416 Stainless Steel
Type 416 Stainless Steel is a stainless steel which is martensitic and can be hardened by heat treatment to higher strength and hardness levels. It has much better machining properties than the austenitic grades, but lower corrosion resistance. In dry conditions and in environments that are mildly corrosive, 416 machining grade is practically comparable with unmodified types. Type 416 is somewhat inferior in corrosion resistance to other 12% chromium stainless steels, such as type 410. Type 416 Stainless Steel may also be heat treated to varying degrees of strength and hardness by appropriate treatment. It may be used in welding, with some difficulty, and it must be annealed after welding at about 1450° F to improve its ductility and corrosion resistance.