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Help CenterSteel Angle & Angle Bar，Q235B / SS400 / A36、Q355B / S355JR 、45#
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1. Product Overview
Angle steel, also known as angle iron, features an L-shaped cross-section, divided into equal angle steel and unequal angle steel. It is integrally hot rolled from carbon steel and low alloy steel billets with perpendicular neat edges, excellent bending and shear resistance, and easy processing for welding, punching, cutting and bending. Three surface finishes are available: hot rolled black scale, pickled bright finish and hot-dip galvanized anti-corrosion coating. As the basic supporting section steel for steel structure engineering, it is widely used in factory supports, transmission towers, bridges, guardrails, equipment bases, embedded connectors, ship auxiliary materials and municipal support projects.
Main Implementation Standards
Chinese National StandardsGB/T 706-2016 Hot Rolled Sections (Dimensions, Shape, Weight and Tolerance for Angle Steel)GB/T 700 Carbon Structural SteelGB/T 1591 Low Alloy High Strength Structural SteelGB/T 13912 Hot-dip Galvanized Metal Coatings
International Export StandardsASTM A36, ASTM A572 Gr50EN 10056-1, S235JR, S355JRJIS G3101 SS400, JIS G3192 Hot Rolled Angle Steel
Supporting Test StandardsTensile test, 180° cold bending test, 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 Angle Steel
Mechanical index: Yield strength ≥235MPa, good ductility, easy welding and optimal cost performance
Application: Ordinary factory supports, guardrails, small brackets, auxiliary transmission tower components, indoor embedded parts, simple municipal steel structures
Optional surfaces: Hot rolled black scale, pickled finish, hot-dip galvanized
2.2 Q355B / S355JR Low Alloy High Strength Angle Steel
Mechanical index: Yield strength ≥355MPa, high bearing capacity, stable low-temperature impact toughness and fatigue resistance
Application: Heavy factory beams and columns, large bridge supports, ship frames, open-air high-load steel structures, high-voltage transmission towers
2.3 45# Medium Carbon Machining Angle Steel
Performance: Quenched and tempered for adjustable hardness & strength, suitable for milling, drilling precision machining
Application: Machinery equipment bases, tooling fixtures, positioning supports, blanks for transmission equipment processing
3. Specification Parameters
3.1 Classification & Size Range
Equal Angle Steel (two legs with identical width)Leg width 20mm～250mm, leg thickness 3mm～30mm, examples: 20×20×3, 100×100×10, 200×200×20
Unequal Angle Steel (two legs of different widths)Long leg 25～200mm, short leg 16～125mm, thickness 3～24mm, examples: 100×63×6, 160×100×10
Standard Fixed Length: 6m, 9m, 12m; customized random lengths 3–15m available
Dimensional ToleranceLeg width, leg thickness, right-angle perpendicularity and straightness strictly comply with GB/T706; galvanized coating thickness 45–75μm
Surface Types
Hot rolled black scale: Raw oxide surface with lowest cost, suitable for subsequent painting anti-corrosion
Pickled bright angle steel: Oxide scale removed, clean gray-white surface for direct painting & welding
Hot-dip galvanized angle steel: Thick sealed zinc coating for long-term rust prevention in outdoor, buried and coastal salt fog environments
Theoretical Weight Formula for Equal Angle SteelWeight per meter (kg) = 0.00785 × Leg Thickness × (2 × Leg Width − Leg Thickness)
4. Complete Production Process
Billet Heating: Continuous casting slabs heated to 1100–1250℃ for uniform austenitization
Multi-pass Hot Rolling Forming: Continuous rough & finish rolling to form integrated L-shaped right-angle cross-section
Cooling & Straightening: Natural cooling on cooling bed, dedicated straightener to eliminate bending & distortion defects
Cut to Fixed Length: Sheared to standard lengths per customer requirements
Surface Treatment (on request): Shot blasting / pickling / hot-dip galvanizing & passivation
Full dimensional & visual inspection, marking spraying, bundling & warehousing
5. Mandatory Factory Inspection Items
Spectral composition analysis: Strict control of C, Mn, S, P impurities to match grade strength requirements
Mechanical performance test: Room-temperature tensile test, 180° cold bending test without cracks or lamination after bending
Full sectional dimensional inspection: Leg width, leg thickness, right-angle perpendicularity, straightness and end flatness
Special galvanized coating test (for galvanized angle steel): Zinc coating weight, coating adhesion and neutral salt spray resistance duration
Visual surface inspection: Free of cracks, scabs, lamination, distortion, missing plating and rust spots
6. Main Application Fields
Building Steel Structure: Factory beam & column supports, roof purlins, equipment brackets, embedded connectors, steel structure reinforcement
Power & Telecommunication Engineering: High-voltage transmission towers, photovoltaic supports, signal towers, substation frames, earthing brackets
Road & Bridge Municipal Works: Auxiliary bridge supports, road guardrails, tunnel support, fixing parts for municipal pipe networks
Ship & Offshore Engineering: Cabin internal supports, deck fixing parts, lightweight load-bearing components for offshore platforms
Machinery Manufacturing: Heavy equipment bases, tooling fixtures, stamping mold frames, conveyor equipment supports
Outdoor Anti-corrosion Engineering: Factory fences, photovoltaic supports, coastal factories, buried anti-corrosion supports (galvanized version)
7. Core Product Advantages
Balanced stress L-shaped cross-section: Bidirectional load bearing, superior anti-bending and shear resistance with tight fitting during assembly & splicing
Wide processing compatibility: Arbitrary cutting, punching, bending and welding adaptable to all on-site assembly processing
Complete anti-corrosion surface solutions: Black scale, pickled and hot-dip galvanized finishes fit dry indoor, clean indoor, humid outdoor & coastal heavy corrosion environments
Full grade coverage: Cost-effective ordinary carbon grade, high-strength low alloy for heavy loads, medium carbon for precision machining optional
Rich full-size series covering equal & unequal angle steel, abundant spot stock, customizable cut lengths to reduce customer waste
Integrally hot rolled without joints, stable structure, resistant to deformation and distortion under long-term load
8. Delivery, Packing & Logistics
Delivery States
Ordinary hot rolled angle steel: Black oxide raw surface, pickled gray-white bright surface
Hot-dip galvanized angle steel: Matte thick zinc anti-corrosion coating surface
Bar Marking: Metal tag attached to each bundle marked with material grade, dimension, execution standard, bundle weight and heat batch number
Packing Standard: Cross-bound with steel strips and fixed on wooden pallets, covered with rainproof film; export heavy-duty seaworthy packing with inner moisture-proof paper
Delivery Lead TimeRegular in-stock Q235B equal angle steel: Delivery within 3–7 days; customized Q355 high strength, large unequal size and hot-dip galvanized processing: 7–10 days, container shipment available from Tianjin Port
Attached Shipping Documents: Original Mill Test Certificate, tensile & cold bending mechanical test report, galvanized salt spray test record, factory certificate
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