Stainless steel plate is generally the general term for stainless steel plate and acid-resistant steel plate. The surface is smooth, has high plasticity, toughness and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions and other media. It is an alloy steel that is not easy to rust, but it is not absolutely rust-free. Stainless steel plate refers to steel plate that is resistant to corrosion by weak media such as atmosphere, steam, water, etc., while acid-resistant steel plate refers to acid, alkali, and salt resistance. There are many types of stainless steel plates with different properties. They are generally divided into martensitic stainless steel plates, ferritic stainless steel plates, austenitic stainless steel plates, duplex stainless steel plates and precipitation hardened stainless steel plates.

Stainless steel plates are divided into four categories according to their organizational structures: austenitic stainless steel plates, martensitic stainless steel plates (including precipitation hardened stainless steel plates), ferritic stainless steel plates, and austenite plus ferrite duplex stainless steel plates.

Stainless steel plates are classified according to the main chemical components in the steel plates or some characteristic elements in the steel plates, and are divided into chromium stainless steel plates, chromium-nickel stainless steel plates, chromium-nickel-molybdenum stainless steel plates, low-carbon stainless steel plates, high-molybdenum stainless steel plates, and high-purity stainless steel plates. wait.

Surface Features & Manufacturing Methods & Applications of Stainless Steel Sheets

International labeling method for stainless steel plate

The American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel. in:

① Austenitic stainless steel is marked with numbers of 200 and 300 series. For example, some of the more common austenitic stainless steels are designated 201, 304, 316, and 310.

②Ferritic and martensitic stainless steels are represented by numbers in the 400 series. Ferritic stainless steels are marked with 430 and 446, and martensitic stainless steels are marked with 410, 420 and 440C.

③ Duplex (austenitic-ferritic) stainless steel, precipitation hardening stainless steel and high alloys with iron content less than 50% are usually named by patent names or trademarks.

300-600 type stainless steel brief description:

300 Series—Austenitic Stainless Steel

Model 301—Good ductility, used for forming products. It can also be hardened by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel.

Model 302—The corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content.

Model 303—By adding a small amount of sulfur and phosphorus, it is easier to cut than 304.

Model 304—General model; ie 18/8 stainless steel. The GB grade is 0Cr18Ni9.

Model 309—better temperature resistance than 304.

Type 316—after 304, the second most widely used steel grade, mainly used in the food industry and surgical equipment, adding molybdenum to obtain a special corrosion-resistant structure. Because it has better resistance to chloride corrosion than 304, it is also used as "marine steel". SUS316 is usually used in nuclear fuel recovery devices. Grade 18/10 stainless steel is also generally suitable for this application level.

Model 321—Similar to 304 except that the risk of material weld corrosion is reduced due to the addition of titanium.

400 Series—Ferritic and Martensitic Stainless Steels

Model 408—good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.

Model 409—The cheapest model (British and American), usually used for automobile exhaust pipes, is a ferritic stainless steel (chrome steel).

Model 410—martensitic (high-strength chromium steel), good wear resistance, poor corrosion resistance.

Type 416—addition of sulfur improves the machinability of the material.

Type 420—"Knives Grade" Martensitic Steel, the original stainless steel similar to Brinell High Chromium. It is also used for surgical knives and can be made very shiny.

Type 430—Ferritic stainless steel, decorative, eg for automotive trim. Good formability, but poor temperature resistance and corrosion resistance.

Model 440—high-strength cutting tool steel with slightly higher carbon content, higher yield strength can be obtained after proper heat treatment, and the hardness can reach 58HRC, which belongs to the hardest stainless steel. The most common application example is "razor blades". There are three commonly used models: 440A, 440B, 440C, and 440F (easy to process).

500 Series—Heat Resistant Chromium Alloy Steel

600 Series—Martensitic precipitation-hardening stainless steels.

Type 630—the most commonly used type of precipitation hardening stainless steel, also commonly called 17-4; 17%Cr, 4%Ni.