Steel buyer guides

A steel reinforcing bar weighs d² ÷ 162.2 kg per metre, where d is the bar diameter in millimetres. A 12 mm bar weighs about 0.888 kg/m (10.8 kg per 40 ft bar) and a 16 mm bar about 1.578 kg/m (19.2 kg per 40 ft bar).

4 min read

Grade 60 rebar has a minimum yield strength of 420 MPa (60,000 psi), against 280 MPa (40,000 psi) for Grade 40, so it carries about 50% more stress before yielding. Always buy the grade written on the structural drawings and never substitute without the engineer's approval.

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A mill test certificate (MTC) is the steel mill's record of one heat of steel: its chemical composition and its tested mechanical properties against a named standard. Check that the heat number on the certificate matches the tag on your material and that every value meets the standard's minimum.

5 min read

An I-beam (IPE or UB) has flanges much narrower than its depth and is efficient in bending, so it is used for beams, joists and purlins. An H-beam (HEA, HEB or UC) has flanges about as wide as its depth, which makes it stiff about both axes and suited to columns and heavy frames.

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GI pipe is ordered by nominal bore in inches, which is not its real outside diameter: a ½-inch pipe is about 21.3 mm OD and a 2-inch pipe about 60.3 mm OD. In BS 1387 / EN 10255 medium class the wall thickness runs from 2.6 mm (½ and ¾ inch) to 5.0 mm (5 and 6 inch).

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For an accurate, comparable steel quote, send the supplier the standard and grade, every size with its quantity in tonnes or pieces, lengths, any cutting or bending, and the delivery location and access — and ask for mill test certificates with the material.

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Steel suppliers in Karachi fall into three groups: mills, importers and stockists (traders). For most site and workshop orders a stockist is the practical choice — compare them on the standard and grade quoted, mill test certificates, the weight basis of the price, cutting and bending, and delivery to your site.

5 min read

Pakistan's steel supply chain has three layers: mills that roll rebar and some sections from scrap and billets, importers that bring in structural sections, plate, coil and pipe through Karachi port, and stockists that sell mixed lots with processing and delivery. Buy by standard and grade, insist on a mill test certificate, and choose the layer that matches your quantity and timeline.

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