Professional PFC Steel Weight Estimator 2026
Parallel Flange Channels, universally designated as PFC, represent essential structural steel sections featuring C-shaped profiles with parallel flanges providing uniform connection surfaces along the full length. Manufactured to BS 4 standards, these hot-rolled sections deliver excellent bending resistance perpendicular to the web, making them ideal for edge beams, lintels, roof purlins, and framework members throughout UK construction. Understanding PFC specifications, weight calculations, and application principles enables accurate material estimation and cost budgeting for structural steelwork projects.
The designation system identifies PFC sections by depth, flange width, and weight per metre, such as 230x90x32 indicating 230mm depth, 90mm flange width, and 32 kg per metre weight. Common sizes range from small 100x50mm sections weighing 10 kg/m to large 400x100mm sections exceeding 60 kg/m. The parallel flange configuration provides consistent connection geometry eliminating the tapered flanges found in older taper flange channels, simplifying bolted connections and improving structural efficiency.
Small PFC sections from 100x50mm to 150x75mm suit light structural applications including edge beams, light lintels, and secondary framework members. These sizes provide adequate bending capacity for modest spans and loading while maintaining economical material costs. The compact dimensions facilitate manual handling and straightforward site installation using standard lifting equipment and fixings.
Medium PFC ranging 180x75mm to 260x90mm serve general structural purposes including standard lintels, floor edge beams, purlins, and primary framework members in light industrial buildings. These sections balance strength capability with manageable weight and cost, suitable for typical building applications. Depths from 180mm to 260mm provide efficient section modulus for bending resistance, while flange widths of 75-90mm accommodate standard connection details.
Large PFC sections from 300x90mm to 400x100mm deliver substantial load-bearing capacity for heavy lintels, major edge beams, crane runway supports, and structural frameworks in industrial facilities. These sizes suit applications where significant bending moments demand robust sections with high section modulus. The increased depth maximizes bending efficiency, while wider flanges provide enhanced connection capacity and lateral stability.
The C-shaped profile concentrates material in the flanges providing maximum bending resistance for the section weight, with the web connecting flanges and resisting shear forces. Section modulus calculations determine bending capacity, with larger depths dramatically increasing efficiency. A 230mm deep PFC provides approximately 50% more bending capacity than a 180mm section despite only 25% additional weight, demonstrating the efficiency of increased depth.
Parallel flanges offer consistent connection geometry along the full member length, simplifying bolted connections and ensuring uniform bearing. This contrasts with older taper flange channels where varying flange width complicates connection design and reduces efficiency. The open section facilitates services installation within the channel depth, with cabling and pipework readily accommodated. Back-to-back channel arrangements create box sections for columns or beams, combining two PFC sections to achieve enhanced capacity and reduced slenderness ratios.
PFC weight derives from the cross-sectional area comprising two flanges and connecting web, multiplied by steel density of 7850 kg/m³. Manufacturers publish standard weights for catalogued sections, eliminating manual calculations for common sizes. Total project weight multiplies weight per metre by required length, then by quantity of sections needed. Wastage allowances of 5-10% account for cutting, fabrication, and end preparation requirements.
For verification or non-standard sections, approximate weight calculation uses formula: weight per metre equals web area plus two flange areas multiplied by steel density. Web area equals depth minus two flange thicknesses multiplied by web thickness. Flange area equals flange width multiplied by flange thickness. While complex for manual calculation, this method verifies published weights and enables custom section estimation when required.
PFC sections typically utilize S275 structural steel grade providing 275 MPa minimum yield strength, suitable for general construction applications balancing adequate strength with competitive pricing. S355 grade offers 355 MPa yield strength, enabling lighter sections for equivalent load capacity in weight-sensitive designs or long-span applications. Hot-rolled manufacturing produces as-rolled surface finish acceptable for most applications, with shot-blasted or galvanized finishes available for enhanced appearance or corrosion protection.
