The term 'stainless steel plate' encompasses both stainless steel and acid-resistant steel plates. Emerging at the dawn of the 20th century, this material has been pivotal in propelling modern industry and technological advancements. Stainless steel plates come in various types with unique properties, evolving into several distinguished categories over time. Structurally, they fall into four main categories: austenitic, martensitic (including precipitation hardening), ferritic, and austenitic-ferritic duplex stainless steel plates. Chemically, they are classified based on key elements: chromium, chromium-nickel, chromium-nickel-molybdenum, low carbon, high molybdenum, and high purity stainless steel plates. Performance-wise, they are tailored for corrosion resistance, sulfuric acid resistance, pitting resistance, stress corrosion resistance, and high strength. Functionally, they cater to low temperature, non-magnetic, easy cutting, and super plastic applications. The common classification blends structural and chemical characteristics, grouping them into martensitic, ferritic, austenitic, duplex, and precipitation hardening types or chromium and nickel stainless steel categories. Typical applications include pulp and paper equipment, heat exchangers, mechanical and dyeing equipment, film washing apparatus, pipelines, and coastal construction materials.
According to the composition, it can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series), heat-resistant chromium alloy steel (500 series) and precipitation hardening series (600 series).
200 series: chromium-manganese-nickel
201,202, etc.: manganese replaces nickel, corrosion resistance is relatively poor, widely used as a cheap substitute for 300 series in China
300 series: chromium-nickel austenitic stainless steel
301: good ductility, used for molded products. It can also be hardened quickly by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel.
304: General model; that is, 18/8 stainless steel. Products such as: corrosion-resistant containers, tableware, furniture, railings, medical equipment. The standard composition is 18% chromium plus 8% nickel. It is a non-magnetic stainless steel whose metallographic structure cannot be changed by heat treatment. The GB grade is 06Cr19Ni10.
316 L: Low carbon, more corrosion resistant, easy to heat treat, products such as: chemical processing equipment, nuclear power generators, refrigerant storage tanks.
321: Except for the addition of titanium to reduce the risk of material weld corrosion, other properties are similar to 304.
400 series: ferritic and martensitic stainless steel, manganese-free, can replace 304 stainless steel to a certain extent
430: ferritic stainless steel, decorative, such as for automotive accessories. Good formability, but poor temperature resistance and corrosion resistance.

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