304 is a versatile stainless steel, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts.
304L is a low-carbon 304 iron chain variant of the occasion for the need for welding. Lower carbon content makes it close to the weld heat affected zone in the to minimize carbide precipitation, and carbide precipitation may result in some environments, stainless steel intergranular corrosion (weld erosion).
316 and 317 stainless steel with aluminum, which in the marine environment and the chemical industry point of corrosion resistance far superior to 304 stainless steel. Among them, 316 stainless steel by a variety of low-carbon stainless steel 316L, 316N nitrogen high-strength stainless steel and high sulfur content combined cutting stainless steel 316F.
904L (00Cr20Ni25Mo4.5Cu) is a low-carbon high-nickel, molybdenum austenitic stainless acid-resistant swing chain . Has a good active - passive transition ability, corrosion resistance, excellent non-oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid has good corrosion resistance, chloride ions in neutral medium with good anti-pitting resistance, but also has good resistance to crevice corrosion and stress corrosion resistance. Applicable to various concentrations of sulfuric acid below 70 ℃, atmospheric pressure and resistance at any concentration, any temperature and formic acid and acetic acid acetic acid mixed acid corrosion resistance is also very good.