Carbon Steel S275JR Round Bar

Carbon Steel S275JR Round Bar is a hot-rolled non-alloy structural steel bar produced to EN 10025-2, the European standard for technical delivery conditions for non-alloy structural steels, carrying Werkstoff number 1.0044. The designation sets a minimum yield strength of 275 MPa for thicknesses or diameters up to 16 mm, together with quality class JR, requiring a Charpy V-notch impact energy of 27 J at plus 20 degC.

The material is supplied in the as-rolled or normalised rolled condition depending on grade and producer practice. It is not heat treated for strength. Strength comes from a combination of carbon and manganese content and controlled rolling, which keeps the carbon equivalent low and preserves weldability.

Chemistry is controlled with carbon at 0.24% maximum, manganese at 1.50% maximum, phosphorus at 0.04% maximum and sulphur at 0.04% maximum for the bar sizes normally supplied. With the carbon equivalent capped at 0.4, shielded metal arc, gas metal arc, flux cored and submerged arc welding all work with standard low-hydrogen consumables and normal preheat practice.

Round bars are commonly available from about 8 mm to 250 mm diameter, with dimensional tolerances to EN 10060. Standard random lengths are 6 metres and cut-to-length supply is widely offered. Surface condition is normally hot rolled or hot rolled and descaled, with turned and peeled bar available where a cleaner surface is needed.

Typical applications include structural frameworks, columns, bracing, anchor bolts and tie rods, bridge and crane components, machinery bases and frames, transmission towers, offshore and marine structures, earthmoving and lifting equipment, and general welded fabrication. Industries served include construction and infrastructure, heavy engineering, shipbuilding, offshore oil and gas, mining equipment and material handling.