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Help CenterSteel H Beam & H Beam，Q235B / SS400 / A36、Q355B / S355JR / A572 Gr50、Q235NH、Q355NH
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1. Product Overview
H section steel, also known as wide-flange H beam, is a high-efficiency economical load-bearing section steel. Its cross-section consists of parallel equal-thickness flanges and a vertical web; both flanges are flat without inclination, with large biaxial moment of inertia and superior bending & compression resistance compared with I-beams and channel steel. It is divided into hot rolled H section steel and welded H section steel, classified by flange width ratio into HW wide-flange, HM medium-flange, HN narrow-flange and HP pile H section steel. Three surface finishes are available: hot rolled black scale, pickled finish and hot-dip galvanized anti-corrosion coating. Featuring light self-weight, high bearing capacity and easy construction, it is widely applied in high-rise steel structure workshops, building beams & columns, bridges, wind turbine tower supports, dock foundation piles, heavy equipment bases, municipal viaducts and other heavy load-bearing projects.
Main Implementation Standards
Chinese National StandardsGB/T 11263-2024 Hot Rolled H and Cut T Section SteelGB/T 33814 Welded H Section SteelGB/T 700 Carbon Structural SteelGB/T 1591 Low Alloy High Strength Structural SteelGB/T 13912 Hot-dip Galvanized Metal CoatingsGB/T 34103 Hot Rolled H Section Steel for Offshore Engineering
International Export StandardsASTM A36, ASTM A992 W-series H beamsEN 10025 S235JR/S355JR, EN 10034 HE seriesJIS G3192 H section steel, JIS G3101 SS400
Supporting Test StandardsTensile test, high & low temperature Charpy impact test, 180° cold bending test, ultrasonic testing, sectional dimensional tolerance inspection, zinc coating weight test, neutral salt spray corrosion test
2. Main Steel Grades & Applicable Working Conditions
2.1 Q235B / SS400 / A36 Ordinary Carbon H Section Steel
Mechanical index: Yield strength ≥235MPa, excellent ductility, easy welding and optimal cost performance
Application: Ordinary single-story workshops, small steel structure frames, indoor equipment supports, auxiliary beams for ordinary inland bridges
Optional surfaces: Hot rolled black scale, pickled finish, hot-dip galvanized
2.2 Q355B / S355JR / A572 Gr50 Low Alloy High Strength H Section Steel (Mainstream Grade)
Mechanical index: Yield strength ≥355MPa, high strength, stable low-temperature impact toughness and excellent fatigue resistance for heavy loads
Application: Multi-story & high-rise factory buildings, beams & columns of high-rise buildings, long-span bridges, wind power supports, heavy-duty dock platforms, large open-air steel structures
2.3 Q235NH, Q355NH Weather Resistant H Section Steel
Performance: Superior atmospheric corrosion resistance, low maintenance painting frequency
Application: Open-air bridges, outdoor corridors, large billboards, coastal projects without severe salt fog
2.4 Q355NL Low-temperature Special H Section Steel
Performance: Qualified impact toughness at -20℃ / -40℃, no brittle fracture risk under low temperature
Application: Factories in frigid northern regions, polar engineering, support frames for low-temperature storage tanks
3. Specification Parameters
3.1 Classification & Section Characteristics
HW Wide-flange H Section Steel (Special for Columns)Section height ≈ flange width, square cross-section with strong compression & torsion resistance; sizes HW100×100 ~ HW400×400
HM Medium-flange H Section Steel (Universal for Beams & Columns)Height is 1.5~2 times flange width, balanced bending & compression performance; sizes HM150×100 ~ HM600×300
HN Narrow-flange H Section Steel (Special for Main Beams)Height far exceeds flange width, optimal unidirectional bending performance and lightweight design; sizes HN100×50 ~ HN900×300
HP Pile H Section Steel (Pile Foundation Engineering)Thick flanges and dense cross-section to meet high bearing capacity for piling construction
3.2 Size Range
Section Height H: 100mm ~ 900mm; Flange Width B: 50mm ~ 400mmWeb Thickness t1: 5mm ~ 26mm; Flange Thickness t2: 7mm ~ 39mm
3.3 Standard Fixed Length: 6m, 9m, 12m; customized random lengths 3–15m available
3.4 Dimensional Tolerance
Height, flange width, web & flange thickness, flatness and flange parallelness strictly comply with GB/T11263; galvanized coating thickness 45–85μm
3.5 Surface Types
Hot rolled black scale: Raw oxide surface with lowest cost for subsequent painting anti-corrosion
