The role of the composition of various stainless steel metal elements

The decision function: 1 in stainless steel, chrome to determine gender of stainless steel is only one element, and this is chrome, each stainless steel containing a certain amount of chromium. To date, there has been no do not contain chromium stainless steel. Chromium is decided the main elements of the stainless steel performance, the fundamental reason is that after adding chromium alloy elements into the steel, make its internal contradiction movement to the aspects of development in the resistance to corrosion damage. 2 carbon in duality of stainless steel carbon steel is used in industry, one of the main elements of the performance of the steel and organization to a large extent depends on the content and distribution of carbon in steel form, the influence of the carbon in the stainless steel is particularly significant. Carbon impact to the organization in the stainless steel is mainly manifested in two aspects, on the one hand, carbon austenitic elements are stable, and the role of a large ( About 30 times of nickel) , on the other hand, due to the affinity of carbon and chromium is very big, and chromium form - Series of complex carbide. So, from both a strength and corrosion performance of candle, the role of carbon in stainless steel is contradictory. 3 nickel and nickel in the stainless steel is played out only after cooperate with chromium nickel is excellent corrosion resistant material, but also an important alloying elements of alloy steel. Nickel is the formation of austenite in the steel element, but the low-carbon nickel steel to obtain pure austenitic organization, nickel content reaches 24%; And only make 27% nickel steel in some medium corrosion resistance change significantly. So the nickel can't constitute a stainless steel. But nickel and chromium also exists in stainless steel, nickel stainless steel has many valuable properties. Nickel is diamagnetic elements, the stainless steel not attracted by magnet. 4 titanium and titanium niobium and niobium in the stainless steel is to prevent intergranular corrosion. 5 molybdenum and copper molybdenum and copper can improve the corrosion resistance of stainless steel.