China Structural Steel Angle Bar Suppliers | Industrial & Construction Applications from Reliable Factory
Specifications
| Parameter | Range / Options |
| Size Range (Equal) | 20×20 mm – 250×250 mm (2# – 20# in Chinese standard) |
| Size Range (Unequal) | 25×16 mm – 200×125 mm |
| Wall Thickness | 2.0 mm – 25 mm (varies by size) |
| Length | 3 m – 19 m (standard: 6m, 9m, 12m) |
Material Standard
| Material Type | Standard | Common Grades |
| Carbon Steel | ASTM A36 | A36 (general structural, 36,000 psi yield) |
| EN 10025 | S235JR, S275JR, S355JR/J0/J2 | |
| GB/T 1591 | Q235B, Q345B (equivalent to S235JR/S355JR) | |
| JIS G3101 | SS400, SS490, SS540 | |
| High Strength | ASTM A572 | Grade 50, Grade 60 |
| ASTM A992 | High-strength low-alloy for load-bearing frames | |
| Stainless Steel | ASTM A240 | 304/L, 316/L (corrosion-resistant applications) |
| Galvanized | ASTM A123 | Hot-dip galvanized coating on base steel |
Types of Angle Steel
Equal Angle Steel
Both legs have identical length, forming a symmetric L-profile. This balanced geometry distributes stress evenly along both axes, making it ideal for uniform frameworks, square frames, racks, and general structural applications where loads come from multiple directions.
Unequal Angle Steel
Legs have different lengths, creating directional strength characteristics. The longer leg increases the moment of inertia about one axis, improving stiffness and load resistance in that specific direction. Commonly used in trusses, reinforcements, and structures requiring optimized load distribution.
Surface Finishes
- Natural / Black Finish: As-rolled with mill scale
- Shot Blasted / Pickled: Clean surface for painting or further treatment
- Primed / Painted: Shop-applied primer coating
- Hot-Dip Galvanized: Zinc coating per ASTM A123 for corrosion protection
- Oiled: Temporary rust protection during transit
Applications
Building Construction
Structural frameworks, roof trusses, columns, beams, and bracing systems for residential, commercial, and industrial buildings.
Infrastructure Projects
Bridges, transmission towers, telecommunication towers, and highway guardrails where structural integrity is critical.
Industrial Facilities
Factory buildings, equipment supports, crane runways, conveyor systems, and storage racks.
Manufacturing & Fabrication
Machine frames, workbenches, brackets, shelving supports, and custom fabrications across various industries.
Transportation
Trailer manufacturing, vehicle frames, shipbuilding, and railway structures.
Renewable Energy
Supporting frames for solar panel installations and wind tower foundations.
Marine and Offshore
Stainless steel or galvanized angles for corrosion resistance on docks, piers, and offshore platforms.
Agricultural Applications
Greenhouse structures, livestock equipment, and farm building frameworks.
Frequently Asked Questions
Q
What is the difference between equal and unequal angle steel?
Equal angle steel has two legs of the same length, providing symmetric stress distribution suitable for general structural use. Unequal angle steel has legs of different lengths, offering directional strength advantages for trusses and reinforcements where load is applied in a specific direction.
Q
What standard lengths are available for angle steel?
Angle steel is available in lengths ranging from 3 m to 19 m. The most common standard lengths are 6 m, 9 m, and 12 m, which suit the majority of construction and fabrication projects.
Q
Which material grade is best for outdoor or corrosive environments?
For outdoor or corrosive environments, hot-dip galvanized angle steel (per ASTM A123) or stainless steel grades 304/L and 316/L (per ASTM A240) are recommended. These options provide excellent corrosion resistance for marine, offshore, and outdoor applications.
Q
What surface finish options are available for angle steel?
Available surface finishes include natural/black (as-rolled mill scale), shot blasted/pickled, shop-primed/painted, hot-dip galvanized (ASTM A123), and oiled for temporary rust protection during transit. The choice depends on the application environment and downstream processing requirements.
Q
What international material standards does angle steel comply with?
Angle steel is produced to multiple international standards including ASTM (A36, A572, A992, A240, A123), European EN 10025 (S235JR, S275JR, S355JR), Chinese GB/T 1591 (Q235B, Q345B), and Japanese JIS G3101 (SS400, SS490, SS540), covering a wide range of structural and high-strength requirements.
Q
In which industries is angle steel most commonly used?
Angle steel is widely used across building construction, infrastructure (bridges, towers, guardrails), industrial facilities, manufacturing and fabrication, transportation (trailers, shipbuilding, railways), renewable energy (solar and wind), marine and offshore structures, and agricultural applications such as greenhouses and farm buildings.