Q195 Q215 Q235 Q255 Q275 40*40 45*45 50*50 56*56 Angle Steel Perforated Slotted Angle

Our Q195, Q215, Q235, Q255, and Q275 hot-rolled angle steel series, available in standard sizes of 40×40mm, 45×45mm, 50×50mm, and 56×56mm, represents a comprehensive line of carbon structural steel profiles engineered for high-reliability structural and industrial applications. Characterized by their iconic L-shaped cross-section, these angle steels combine precise dimensional control, graded mechanical performance, and exceptional versatility-making them foundational components in construction, manufacturing, and infrastructure projects worldwide.​

Material Grades & Mechanical Properties​

This series encompasses five key carbon steel grades, each tailored to specific load-bearing and fabrication requirements, all compliant with GB/T 700 (Chinese national standard) and equivalent international specifications (e.g., ASTM A36, EN S235JR for Q235):​

Q195: Minimum yield strength of 195 MPa, excellent formability and weldability, ideal for light-duty structures, brackets, and non-critical load applications where ease of bending and cutting is prioritized.​

Q215: Yield strength ≥215 MPa, enhanced tensile strength (335-470 MPa) compared to Q195, suitable for medium-light structural frameworks, bracing, and general fabrication requiring balanced ductility and strength.​

Q235: The most widely used grade with yield strength ≥235 MPa, superior toughness, and outstanding weldability/processability. It serves as the benchmark for general structural purposes, from building frames to machinery bases.​

Q255: Yield strength ≥255 MPa, higher tensile strength (410-550 MPa) and rigidity, designed for heavy-duty brackets, load-bearing supports, and structures subjected to moderate dynamic loads.​

Q275: Premium grade with yield strength ≥275 MPa, exceptional tensile performance (490-630 MPa) and wear resistance, suitable for high-stress applications such as industrial crane components, bridge reinforcements, and heavy machinery frames.​

All grades feature a refined grain structure achieved through precision hot-rolling, eliminating internal defects and ensuring consistent mechanical performance across the entire profile length.​

Dimensional Specifications & Structural Advantages​

The angle steel series is offered in four popular equal-leg sizes-40×40mm, 45×45mm, 50×50mm, and 56×56mm-with leg thicknesses ranging from 3mm to 10mm (custom thicknesses available upon request) and standard lengths of 6m, 9m, or 12m (custom cutting supported). The equal-leg design ensures symmetrical load distribution, making them ideal for:​

Forming rigid frames and trusses when paired with other structural steel components.​

Providing lateral support and bracing in building walls, roofs, and floors.​

Reinforcing concrete structures (e.g., beam-column joints, slab edges) to enhance tensile strength.​

Fabricating machine bases, equipment frames, and transportation components (e.g., trailer undercarriages).​

The hot-rolled surface finish retains a natural mill scale, which promotes strong adhesion for subsequent corrosion protection treatments (e.g., hot-dip galvanization, painting, or powder coating), extending service life in both indoor and outdoor environments. Additionally, the L-shaped cross-section delivers an optimal strength-to-weight ratio, minimizing material consumption while maximizing structural integrity-contributing to cost-effective and sustainable engineering solutions.​

Fabrication & Application Versatility​

These angle steels are engineered for seamless integration into diverse manufacturing processes. Their excellent weldability allows for secure joining via arc welding, gas welding, or resistance welding, while their ductility supports bending, punching, and drilling without compromising structural integrity. This versatility enables their deployment across multiple industries:​

Construction: Steel-framed buildings, bridges, scaffolding, and prefabricated structures.​

Industrial Manufacturing: Machinery frames, conveyor systems, storage racks, and production line supports.​

Infrastructure: Highway guardrails, railway sleepers, and water treatment plant structures.​

Transportation: Shipbuilding, trailer manufacturing, and automotive chassis components.​

Quality Assurance & Compliance​

Every batch of Q195-Q275 angle steel undergoes stringent quality control protocols, including chemical composition analysis (via spectrometry), mechanical property testing (tensile, yield, elongation), dimensional accuracy verification (using precision calipers and laser measuring tools), and surface defect inspection. Compliance with international structural steel standards ensures consistency, reliability, and compatibility with global construction codes, making these angle steels a trusted choice for critical and non-critical structural applications alike.