Castellated beams: design, welding and purchasing checks

Castellated beams are made by cutting a parent beam's web and rewelding the halves at greater depth. Openings allow services to pass and alter bending properties. Evaluate technical specifications, the price basis, delivery terms and quality evidence together. A lower number is not a comparable offer if it covers a different grade, weight, coating or delivery scope.[1][2]

Iranian section markets use familiar names such as IPE, INP, IPB, industrial box section and furniture tube, but export orders need a complete technical designation. International buyers should reconcile geometry, grade and delivery condition with the destination project's approved tables and connection details. Compare actual lengths and mass in the agreed currency at a named port or project site, with straightness protection, loading, freight and certificates included. A similar nominal size or local commercial label does not establish structural equivalence.

Increased depth can change bending capacity, but web shear, Vierendeel action, local buckling, weld zones and stress concentrations around openings require specific checks. Parent-beam quality and cutting pattern are critical.[2][3][4]

Specify parent beam, grade, opening pattern, final depth, length, fabrication drawing, WPS, welding qualifications and inspection report. Compare offers only after aligning units, the weight basis, taxes, packaging, loading, freight and quote validity. An omitted cost can outweigh the apparent saving per kilogram. Keep the supplier’s currency and payment date visible before converting to your purchasing currency.

Ask every supplier to answer the same written specification. This prevents an apparently cheaper offer from silently changing the product or scope. Confirm the following before comparing prices:

Use this table to structure the decision. It does not replace engineering calculations or the contract. The final column identifies the evidence to review before accepting an offer.

Errors often begin when a trade name replaces a technical specification, one photograph stands for an entire shipment, or the delivery scope is missing from the quote. Address these specific risks: Fabrication without approved drawings; Discontinuous or defective welds; Openings near supports; Post-fabrication distortion. Turn each risk into a written acceptance criterion, sampling requirement or traceable document.

A standard number alone does not demonstrate conformity. Specify the edition, grade, dimensions, tolerances, test method, heat or batch number and acceptance authority. For an import project, confirm the destination’s requirements and the project’s approved specification; an Iranian market designation is not automatic evidence of an equivalent local grade.

A castellated beam is a fabricated member with changed behavior. Acceptance must address design, material, welding and geometry together.[4][5]

Before ordering, prepare a single comparison sheet covering the product, quantity, unit, theoretical and actual weight, base price, taxes, freight, delivery window, documents and acceptance criteria. Identify who pays each cost and who records discrepancies at receipt. This makes the negotiation clearer and gives the receiving team an agreed basis for checking the shipment.