carbon steel welded neck flange: 1. Dimension: 1/2"to 72" 2. Material: Carbon steel, stainless steel, Alloy Steel carbon steel welded neck flange:1.Dimension:from 1/2" to 72"2.Thickness: STD, SCH20, SCH30, SCH40, SCH80, SCH100, SCH120, SCH160, XS, XXS3.Material: Carbon steel. Alloy Steel4.Standard: ANSI B16.5, DIN, JIS, GB5..Certificate: GB/T19001-2000-ISO9001:20006.Packaging: As per customers ...