Tata Structura RHS are welded structural tubes made by Tata Steel Tubes SBU conforming to IS 4923. The brochure lists section properties for each size and wall thickness presently rolled (40 combinations from 50x25 to 300x200 mm), with 200x100, 240x120, 300x150 and 300x200 mm marked as large diameter sections.

Key features

• Excellent distribution of material around the axis, giving high strength-to-weight ratio
• up to 30 % savings in steel
• Cost effective: high radius of gyration saves material, transportation and fabrication cost
• less surface area saves paint and labour cost
• Corrosion resistant: less exposed surface area and smooth uniform profile minimise dust and moisture accumulation
• Concentric strength: higher torsional rigidity, better lateral stability and lower wind drag
• weight reduction of up to 30 %
• Convenience of fabrication: lighter, smoother profile and minimal gusset plates
• Creativity: easier bending and aesthetic smooth profile, suitable for exposed environments
• Weldable with standard M.S. electrodes without pre-heating
• Marked with the TATA STRUCTURA emblem and the standard BIS mark

Applications

• Architectural: shopping malls, canopies/atrium, glass curtain wall frames, partition frames, space frames, guard rails and staircases
• Infrastructural: airport terminal buildings, bridges, bus stands, sign supporting structures, pedestrian walkovers (footbridges), sports galleries, railway platforms / foot over bridges
• Industrial: industrial sheds, trusses, columns and purlins, material storage racks, mine roof support systems (cogs, props), pallets, pipe racks, conveyor gantries and trestles, drilling rigs, steel and power plants
• General engineering: automobile chassis, greenhouse structures, truck and bus body members, hoarding structures, amusement park and playground equipment, exhibition stalls, scaffolding, furniture, solar power plant structures

Specifications

Steel Grade of Listed Properties: YST 310 | Minimum Yield Stress (YST 310): 310 MPa | Minimum UTS (YST 310): 450 MPa | Other Grades Manufactured: YST 210 and YST 240 are also manufactured; galvanized sections can also be manufactured | Allowable Stresses (YST 310): Axial tension 186 MPa; bending in tension or compression 205 MPa; shear 140 MPa; bearing 232 MPa; equivalent stress 279 MPa | Sulphur (Max): 0.05 % | Phosphorus (Max): 0.05 % | Surface Finish: Black without any surface treatment of oiling or varnishing | End Finish: Plain ended, mechanically sheared, mill-cut finish without further machining | Length: 6.0 m +/- 0.05 m; customised 6 m to 11 m | Straightness: Minimum 1:200 of any length (mill straightened) | Twist Tolerance: Maximum 2 mm +/- 0.05 mm/m length | Maximum Size: 300 x 200 mm | Thickness Range: 2 mm - 10 mm | Dimension Range Listed: 50 x 25 mm to 300 x 200 mm | Mechanical Properties (all grades, IS 4923): YST 210: YS 210 MPa, UTS 330 MPa, elongation 12 % (<25.4 mm) / 20 % (>25.4 mm); YST 240: 240 / 410 MPa, 10 % / 15 %; YST 310: 310 / 450 MPa, 8 % / 10 % | Dimensional Tolerance: Outside dimension +/-1 % with a minimum of +/-0.50 mm; thickness +/-10 %; squareness 90 deg +/-2 deg; corner radius 3t max; weight +10 % / -8 % individual lengths, +/-7.5 % on lot of 10 MT

Standards: IS 4923 | ISO 9000 (quality system) | BIS mark

Packing: Standard length 6.0 m +/- 0.05 m (customised lengths 6 m to 11 m may be supplied); bundles sealed with metal strap and labelled for size, measurement, lot number; approximate bundle weight 1.5 Mt (+/- 500 kg)