What type of stainless steel is SUS 420J2?

SUS 420J2 is a type of stainless steel that belongs to the martensitic stainless steel family. It is a low-end stainless steel with relatively low carbon content and high chromium content, which gives it good corrosion resistance, but also makes it less durable than higher-end stainless steel grades.

SUS 420J2 is often used in applications where high hardness and wear resistance are required, such as cutlery, surgical instruments, and industrial blades. However, it may not be suitable for high-stress applications or where the steel is exposed to harsh environments.

Chemical composition of SUS 420J2 stainless steel

The chemical composition of SUS 420J2 stainless steel is as follows:

Carbon (C): 0.26-0.40%
Silicon (Si): ≤1.00%
Manganese (Mn): ≤1.00%
Phosphorus (P): ≤0.040%
Sulfur (S): ≤0.030%
Chromium (Cr): 12.00-14.00%
Nickel (Ni): ≤0.60%
Note that the exact chemical composition may vary slightly depending on the manufacturer or supplier.

What are the mechanical properties of SUS 420J2 stainless steel?

The mechanical properties of SUS 420J2 stainless steel depend on various factors such as the heat treatment, tempering, and other processing conditions. However, below are some typical values:

Tensile strength: 655 MPa (95,000 psi)
Yield strength: 345 MPa (50,000 psi)
Elongation: 15%
Hardness: 50-55 HRC (Rockwell hardness scale)
Modulus of elasticity: 200 GPa (29,000 ksi)
It is important to note that these values are approximate and may vary depending on the specific conditions and testing methods used. Also, the mechanical properties of SUS 420J2 can be improved through appropriate heat treatment and processing techniques.

What are the physical properties of SUS 420J2 stainless steel?

Here are some typical physical properties of SUS 420J2 stainless steel:

Density: 7.75 g/cm³
Melting point: 1450-1510°C (2642-2750°F)
Thermal conductivity: 24.9 W/m*K at 100°C (212°F)
Specific heat capacity: 460 J/kg*K at 20°C (68°F)
Electrical resistivity: 0.60 µΩ*m at 20°C (68°F)
Magnetic properties: SUS 420J2 is a magnetic material due to its high content of iron and some chromium.
It is important to note that these physical properties are approximate and can vary depending on the specific conditions and testing methods used.

What are the advantages of SUS 420J2 stainless steel?

Some advantages of using SUS 420J2 stainless steel include:

Corrosion resistance: SUS 420J2 has good corrosion resistance due to its high chromium content, making it suitable for use in environments where corrosion is a concern.

Hardness and wear resistance: SUS 420J2 has a relatively high hardness and wear resistance, making it suitable for use in applications where these properties are important, such as cutlery, surgical instruments, and industrial blades.

Cost-effective: SUS 420J2 is a lower-end stainless steel, which makes it more cost-effective than some higher-end stainless steel grades.

Easy to machine: SUS 420J2 is relatively easy to machine and can be formed into various shapes and sizes.

Magnetic properties: The high iron content in SUS 420J2 makes it magnetic, which can be advantageous in some applications where magnetic properties are important.

Common Applications of SUS 420J2 Stainless Steel

SUS 420J2 stainless steel is commonly used in applications where high hardness, wear resistance, and corrosion resistance are important. Some common applications include manufacturing of surgical instruments, cutlery, industrial blades, and tools. It is also used in manufacturing of plastic molds, as well as in construction of parts for pumps, valves, and shafts. SUS 420J2’s magnetic properties make it suitable for some electrical and electronic applications, such as in manufacturing of components for sensors, relays, and switches.