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Martinensitic Stainless Steels

MartinensiticStainlessSteelsChart.pdf

400 Series 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 corosion 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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