440C Stainless Steel Plate - UNS S44004
Type 440C (UNS S44004) is a martensitic stainless steel with high carbon and chromium content. Molybdenum improves the steel's deep hardening and toughness. It also enhances wear resistance. After heat treatment, it is capable of attaining the highest strength, hardness and wear resistance of all stainless alloys. 440C stainless steel derives its corrosion resistance from the inclusion of chromium and is comparable to grade 304.
United Performance Metals carries 440C plate sizes 0.1875" - 2.500". This material is commonly used in the medical industry for surgical instruments and is used for household utensils such as cutlery and measuring instruments. Other applications for this grade include nozzles, valve parts, hardened steel balls and seats for oil well pumps, separating screens and strainers, springs, shears, and wear surfaces.
- Inventory & Specs
- Chemical Composition
- Physical Properties
- Mechanical Properties
- Datasheet
- Additional Info
Inventory Size Ranges for 440C
| Type | Thickness | AMS Standards | ASTM | Get a Quote |
|---|---|---|---|---|
| Plate | 0.1875" - 2.500" | AMS 5630 (Chem Only) | ASTM A 276, ASTM A 480, ASTM F 899 | Get a Quote |
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Characteristics of 440C
Highest resistance can be achieved through hardening and polishing, and the properties of 440C steel make it ideal for knives and cutting instruments like surgical blades. It maintains good corrosion resistance to fresh water, foods, and mild acids. Once hardened, this material holds a sharp edge and resists corrosion, and it can be polished to a near mirror finish. Its toughness and ability to resist wear makes 440C stainless steel a good choice for tools like chisels and ball bearings. This alloy exhibits good corrosion resistance to atmospheric corrosion, potable water, and to mildly corrosive chemical environments because of its ability to form a tightly adherent oxide film which protects its surfaces from further attack. Its exposure to chlorides in everyday type activities (e.g., food preparation, sport activities...) is generally satisfactory when proper cleaning is performed after exposure to use.
Other industry standards we comply with:
- DFARS Compliant
Common Trade Names
- 440C Surgical Steel Plate
Industry Applications for 440C
- Cutting Instruments
- Knife Blades
- Surgical Instruments
- Chisels
- Measuring instruments
- Ball Bearings and Valves
Chemical Composition
Percent maximum unless a range is specified
| Element | Min | Max | |
|---|---|---|---|
| C | Carbon | - | 1.20 |
| Cr | Chromium | - | 18.0 |
| Mn | Manganese | - | 1.0 |
| Mo | Molybdenum | - | 0.75 |
| P | Phosphorus | - | 0.04 |
| Si | Silicon | - | 1.0 |
| S | Sulfur | - | 0.030 |
Physical Properties
- Density: 7650 kg/cm3
- Thermal Conductivity at 212°F (100°C): 24.2
- Electrical Resistivity: 600
- Elastic Modulus: 200 GPa
Mechanical Properties
- Yield Strength 0.2% Proof: 448 Mpa
- Tensile Strength: 75 Mpa
- Elongation % in 50mm: 14
- Hardness (HB): 269 max