Description SMT Santrade keeps a large assortment of Welded and Seamless Tubes and Pipes on stock: Seamless ANSI: ½" to 12" with sch10s to sch160s Welded ANSI: ½" to 24" with sch5s to sch40s Welded ISO /DIN: DN10 to DN600 Grades Standard grades 304/304L, 316/316L, 1.4541, 1.4571