Classification of stainless steel rods

According to the composition, it can be divided into Cr series (SUS400), Cr-Ni series (SUS300), Cr-Mn-Ni (SUS200) and precipitation hardening system (SUS600).
200 Series-Chromium-Nickel-Manganese Austenitic Stainless Steel
300 Series-Chromium-Nickel Austenitic Stainless Steels
301-Good ductility, used for molding products. It can also be hardened by machine speed. Good weldability. The wear resistance and fatigue strength are better than those of 304 stainless steel.
302-The corrosion resistance is the same as 304, and the strength is better because the carbon content is relatively high.
303-by adding a small amount of sulfur and phosphorus to make it sharpened.
304- i.e. 18/8 stainless steel. The GB grade is 06Cr19Ni10.
309-Better temperature resistance than 304.
316-After 304, the second most widely used steel grade, mainly used in the food industry and surgical equipment, the addition of molybdenum element to obtain a special structure that resists corrosion. Because it has better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is commonly used in nuclear fuel recovery units. Grade 18/10 stainless steel is also generally suitable for this application class. [1]
Model 321-Similar to 304, except that the addition of titanium reduces the risk of corrosion in the weld seam of the material.
Series 400-Ferritic and martensitic stainless steels
408-Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409 – the cheapest model (Anglo-American), commonly used as a car exhaust pipe, is ferritic stainless steel (chromium steel).
410-martensitic (high-strength chromium steel), good wear resistance, poor corrosion resistance.
416-Sulfur is added to improve the processability of the material.
420-"Cutting tool grade" martensitic steel, similar to Brinell high-chromium steel, the earliest stainless steel. It is also used for surgical knives and can be made very bright.
430 – ferritic stainless steel, decorative, e.g. for automotive accessories. Good formability, but poor temperature resistance and corrosion resistance.
440-high-strength cutting tool steel, slightly higher carbon content, after proper heat treatment can obtain a high yield strength, hardness can reach 58HRC, belongs to the hardest stainless steel. The most common example of an application is a "razor blade". There are three commonly used models: 440A, 440B, 440C, and 440F (easy to process).
500 Series-Heat-resistant chromium alloy steels.
600 Series-Martensitic precipitation hardened stainless steel.
630-the most commonly used precipitation hardening stainless steel model, usually also called 17-4; 17%Cr,4%Ni.