China Suppliers Factory for Structural Steel Angle Bar - Durable L-Shaped Steel for Construction and Industrial Use
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
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 both legs of the same length, providing symmetric load distribution and making it suitable for general structural use. Unequal angle steel has legs of different lengths, which increases stiffness along one axis — ideal for trusses and structures with directional load requirements.
Q
What standard sizes are available for angle steel?
Equal angle steel ranges from 20×20 mm to 250×250 mm, while unequal angle steel ranges from 25×16 mm to 200×125 mm. Standard lengths are 6m, 9m, and 12m, with custom lengths available from 3m to 19m.
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 structural applications.
Q
What surface finishes are available for angle steel?
Angle steel is available in multiple surface finishes including natural/black (as-rolled), shot blasted or pickled, primed/painted, hot-dip galvanized, and oiled. The choice depends on the intended environment and downstream fabrication requirements.
Q
What international standards does your angle steel comply with?
Our angle steel is produced in compliance with major international standards including ASTM (A36, A572, A992, A240, A123), EN 10025 (S235JR, S275JR, S355JR), GB/T 1591 (Q235B, Q345B), and JIS G3101 (SS400, SS490, SS540), covering North American, European, Chinese, and Japanese requirements.
Q
What are the most common applications for structural angle steel?
Structural angle steel is widely used in building construction, infrastructure (bridges, towers), industrial facilities, manufacturing, transportation, renewable energy frameworks, marine and offshore structures, and agricultural applications. Its versatility and cost-effectiveness make it one of the most commonly used structural steel profiles globally.