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Stainless Steel 440C
Material Type
Metal
Material Name
Stainless Steel 440C
Alternative Names
S44004 | 1.4125 | X105CrMo17
Process Compatibility
CNC Milling, CNC Turning
introduction
Stainless Steel 440C in CNC Machining
Stainless Steel 440C is a high-carbon chromium steel. It has excellent hardness, wear resistance, and corrosion resistance.
Since 440C is a hardened steel, we use coated carbide tools in our cutting operations. We use lower cutting speeds and higher feed rates to prevent excessive tool wear. We use coolant to dissipate heat generated during machining and to extend tool life. We do a pre-heat treatment before the final heat treatment to lessen hardness. We have a rigid machine setup to minimize vibrations and maintain dimensional accuracy.
We use multiple shallow passes instead of a single deep pass when using step-downs. We do trochoidal milling techniques to help sustain a consistent chip load and minimize heat generation. We also do post-machining processes like grinding or polishing for a smoother finish. Post-machining heat treatment might be necessary depending on the final application and the impact of machining on material properties.
Properties
Properties Table of Stainless Steel 440C
| MECHANICAL PROPERTIES | |
|---|---|
| Ultimate Tensile Strength | 560-800 MPa |
| Yield Strength | 340-430 MPa |
| Young's Modulus(Elasticity) | 204-215 GPa |
| Elongation at Break | 14-18 % |
| Physical Properties | |
| Corrosion Resistance | Moderate |
| Magnetism | Magnetic |
| Weldability | Poor |
| Thermal Properties | |
| Thermal Expansion Coefficient | 10-10.2 x 10^-6/°C |
| Thermal Conductivity | 22-24.2 W/(m·°C) |
| Electrical Properties | |
| Electrical Resistivity | 60 μΩ*cm |
TECHNOLOGY OVERVIEW
Basic Knowledge of Stainless Steel 440C
What is Stainless Steel 440C?
Stainless Steel 440C is martensitic stainless steel with the highest carbon content among the 400 stainless steel series. 440C is the strongest, hardest, and most wear-resistant among the common 440-series stainless alloys.
With a carbon content higher than other steels in the 440 series, it can be heat-treated to achieve remarkable hardness. Although not as corrosion-resistant as some stainless steel, it still offers satisfactory corrosion resistance.
Advantages of Stainless Steel 440C
High Hardness
Excellent Wear Resistance
Good resistance to corrosion in moisture or mild corrosive environments.
Sharp Edge Retention
Can be heat-treated to adjust hardness and properties.
Exhibits good dimensional stability after heat treatment.
Used in various industries, including aerospace, medical instruments, cutlery, and bearings.
Magnetic properties which are useful for specific industrial and electronic applications.
Applications of Stainless Steel 440C
Ball Bearings
Cutting Tools
Aerospace Components
Surgical Instruments
Valve Components
Injection Molding Components
Bearings and Bushings
Molds for Plastics and Rubber
Tool and Die Making
FAQ
Machining Stainless Steel 440C Buying FAQ
440C has limited rust resistance. For better rust protection, consider using 302 or 316 stainless steel. While there might still be some discoloration, you shouldn't experience much red rust.
No, 440 and 440C are different grades of stainless steel. The main distinction lies in their carbon content. 440C stainless steel has a higher carbon content than 440, so it has increased hardness, wear resistance, and edge retention. 440C is generally considered a higher-end material, particularly for knife making.
440 steel, including 440C, is a popular choice for knife blades. It offers a good balance of corrosion resistance, hardness, and edge retention. 440C, in particular, is well-regarded for its high wear resistance and ability to maintain a sharp edge.
Compared to other stainless steel grades, 440 stainless steel, including 440C, is generally considered more affordable. It provides a good balance of performance characteristics at a reasonable cost.
Yes, 440C is used in some medical and dental instruments due to its hardness and corrosion resistance. However, for implants, corrosion-resistant alloys may be preferred.
Other Materials
Stainless Steel 420
Stainless Steel 420 is a type of strong and hard martensitic stainless steel with high durability.
More info about Stainless Steel 420
Stainless Steel 416
Stainless Steel 416 belongs to the martensitic stainless steel family. It is known for its strength and hardness.
More info about Stainless Steel 416
Stainless Steel 304
Stainless Steel 304 is a commonly used material in CNC machining. It is known for its corrosion resistance and mechanical properties.
More info about Stainless Steel 304
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