... ,SS321,SS310S and so on. Good Quality and Price The materials of our stainless steel pipes are SS200series,SS304,SS304L,SS316,SS316L,SS321 ... to 30 mm.Detailed Product Description...Good Quality and Low Price Stainless Steel Pipe 1)Grade: 304, 304L, 316, 316L, 321 2)Standards ... oil,medical treatment,chemical industry,food industry,light industry,machinery stainless steel welded pipe tube