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Reference Tables -- Martensitic Stainless Steel Alloy Designations
Martensitic stainless steels, typified by types 410/420/440, containing about 12Cr and 0.1C wt% as the basic composition. They are not as corrosion resistant as the other classes, but are extremely strong and tough as well as highly machineable, and can be hardened by heat treatment. They contain 11.5 to 18% chromium and significant amounts of carbon. Some grades include additional alloying elements in small quantities.

Martensitic Stainless Steels
Grade C Mn Si Cr Ni Mo P S Comments/Applications
410
0.15
1.0
0.5
11.5-13.0
-
-
0.04
0.03
The basic composition. Used for cutlery, steam and gas turbine blades and buckets, bushings...
416
0.15
1.25
1.0
12.0-14.0
-
0.60
0.04
0.15
Addition of sulphur for machinability, used for screws, gears etc. 416 Se replaces sulphur by selenium.
420
0.15-0.40
1.0
1.0
12.0-14.0
-
-
0.04
0.03
Dental and surgical instruments, cutlery....
431
0.20
1.0
1.0
15.0-17.0
-
1.25-2.0
0.04
0.03
Enhanced corrosion resistance, high strength.
440A
0.60-0.75
1.0
1.0
16.0-18.0
-
0.75
0.04
0.03
Ball bearings and races, gauge blocks, molds and dies, cutlery.
440B
0.75-0.95
1.0
1.0
16.0-18.0
-
0.75
0.04
0.03
As 440A, higher hardness
440C
0.95-1.20
1.0
1.0
16.0-18.0
-
0.75
0.04
0.03
As 440B, higher hardness

 

 

 

 

 

 


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