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Part Number

Hardenable Stainless Chromium Steel

Chemical Composition Limits

Weight %  C Cr Mo Si Mn S Fe



0.95-1.20 16.00-18.00 0.80 Max  1.00 Max  1.00 Max  0.015 Max   Rem

Other Chemically similar Specifications 

Weight %  C Cr Mo Si Mn S Fe
WS 1.4125 0.95-1.20 16.00-18.00 0.80 Max   1.00 Max  1.00 Max  0.015 Max   Rem
X 105 CrMo 17 0.95-1.20 16.00-18.00 0.80 Max   1.00 Max  1.00 Max  0.015 Max   Rem
AISI 440C~ 0.95-1.20 16.00-18.00 0.80 Max   1.00 Max  1.00 Max  0.015 Max   Rem

Chronifer M-17C material is Manufactured in Rod, Bar and coil

AISI 440C ~  Stainless Steel


Material Features

High carbon chromium steel designed to provide stainless properties with maximum hardness.  After heat treatment type 440C attains the highest hardness of any stainless steel (about 60 HRC).  This stainless steel principally has been used in bearing assemblies including bearing balls and races.  In addition, it should be considered for cutlery, needle valves, ball check valves, etc.




Coil: Cold drawn and polished: 10-35kg/coil

Bars: 0-1.99mm : Cold drawn and polished

Bars 2.00-16mm: Cold drawn, ground and polished.



Bars Length

in 3m 92m) Surface roundness N5-N6



Standard Tolerances

Diameter h8 (h7)

Out of roundness/cylindricity: 1/2 of dia tolerance

Tolerance in length :+/- 30mm



Tensile Strength

Before heat treatment: depending on the diagram 750-950n/mm2



Heat Treatment

Hardening: 1030-1070C

Soft Annealing: 843-871C slow furnace cooling

Max obtainable hardness 60 HRC



Cutting Rate

15-25 m/min (approximate value, depending on the lubrication oil, the cutting tools, the shape of parts)




Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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