SS420, also known as 420 stainless steel, is a martensitic stainless steel known for its high hardness, moderate corrosion resistance, and excellent polishability. It's commonly used in applications requiring wear resistance and sharp edges, such as cutlery, medical instruments, and some industrial components.
Key Properties and Characteristics:
Corrosion Resistance:
While not as corrosion-resistant as austenitic stainless steels, SS420 offers good corrosion resistance in hardened conditions, particularly against atmospheric conditions, food, fresh water, and mild alkalis and acids.
Weldability:
SS420 is not easily weldable due to its high carbon content, but it can be welded using filler rods of the same grade.
Applications:
Common applications include cutlery, surgical instruments, pump shafts, plastic molds, and parts requiring wear resistance and sharp edges.
Heat Treatment:
SS420 can be heat treated to enhance its hardness and mechanical properties. Annealing, hardening, and tempering are common heat treatment processes.
Composition:
SS420 contains 12-14% chromium and a higher carbon content (0.15-0.40%) compared to other stainless steel grades like SS410.
Hardness:
The higher carbon content allows SS420 to be hardened through heat treatment, achieving high levels of hardness.
In essence, SS420 is a versatile material favored for its balance of hardness, corrosion resistance, and polishability, making it suitable for a range of demanding applications.
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