SUS420

SUS420 is a designation for a martensitic stainless steel commonly used in various industrial applications. It falls under the Japanese Industrial Standards (JIS) for stainless steels. This material is known for its good hardness, strength, and corrosion resistance, making it suitable for environments where wear and tear are concerns.

The composition of SUS420 typically includes a moderate amount of carbon, which contributes to its ability to be hardened through heat treatment. It also contains chromium, providing the characteristic corrosion resistance of stainless steels. The martensitic structure achieved after quenching and tempering allows SUS420 to attain high levels of hardness, often exceeding that of austenitic stainless steels.

Applications for SUS420 are diverse and include components requiring sharp edges or wear resistance, such as knives, surgical instruments, scissors, and certain types of tooling. Its ability to maintain a sharp edge and resist abrasion makes it a practical choice for these uses. Despite its hardness, SUS420 can be machined and fabricated, although the process may require specific considerations due to its strength. Proper heat treatment is crucial to achieving the desired mechanical properties and performance characteristics of SUS420.