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AISI 440C - EN 1.4125

AISI 440C - EN 1.4125

AISI 440C - EN 1.4125 is able to attain, through heat treatment, the greatest strength, hardness, and wear resistance out of all stainless alloys, due to its highly elevated carbon content. It is especially suited to applications like ball bearings and valve parts.

Equivalent grades

• DIN 1.4125
• UNS S44004
• X105CrMo17
• Z100CD17

Chemical Composition Reference


Physical Property Reference

• 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

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

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AISI 440C - EN 1.4125

Essential details
AISI 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.

Typical Applications:

- Chisels

- Surgical equipment

- High quality knife blades

- Valve seats

- Rolling element bearings

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