According to the composition, it can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series) and precipitation hardening system (600 series).
200 Series – Chromium-Nickel-Manganese, Austenitic Stainless Steel.
300 Series – Chromium-Nickel, Austenitic Stainless Steel.
301 – Good ductility, used for molded products. It can also be hardened by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel.
302-corrosion resistance is the same as 304 because the carbon content is relatively high and the strength is better.
303-It is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
304 – i.e. 18/8 stainless steel. GB grade is 0Cr18Ni9.
309-It has better temperature resistance than 304.
316 – After 304, the second most widely used steel grade, mainly used in food, industry, pharmaceutical industry, and surgical equipment, adding molybdenum to obtain a special structure that is resistant to corrosion. It is also used as “marine steel” because of its better resistance to oxide corrosion than 304. SS316 is usually used in nuclear fuel recovery units. Grade 18/10 stainless steel generally also meet this application level. Stainless Steel Bucket Model 321 – Similar to 304 except that the addition of titanium reduces the risk of corrosion of the material’s welds.
400-Series – Ferritic and Martensitic Stainless Steels.
408 – Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409 – The cheapest model (British and American), usually used as a car exhaust pipe, is a ferritic
Stainless steel (chrome steel).
410 – Martensitic (high strength chromium steel), good wear resistance, and poor corrosion resistance.
416 – The addition of sulfur improves the processing properties of the material.
420 – “cutting grade” martensitic steel, the earliest stainless steel similar to Brinell high chromium steel.
Used for surgical tools, can do very bright.
430 – Ferritic stainless steel, for decorative purposes, such as for car accessories. Good formability, but poor temperature and corrosion resistance.
440-high-strength cutting tool steel, with slightly higher carbon content, can obtain higher yield strength after proper heat treatment, and the hardness can reach 58HRC, which is one of the hardest stainless steels. The most common application example is “razor blades”. There are three commonly used models: 440A, 440B, 440C, and 440F (easy processing type).
500 Series – Heat Resistant Chromium Alloy Steel.
600 Series – Martensitic Precipitation Hardening Stainless Steel.
Stainless Steel 630 – The most commonly used type of precipitation hardening stainless steel, also commonly called 17-4; 17%Cr, 4%Ni.
3 series stainless steel is austenitic stainless steel, ferritic stainless steel is 4 series, 430 is one of the most representative steel types, you call stainless iron.
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