Good weldability allows fabrication using standard procedures without preheat requirements for typical thicknesses. Bolted connections suit site assembly and adjustable installations, particularly advantageous for edge beams and lintels requiring precise positioning. Welded connections provide rigid frameworks and permanent structures, with fillet welds along web and flanges distributing loads effectively. Corrosion resistance requires protective treatments including galvanizing for external applications or painting for internal steelwork.
PFC installation requires attention to orientation, typically positioning channels with the web vertical and flanges horizontal for bending applications. Lintels support masonry or blockwork with the top flange bearing the load, while the bottom flange remains exposed or concealed within finishes. Edge beams fix along slab edges providing support and load transfer, with the web oriented perpendicular to the slab. Purlins span between portal frames with flanges horizontal, resisting roof loads through bending about the strong axis.
Bolted connections through web or flanges accommodate various structural arrangements. Web connections using cleats or brackets transfer shear forces in beam-to-column connections. Flange connections provide moment-resisting joints or direct bearing arrangements. Connection design ensures adequate bolt numbers, spacing, and edge distances meeting BS 5950 or Eurocode 3 requirements. Welded connections employ fillet welds along web and flanges, with appropriate weld sizes calculated to transfer design forces without overstressing the parent material.
PFC steel prices typically range £1200-1500 per tonne for standard S275 grade in 2026, varying with global steel markets and order quantities. Fabrication costs of £400-700 per tonne cover cutting, drilling, and connection preparation. Galvanizing adds £200-300 per tonne providing long-term corrosion protection eliminating painting maintenance. Standard length availability from 6m to 12m influences waste and cutting requirements, with longer lengths reducing joints in continuous runs.
Comparing PFC against alternative section types considers bending efficiency, connection simplicity, and material costs. Universal beams provide superior bending capacity but cost 5-15% more per tonne and offer excess capacity for edge beam applications. Angles provide economical alternatives for light applications but lack bending efficiency for significant spans. The balance of strength, connection convenience, and cost makes PFC sections industry standard for lintels, edge beams, and secondary structural members throughout UK construction.
| PFC Size | Depth x Width | Weight (kg/m) | Typical Application |
|---|---|---|---|
| 100x50x10 | 100mm x 50mm | 10.20 | Light edge beams |
| 150x75x18 | 150mm x 75mm | 17.90 | Light lintels, purlins |
| 200x75x23 | 200mm x 75mm | 23.40 | Standard lintels |
| 200x90x30 | 200mm x 90mm | 29.70 | Heavy lintels, beams |
| 230x90x32 | 230mm x 90mm | 32.70 | Structural beams |
| 260x90x35 | 260mm x 90mm | 35.20 | Floor edge beams |
| 300x90x41 | 300mm x 90mm | 41.40 | Major structural members |
| 380x100x54 | 380mm x 100mm | 54.00 | Heavy industrial beams |
| Specification | Standard Value | Notes |
|---|---|---|
| Manufacturing Standard | BS 4 | Hot-rolled channels |
| Typical Steel Grades | S275, S355 | Structural quality |
| Steel Density | 7850 kg/m³ | Weight calculation |
| Standard Lengths | 6m, 9m, 12m | Stock availability |
| Flange Type | Parallel | Uniform width |
| Root Radius | 8-15mm | Web-flange junction |
| Price per Tonne | £1200-1500 | 2026 material pricing |
| Fabrication Cost | £400-700/tonne | Cutting, drilling |
Uniform flange width along full length simplifies connections and provides consistent bearing compared to older tapered channels.
Open section allows services installation within channel depth, with cabling and pipework readily accommodated for building services.
Material concentrated in flanges maximizes bending resistance. A 230x90x32 PFC provides excellent strength for typical lintel applications.
All UK PFC must meet BS 4 specifications ensuring dimensional accuracy, mechanical properties, and manufacturing quality control.
Web and flange connections accommodate various structural arrangements using bolts or welds for shear or moment transfer.
Two PFC sections combined create box sections for columns or beams, doubling capacity and improving buckling resistance.
