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Alloy 440C

Due to the presence of substantial levels of chromium, stainless steels have a higher corrosion resistance than ordinary steels. They are classified as ferritic, austenitic, or martensitic steels based on their crystal line structure. Precipitation-hardened steels make up another type of stainless steel. These steels are a mix of martensitic and austenitic.

Grade 440C stainless steel is a martensitic stainless steel with a high carbon content. It has a high tensile strength, a moderate resistance to corrosion, and a high degree of hardness and wear resistance. Grade 440C has the highest strength, hardness, and wear resistance of all stainless alloys after heat treatment. Due to its extremely high carbon content, 440C is well-suited for applications such as ball bearings and valve parts.

Chemical Analysis :
Weight% (all values are maximum unless arange is otherwise indicated)

Type C Mn Si P S Cr Mo
440C 0.95min.
1.00max 1.00max 0.040max 0.030max min:16.00
max: 18.00

Mechanical Properties :

Tempering Temperature(°C) Tensile Strength(MPa) Yield Strength 0.2% Proof(MPa) Elongation(%in 50mm) Hardness Brinell(HB) Impact CharpyV(J
Annealed * 758 448 14 269HBmax#
204 2030 1900 4 59 9
204 2030 1900 4 59 9
204 2030 1900 4 59 9
260 1960 1830 4 57 9
316 1860 1740 4 56 9
371 1790 1660 4 56 9
Annealed properties are typical for Condition A of ASTMA276# Brinell Hardness is ASTMA276 specified maximum for annealed 440A, B and C


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