Data Sheets

Stainless Steel   |   Martensitic

1.4125 (440C) Bar

Commercial440C EN1.4125

Grade 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make 440C particularly suited to such applications as ball bearings and valve parts.

Grades 440A and 440B are identical except for slightly lower carbon contents (0.60 - 0.75% and 0.75 - 0.95% respectively); these have lower attainable hardnesses but slightly higher corrosion resistances. Although all three versions of this grade are standard grades, in practice 440C is more available than the A or B variants.

A free-machining variant 440F (UNS S44020) also exists, with the same high carbon content as 440C. Again this grade is not readily available in Australia.

Martensitic stainless steels are optimised for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually also allow for a final harden and temper heat treatment. Corrosion resistance is lower than the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.

Chemical Composition

EN 10088-3:2005
1.4125 Steel
Chemical Element % Present
Iron (Fe) balance
Sulphur (S) 0.03 max
Phosphorous (P) 0.04 max
Molybdenum (Mo) 0.4 - 0.8
Manganese (Mn) 1 max
Silicon (Si) 1 max
Carbon (C) 0.95 - 1.2
Chromium (Cr) 16 - 18

Alloy Designations






Supplied Forms

  • Bar

Generic Physical Properties

Physical Property Value
Density 7.65 g/cm³
Thermal Expansion 10.1 x10^-6 /K
Modulus of Elasticity 200 GPa
Thermal Conductivity 24.2 W/m.K
Electrical Resistivity 0.6 x10^-6 Ω .m

Mechanical Properties

EN 10088-3:2005
Bar - Up To 100mm Dia or Thickness
Mechanical Property Value
Proof Stress 448-1900 MPa
Tensile Strength 758-2030 MPa
Elongation A50 mm 4-14 %

Mechanical properties vary greatly according the heat treatment that the material has undergone


Typical applications include:

Rolling element bearings

Valve seats

High quality knife blades

Surgical instruments



In the annealed condition this grade is relatively easily  machined; approximately the same as for high speed steel. Chips are tough and  stringy so chip breakers are important. If these grades are hardened  machining becomes more difficult and probably impossible.

Corrosion Resistance

Good resistance to the atmosphere, fresh water, foods,  alkalies and mild acids. Best resistance in the hardened and tempered and  passivated condition. A smooth polished surface also assists.


The corrosion resistance of grade 440C approximates that  of grade 304 in many environments.

Heat Treatment

Annealing - Full  anneal - 850-900°C, slow furnace cool to about 600°C and then air cool.  Sub-critical Annealing - 735-785°C and slow furnace cool.

Hardening - Heat  to 1010-1065°C, followed by quenching in warm oil or air. Oil quenching is  necessary for heavy sections. Immediately temper at 150-370°C to obtain a  wide variety of hardness values and mechanical properties as indicated in the  accompanying table.

Tempering in the  range 425-565°C is to be avoided because of reduced impact resistance and  corrosion resistance. Tempering in the range 590-675°C results in lower  hardness (the product become machinable) and high impact resistance.

Heat Resistance

Not recommended for use in temperatures above the relevant  tempering temperature, because of reduction in mechanical properties by  over-tempering.


If welding is necessary pre-heat at 250°C and follow welding  with a full anneal. Grade 420 filler will give a high hardness weld (although  not as high as the 440C), but 309 or 310 will produce soft welds with higher  ductility.