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Help CenterSteel Angle & Angle Bar，Q195、Q235B、Q355B、Q390B、Q420B、Q355NH
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1. Product Overview
Angle steel, also known as angle iron, is L-shaped hot rolled long section steel with 90° vertical two sides, only produced from carbon & HSLA steel without stainless steel grades. Divided into equal leg angle steel and unequal leg angle steel, with two surface options: black hot rolled angle steel & hot-dip galvanized anti-corrosion angle steel. Its vertical L-shape delivers excellent bending & compression resistance, available for cutting, drilling, welding and bolt assembly. Widely used as structural supports, trusses, tower frames, embedded parts, cable trays and guardrails, it is one of the most consumed section steel for civil construction, power, machinery, photovoltaic and overseas infrastructure projects.
2. Applicable Standards
Domestic Chinese Standards
GB/T 706-2016 Hot Rolled Section Steel (Core standard for dimension & weight of equal & unequal angle steel)
GB/T 700 Carbon Structural Steel, GB/T 1591 HSLA Structural Steel
GB/T 13912 Technical Specification for Hot-Dip Galvanized Coating (for galvanized angle steel)
International Export Standards
ASTM A36/A572, EN10025, JIS G3101, DIN10056, ISO 630
Supporting Certifications
SGS mechanical & salt spray test report, original Mill Test Certificate (MTC), CE structural steel certification, zinc coating adhesion test report
3. Main Material Grades
3.1 Ordinary Carbon Angle Steel (Civil buildings, light supports, guardrails)
Q195, Q235B; export equivalent S235JR, A36, SS400, good ductility & weldability with top cost performance
3.2 HSLA High Strength Angle Steel (Heavy-duty factories, bridges, transmission towers, PV supports)
Q355B, Q390B, Q420B; export S355JR, high yield strength to resist deformation under snow & heavy loads
3.3 Weather Resistant Angle Steel (Coastal open-air revetment)
Q355NH, Cu-Ni alloy elements to resist marine salt spray and reduce repainting maintenance
4. Product Classification & Process Features
(1) By Cross Section Shape
Equal Leg Angle Steel (Mainstream Market Grade)Two legs with identical width, marked as ∠leg width × thickness e.g. ∠50×50×5; symmetrical stress bearing, widely used for factory trusses, warehouse supports and foundation embedded parts.
Unequal Leg Angle Steel (Asymmetric Load Structures)Long leg + short leg with different widths, marked as ∠long leg × short leg × thickness e.g. ∠100×63×8; designed for unbalanced load demand, ideal for pipe supports, beam-column joints and equipment bases.
(2) By Surface Treatment
Hot Rolled Black Angle Steel (Indoor General Use)Integrally hot rolled at high temperature with uniform mill scale on surface, low cost, preferred for indoor factories, embedded components and indoor cable trays.
Hot-Dip Galvanized Angle Steel (Outdoor Anti-Corrosion)Whole finished angle steel hot-dip galvanized, zinc coating weight 60–275g/㎡, neutral salt spray test 500–1200h, dedicated for substation grounding, coastal guardrails, outdoor PV supports and water conservancy projects.
5. Complete Production Process
Hot Rolled Black Angle Steel Process
Slab heating at 1100–1250℃ → High pressure water descaling → Multi-pass mill rolling for L-section → Uniform cooling on cooling bed → Roller straightening to eliminate bending → Fixed-length flame cutting → Sampling mechanical test → Steel marking with size & heat batch number → Multi-circumferential steel strapping & steel-wood pallet warehousing
Galvanized Angle Steel Process
Degreasing & cleaning of black angle steel → Pickling rust removal → Flux treatment → Hot dip galvanizing pool coating → Cooling & passivation → Edge trimming & zinc coating thickness inspection → Moisture-proof film wrapping & packaging
6. Core Technical Parameters
6.1 Size Range
Equal leg width: 20mm～200mm; Unequal leg long side 50–200mm, short side 32–125mm
Leg thickness: 3mm～20mm
Standard fixed length: 6m, 9m, 12m, customized cutting length 4–15m available
Single piece weight calculated per national theoretical weight, total weight tolerance ±4%
6.2 Reference Key Mechanical Properties
Q235B: Yield ≥235MPa, Tensile 375–500MPa, Elongation ≥25%, intact after 180° cold bending without cracks
Q355B: Yield ≥355MPa, Tensile 470–630MPa, Elongation ≥21%, anti-deformation & impact resistance under heavy load
6.3 Dimension & Surface Requirements
Leg width tolerance: ±1mm for size ≤56#, ±1.5mm for size ＞56#; thickness tolerance ±0.3~0.5mm; bending deflection ≤4mm per meter
Black steel surface: free of lamination, scar & penetrating cracks; galvanized steel with uniform zinc coating without missing plating, peeling or burrs.
