Relatively different chemical composition
304 is a cap stainless steel, its material composition is OCr18Ni9, 304 stainless steel C ≤ 0.08 Ni8.00 ~ 10.00 Cr18.00 ~ 20.00, Mn <=2.0 Si<=1.0 S<=0.030 P<=0.035 316L is austenitic stainless steel, material composition is OOCr12Mo2Ti, 316 stainless steel C ≤ 0.08 Ni10.00 ~ 14.00 Cr16.00 ~ 18.00, Mo2.00 --- 3.00 Mn <=2.0 Si<=1.0 S<=0.030 P<=0.035 316L stainless steel C≤0.03 Ni10.00 ~ 14.00 Cr16.00 ~ 18.00, Mo2.00---3.00 Mn<=2.0 Si<=1.0 S<=0.030 P<=0.035 is a titanium-containing low-carbon stainless steel, alkali resistance and acid resistance (except for chlorine-containing media). 304 and 316, it is a big difference between the two! is 316 than 304 more than 2-3 nickel.
Second performance difference
304 steel can be resistant to sulfuric acid, phosphoric acid, formic acid, urea and other corrosion, suitable for general water, control gas, wine, milk, CIP cleaning fluid and other corrosive or non-contact material occasions. 316L steel on the basis of the increase in the molybdenum element in the 304 steel, which can significantly improve the resistance to corrosion of the intergranular corrosion, oxides, corrosion of the stress and reduce the ability to reduce the welding of hot cracking tendency. When the hot cracking tendency, it also has good resistance to chloride corrosion performance. Commonly used in pure water, distilled water, pharmaceuticals, sauce, vinegar and other health requirements of high corrosive medium strong occasions. Price 316L is 304 almost 2 times . Mechanical properties 304 is better than 316L, because 304, 316 corrosion resistance, heat resistance is outstanding, so as stainless steel is widely used, 304, 316 strength and hardness is similar. The difference between the two is that the corrosion resistance of 316 is much better than 304, and the more critical point is that 316 has added molybdenum metal, which has been enhanced in heat resistance.