stainless steel pipe welding fitting standard:astm material:304,304L,304H,321,321H,316,316L,317L,310S,347H stainless steel pipe welding fitting(reducing tee)standard:astmmaterial:304,304L,304H,321,321H,316,316L,317L,310S,347HO.D.:6-530MMW.T.:0.6-30MMspecification as customer request