440C stainless steel is a high-carbon martensitic stainless steel that is known for its high hardness, wear resistance, and corrosion resistance. It contains 17% chromium, which provides excellent corrosion resistance, and 1.1% carbon, which gives the steel its hardness. Additionally, it has added elements such as molybdenum and vanadium that enhance its properties.

440C stainless steel is commonly used in applications where high hardness and corrosion resistance are required. Some of the typical applications include:

1. Bearing and valve components – 440C stainless steel’s high hardness and wear resistance make it an ideal material for bearings and valve components that require high strength and durability.
2. Surgical instruments – 440C stainless steel’s corrosion resistance and biocompatibility make it a popular choice for surgical instruments, where it is used in applications such as scissors, forceps, and scalpels.
3. Cutlery and knives – 440C stainless steel’s high hardness and wear resistance make it an excellent choice for cutlery and knives, where it is prized for its ability to hold a sharp edge.
4. Aerospace components – 440C stainless steel’s high strength, hardness, and corrosion resistance make it suitable for aerospace components such as bearings, bushings, and fasteners.
5. Tool and die making – 440C stainless steel’s high hardness and wear resistance make it a popular choice for tool and die making, where it is used in applications such as punches, dies, and molds.

Overall, 440C stainless steel is a versatile material with a wide range of applications where high hardness, wear resistance, and corrosion resistance are required.