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Help CenterSteel Angle & Hot Dipped Galvanized Angle Steel，ASTM A36、EN10056、JIS G3192、GOST535
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1. Product Overview
Commonly known as angle iron, steel angle bar is a hot-rolled long steel product with an L-shaped cross section and two legs forming a 90° vertical angle. It is divided into two main categories: equal angle steel and unequal angle steel, serving as the most fundamental and universal profile in steel structure engineering. Manufactured via hot rolling technology, the product features uniform sectional stress and supports cutting, drilling, welding and bending. It is widely applied for load-bearing, supporting and connecting structures in architectural infrastructure, municipal engineering, electric power, mechanical equipment and various other engineering scenarios.
2. Product Classification and Specification Parameters
2.1 Equal Angle Steel
Marking Format: L leg width × leg width × thickness (Example: L50×50×5)
Leg width range: 20#~200#, 20mm–200mm
Thickness: 3mm–24mm
Standard single-piece length: 6m / 9m / 12m; customized fixed lengths from 3m to 19m are available with a cutting tolerance of ±1mm
Theoretical Weight Formula: W(kg/m)=0.00785 × thickness × (2 × leg width − thickness)
2.2 Unequal Angle Steel
Marking Format: L long leg × short leg × thickness (Example: L75×50×6)
Long leg: 25mm–200mm, Short leg: 16mm–125mm
Thickness: 3mm–18mm
Standard length is consistent with equal angle steel; non-standard cutting and fixed-length processing are supported
2.3 Common Standard Specifications
Specification |
Theoretical Weight (kg/m) |
Application Scenarios |
L40×40×4 |
2.42 |
Small brackets, curtain wall secondary keels, light-duty frames |
L50×50×5 |
3.73 |
Factory secondary structures, photovoltaic brackets, equipment support frames |
L100×100×8 |
12.20 |
Factory main beams, power transmission towers, heavy-load bearing structures |
L75×50×6 |
5.69 |
Cable trays, equipment bases, municipal small support structures |
L125×80×10 |
15.50 |
Heavy-duty steel structures, bridge reinforcement, large-scale equipment frames |
3. Main Materials and Mechanical Properties
3.1 Carbon Structural Steel (General Engineering Grade)
3.1.1 Q235B (A36/S235JR)
Yield strength ≥235MPa, carbon content ≤0.22%, manganese content 0.30~0.65%, sulfur and phosphorus content ≤0.045%. Featuring good toughness, high plasticity and cost performance, it is the preferred material for indoor ordinary steel structures and light-duty support structures.
3.1.2 Q355B (S355JR)
A low-alloy high-strength steel with yield strength ≥355MPa. It boasts far higher bearing capacity, compression and bending resistance than ordinary carbon steel and superior structural stability, suitable for heavy-duty factories, bridges, wind power brackets, large-scale infrastructure and other heavy-load scenarios.
3.2 Anti-Corrosion Special Material
Hot-dip galvanized angle steel: Manufactured by hot-dip galvanizing treatment on Q235B and Q355B base steel, with a zinc layer thickness of 60–120μm. It features excellent rust and corrosion resistance, adapting to outdoor, coastal, humid and corrosive chemical environments, and is widely used in municipal, electric power and outdoor engineering projects.
4. Execution Standards (National & International General Standards)
4.1 Domestic Standards
GB/T 706-2016 Hot-rolled section steel - Dimensions, shape, weight and allowable deviation
GB/T 700-2006 Carbon structural steels
GB/T 2101 General specification for acceptance, packaging and marking of section steel
4.2 International Equivalent Standards
ASTM A36 (US Standard), EN10056 (European Standard), JIS G3192 (Japanese Standard), GOST535 (Russian Standard)
5. Production Technology
5.1 Hot Rolling (Mainstream Product)
Steel billet heating → high-pressure water descaling → multi-pass rough rolling and finish rolling forming → cooling on cooling bed → straightening → fixed-length cutting → inspection and packaging
Advantages: Dense internal structure, precise 90° angle (±0.5°), no distortion and stable bearing performance, specially applied for various main force-bearing structures.
