4 Inch Stainless Steel Pipe Fitting 1.Material:Austentic 2.Grade:304/304L,316/316L,etc. 3.Application:petroleum,Chemical,ect 4 Inch ... Black zp,ChromedSurfaceSurface: 2B, BA, 8K, HL, No.1, No.4, Golden 8K, Black 8K etc.ApplicationPetrochemical industry, chemical fertilizer ... to our company to give guidance for development. 4 Inch Stainless Steel Pipe Fitting 4 Inch Stainless Steel Pipe Fitting