![]() The straightness tolerance for mechanical and structural round tubing is 2mm/metre length. The concavity / convexity must not exceed 0.8% of the outside dimension H (Height) or B (Breadth), with a minimum of 0,5mm. Welded Steel Tube is a structural grade tube that is. ![]() the maximum twist in a 6.0m length may be 1mm + 6mm = 18mm. Mild Steel Rectangular Tube Structural (Welded) is a rectangular shaped tube of structural mild steel. The twist of a square or rectangular section must not exceed 2mm plus 0.5mm per metre length of tube i.e. The outside corner radius of each corner must not exceed 2.5 times the wall thickness. The angle at each corner of a tube must measure 90 o + 1 o. Another popular type of structural steel tube, that act like a middle-man between RHS and CHS, is the Square Hollow Section. the tolerance on wall thickness shall comply with that of the steel manufacturer and is typically as follows: Thickness in mm The wall thickness of the tubes shall be in the range of 1.2 - 6.0mm as required. Other lengths may be supplied on request, but are subject to minimum order quantities.ĭimensions - Mechanical and Structural Rounds Nominal diameter in mm Selected sizes in the structural tube range are available in 9.144 metre lengths. Structural and Mechanical tube is stocked in standard lengths of 6 metres, exceptions are:ġ93.7mm round in thicknesses of 3.5 and 6.0 mm where the stocked lengths are 6.1.Ģ19mm round in a thickness 3.5 mm where the stocked length is 6.1 metres.Ģ19mm round in thicknesses of 4.5 and 6.0mm where the stocked lengths are 6.1 and 9.144 metres. Furthermore it will assist Tubular steel in competing with other construction materials. Grade 355 Tube will enhance the benefits of Structural Hollow Sections and then will allow Tubes to compete on an equal footing with other steel sections. Engineers can now use an increase minimum yield stress of 355MPa yield and an Ultimate yield tensile stress of 450MPa for designs. Previously Grade 300 Tube, launched in June 1997, was available. Grade 355 Tubes, also commonly known as Structural Hollow Sections, was launched in February. Connecting members are typically joined by welding under strict factory conditions. In many instances, the higher strengths and qualities provided by. The lighter, yet stiffer structural members simplify the erection as longer spans can be pre-fabricated. compared to structural steel hollow sections supplied from Australian Tube Mills (ATM). The result is less material usage and a competitive engineering solution. Columns and beams do not need to be checked for torsional-flexural buckling if they fall within the limits of the slenderness ratio or when the height-to-breadth ratio of these sections does not exceed 2 to 1. ![]() When used as beams, the need for lateral support is reduced. High flexural stiffness in all directions is combined with high torsional stiffness. Dimensions and Section Properties of Rectangular HSS NOMENCLATURE Nominal width minus 3 times the design wall thickness, t (in.) Torsional shear constant of cross-section (in. Structural Hollow Sections (SHS) are very effective in resisting buckling loads, resulting in a high strength-to-mass ration. ![]()
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