Pickled bright finish: Oxide scale removed, clean surface for direct painting & welding
Hot-dip galvanized finish: Thick sealed zinc coating for long-term rust prevention in buried, coastal and open-air environments
3.6 Size Marking Format: H Height × Flange Width × Web Thickness × Flange Thickness (Example: HN400×200×8×13)
4. Complete Production Process
4.1 Hot Rolled H Section Steel Process
Continuous casting slab heated to 1100–1250℃ → Multi-pass integrated H-section rolling via universal mill → Natural cooling on cooling bed → Special straightener to correct distortion & bending → Cut to fixed length → Shot blasting / pickling / hot-dip galvanizing (on request) → Full inspection, marking spraying & bundling
4.2 Welded H Section Steel Process
Steel plate blanking & cutting → Web & flange assembly + automatic submerged arc welding → Post-weld deformation straightening → Ultrasonic weld inspection → Finish machining, anti-corrosion treatment, inspection & warehousing
5. Mandatory Factory Inspection Items
Spectral composition analysis: Strict control of C, Mn, S, P impurities to match strength grades
Mechanical performance test: Room-temperature tensile, high & low temperature impact, 180° cold bending without cracks or lamination
Weld ultrasonic testing (for welded H beams): 100% UT inspection to detect internal slag, pores and weld cracks
Full sectional dimensional inspection: Height, flange width, web & flange thickness, flatness, flange parallelism
Special galvanized coating test (for galvanized H beams): Zinc coating weight, coating adhesion, neutral salt spray resistance duration
Visual surface inspection: Free of cracks, scabs, lamination, distortion, missing plating and rust spots
6. Main Application Fields
Industrial Construction: Single & multi-story steel structure factories, beams & columns of heavy workshops, main roof beams, load-bearing columns for equipment
High-rise Civil Buildings: Steel frames of office towers & residential buildings, basement supports, main structures of large exhibition venues
Road & Bridge Transportation: Main girders of long-span bridges, pier supports, viaducts, tunnel support, load-bearing frames for guardrails
New Energy Wind Power: Wind turbine tower supports, main frames of centralized photovoltaic power stations, energy storage equipment bases
Port & Offshore Engineering: Heavy-duty dock platforms, HP foundation piles, lightweight load-bearing components for offshore platforms
Municipal Open-air Works: Large viaduct billboards, urban light rail platforms, open-air corridors, hot-dip galvanized anti-corrosion open-air steel structures
7. Core Product Advantages
Balanced biaxial stress performance: Parallel equal-thickness flanges provide large moment of inertia on both X & Y axes, superior bending & compression resistance than I-beams to reduce auxiliary supports
Lightweight design: Thinner cross-section under identical bearing capacity to lower total steel consumption and project cost
Convenient processing & construction: Arbitrary cutting, welding, punching and splicing with simple joint connections to greatly shorten on-site construction period
Dual process options: Integrally hot rolled without weld defects for high-end heavy loads; welded H beams support customized oversized non-standard cross-sections
Complete anti-corrosion solutions covering dry indoor, rainy open-air, coastal salt fog and underground buried working conditions
Full range of models HW/HM/HN/HP with abundant spot stock, suitable for columns, main beams and pile foundation components
8. Delivery, Packing & Logistics
Delivery States
Hot rolled / welded black H beams: Raw black oxide surface
Pickled H beams: Clean gray-white surface without oxide scale
Hot-dip galvanized H beams: Matte thick zinc anti-corrosion coating
Marking: Metal tag attached to each bundle marked with material grade, model & dimension, execution standard, single piece weight and heat batch number
Packing Standard: Cross-bound with steel strips fixed on wooden pallets, covered with rainproof film; export heavy-duty seaworthy packing with inner moisture-proof paper
Delivery Lead TimeRegular in-stock Q235B/Q355B hot rolled HN/HM beams: Delivery within 3–7 days; customized HW wide-flange, HP pile grade, non-standard welded and hot-dip galvanized processed beams: 7–10 days, container & bulk carrier shipment available from Tianjin Port
Attached Shipping Documents: Original Mill Test Certificate, tensile & impact mechanical test report, weld UT inspection report, galvanized salt spray test record, factory certificate
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