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China Structural Steel Angle Bar Suppliers - High-Quality L-Shaped Steel from Reliable Factory

Angle steel, widely recognized as angle iron or L-shaped steel, is a fundamental structural steel section characterized by an L-shaped cross-section where two legs intersect at a 90-degree angle. As one of the most widely utilized forms of structural steel, angle steel is primarily manufactured in China through a hot-rolling process using high-quality low-carbon steel billets. Its simple yet robust design yields an outstanding strength-to-weight ratio, making it an ideal choice for load-bearing applications in various construction and industrial sectors. As a leading supplier and factory of angle steel, we are committed to providing durable and reliable products to meet the diverse needs of our customers

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

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 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 use. Unequal angle steel has legs of different lengths, offering directional strength advantages, making it better suited for trusses and structures with specific load direction requirements.

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 are widely stocked and used in 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 such as 304/L or 316/L (per ASTM A240) are recommended. Galvanized steel offers cost-effective protection, while stainless steel provides superior resistance in marine or chemical exposure conditions.

Q What international standards does angle steel comply with?

Angle steel can be produced in compliance with multiple international standards including ASTM (A36, A572, A992, A240, A123) from the USA, EN 10025 (S235JR, S355JR) from Europe, GB/T 1591 (Q235B, Q345B) from China, and JIS G3101 (SS400) from Japan, allowing it to meet global project requirements.

Q What surface finish options are available for angle steel?

Available surface finishes include natural/black (as-rolled mill scale), shot blasted or pickled (for clean surface preparation), primed or painted (shop-applied primer), hot-dip galvanized (zinc coating for corrosion protection), and oiled (temporary rust protection during shipping and storage).

Q What industries commonly use angle steel?

Angle steel is widely used across many industries including building construction, infrastructure (bridges, towers), industrial facilities, manufacturing and fabrication, transportation (trailers, ships, railways), renewable energy (solar and wind), marine and offshore structures, and agricultural applications such as greenhouses and farm buildings.