Martensitic Stainless Steel 440C    

Stainless Steel 440C ( 1.4125 ) is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make SS440C particularly suited to such applications as ball bearings and valve parts.

  • Hardenable high-carbon chromium steels designed to provide stainless properties with maximum hardness
  • Have maximum hardness together with high strength and corrosion resistance in the hardened and stress relieved condition
  • Always used in the hardened or hardened and stress relieved conditions
  • None of the alloys has its full corrosion resistance either in the annealed or in the hardened and tempered condition
  • Wide applications where good corrosion resistance along with high hardness or abrasion resistance is required

 

  • 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
  1. ASTM 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

Applications of stainless Steel 440C

  • Used in numerous applications in areas where a very hard and abrasion resistant stainless is called for
  • Applications include pivot pins, dental and surgical instruments, cutlery valve parts, ball bearings, nozzles, hardened steel balls and seats for oil well pumps, plus valve parts

Corrosion Resistance

These stainless steels have good corrosion resistance in the hardened and stress relieved conditions.  Hence, they should, usually, be used only in that condition. These steels are resistant to such conditions as fresh water, steam, crude oil, gasoline, perspiration, and alcohol.

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