6.4 Machining Performance
Controllable carbon equivalent, compatible with SMAW, SAW & spot welding; support random cutting, punching, bending & bolt connection without brittle fracture after processing.
7. Core Product Advantages
Integral 90° L-shape with high structural rigidityBalanced bidirectional stress distribution, resistant to torsion & deformation, truss & tower frames need less auxiliary reinforcement compared with flat steel plate blanking to save material cost.
Two cross-section types cover symmetrical & asymmetrical load scenariosEqual leg grade for regular balanced supports; unequal leg grade solves unilateral heavy load demand to fit complex steel structure joint design.
Dual anti-corrosion solutions for indoor & coastal open-air serviceLow-cost black steel for indoor use; long-life galvanized coating extends service life by 3–5 years for seaside, chemical and open-air projects.
Full size spot stock & one-stop deep processing serviceFull range sizes from small 20# light supports to heavy 200# tower profiles in stock, support cutting, punching, beveling, hot-dip galvanizing & shot blasting pretreatment.
Easy welding & drilling to boost construction efficiencyFlat smooth sides without burrs, no on-site polishing required, compatible with both bolt & welded connection to greatly shorten installation period.
Complete export customs clearance documents for bulk overseas civil engineering ordersSupply SGS mechanical & salt spray test report, CE certification & original MTC certificate for container bulk export to Southeast Asia, Middle East and Africa infrastructure projects.
8. Main Application Fields
8.1 Steel Structure Factory Engineering
Factory roof truss, column support, warehouse shelf frame, boundary guardrail, PV support, factory reinforcement tie rod & embedded foundation angle steel
8.2 Electric Power & Communication Industry
High voltage transmission tower, communication base station tower, galvanized grounding angle steel for substation, cable tray, distribution box base & signal tower reinforcement parts
8.3 Municipal & Bridge Engineering
Bridge reinforcement support, road anti-collision guardrail, tunnel embedded steel structure, municipal pipe support & pedestrian overpass auxiliary frame
8.4 Machinery Manufacturing Equipment
Machine tool base, conveying equipment support, agricultural machinery frame, fan housing frame & construction machinery auxiliary load-bearing parts
8.5 Water Conservancy & Coastal Anti-Corrosion Engineering
River protection steel structure, water plant equipment support, coastal galvanized guardrail, mariculture enclosure support & sewage treatment equipment frame
8.6 Container, Prefab House & Overseas Civil Engineering
Auxiliary frame material for containers, light steel keel for prefab houses, overseas residential & factory buildings, storage yard protective support
9. Packaging, Shipment & Lead Time
Packaging Methods
Domestic hot rolled black angle steel: Stacked by same size, multi-circumferential steel strapping, supported by steel-wood pallets, iron corner guards to prevent end collision damage, simple anti-rust film wrapped on ends
Hot-dip galvanized angle steel: Whole pallet wrapped with thickened waterproof plastic film to avoid zinc coating scratch during transportation
Export dedicated packaging: Fixed on IPPC fumigated wooden pallets with full moisture-proof film covering, fit for 20GP / 40HC container sea transportation
2. Delivery Warehouse: Spot goods shipped directly from Tianjin Port
3. Lead Time: 5–7 days for regular Q235B equal leg angle steel stock goods; 10–15 days for customized unequal leg, galvanized & Q355 high strength orders
4. Payment Term: 30% TT advance deposit, balance settled before shipment, L/C letter of credit is not accepted.
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