Background
Central Wire Industries Series Stainless 440C is a high-carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance.
440C is a machining and milling grade and is best used in high-abrasion environments, applications, and industries. It’s a preferred alloy for industries like Food and Drink, Medical, Construction, and Manufacturing.
Chemical Properties
After heat treatment, 440C's very high carbon content gives it the highest strength, hardness, and wear resistance of all the stainless alloys.
| Grade | Cr | C | Mn | Si | Mo | P | S | Fe | |
| 440C |
min. max. |
.16.0 18.0 |
0.95 1.2 |
- 1.0 |
- 1.0 |
-0.40 0.65 |
- 0.04 |
- 0.03 |
- Balance |
Physical Properties
440C is in the 440 stainless steel family. 440A and 440B are slightly softer, with less corrosion resistance. 440F requires higher machinability but has similar hardness and hardenability as 440C.
| Density |
Elastic Modulus |
Mean Coefficient of Thermal Expansion (mm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) |
Electrical Resistivity (nW.m) |
|---|---|---|---|---|---|
|
7650 |
200 |
0-100°C |
at 100°C |
|
|
|
|
|
10.1 |
24.2 |
460 |
600 |
Qualifying Specifications and Standards
| Standard | Designation |
| UNS | S44000 |
| AMS | 5352, 5630, 5880, 5618 |
| ASTM | A276 |
| BS | EN 10088 |
| DIN | 1.4125 |
Applications
Because of 440C’s high strength, hardness and wear resistance, this stainless steel is often used in high-wear applications like:
- Gage Blocks and Measuring Instruments
- Cutlery (Knives, Forks, Spoons)
- Ball Bearings and Races
- Molds and Dies
- Surgical Instruments
Availability & Forms
440C is a stocked product at Central Wire Industries. Lead times vary based on the processing required for finished form, but raw material is available at many Central Wire locations. Central Wire makes 440C Stainless Steel available in the following forms:
- Bar Stock
- Shaped/Profiled Wire
- Round Wire
Request a Quotation
Contact Central Wire Industries for product availability, alloy details, and help with finding the perfect grade for your application. Send an inquiry to sales@centralwire.com, or complete our inquiry form and we will assist as quickly as possible.
