304 stainless steel: 304 stainless steel is a universal steel. As a universal steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; it has good hot workability such as stamping and bending, and no heat treatment hardening. (Non-magnetic, use temperature -196℃~800℃).

　　316 stainless steel: 18cr-12ni-2.5Mo contains molybdenum (Mo) that 304 does not have. 316 has better corrosion resistance than 304. Molybdenum can further improve the atmospheric corrosion resistance, especially the corrosion resistance of chloride-containing atmosphere. It is the second steel grade commonly used after 304. The main characteristic is that the ability to resist acid and alkali and high temperature is stronger than that of 304. Another significant feature of 316 stainless steel is that there is no phenomenon of thermal expansion and contraction.

The main components of 304 stainless steel and 316 stainless steel are about 16-18% chromium, but 304 stainless steel uniformly contains 9% nickel, and 316 stainless steel uniformly contains nickel 12%. Nickel can improve high-temperature durability and improve mechanical properties in metal materials. Improve antioxidant properties. Therefore, the nickel content of the material directly affects the comprehensive performance of the material.

　　304 (0Cr18Ni9) stainless steel is austenitic stainless steel, which cannot be strengthened by heat treatment, cannot be quenched like carbon steel, and has no magnetism. 304 has comparable mechanical properties, has considerable corrosion resistance and high temperature resistance, and is widely used as a stainless heat-resistant steel. 316 (0Cr17Ni12Mo2) contains molybdenum (Mo) that 304 does not have. 316 has better corrosion resistance than 304. Molybdenum can further improve the atmospheric corrosion, especially the corrosion resistance of chloride-containing atmosphere.