... have superior material,advanced equipment ,and Test Report Provide Jiangsu Specifications2507 super duplex steel round bar steel grade:904L ... Section:Oval ,Elliptical ect. BrandShengyang Group (Shanghai ShengYang Steel Co.)GradeAISI304, 304L,316,316L,321,410,420 ect ... and anti-fatigue strength* Steady chemical composition, pure steel material and lower inclusion2 Advantages about us* Best quality and ...