Steel Suppliers in South Africa. Stewarts and Lloyds are leading suppliers of steel and structural tube products in South Africa. • Flat Bar • Joists • IPE Sections, IPE AA Sections • Universal Columns and Beams. Catalogues ... • Rectangular 25.4 x 12.7 x 1.6mm to 150 x 50 x 3mm • Also available in SABS 1431 300 WA. Other sizes ...