General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Grade 440 stainless steels exhibit excellent resistance to mild acids, alkalis, foods, fresh water and air. A smooth polished surface also helps grade 440 steels resist corrosion in tempered, passivated and hardened conditions. All three forms of grade 440 steels are commonly used. However, grade 440C is more readily available than the other standard grades. Grade 440F, a free-machining type of grade 440 series, is also available with a high carbon content similar to that of grade 440C. Martensitic steel grades are high-hardness steels, usually fabricated using techniques that require hardening and tempering treatments.
Grade 440C stainless steels are high carbon steels, which attain the highest hardness, wear resistance and strength of all stainless steel grades after heat treatment. These properties make this grade suitable for applications such as valve components and ball bearings. Grade 440A and 440B stainless steels, on the other hand, have similar properties – except for a slightly lower percentage of carbon in grade 440A.
Features
- Hardenable chromium steel
- High strength
- High wear resistance
Standard Inventory Specifications
- UNS S44004
- AMS 5630 Chem Only
- ASTM: A480
Common Trade Names
- 440C Surgical Steel
Common Applications of 440C
- Cutting Instruments
- Knife Blades
- Surgical Instruments
- Chisels
- Measuring instruments
- Ball Bearings and Valves
Chemical Composition
Chemical Properties of 440C Stainless Steel
Element
Percent by Weight
C
Carbon
1.20%
Cr
Chromium
18%
Mn
Manganese
1%
Mo
Molybdenum
0.75
P
Phosphorous
0.04
Si
Silicon
1%
S
Sulfur
0.030%
Physical Properties
Physical Properties of 440C Stainless Steel
Density kg/mᶟ | 7650 |
Thermal Conductivity at 212°F (100°C) | 24.2 |
Thermal Conductivity at 932°F (500°C) | – |
Electrical Resistivity | 600 |
Elastic Modulus (Gpa) | 200 |
Mechanical Properties
Mechanical Properties of 440C Stainless Steel
ANNEALED | ||
Yield Strength 0.2% Proof (Mpa) | 448 | |
Tensile Strength (Mpa) | 75 | |
Elongation (% in 50mm) | 14 | |
Hardness (HB) | 269 max |

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