Quick answer: Galvanized iron (GI) is mild steel coated with zinc. The zinc stops rust, so GI is used for water pipes, outdoor sheets, fencing and ducting. Mild steel (MS) is uncoated, cheaper per ton and easier to weld, but must be…
Quick answer: MS square tube (SHS) weight (kg/m) = 4 × t × (a − t) × 0.00785, with side a and wall t in mm. Examples: 25 × 25 × 1.5 = 1.11 kg/m, 50 × 50 × 3 = 4.43 kg/m, 100 × 100 × 4 = 12.06 kg/m. Multiply by 6 for a 6 m length.
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