The metal content of different materials in stainless steel welded pipes are different, and the application is very different.
The 316 and 317 stainless steel welded industrial tubes contain molybdenum (Mo), which is superior to the 304 stainless steel industrial welded pipe in the marine and chemical industry environments. Among them, 316 stainless steel extends from low carbon stainless steel 316L, nitrogen-containing high-strength 316 stainless steel thick-walled pipe and high-sulfur free-cutting stainless steel 316F. And 321 , 347 and 348 are titanium (Ti), niobium (Nb) and tantalum (Ta) respectively; as the yttrium-stabilized stainless steel, it is suitable for use as a welded member at a high temperature.
Corrosion resistance of various stainless steel welded pipes:
304 is a versatile stainless steel welded pipe that is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). 301 stainless steel exhibits significant work hardening during deformation and is used in a variety of applications requiring higher strength. 302 stainless steel is essentially a variant of 304 stainless steel with a higher carbon content, which allows it to achieve higher strength through cold rolling. The 316 stainless steel thick wall tube is a high silicon content stainless steel with high resistance to high temperature oxidation. 303 and 303Se are free-cutting stainless steels containing sulfur (Si) and selenium (Se), respectively, for applications requiring high cutting and high surface brightness. 316 stainless steel thick-walled tubes are also used to make parts that require enthusiasm because they have good hot workability under these conditions.
304L is a variant of the 304 stainless steel industrial welded pipe with a low carbon content for applications where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat affected zone near the weld, which may result in intergranular corrosion (weld erosion) in certain environments. 304N is a nitrogen-containing stainless steel with nitrogen (N) added to increase the strength of the steel. 305 and 384 stainless steels contain high nickel and have a low work hardening rate, making them suitable for a variety of applications where high cold formability is required. 308 stainless steel is used to make the electrode.
The nickel and chromium contents of 309, 310, 314 and 316 stainless steel welded pipes are relatively high in order to improve the oxidation resistance and creep strength of steel at high temperatures. The 30S5 and 310S are variants of the 309 and 310 stainless steels, except for the lower carbon content, in order to minimize the carbides precipitated near the weld. 316 stainless steel thick-walled tubes have exceptionally high resistance to carburization and thermal shock resistance.
Source: China Stainless Steel Welded Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)