Hot Rolled T Section Steel Split T Beam Q235B Q355B Grade 100-400mm Height for Steel Frame Building

A T-section steel member places the web on the centre line and leaves a flat face on top. That flat face is the reason it exists: where an H-beam would put steel on the wrong side of the fixing, a T-section sits flat against the plate, the deck or the rail. There are three ways to make one, and they are not interchangeable.

• Hot-rolled to GB/T 11263. The section comes off the mill with a clean surface and consistent thickness, in the TW (wide flange), TM (medium) and TN (narrow) series. Best fatigue behaviour because there is no weld and no cut edge, but it needs a mill order and the sizes are fixed by the standard.
• Split from an H-beam. One H-section is cut down the centre of the web and becomes two T-sections. This is the cheapest route for short runs and for sizes outside the standard series, and it inherits the flange and web thickness of the parent H-beam. The cut face is rougher than a rolled surface, and straightness depends on the saw and on how the parent beam was straightened.
• Welded built-up. A web plate is welded to a flange plate with full penetration. This is how heavy T-sections are made — crane rails, truss chords, machine frames — and how odd sizes are produced. It costs more in labour and needs weld inspection, but there is no upper size limit.

The choice is usually decided by quantity rather than preference. Under a few tonnes, splitting wins. Above that, a mill order or a welded assembly starts to make sense.

• Truss chords and web members — a single web is easier to gusset than an H-section, and the flat flange takes the node plate directly.
• Monorail beams and light crane rails — the bottom flange carries the trolley, the web takes the point load.
• Formwork walers and soldiers — the flat face bears on the panel without a packing piece.
• Machine frames and brackets — where a member has to bolt flat to a machined surface.
• Purlins and girts — where a flat fixing face matters more than weight.

Two dimensions do the work. The flange width controls local buckling and the spacing of the fixings; the web depth controls bending capacity. A split T inherits both from its parent H-beam, so the parent decides the result.

For the same mass, a T-section bends less efficiently about its strong axis than the H-section it came from, because the neutral axis has moved. What it buys is a flat face and a single web — which is worth more than the lost capacity when the member has to sit on something.

Start from the load and the span, then pick the series. If nothing in TW / TM / TN fits, a welded T is the next step, not a heavier split section.

Dimensional tolerance follows GB/T 11263, or EN 10034 where the project names a European standard. Three things matter more on a T than on an H:

• Squareness of the cut face on a split T — an out-of-square cut shows up as a gap when the flange is bolted down.
• Straightness and camber — a split T can inherit the parent's bow, and it doubles when the two halves are separated.
• Weld quality on a built-up T — full penetration, with ultrasonic testing where the member is fatigue-loaded.

Standard grades for T-section steel are Q235B and Q355B, with Q355C and Q355D for low-temperature service; S235JR and S355JR are the EN 10025 equivalents. Surface is either shot blasted to Sa2.5 and primed, or hot-dip galvanized where the member is exposed or the site is coastal.

Tell us which one at enquiry stage. Galvanizing a split T after cutting leaves the cut face coated, which is what you want; galvanizing before cutting leaves bare steel on the exposed edge.

Standard delivery is 6 m to 12 m, cut to length on request. Bundles are banded and packed for sea freight; lengths over 12 m ship as break-bulk or on a flat rack. We mark each bundle against the packing list so the site can unload without opening everything.

Send these and we return the section schedule, the weight and a quotation.