440F Se Stainless Steel
At a Glance
| Property | Details |
|---|---|
| Available Forms | Round Bar |
| Alloy Type | Free-Machining High-Carbon Martensitic Stainless Steel |
| Corrosion Resistance | Moderate corrosion resistance in mild environments; lower than 440C due to free-machining additions |
| Hardness | Heat treatable to high hardness levels for strength, wear resistance, and edge retention |
| Durability | Good strength and wear resistance for precision-machined components |
| Machinability | Excellent machinability with improved surface finish due to selenium addition |
| Key Advantages | Free machining, fine surface finish, heat-treatable hardness, tight-tolerance capability, and good dimensional precision |
| Common Applications | Medical instruments, dental instruments, valves, fittings, fasteners, shafts, precision tools, taps, dies, and automotive components |
| Specifications | AMS 5632 Type 2, ASTM A582, UNS S44023 |
Introduction to 440F Se Stainless Steel
440F Se Stainless Steel is a free-machining version of 440 stainless steel, enhanced by the addition of selenium for improved machinability and surface finish. This grade offers a useful balance of hardness and ease of machining, making it well suited for high-precision parts. It is commonly used in applications such as medical instruments, valves, and fasteners, where a smooth finish and tight tolerances are important.
Machinability and Surface Finish
440F Se Stainless Steel is known for its excellent machinability, achieved by adding selenium to the alloy. This addition provides a finer surface finish compared to many standard martensitic stainless steels, making 440F Se useful for precision applications requiring smooth surfaces.
The alloy is well suited for high-volume production and complex parts where ease of machining, consistent finish, and dimensional accuracy are priorities.
Strength, Hardness, and Moderate Corrosion Resistance
440F Se retains good hardness and strength after heat treatment, making it suitable for components that require both durability and machinability. While its corrosion resistance is slightly lower than 440C due to the selenium addition, it performs well in mild environments and applications where corrosion resistance is secondary to machinability.
Differences Between 440 Grades
440F Se differs from 440C and standard 440F primarily due to the addition of selenium, which improves machinability and surface finish. Unlike 440C, which is generally selected for maximum hardness, wear resistance, and better corrosion resistance, 440F Se is tailored for ease of machining in precision applications.
Compared with standard 440F, 440F Se is often selected when a finer machined finish is desired. This makes it suitable for applications requiring high accuracy, smooth surfaces, and repeatable production.
Applications of 440F Se Stainless Steel
440F Se Stainless Steel’s free-machining qualities and fine surface finish make it useful for a variety of applications:
- Medical Instruments: Used in precision surgical tools and dental instruments that require high machinability and a smooth finish.
- Valves and Fittings: Suitable for high-precision parts requiring both strength and machinability.
- Fasteners: Commonly used in fasteners where tight tolerances and a polished finish are needed.
- Automotive Components: Suitable for shafts, fittings, and other parts that require high machining accuracy.
- Industrial Tools: Useful for manufacturing precision tools, taps, dies, and other machined components.
Buy 440F Se Stainless Steel from M. Vincent
At M. Vincent, we supply 440F Se Stainless Steel in round bar to meet the demands of industries like medical, automotive, and tooling. We offer competitive pricing, quick delivery, and expert support to help you get the right material for your project. Contact us today for more information or to request a quote.
Chemical Data, Mechanical Properties and Specifications for 440F Se Stainless Steel
Chemical Range for 440F Se
| Element | Minimum | Maximum |
|---|---|---|
| Carbon | 0.95 | 1.20 |
| Chromium | 16.0 | 18.0 |
| Iron | Balance | -- |
| Manganese | -- | 1.25 |
| Molybdenum | -- | 0.60 |
| Nickel | -- | 0.75 |
| Nitrogen | -- | 0.08 |
| Phosphorus | -- | 0.04 |
| Selenium | -- | 0.15 |
| Silicon | -- | 1.00 |
| Sulphur | -- | 0.030 |
Typical Mechanical Properties for 440F Se
| Form | Tensile Strength | Yield Strength | Elongation at Break |
|---|---|---|---|
| Annealed Bar | 103 ksi | 65 ksi | 14% |
Specifications
- AMS 5632 Type 2
- ASTM A582
- UNS S44023