Type
301- Ductility is good, used for molding products. It can also be hardened quickly by machining. Weldability is good. Wear resistance and fatigue strength superior to 304 stainless steel.
Type
302-Corrosion resistance is the same as 304, with better strength due to relatively higher carbon content.
Type
303-The addition of a small amount of sulfur and phosphorus makes it easier to cut than 304.
Type
304-Generic type; i.e., 18/8 stainless steel; GB grade 0Cr18Ni9.
Type
309-Better temperature resistance than 304.
Type
316-After 304, the second most widely used steel, mainly used in the food industry and surgical equipment, the addition of molybdenum to obtain a corrosion-resistant special structure. The addition of molybdenum gives it a special structure that resists corrosion. It is also used as a "marine steel" because of its better resistance to chloride corrosion than 304, and SS316 is commonly used in nuclear fuel recovery units. 18/10 grade stainless steel is usually compatible with this application level. [1]
Type
321 - Similar properties to 304 except that the addition of titanium reduces the risk of corrosion in the weld seams of the material.
400
Series - Ferritic and martensitic stainless steels
Type
408 - Good heat resistance, weakly corrosion resistant, 11% Cr, 8% Ni, good corrosion resistance, good corrosion resistance.
Type
409-The cheapest type (Anglo-American), usually used as automobile exhaust pipes, a ferritic stainless steel (chromium steel).
Type
410-Martensitic (high-strength chromium steel), good abrasion resistance, poor corrosion resistance.
Type
416-Added sulfur improves the machinability of the material.
Type
420-"Sharpening grade" martensitic steel, similar to Brinell high-chromium steel, one of the earliest stainless steels. Also used for surgical knives and can be made very bright.
Type
430-Ferrite stainless steel, decorative, e.g., for automotive jewelry. Good moldability, but temperature resistance and corrosion resistance are inferior.
Type
440-High-strength sharpening steel, slightly higher carbon content, after appropriate heat treatment can obtain high yield strength, hardness can reach 58HRC, belong to the hardest stainless steel. The most common application example is "razor blade". There are three common types: 440A, 440B, 440C, and 440F (easy-to-machine type).
500
Series - Heat-resistant chrome alloy steel.
600
Series-Martensitic precipitation hardening stainless steel.
Type
630-The most commonly used precipitation-hardening stainless steel type, often also called 17-4; 17% Cr, 4% Ni. and chromium 18-20.
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