The S355 mechanical structure tube is a high-strength, low-alloy steel that is commonly used in structural and mechanical engineering applications. Known for its excellent balance between strength, toughness, and weldability, S355 tubes are ideal for the construction of large structures, particularly where high load-bearing capacity and durability are critical. This steel grade is manufactured to European standards, specifically to EN 10210 and EN 10219, which specify the dimensions, tolerances, and mechanical properties of tubes made from this steel.