SUS 420J1 Stainless Steel: Typical Application Fields

SUS 420J1 stainless steel finds its niche across a diverse range of industries by offering an optimal balance of hardness, moderate corrosion resistance, and cost-effectiveness. Its properties, particularly after heat treatment, make it a superior choice over standard carbon steels and other stainless grades for applications where wear resistance and the ability to hold a sharp edge are paramount.
A primary and critical application field is the manufacture of cutlery and blades. From professional kitchen knives to industrial cutting tools, SUS 420J1 stainless steel capacity to be hardened to HRC 50 and above ensures long-lasting sharpness and durability. Similarly, the medical and surgical industry relies on this grade for a variety of instruments, including scalpels, forceps, and scissors, where its combination of bio-compatibility, sterilizability, and the ability to be precision-ground is essential.
Beyond cutting implements, SUS 420J1 stainless steel is extensively used in general mechanical engineering and automotive components. Its wear resistance makes it suitable for bearing races, pump shafts, valve parts, and spindle components subjected to moderate friction and load. In the molding industry, it serves as a cost-effective material for plastic molds that do not require the highest corrosion resistance of premium grades.
Furthermore, its utility extends to everyday items and hardware, such as high-quality fasteners, measuring tools, and components for the food processing industry where hygiene and resistance to moisture are required. This wide-ranging applicability underscores the material's versatility as a reliable and economical solution for demanding mechanical parts.