440c Stainless Steel Hot-Rolled And Cold Drawn Rod,
High-Performance Steel Rod, Heat Treatment Adjusts Its Properties
440c stainless steel introduction:
chemical composition: unit%
| Cr | C | Si | Mn | S | P |
| 16.00~18.00 | 0.95~1.20 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.035 |
| Ni | | | | | |
| ≤0.60 | | | |
The chemical composition of 440C mainly includes carbon (C),
chromium (Cr), nickel (Ni), molybdenum (Mo) and other elements.
Among them, the high carbon content makes 440C have high hardness
and wear resistance; the chromium content is between 17%-19%, which
provides good corrosion resistance for the steel; the addition of
nickel and molybdenum further improves the comprehensive
performance of the steel.
The physical properties of 440C include density, melting point,
thermal conductivity, etc. Its density is about 7.78 g/cm³, the
melting point is between 1398-1454℃, and the thermal conductivity
is low. These physical properties enable 440C to maintain good
stability in high temperature environments.
Heat treatment process
The heat treatment process of 440C mainly includes two steps:
quenching and tempering. Quenching is to heat the steel to above
the critical temperature and then cool it quickly to obtain
martensite structure. Tempering is to heat the steel to a certain
range below the critical temperature after quenching, keep it warm
for a period of time and then cool it to eliminate quenching stress
and improve the toughness of the steel.
Mechanical properties
The mechanical properties of 440C include tensile strength, yield
strength, elongation, cross-sectional shrinkage, etc. After proper
heat treatment, the tensile strength of 440C can reach more than
880 MPa, and the yield strength is also around 780 MPa. The
elongation and cross-sectional shrinkage are relatively low, but it
still has good plasticity and toughness.
Corrosion resistance
The corrosion resistance of 440C is mainly due to its high chromium
content. Chromium can form a dense oxide film, which effectively
prevents the corrosion of corrosive media on steel. In addition,
other alloying elements in 440C also help to improve its corrosion
resistance. In atmospheric environment, 440C has good rust
resistance; in corrosive media such as acid and alkali, it also
shows good corrosion resistance.
Application Areas
Due to its excellent corrosion resistance and hardness, 440C is
widely used in various occasions that require high corrosion
resistance and high hardness. The following are some typical
application areas:
1. Medical equipment: 440C is often used to manufacture medical
equipment such as scalpels, scissors, needles, etc., because of its
good corrosion resistance and sharpness.
2. Kitchenware: 440C can be used to make high-end kitchenware, such
as kitchen knives, frying pans, etc. Its wear resistance and
corrosion resistance make it an ideal kitchenware material.
3. Valves and pumps: 440C has good corrosion resistance and wear
resistance when manufacturing fluid control equipment such as
valves and pumps.
4. Bearings and gears: 440C can be used to manufacture transmission
parts such as bearings and gears. Its hardness and wear resistance
ensure the long-term stable operation of the equipment.
5. Aerospace: In the field of aerospace, 440C can be used to
manufacture certain high-temperature parts, such as turbine blades.
As a high-performance martensitic stainless steel, 440C has
excellent corrosion resistance and hardness. Its mechanical
properties can be further improved through reasonable heat
treatment process.
Delivery status:
If heat treatment is required, it will be delivered after heat
treatment.
If not required, it will be delivered without heat treatment.
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