5.2 Cold-Formed Angle Steel (Light-Duty Decoration)
Formed by cold bending of thin steel plates with high precision and smooth surface. It is only used for light-duty non-load-bearing frames and decorative enclosures, not recommended for load-bearing applications in large-scale infrastructure.
6. Surface Treatment Types
Black Hot-Rolled (Raw Angle Steel): Original factory state with slight oxide scale, lowest cost, suitable for indoor dry and non-corrosive ordinary engineering environments.
Hot-Dip Galvanized Angle Steel: Adopts high-temperature overall hot-dip galvanizing process with uniform zinc layer and strong adhesion. The anti-corrosion service life can reach 10–20 years, serving as the standard product for outdoor, coastal, municipal and electric power projects.
Painted/Rust-Proof Coating: Simple anti-corrosion treatment with moderate cost, applicable for short-term outdoor and temporary engineering protection.
7. Core Product Advantages
Stable Structure: The special L-shaped cross section delivers excellent multi-directional bending and compression resistance, saving material consumption under the same load and ensuring high structural safety.
Convenient Processing: The steel material features high plasticity, supporting arbitrary cutting, drilling, welding and bolt connection, with simple on-site assembly and high construction efficiency.
Complete Specifications: Full-range in-stock specifications, supporting customized fixed-length cutting, punching, bending and other deep processing services for non-standard sizes.
Wide Adaptability: Covers both light and heavy load scenarios, with multiple options of raw steel and galvanized anti-corrosion steel to adapt to different working conditions and budget requirements.
High Cost Performance: Carbon steel features stable performance and affordable price with mature production technology and stable supply, suitable for bulk procurement of various engineering projects.
8. Main Application Fields
Building Steel Structure: Factory columns, roof purlins, curtain wall keels, steel structure frames, stair guardrails, indoor support structures
Electric Power and Communication: High-voltage transmission towers, base station brackets, photovoltaic supports, power equipment fixing frames
Mechanical Engineering: Equipment bases, machine tool frames, lifting equipment supports, mechanical fixing brackets
Road, Bridge and Municipal Engineering: Bridge reinforcement, tunnel support, road guardrails, municipal pipeline brackets, outdoor protective structures
Ship and Container Industry: Auxiliary hull frames, container accessories, port equipment support structures
Warehousing and Hardware: Warehouse shelves, storage brackets, small metal frames, temporary construction steel structures
9. Quality Inspection Standards
Dimensional Tolerance: Leg width, thickness, lateral bending and torsion strictly comply with GB/T 706 standard, with bending deflection ≤3mm per meter and controllable dimensional errors.
Surface Requirements: No cracks, delamination, scabs, deep pits, slag inclusions and other defects on the surface; slight uniform oxide scale is acceptable as normal factory delivery state.
Mechanical Testing: Each batch of products passes tensile and cold bending tests with qualified mechanical properties. Original factory material test certificates (MTC) and quality inspection reports are available.
Galvanized Layer Detection (Galvanized Products): Strictly test zinc layer thickness and adhesion, ensuring no missing plating, peeling, falling off, black spots and other quality defects with qualified anti-corrosion performance.
10. Packaging, Delivery and Lead Time
Packaging: Products of the same specification are bundled and fixed with high-strength steel strips; galvanized products are wrapped with protective films and end protection to prevent collision and scratch during transportation, compatible with pallet and container loading.
Shipping Ports: Tianjin Port, Shanghai Port, Qingdao Port (support national domestic delivery and foreign trade shipment)
Delivery Cycle: 5–7 days for conventional in-stock specifications.
Payment Terms: 30% TT deposit, balance paid before shipment.
Weight Settlement: Support two settlement methods: theoretical calculated weight and actual weighed weight for optional selection.
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