Alloy Steel Elbow: Item: Alloy steel butt welded 90 l/r elbow Size: 1/2inch to 24inch is seamless, 26inch to 48inch is welded or seam. Material: Carbon steel, ASTM WPB A335 WP5 ect. Standard: ANSI B16.9, DIN2605/2615/2616/2609, JIS B2311, EN10253-1 ect.