According to composition, it can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni series (200 series), heat-resistant chromium alloy steel (500 series) and precipitation hardening series (600 series). 200 series: Chrome-manganese-nickel.304: general model; That's 18/8 stainless steel. Products such as:
corrosion - resistant containers, tableware, furniture, railings,
medical equipment. The standard composition is 18% chromium and 8%
nickel. It is a non-magnetic stainless steel which cannot be
changed by heat treatment method. GB brand is 06Cr19Ni10.
310: Excellent high temperature oxidation resistance, the highest
service temperature 1200℃.
316: After 304, the second most widely used steel, mainly used in the
food industry, watch jewelry, pharmaceutical industry and surgical
equipment, the addition of molybdenum to give it a special
corrosion resistant structure. It is also used as "Marine steel"
because of its better resistance to chloride corrosion than 304.
SS316 is usually used in nuclear fuel reprocessing units.
321: similar to 304 except that the addition of titanium reduces the
risk of weld corrosion.
Add stabilizer element niobium, suitable for welding aeronautical
appliance parts and chemical equipment.
400 series: Ferrite and martensitic stainless steel, manganese free, can
replace 304 stainless steel to a certain extent
410: Martensite (high strength chromium steel), good wear resistance,
poor corrosion resistance.
430: Ferritic stainless steel, for decorative purposes, e.g. automotive
accessories. Good formability, but poor temperature and corrosion
resistance.
440: High strength cutting tool steel, slightly higher carbon content,
after proper heat treatment can obtain high yield strength,
hardness can reach 58HRC, belongs to the hardest stainless steel.
The most common example is the "razor blade". There are three
commonly used models :440A, 440B, 440C, and 440F(easy to process).
