloy is also very resistant to heat, making it a suitable choice for components that operate at elevated temperatures.
The addition of copper and titanium to the alloy improves its creep resistance, which is used to design parts that will not suffer from deformation when exposed to high temperatures over time. This alloy also exhibits a high fatigue strength and is ideal for applications requiring frequent start-up and shutdown cycles.
Overall, Custom 455 is an excellent high-performance material for applications requiring exceptional strength, wear resistance, corrosion resistance and thermal stability. It is also an ideal choice for complex-shaped parts that require a uniform response to heat treatment.
