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Stainless steel 440C is a high-carbon martensitic grade known for its exceptional hardness, wear resistance, and corrosion resistance. With a carbon content ranging from 0.95% to 1.20%, it achieves a high level of hardness through heat treatment, making it ideal for applications that require superior cutting performance, such as knife blades and surgical instruments. The chromium content of around 16-18% provides corrosion resistance, enabling its use in mildly corrosive environments. Stainless steel 440C is valued for its toughness, edge retention, and ability to maintain its properties at high temperatures. While it may not offer the same corrosion resistance as some other stainless steel grades, it excels in applications where hardness and wear resistance are paramount.

Product Properties

Chemical Properties

C:
.95-1.2
Cr:
16-18
Mn:
1
Mo:
0.75
P:
0.04
S:
0.03
Si:
1

Alloying Elements

Chromium: Most important element of stainless steel. An addition of 10% chromium will form an oxide film (passive surface film) which renders the steel corrosion resistant. Chromium also increases resistance to scaling.

Nickel: Second most important element. It increases ductility, corrosion resistance, scaling resistance, and high-temperature strength.

Silicon: Primarily increases resistance to scaling.

Manganese: Improves hot-working properties.

Molybdenum: Increases corrosion and high-temperature strength.

Sulfur-Phosphorus-Selenium: Increases machinability.

Titanium or Columbium-Tantalum: Stabilizes carbon and prevents chromium-carbide precipitation and subsequent intergranular corrosion.

Mechanical Properties

Mechanical properties for this product are not available at this time. Please contact your inside sales representative for further information.

Physical Properties

Density lb/In³:
0.28
Specific Heat, BTU/°F/Lb 32-212°F:
0.11
Thermal Condutivity, BTU/Ft2/Ft/HR/°F 212°F:
14
Coefficient of Thermal Expansion, Per °F x 10⁻⁸ 32-212°F:
5.6
Electrical Resistivity, Microhm-cm 70°F:
60

Fabrication Properties

Machinability ratings must be recognized as approximate values. They are a reasonable guide to relative tool life and power required for cutting. Variables of speed, cutting oil, feed, and depth of cut will significantly affect these ratios.

Machinability*:
40%
Approximate SFM:
65
% Relative Speed (Based on C1212 as 100%):
40
Drawing or Stamping:
Not Recommended
Welding:
Not recommended.

*Based on Bessemer Screw Stock No. B1112

Machinability ratings must be recognized as approximate values. They are a reasonable guide to relative tool life and power required for cutting. Variables of speed, cutting oil, feed, and depth of cut will significantly affect these ratios.

Disclaimer: The data listed here are recommended starting points. Higher speeds and feeds may be obtainable based on the working environment. Keep in mind that speeds and feeds should always be adjusted in small steps. When using carbide tools; surface speed can be increased 2 to 3 times over the suggested values; feeds can be increased between 50 and 100%.

Characteristics

A high carbon type. Can be heat treated for high strength and hardness. Greater abrasion and wear resistance for use in bearing and bushing applications. Corrosion resistant only in the hardened condition.

Typical Uses

Valve components, medical applications, ball bearings, molds and dies.


 

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