Precipitation hardening stainless steel. It has good formability and good weldability, and can be used as an ultra-high-strength material in the nuclear industry, aviation and aerospace industries.
According to the composition, it can be divided into Cr series (SUS400), Cr-Ni series (SUS300), Cr-Mn-Ni (SUS200) and precipitation hardening series (SUS600).
200 series-chromium-nickel-manganese austenitic stainless steel
300 Series - Chromium-Nickel Austenitic Stainless Steel
301 - Good ductility, used for forming products, and can also be hardened by machine speed, good weldability, better wear resistance and fatigue strength 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-By adding a small amount of sulfur and phosphorus to make it more machining.
304 - i.e. 18/8 stainless steel. GB grade is 0Cr18Ni9.
309 has better temperature resistance than 304.
316 is the second most widely used steel after 304, mainly used in the food industry and surgical equipment, adding molybdenum to obtain a special structure that is resistant to corrosion. Because of its better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is typically used in nuclear fuel recovery units. Grade 18/10 stainless steels generally also meet this application level.
Model 321 - Similar to 304 except that the risk of corrosion in material welds is reduced due to the addition of titanium.
400 Series - Ferritic and Martensitic Stainless Steels.
408 - Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409 - The cheapest model (UK and US), commonly used as a car exhaust pipe, is a ferritic stainless steel (chromium steel).
410 - Martensitic (high strength chromium steel), good wear resistance, 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. Also used in surgical knives, 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.
630 - The most commonly used type of precipitation hardening stainless steel, usually also called 17-4; 17% Cr, 4% N.
