Structural Steel Angle Bar from China Suppliers | High-Quality Factory Production for Construction and Industrial Applications
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
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Natural / Black Finish As-rolled with mill scale
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Shot Blasted / Pickled Clean surface for painting or further treatment
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Primed / Painted Shop-applied primer coating
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Hot-Dip Galvanized Zinc coating per ASTM A123 for corrosion protection
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Oiled Temporary rust protection during transit
Applications
Building Construction
Used extensively in structural frameworks, roof trusses, columns, beams, and bracing systems for residential, commercial, and industrial buildings.
Infrastructure Projects
Essential components in bridges, transmission towers, telecommunication towers, and highway guardrails where structural integrity is critical.
Industrial Facilities
Applied in factory buildings, equipment supports, crane runways, conveyor systems, and storage racks.
Manufacturing & Fabrication
Used for machine frames, workbenches, brackets, shelving supports, and custom fabrications across various industries.
Transportation
Employed in 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 provide corrosion resistance for 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 load distribution suitable for general structural applications. Unequal angle steel has legs of different lengths, offering directional strength advantages for specific load-bearing scenarios such as trusses and reinforcements.
Q
What are the standard lengths available for angle steel?
Angle steel is typically 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. Galvanized options are cost-effective for general outdoor use, while stainless steel grades are preferred for marine and highly corrosive conditions.
Q
What international standards are available for angle steel?
Angle steel is manufactured to multiple international standards including ASTM (A36, A572, A992, A240, A123) for the US market, EN 10025 (S235JR, S275JR, S355JR) for European markets, GB/T 1591 (Q235B, Q345B) for Chinese standards, and JIS G3101 (SS400, SS490) for Japanese standards.
Q
What surface finish options are available for angle steel?
Angle steel is available in several surface finishes: Natural/Black (as-rolled mill scale), Shot Blasted or Pickled (clean surface ready for coating), Primed/Painted (shop-applied primer), Hot-Dip Galvanized (zinc coating for corrosion protection), and Oiled (temporary rust protection for transit and storage).
Q
Can angle steel be used in renewable energy projects?
Yes, angle steel is widely used in renewable energy applications. It serves as supporting frames for solar panel installations and forms structural components for wind tower foundations. Its high strength-to-weight ratio and versatility make it a preferred material for these demanding structural requirements.