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China Structural Steel Angle Bar Suppliers - High-Quality L-Shaped Steel from Reliable Factory for Construction & Industrial Use

Angle steel, commonly referred to as angle iron, steel angle, or L-shaped steel, is a crucial structural component featuring an L-shaped cross-section formed by two legs at a 90-degree angle. Produced through a hot-rolling process using low-carbon steel billets, angle steel is one of the most fundamental and widely used types of structural steel in the industry. Thanks to its straightforward yet effective geometry, it offers an exceptional strength-to-weight ratio, making it ideal for various load-bearing applications in construction and industrial sectors. As a leading factory in China, we supply high-quality angle steel products to meet the diverse needs of our customers and partners globally. Whether you're looking to enhance your construction projects or industrial applications, our reliable angle steel solutions from trusted China suppliers provide the durability and performance required for success

Product Details

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
High Strength	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 two legs of the same length, providing symmetric load distribution and making it ideal for general structural frameworks. Unequal angle steel has legs of different lengths, offering directional strength that suits trusses and structures requiring optimized load resistance along a specific axis.

Q What material standards are available for angle steel?

Angle steel is produced under multiple international standards including ASTM (A36, A572, A992, A240, A123), EN 10025 (S235JR, S275JR, S355JR), GB/T 1591 (Q235B, Q345B), and JIS G3101 (SS400, SS490). The choice depends on the project's strength requirements and regional specifications.

Q What surface finish options are available for angle steel?

Available surface finishes include natural/black (as-rolled), shot blasted or pickled, primed/painted, hot-dip galvanized (per ASTM A123), and oiled. Hot-dip galvanizing provides the highest level of corrosion protection, while oiling is used for short-term transit protection.

Q What are the standard lengths 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 are widely stocked and suitable for most construction and fabrication projects.

Q Which industries commonly use angle steel?

Angle steel is widely used across building construction, infrastructure (bridges, towers), industrial facilities, manufacturing, transportation, renewable energy, marine/offshore, and agriculture. Its versatility in size, material grade, and finish makes it one of the most broadly applied structural steel profiles.

Q What grade of angle steel should I choose for outdoor or corrosive environments?

For outdoor or corrosive environments, hot-dip galvanized steel (ASTM A123) or stainless steel grades 304/L and 316/L (ASTM A240) are recommended. Stainless steel 316/L offers superior resistance to chloride environments such as marine and offshore applications, while galvanized steel is cost-effective for general outdoor use.