440C Martensitic Stainless Steel (ASTM A276-2017)
440C is a high-carbon, high-chromium martensitic stainless steel with excellent hardness and wear resistance. After proper heat treatment, it can reach up to 60 HRC, making it one of the hardest stainless steels available. Its chemical composition (~1.0% C, 17% Cr) provides both high strength and good corrosion resistance, along with dimensional stability at elevated temperatures.
Key Features
Extremely high hardness (up to 60 HRC)
Good corrosion resistance in mild environments
Stable at elevated temperatures
Wear resistance for demanding applications
Typical Applications
Bearing components in corrosive or oxidizing atmospheres
High-quality cutting tools (surgical blades, scissors, knives, nozzles)
Needle valves, ball check valves, precision mechanical parts
Supply Condition
Available in all standard sizes with surface finishes including ground, peeled & polished, and turned & polished. Diameter tolerance ranges from +0/-0.02 mm to ±1 mm. Manufactured with stable raw materials from leading domestic steel mills, ensuring consistent quality and reduced customer machining time.
ZeYao Hardware is professional in production of 440C screws. Please contact us at sales@hky-hardware.com
