Characteristics 201 modification：Low-Ni Austenite steel type. 202 modification：Low-Ni Austenite, its corrosion resistance is between 304 and 201 modification. 304：General-purpose steel grade because of its good corrosion resistance, thermal resistance and            trength at slow-temperature. Excellent formability and excellent weldability, as well 304L：It is a type of low-carbon 304 steel that has similar corrosion resistance with 304 steel in normal              condition and more excellent weldability. 316：With the addition of Mo in 304, 316 steel is superior in corrosion resistance compared to 304 grade,            pitting resistance and high temperature strength. 316L：Low carbon 316 steel type. It has all the properties of 316 steel and has excellent inter-granular              corrosion resistance   Usages 201 modification：A substitute for 304 in some application with lower                                corrosion resistance 202 modification：A substitute for 304 in some application with lower                                corrosion resistance 304：Most Widely used steel grade Household utensils (sink, interior pipe, hot-water system,       bathtub, boiler and others) Automotive components(wiper, muffler, molding) Medical instruments   Building materials Some industries (chemical, food processing, textile) and vessel       parts 304L：   Machinery and tools used in chemical, coal and petroleum       industriesthat require high inter-granular corrosion resistance   Building material, heat resistant parts and parts that is difficult       to implement heat treatment 316：   Potable water pipe   Materials for use in seawater   Equipment for manufacturing chemicals, paper, dye, acetic and       fertilizer   Structures in the coastal area   Photo industries, and food processing industries 316L：Suitable for the corrosion-susceptible environments such as salt and toxic gas which one of the 316              steel usages