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What are 304 and 316?

What are 304 and 316?

2021-06-05

what are 304 and 316?

Both 304 and 316 are Austenitic stainless steel, the difference is that 316 has 2% molybdenum added. In this way, the corrosion resistance of 316, especially the corrosion resistance of chloride ions, is better than that of 304. The price is about 20% more expensive.304, 316, etc. are the names of American steel grades.

 

304 corresponds to the domestic grade 0Cr18Ni9. It is  universal stainless steel and the most commonly used stainless steel. It is widely used to make equipment and parts that require good comprehensive performance (corrosion resistance and formability), such as food equipment, general chemical industry Equipment, etc. 304 have an excellent cold and hot processing and molding properties. It can process and produce various products such as plates, tubes, wires, belts, and shapes, and is suitable for manufacturing cold heading, deep drawing, and deep drawing forming parts. The weldability is general, and the usual welding method can be used. No heat treatment is required before and after welding. However, 304 steel also has performance shortcomings: large cross-section steel parts are sensitive to intergranular corrosion after welding; very sensitive to stress corrosion in CL-water (including wet atmosphere); mechanical strength is low, and cutting performance is poor Wait.   

 The 304F represents the sulfur content, which is about twice higher than that of 304, about 0.1. It is better processed in terms of processing. Secondly, the anti-rust performance is slightly lacking compared with 304!

 

304L corresponds to the domestic brand 00Cr18Ni11, which is a variant of 304 stainless steel with lower carbon content and is used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause stainless steel to produce intergranular corrosion (welding erosion) in certain environments.

 

316 corresponds to the domestic grade 0Cr17Ni12Mo2. It is low-carbon stainless steel. Its welding performance is better than that of 304. Because stainless steel contains molybdenum, its pitting corrosion resistance in marine and chemical industrial environments is much better than that of 304 stainless steel. Under high-temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good chloride corrosion properties. Among them, the 316 stainless steel variants include low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, and free-cutting stainless steel 316F with a higher amount of sulfur.

316L is an ultra-low carbon stainless steel with a maximum carbon content of 0.03. It can be used in applications that cannot be annealed after welding and require maximum corrosion resistance. Its corrosion resistance is better than 304 stainless steel, and it has good resistance in the production process of pulp and paper. Corrosion performance.

316 and 316L have better heat resistance and can be used as heat-resistant steel, but 304 cannot. In intermittent use below 1600 degrees and continuous use below 1700 degrees, 316 stainless steel has good oxidation resistance.it is best not to work continuously  In the range of 800-1575 degrees, but when 316 stainless steel is used continuously outside this temperature range, the stainless steel has good heat resistance. 316L stainless steel has better resistance to carbide precipitation than 316 stainless steel, and the above-mentioned temperature range can be used.

 


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