A parallel flange channel is a structural steel section with C-shaped profile featuring flanges of uniform width along the full length, designated as PFC. The channel comprises two parallel flanges connected by a perpendicular web, manufactured to BS 4 standards. Typical sizes like 230x90x32 indicate 230mm depth, 90mm flange width, and 32 kg/m weight. Parallel flanges simplify connection design compared to older taper flange channels, providing consistent bearing surfaces. PFC sections suit lintels, edge beams, purlins, and framework members throughout UK structural applications.
PFC cost per metre depends on section size and weight. Small 150x75x18 PFC costs approximately £25-30 per metre, standard 230x90x32 PFC costs £42-52 per metre, and large 300x90x41 PFC reaches £54-68 per metre based on 2026 steel prices of £1200-1500 per tonne. Fabrication adds 30-50% to material costs for cutting, drilling, and connection preparation. Galvanized PFC costs 20-30% more than black steel but eliminates painting and maintenance expenses. Delivery charges and minimum order quantities affect total project costs.
Required PFC size depends on wall type, loading above, and bearing conditions. Typical cavity walls over 3 metre spans carrying floor loads require 230x90x32 PFC or 260x90x35 PFC depending on load magnitude. Single-storey applications with roof loads only may suit smaller 200x90x30 PFC. Structural engineer calculations must verify adequate capacity for specific loading conditions including masonry weight, floor or roof loads, and point loads. Building Regulations require structural calculations for all lintels ensuring compliance and safety. Never select lintel sizes without proper structural design.
PFC refers to Parallel Flange Channels with C-shaped open profiles and uniform flange width, while RSJ traditionally means Rolled Steel Joist referring to I-beam or H-beam sections. Modern RSJ typically describes Universal Beams with material concentrated in top and bottom flanges. PFC suits edge beams and lintels where the open section aligns with masonry or slab edges. RSJ provides superior bending capacity for floor and roof beams spanning between supports. Selection depends on structural requirements, with PFC offering connection advantages for edge applications.
Yes, PFC sections function effectively as beams particularly for edge beam applications along slab perimeters or supporting cladding. The open channel aligns with slab edges providing direct load transfer and convenient connection details. For internal beams spanning between columns, Universal Beams typically provide more efficient bending capacity. PFC beams require lateral restraint to prevent lateral-torsional buckling, achieved through connection to floors, walls, or discrete bracing members. Structural calculations verify adequacy considering bending, shear, deflection, and buckling requirements for specific applications.
Calculate PFC weight by multiplying published weight per metre by required length. For example, 230x90x32 PFC weighs 32.70 kg/m, so 6 metres weighs 196.2 kg. For multiple sections, multiply by quantity. Add 5-10% wastage for cutting and fabrication. Convert to tonnes by dividing by 1000. Published weights derive from cross-sectional area multiplied by steel density of 7850 kg/m³. Our calculator performs these calculations automatically including wastage factors and cost estimation based on per-tonne pricing.
Yes, PFC sections weld readily using standard MIG, TIG, or arc welding procedures. S275 and S355 grades offer excellent weldability without preheat requirements for typical thicknesses. Fillet welds along web and flanges provide effective load transfer in structural connections. For load-bearing applications, welding must meet BS EN 1090 standards using certified procedures and qualified welders. Proper joint preparation and welding parameters ensure full-strength connections. Post-weld inspection verifies quality, particularly critical for structural frameworks and primary load-bearing members in buildings and industrial structures.
Fire protection requirements depend on building classification, floor level, and structural design. Steel loses strength rapidly above 400-550°C, requiring protection to maintain load-bearing capacity during fire. Single-storey buildings may avoid protection through alternative design approaches. Multi-storey buildings typically require intumescent paint, board encasement, or spray protection achieving 30-120 minute fire ratings. External steelwork exempt from habitable building fire requirements may need only corrosion protection. Building Control and structural engineers specify exact fire protection requirements ensuring compliance with Building Regulations Approved Document B.
For PFC suppliers, visit Tata Steel | British Steel | For structural guidance, check Steel Construction Info