ASTM A36 Ss400 Q235 Ms Carbon Equal and Unequal Angle Steel

This product line covers a comprehensive range of high-quality mild steel (MS) carbon angle bars, meticulously engineered to meet global structural and fabrication demands, available in three internationally recognized core grades-ASTM A36, SS400, and Q235. Distinguished by its dual structural designs, the series includes both Equal Angle Steel (with symmetrical, identical leg lengths) and Unequal Angle Steel (with distinct leg dimensions), offering unparalleled versatility for diverse industrial, construction, and machinery applications. As fundamental hot-rolled structural section steel, these angle bars combine stable mechanical properties, precise dimensional accuracy, superior processability, and cost-efficiency, adhering to strict international standards to deliver reliable load-bearing performance and long-term durability for projects of all scales.

Core Material Grades & Mechanical Performance

All angle bars in this series are fabricated from high-purity mild carbon steel (MS), with three mainstream grades that cater to different load-bearing requirements and regional standard compliance, ensuring consistent quality and adaptability across global markets.

1. ASTM A36 Carbon Steel Angle Bars

ASTM A36 is a globally ubiquitous mild carbon structural steel grade, complying with ASTM International standards, widely adopted in American and international construction industries. It features a minimum yield strength of 250 MPa and a tensile strength range of 400-550 MPa, balancing exceptional ductility, toughness, and processability. This grade requires no complex pre-heat or post-weld heat treatment under normal application conditions, exhibiting excellent compatibility with all standard welding, cutting, and bending processes. ASTM A36 angle bars are ideal for versatile structural uses, from general support brackets to main framework components, fully meeting international quality and safety standards for structural steel.

2. SS400 Carbon Steel Angle Bars

SS400 is a standard general-purpose carbon structural steel grade, complying with Japanese Industrial Standards (JIS G3101), where "SS" denotes Steel Structure and 400 indicates a minimum tensile strength of 400 MPa. With moderate carbon content, SS400 offers balanced mechanical properties, including good ductility, plasticity, and weldability, making it suitable for a wide range of light to medium-duty structural applications. This grade features a uniform internal microstructure, free from porosity and inclusions, ensuring consistent batch-to-batch performance and reliable structural stability, making it a cost-effective choice for routine fabrication and construction projects.

3. Q235 Carbon Steel Angle Bars

Q235 is a classic general-purpose mild carbon structural steel grade, widely used in global civil and industrial construction. The letter "Q" denotes yield strength, with 235 representing a minimum yield strength of 235 MPa, providing reliable load-bearing capacity for light to medium-duty applications. Characterized by low carbon content, Q235 exhibits excellent processability, including superior weldability, cuttability, and formability, requiring no complex heat treatment for routine use. It is the optimal choice for cost-sensitive projects, such as auxiliary structures, support brackets, and general framework components, without compromising basic structural integrity.

Equal & Unequal Angle Steel: Design & Specifications

Our product line offers two core structural designs, each tailored to specific application scenarios, with strict dimensional control to meet international tolerance standards, ensuring compatibility with diverse project designs.

1. Equal Angle Steel

Equal Angle Steel features a symmetrical 90-degree L-shaped cross-section, with identical leg lengths and uniform thickness across both legs. This design ensures even stress distribution during application, effectively preventing stress concentration and enhancing overall structural stability. Available in a comprehensive range of standard leg length and thickness specifications, equal angle steel is ideal for symmetric load-bearing scenarios, such as building frameworks, roof trusses, and balanced support structures, where uniform strength and dimensional consistency are critical.

2. Unequal Angle Steel

Unequal Angle Steel is engineered with a 90-degree L-shaped cross-section, featuring two distinct leg lengths (one longer, one shorter) and uniform thickness. This asymmetrical design is specifically tailored for uneven load-bearing scenarios, where one side requires greater strength or support area than the other. It provides flexible structural solutions for applications such as beam connections, column supports, and irregular framework structures, optimizing material efficiency while ensuring reliable load-bearing performance. The leg length and thickness of unequal angle steel are strictly controlled to meet project-specific requirements, with a wide range of specifications available for customization.

Production Process & Product Features

All ASTM A36, SS400, and Q235 angle bars-both equal and unequal-are manufactured via advanced hot-rolling (HR) technology, using high-quality continuous-cast mild steel billets that undergo rigorous raw material inspection to ensure purity and quality. The multi-pass hot-rolling process precisely shapes the billets into the desired L-shaped cross-section (equal or unequal), followed by controlled cooling and high-precision straightening to maintain perfect flatness, verticality, and dimensional consistency.

The finished products feature a smooth, clean surface with minimal oxide scale, free from visible cracks, scratches, or mechanical damages, and a uniform cross-section throughout the entire length. As mild steel (MS) angle bars, they exhibit exceptional processability, supporting conventional processing methods such as arc welding, gas cutting, cold bending, and drilling, which greatly simplifies on-site fabrication and installation. The hot-rolled manufacturing process enhances the material's toughness and ductility, ensuring it can withstand bending, shear, and compressive forces without deformation or fracture.

Key Product Advantages

Multi-Grade Versatility: ASTM A36, SS400, and Q235 grades cover light, medium, and heavy-duty load requirements, compatible with global standards and diverse regional project specifications, providing flexible material choices.

Dual Structural Designs: Equal and unequal angle steel options cater to symmetric and asymmetric load-bearing scenarios, respectively, expanding application scope and optimizing structural efficiency.

Superior Processability: Excellent weldability, cuttability, and bendability support efficient on-site processing and installation, reducing construction and fabrication time and labor costs.

Strict Dimensional Accuracy: Precise control over leg length, thickness, and 90-degree right-angle precision ensures consistent performance and seamless compatibility with project designs.

High-Quality Mild Steel Construction: Dense internal structure, stable mechanical properties, and long-term durability, meeting the rigorous requirements of structural engineering and fabrication.

Cost-Effective Performance: Mild carbon steel material offers optimal cost-performance ratio, with competitive pricing for bulk orders, suitable for large-scale projects and long-term procurement.

Main Application Scenarios

This series of ASTM A36, SS400, Q235 MS carbon equal and unequal angle steel is extensively applied in industrial, construction, and manufacturing fields. Equal angle steel is widely used in building frameworks, roof trusses, wall brackets, storage shelves, and balanced support structures. Unequal angle steel is preferred for beam connections, column supports, irregular framework structures, pipeline supports, and machinery bases. Specific applications include industrial workshops, commercial buildings, warehouse constructions, bridge auxiliary facilities, transmission tower components, mechanical equipment fabrication, and general hardware manufacturing. With its versatile designs, multi-grade options, and reliable quality, this product line serves as an indispensable structural material for global engineering and fabrication projects.