Welded Steel Tubes 1.Standard:ASTM,ANSI,API,GB,DIN, ... Thickness:0.35mm-2.5mm 4.Material:Q195,Q235 welded Steel Tubes1) Available shapes: round, square, rectangular, bread ... shaped 2) Thickness: 0.4 - 3.0mm3) Steel grade: SPHC, 08AL, 08F, HG5, DF08, Q195-235, M84 ... can produce precision and high-frequency welded steel tubes and pipes with all possible dimensions and shapes available.