stainless steel pipe use for stair railing,windows guards,Door Thickness:0.3~3.0mm OD: ... Standard TIG welded From the nature, To the excellence. NameStainless Steel Railing StandardASTM A312, A249,A269 and A270,A554Material Grade201,202 ... )<105<100<90<90 Welding Line Polishing Line Bend: stainless steel Stair railing