Stainless Steel - Martensitic - 1.4125 (440C) Bar

Stainless Steel - Martensitic - 1.4125 (440C) Bar

Stainless Steel - Martensitic - 1.4125 (440C) Bar 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...
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Stainless Steel - Martensitic - 1.4125 (440C) Bar

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.

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. 

Chemical Composition

Spec: EN 10088-3:2005  1.4125 Steel

Chemical Element% Present

Carbon (C)

0.95 - 1.20

Chromium (Cr)

16.00 - 18.00

Manganese (Mn)

1.00 max

Silicon (Si)

1.00 max

Phosphorous (P)

0.04 max

Sulphur (S)

0.03 max

Molybdenum (Mo)

0.40 - 0.80

Iron (Fe)

Balance


Properties

Physical PropertyValue

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

0.06 x10^-6 Ω .m


Spec: EN 10088-3:2005

Bar - Up To 100mm Dia or Thickness

Mechanical PropertyValue

Proof Stress

448-1900 MPa

Tensile Strength

758-2030 MPa

Elongation A50 mm

4-14 %


Alloy Designations

440C

UNS44004

1.4125


Applications

Typical applications include:

Rolling element bearings

Valve seats

High quality knife blades

Surgical instruments

Chisels


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