How to Specify H Beam for International Steel Projects

Introduction

H beams (wide-flange beams) are the backbone of structural steel construction — used in buildings, bridges, industrial plants, and infrastructure projects worldwide. For international procurement teams and consulting engineers, a complete and accurate specification is the difference between a smooth delivery and costly rework or delays.

This guide walks through the essential parameters to specify when requesting H Beam quotations for international steel projects, from standards and grades to dimensions, documentation, and shipping.

1. Confirm the Applicable Standard

Different regions use different standard designations for H beam sections. Confirm which standard governs your project before sending an RFQ:

• GB/T 11263 (China) — HW (wide flange), HM (medium flange), HN (narrow flange). Example: HW300×300×10×15 denotes 300 mm depth, 300 mm flange, 10 mm web, 15 mm flange thickness.
• EN 10034 (Europe) — HEA (light), HEB (standard), HEM (heavy) series. HEB is the workhorse for European building frames.
• ASTM A6 / A36 (USA) — W-shapes. Example: W12×65 denotes a nominal 12-inch deep wide-flange beam weighing 65 lb/ft.
• JIS G3192 (Japan) — H-shapes with metric depth × width × web × flange naming, closely aligned with the GB system.

When sourcing from China, your supplier should supply against any of these standards. A cross-reference table between GB, EN, and ASTM equivalents is essential for bid evaluation. See our quality standards for more details.

2. Specify Steel Grade

The steel grade determines weldability, ductility, and load-carrying capacity. Common grades for international projects sourced from China include:

• Q235B — Mild steel, 235 MPa yield. General structural applications where high strength is not critical.
• Q355B — HSLA steel, 355 MPa yield. The most commonly specified grade for building frames and bridges. Equivalent to S355JR under EN 10025-2.
• SS400 — Japanese standard mild steel. Widely used in Southeast Asian projects.
• A36 — American standard structural steel, minimum 250 MPa yield. Common in Middle Eastern and Latin American projects.
• A572 Gr.50 — American HSLA steel, 345 MPa yield. Used for bridges and heavy structures.
• S275JR / S355JR — European standard structural steels under EN 10025-2. S355JR maps closely to Q355B.

Always specify whether Charpy impact testing is required (e.g., at 0°C or -20°C), especially for cold-climate projects. Explore our structural steel product range for available grades and sizes.

3. Provide Section Dimensions

When specifying H beam dimensions, include all five critical parameters to avoid ambiguity:

• Section height (H) — Typically 100–1,100 mm for hot-rolled sections from Chinese mills. Sections above 900 mm may have longer lead times.
• Flange width (B) — For wide-flange sections, the flange width is equal or nearly equal to the section height.
• Web thickness (t1) — Typically 5–21 mm. The web governs shear capacity.
• Flange thickness (t2) — 7–40 mm. The flange governs bending moment capacity.
• Length — Standard mill lengths: 6 m, 9 m, 12 m, 18 m. Custom lengths up to 24 m available on special order.

Always specify whether length tolerances follow the standard default (typically +100/-0 mm for GB) or a tighter project-specific requirement.

4. Quantity and Project Requirement

Provide clear quantity and project information so your supplier can plan mill production and logistics effectively:

• Quantity — Number of pieces and/or total tonnage
• Project use — Building frame, bridge, platform, equipment support, or other application
• Delivery schedule — Required delivery date or window
• Bundle preference — Standard 2–3 tonne bundles, or lighter 1–2 tonne bundles for manual offloading sites

For large-volume orders, discuss optimized mill lengths with your supplier — custom lengths can reduce scrap and lower overall freight cost per tonne.

5. Surface and Processing Requirements

H beams typically leave the mill with a hot-rolled finish — a thin, dark oxide scale layer. For international shipping, consider the following surface treatments:

• Mill finish — Sufficient for concrete-embedded or hidden applications
• Shot blasting — Removes mill scale to SA 2.5 cleanliness for paint or primer adhesion
• Shop primer — 15–25 µm anti-corrosion coating applied after blasting, providing 3–6 months of transit protection
• Anti-rust oil — Light oil coating for short-term transit protection, suitable when steel will be blasted and painted on site

For coastal or corrosive environments, we recommend at minimum a shop primer, as unprotected mill-scale steel can develop surface rust during ocean transit.

6. Inspection and Documentation

A complete quality documentation package protects both the buyer and the project. For each shipment, require:

• Mill Test Certificate per EN 10204 3.1 — The minimum standard for international steel trade. Confirms chemical composition, yield strength, tensile strength, and elongation for each heat/lot.
• Dimensional inspection report — Per-lot measurements of section height, flange width, web/flange thickness, and straightness.
• Third-party inspection — SGS, Bureau Veritas, or TUV inspection at the mill or loading port on request. Recommended for critical or large orders.
• Loading photographs — Document container or breakbulk loading with bundle tags visible, essential for claims handling.

Always cross-check that MTC heat numbers match the bundle tags on your shipment.

7. Packing and Shipping Information

H beams present unique shipping challenges due to their length and weight concentration:

• Container loading — 20'GP holds ~20–22 tonnes; 40'GP holds ~24–26 tonnes. Sections longer than 11.8 m require a 40' container or breakbulk.
• Breakbulk / flat-rack — Required for sections exceeding 12 m length. Higher freight cost but necessary for long-span beams.
• Destination port — Confirm the port's offloading crane capacity for heavy breakbulk steel sections.
• Incoterm — FOB, CFR, or CIF as agreed in the purchase contract.

Our export services team handles container loading plans optimized for weight, volume, and destination port constraints.

8. RFQ Checklist

Use this checklist when sending your H beam inquiry to ensure a complete specification:

• Standard (GB/T 11263, EN 10034, ASTM A6, or JIS G3192)
• Steel grade (Q235B, Q355B, SS400, A36, A572 Gr.50, S275JR, or S355JR)
• Section size (height × flange width × web thickness × flange thickness)
• Length (standard or custom)
• Quantity (pieces and/or tonnage)
• Destination port
• Delivery term (FOB, CFR, CIF)
• Inspection requirement (EN 10204 3.1, third-party inspection)

Conclusion

A complete H beam specification helps avoid standard confusion, grade mismatches, dimensional errors, and shipping problems. If you are preparing a structural steel inquiry, contact us with your section list, grades, tonnage, and destination port — we respond within 12 working hours with a quotation covering grade, size, quantity, delivery terms, and lead time.

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