Stainless steel 302, 304, 316 is according to the stainless steel element content distinction.
1, 302: corrosion resistance with 304, because of the relatively high carbon content and therefore better strength.
2, 304: general type; that is, 18/8 stainless steel. Products such as: corrosion-resistant containers, cutlery, furniture, railings, medical equipment. The standard composition is 18 % chromium and 8 % nickel. For non-magnetic, can not be heat treatment methods to change the structure of the metallurgical organization of stainless steel. GB grade 0Cr18Ni9.
3, 316: after 304, the second most widely used steel, mainly used in the food industry, watches and ornaments, the pharmaceutical industry and surgical equipment, the addition of molybdenum to obtain a corrosion-resistant structure.
Expanded Information:
Stainless Steel Influence Factors:
1, Chromium Influence
Chromium is the most important alloying element in austenitic stainless steel, austenitic stainless steel stainless steel stainless steel stainless steel and corrosion resistance obtained mainly due to the role of the meeting quality, chromium promotes the passivation of the steel and keep the steel in a stable passivation state results. ○1 chromium effect on the organization: in austenitic stainless steel, chromium is a strong formation and stabilization of ferrite elements.
2, the influence of nickel
Nickel is a strong stabilizer of austenite and expand the austenite phase region of the element, in order to obtain a single austenitic organization, when the steel contains 0.1% carbon and 18% chromium when the minimum nickel content of about 8%, which is the most famous 18-8 chromium-nickel austenite stainless steel, the basic points.
3, molybdenum effect
Molybdenum and chromium are the formation and stabilization of ferrite and expand the ferrite phase area of the element, molybdenum formation of ferrite and chromium comparable ability. Molybdenum also promotes the precipitation of intermetallic phases in austenitic stainless steels, such as σ-phase, κ-phase, and Laves-phase, which can adversely affect the corrosion resistance and mechanical properties of the steel.
Baidu Encyclopedia-Stainless Steel