Expanding Applications of AISI 440C Stainless Steel.

440C stainless steel is a high-carbon martensitic stainless steel alloy. It belongs to the 400 series of stainless steels, which are known for their excellent corrosion resistance, high strength, and wear resistance. The “440” in its name represents the composition of the steel, which includes approximately 1% carbon content.

Standard of 440C Stainless Steel and Equivalent Steel Grades

Country USA BS & DIN Japan
Standard ASTM A276 EN 10088 JIS G4303
Grades S44004/440C X105CrMo17/1.4125 SUS440C

440C Steel Chemical Composition and Equivalent’s

Standard Grade C Mn P S Si Cr Mo
ASTM A276 S44004/440C 0.95-1.20 ≦1.00 ≦0.04 ≦0.03 ≦1.00 16.0-18.0 ≦0.75
EN10088 X105CrMo17/1.4125 0.95-1.20 ≦1.00 ≦0.04 ≦0.03 ≦1.00 16.0-18.0 0.40-0.80
JIS G4303 SUS 440C 0.95-1.20 ≦1.00 ≦0.04 ≦0.03 ≦1.00 16.0-18.0 ≦0.75

440C Stainless Steel Mechanical Properties

Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (% in 50mm) Hardness Rockwell (HRC) Impact Charpy V (J)
Annealed* 758 448 14 269HB max#
204 2030 1900 4 59 9
260 1960 1830 4 57 9
316 1860 1740 4 56 9
371 1790 1660 4 56 9

440C stainless steel is valued for its high hardness, corrosion resistance, and wear resistance, making it a popular choice in various industrial and commercial applications where demanding conditions are present.

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