Part Number WS 1.4125

Technical Data Sheet

Chemical Composition Limits
Weight % C Cr Mo Si Mn S Fe
CHRONIFER M-17C 0.95-1.20 16-18 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 16-18 0.80 max 1.00 max 1.00 max 0.015 max Rem
X 105 CrMo 17 0.95-1.20 16-18 0.80 max 1.00 max 1.00 max 0.015 max Rem
AISI 440C~ 0.95-1.20 16-18 0.80 max 1.00 max 1.00 max 0.015 max Rem

Chronifer M-17C is a hardenable stainless chromium steel which is manufactured in Rod, Bar and Coil. (AISI 440C ~ Stainless Steel). For all stock and size availability contact Sales.

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: Ø 0-1.99mm : Cold drawn and polished
Bars Ø 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: 1030-1070ºC
Soft Annealing: 843-871ºC 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)

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

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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.