304 stainless steel and 201 stainless steel are two common types of stainless steel, which have significant differences in chemical composition, physical properties, and applications.
1. * * Composition * *: The main components of 201 stainless steel include 15% chromium and 5% nickel, as well as manganese. 304 stainless steel is composed of 18% chromium and 8-9% nickel, with higher chromium and nickel content than 201 stainless steel.
2. * * Corrosion resistance * *: Due to the high chromium content in 304 stainless steel, its surface appears matte and has good corrosion resistance, making it less prone to rusting. 201 stainless steel, due to its high manganese content, has a shiny black surface and is prone to rusting.
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3. * * Mechanical properties * *: In terms of fatigue strength, 201 stainless steel has a higher hardness, but its toughness and fatigue resistance are not as good as 304 stainless steel.
4. Price: Due to the good quality of 304 stainless steel, its price is relatively high. Although 201 stainless steel is relatively cheap, its quality is slightly inferior.
5. * * Application Field: 201 stainless steel has certain acid and alkali resistance, high density, polishing without bubbles, no pinholes, and other characteristics. It is mainly used to produce various decorative tubes such as watch cases, strap covers, industrial tubes, and some shallow stretched products. 304 stainless steel is more commonly used in food grade and medical grade applications because it has better heat resistance and rust resistance.

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