What physical supply conditions are available for mild steel wire under this code?

Wires are supplied in Annealed (A), Half-hard (HB), or Hard drawn (H) conditions, depending on the required balance of strength and flexibility.

What is the maximum allowed carbon content for IS 280 mild steel wire?

Carbon content is restricted to a maximum of 0.25% to maintain its 'mild' characteristics and ensure ductility.

How is the ductility of the wire physically verified?

Through the Wrapping Test (conducted per IS 1755), where the wire must be wrapped around a mandrel of specified diameter without fracturing or breaking.

IS 280

: 2006

Mild Steel Wire for General Engineering Purposes - Specification

CurrentFrequently UsedSpecificationMaterials Science · Fencing, Gates and Barriers

Download PDF BIS Portal Google

This standard outlines the specifications for round mild steel wire used for general engineering purposes, including binding, fencing, and manufacturing wire products. It establishes limits for chemical composition, dimensional tolerances, and mandates mechanical performance evaluations like tensile and wrapping tests.

Specifies requirements for mild steel wire for general engineering applications, often used as base material for fencing wires.

Quick Reference Values

wire diameter range0.125 mm to 12.5 mm

max carbon content0.25%

max sulphur content0.050%

max phosphorus content0.050%

tensile strength annealed320 to 500 MPa

tensile strength half hard450 to 600 MPa

tensile strength hard drawnOver 550 MPa (varies by diameter)

Practical Notes

When procuring wire for rebar binding on construction sites, always specify the 'Annealed' condition to ensure high ductility and prevent the wire from snapping during twisting.

Verify wire diameter tolerances upon delivery using a micrometer; oversized wire reduces the running length per kilogram, affecting procurement quantities.

For outdoor use or corrosive environments, IS 280 applies to the base wire, but you must specify galvanized coating requirements per IS 4826.