316 luj stainless steel: in using state organization mainly in ferrite stainless steel. Chromium content in 11% ~ 30%, with a body centered cubic crystal structure. Such steel generally do not contain nickel, sometimes also contains a small amount of Mo, Ti, Nb elements, this class of steel with large thermal conductivity, small expansion coefficient, good oxidation resistance, good resistance to stress corrosion, etc, used in the manufacture of more air, steam, water and oxidation resistance of acid corrosion parts. This kind of steel are low plasticity, plastic deformation after welding, and corrosion resistance decrease and so on shortcomings, thus limits its application. (AOD and VOD refining outside the furnace technology) application can make the gap element such as carbon, nitrogen is reduced greatly, so make this kind of steel is widely used.