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Special Steels

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Martensitic stainless steels

Steel Grade Chemical Composition (%) Properties Heat treatment Hardness Main application
NACHI AISI
SAE		 JIS C Si Mn Cr

Anne
aling
(°C)

Austeni
tizing
(°C)

Temp
ering
(°C)

 Annealed hardness
(HB)		 Practical hardness
(HRC)
440C 440C SUS440C 1.05 0.5   18.5 High corrosion resistance and
High wear resistance		 800-920 SC 1010-
1070
OQ		 100-
180
AC		 Max269 58-62 High grade blades
13RA     0.65 0.2 0.2 13.0 High corrosion resistance 830-
870
SC		 1000-
1050
OQ		 150-
200
AC		 Max223 53-57 Blade of a knife
SC:Slow cooling OQ:Oil cooling AC:Air cooling
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