440C Steel

Steel name: 440C
Diagram No.: 2005
Mat.No. (Wr.Nr.) designation: 1.4125
AISI/SAE designation: 440C
AFNOR designation: Z100 CD 17
AMS designation: 5618
UNS designation: S44004
Chemical composition in weight %: 1.145% C, 0.552% Si, 0.492% Mn, 16.010% Cr
Steel group: Stainless steels
Applications: No data
Comment: No data
Reference: Abeer Adel Salih, Mohd Zaidi Omar, Syarif Junaidi and Zainuddin Sajuri, Effect of Different Heat Treatment on the SS440C Martensitic Stainless Steel, Australian Journal of Basic and Applied Sciences, 5(12): 867-871, 2011.

Heat Treatment
Hardening: See the text bellow.
Tempering: See the diagram.
Note: SS440C martensitic stainless steel that can be heat treated to provide a wide range of hardness value. The first procedure for heat treated involves austenitizing process by heating the sample at 1150C for 60 min, follow heating again at 1100C for 30 min, quenched the sample produced martensitic structure. Higher austenitizing temperature was sufficient to transform the steel into austenite and to form martensite phase upon quenching. The second procedure involves tempering process. To exam the tempered martensite and ferrite phase the tempering temperature was chosen varied between (400-700)C for 1 hr.

Tempering Diagram

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