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China Structural Steel Angle Bar - Suppliers and Factory for Construction and Industrial Applications

Angle steel, commonly referred to as angle iron or steel angle, features a distinctive L-shaped cross-section formed by two legs that meet at a 90-degree angle. This versatile structural steel section, manufactured primarily in China, is produced through a hot-rolling process utilizing low-carbon steel billets. As one of the most essential and widely utilized types of structural steel, angle steel offers an exceptional strength-to-weight ratio, making it an ideal choice for various load-bearing applications in construction and industrial sectors. Many suppliers and factories in China provide high-quality angle steel to meet the demands of global markets

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

Q1 What is the difference between equal and unequal angle steel?

Equal angle steel has both legs of identical length, providing symmetric stress distribution — ideal for general structural applications. Unequal angle steel has legs of different lengths, offering directional strength that suits trusses, reinforcements, and structures where loads act predominantly in one direction.

Q2 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. Wall thickness varies from 2.0 mm to 25 mm depending on the size. Standard lengths are 6 m, 9 m, and 12 m, with custom lengths available from 3 m to 19 m.

Q3 Which material grade is most commonly used for structural angle steel?

The most widely used grades are ASTM A36 (general structural carbon steel with 36,000 psi yield strength), EN 10025 grades such as S235JR and S355JR, and GB/T 1591 grades Q235B and Q345B. For higher load-bearing applications, ASTM A572 Grade 50 or Grade 60 is preferred.

Q4 What surface finish should I choose for outdoor or corrosive environments?

For outdoor or corrosive environments, hot-dip galvanized finish (per ASTM A123) is the most effective option, providing a durable zinc coating that prevents rust. For marine or offshore applications, stainless steel grades 304/L or 316/L offer superior corrosion resistance.

Q5 Can angle steel be used in renewable energy projects?

Yes. Angle steel is widely used as supporting frames for solar panel installations and as structural components in wind tower foundations. Galvanized or stainless steel variants are preferred for outdoor renewable energy applications due to their long-term corrosion resistance.

Q6 What industries use angle steel most frequently?

Angle steel is used across a broad range of industries including building construction, infrastructure (bridges and towers), industrial facilities, manufacturing and fabrication, transportation (trailers and shipbuilding), renewable energy, marine and offshore, and agricultural applications such as greenhouse structures.