Common types of 200 series stainless steel sheet Grade Application 301 High strength grade, with resistance to atmosphere corrosion.  Its bright, attractive surface make it an excellent choice for decorative structural applications. 304 Used for a wide variety of home and commercial applications. One of the most familiar & frequently used alloys in the stainless steel family. Common applications include Sanitary, Cryogenic, and Pressure-containing applications, Home and commercial appliances, Tank structural parts and processing equipment 309 Used for elevated temperature applications, including Furnace parts – conveyor belts, rollers, burner parts, refractory supports, retorts and oven linings, fans, tube hangers, baskets and trays to hold small parts; Containers for hot concentrated acids, ammonia and sulfur dioxide; contact with hot acetic and citric acid. 310/S Corrosion resistant, including furnace parts such as conveyor belts, rollers, burner parts, refractory supports, retorts and oven linings, fans, tube hangers, and baskets and trays to hold small parts. Chemical process industry to contain hot concentrated acids, ammonia, and sulfur dioxide and in the food processing industry, they are used in contact with hot acetic and citric acid 316 Used for elevated temperature applications, including handling hot organic and fatty acids, boat rails and hardware and facades of buildings near the ocean 321 A stabilized stainless steel which offers excellent resistance to corrosion following exposure to temperature between 800-1500 Deg F. Applications include Boiler and Pressure Vessels Chemical Composition Grade C Si Mn P≤ S≤ Cr Mo Ni Other 301 ≤0.15 ≤1.00 ≤2.00 0.045 0.03 16-18 - 6.0 - 304 ≤0.07 ≤1.00 ≤2.00 0.035 0.03 17-19 - 8.0 - 304L ≤0.075 ≤1.00 ≤2.00 0.045 0.03 17-19 - 8.0 309S ≤0.08 ≤1.00 ≤2.00 0.045 0.03 22-24 - 12.0 - 310 ≤0.08 ≤1.5 ≤2.00 0.045 0.03 24-26 - 19.0 - 316 ≤0.08 ≤1.00 ≤2.00 0.045 0.03 16-18.5 2 10.0 - 316L ≤0.03 ≤1.00 ≤2.00 0.045 0.03 16-18 2 10.0 - 321 ≤0.12 ≤1.00 ≤2.00 0.045 0.03 17-19 - 9.0 Ti≥5×C Mechanical Properties Grade YS(Mpa) ≥ TS (Mpa) ≥ El (%) ≥ Hardness(HV) ≤ 301 200 520 40 180 304 200 520 50 165-175 304L 175 480 50 180 309S 200 520 40 180 310 200 520 40 180 316 200 520 50 180 316L 200 480 50 180 321 200 520 40 180 Specification Grade 301,304,304l,321,316,316l,309s,310 Thickness Cold rolled:0.2-3.0mm Hot rolled:3.0-60mm Length As customer’s requirement Surface Finish 2B,2D,BA,NO4, Hair Line,6K, etc Manufacture Technology Cold rolled/ Hot rolled Material DDQ, High Copper, Half Copper or Low Copper Material Standard JIS, ASTM, AISI, GB, DIN, EN, etc we usually use ASTM and GB Standard Surface Treatment Name Feature Specification 2B Bright After cold rolling ,by heat treatment ,pickling or other equivalent treatment and lastly by cold rolling to given appropriate luster. BA Polishing ,mirror Processed with bright heat treatment after cold rolling Hairline Line like hair Hair grain grinding by appropriate particle size of material 6K/8K Mirror, brighter than BA Very bright, grinding and polishing surface by 1000# strop grain of abrasive belt Application Petroleum and chemical industry equipment,industrial tanks, war and electricity industries; Medical instruments,tableware,kitchen utensil,kitchen ware; Construction field, milk or food processing facilities, boiler heat exchanger; Architectural purposes, escalators, kitchen ware, vehicles, machinery and hardware fields. Petroleum and chemical industry equipment,industrial tanks, war and electricity industries; Medical instruments,tableware,kitchen utensil,kitchen ware; Construction field, milk or food processing facilities, boiler heat exchanger; Architectural purposes, escalators, kitchen ware, vehicles, machinery and hardware fields.