Galvanized steel pipes are divided into hot galvanizing and electro galvanizing. The hot galvanizing layer is thick, the cost of electro galvanizing is low, and the surface is not very smooth.
The chemical composition of 316 and 316L stainless steels is different. Corrosion resistance, heat resistance, strength and welding method are also different.
304 and 304L are two common stainless steel grades on the market.
201 and 202 stainless steels are two very common stainless steel materials, both of which belong to the 200 series stainless steel.