This product range covers high-quality mild carbon steel equal angle bars, also widely referred to as steel angle iron, with a core focus on the universally applicable SS400 mild steel grade and customizable perforated processing options, alongside multiple professional surface treatment solutions. As a foundational hot-rolled structural section steel, equal angle iron features a standard 90-degree symmetrical L-shaped cross-section with equal leg lengths and uniform thickness, engineered to deliver stable mechanical properties, exceptional processability and cost-effective performance for diverse industrial, construction and fabrication applications. We offer flexible customization in terms of dimensions, perforation patterns and surface finishes, adhering to strict quality control standards to ensure consistent product performance, dimensional accuracy and long-term durability, catering to the diverse needs of global customers with reliable and affordable structural steel solutions.
Core Material Specification: SS400 Mild Steel
All standard equal angle bars in this product line are manufactured from SS400 mild carbon structural steel, a premium general-purpose grade complying with JIS G3101 industrial standards, renowned for its balanced chemical composition and versatile performance. SS400 mild steel features a moderate carbon content, ensuring optimal softness and ductility, making it highly suitable for secondary processing such as perforation, cutting, bending, drilling and welding. This grade delivers a minimum tensile strength of 400 MPa, offering reliable compressive, bending and shear resistance for light to medium-duty structural applications, with no requirement for complex heat treatment under normal operating conditions. The uniform internal structure of SS400 mild steel eliminates common defects like porosity and inclusions, guaranteeing batch-to-batch consistency and stable quality, positioning it as the most widely used material for general steel angle iron across global markets.
Key Product Variants & Processing Features
1. Standard Mild Steel Equal Angle (Steel Angle Iron)
Our standard equal angle iron is produced via advanced hot-rolling technology, with strict control over leg length, thickness, right-angle precision and overall straightness to meet international dimensional tolerances. This unperforated standard variant is designed for general structural support, framework fabrication and basic engineering applications, offering exceptional versatility and easy on-site processing. It serves as a cost-efficient bulk structural material, ideal for large-scale procurement and routine construction projects, with smooth surface quality and minimal oxide scale for direct use or subsequent surface treatment.
2. SS400 Perforated Angle Steel
We specialize in custom SS400 perforated angle steel, a value-added processed variant tailored for applications requiring convenient installation and modular assembly. Precision perforation is carried out using high-precision punching equipment, with customizable hole diameters, hole spacing and hole patterns (round holes, oval holes, square holes) to meet specific project requirements. The perforation process is executed without damaging the structural integrity of the angle steel, maintaining its original mechanical strength and load-bearing capacity. Perforated angle steel eliminates the need for on-site drilling, significantly reducing construction time and labor costs, making it ideal for pipeline supports, cable trays, storage shelves, electrical engineering brackets and modular steel structures.
Professional Surface Treatment Options
We provide four high-quality surface treatment solutions for our mild steel equal angle and perforated angle steel, catering to different environmental conditions, anti-corrosion requirements and aesthetic needs, all processed under strict quality standards to ensure uniform coating and long-lasting protection:
Oil Surface (Anti-Rust Oil Coated): A cost-effective temporary anti-corrosion treatment, where a thin layer of industrial anti-rust oil is applied to the steel surface to prevent oxidation and rust during transportation and short-term storage. Suitable for indoor applications or projects with immediate installation and subsequent painting.
Black Surface (Black Phosphated / Hot-Rolled Black Finish): Also known as black iron angle, this treatment includes either a natural hot-rolled black oxide finish or a professional phosphating process, enhancing basic anti-corrosion performance and improving surface adhesion for subsequent coating. It offers a sleek, uniform black appearance and moderate rust resistance, ideal for general indoor structural uses.
Galvanized Surface (Hot-Dip Galvanized): A heavy-duty anti-corrosion treatment featuring hot-dip galvanizing technology, which forms a thick, dense zinc coating on the angle steel surface. This treatment provides exceptional long-term corrosion resistance, suitable for outdoor applications, humid environments, coastal areas and underground engineering, with a service life far exceeding ordinary surface treatments.
Painted Surface: Custom industrial paint coating, available in various standard colors and customized paint types, combining anti-corrosion protection with aesthetic appeal. The painted finish offers good weather resistance and scratch resistance, suitable for visible structural components, decorative steel structures and projects with specific color requirements.
Core Product Advantages
Premium SS400 Mild Steel Material: Stable chemical composition, excellent ductility and processability, reliable mechanical strength, fully compliant with international structural steel standards.
Flexible Customization: Wide range of standard dimensions available, with customizable perforation specifications and surface treatments to meet unique project demands.
Multiple Surface Protection: Four professional surface options to adapt to different application environments, effectively extending service life and reducing maintenance costs.
High Dimensional Accuracy: Precision hot-rolling and straightening ensure tight tolerance control, uniform cross-section and straight profile, enabling seamless on-site assembly.
Cost-Effective Performance: Competitive pricing paired with reliable quality, suitable for large-scale bulk procurement and various small to medium-sized projects.
Wide Process Compatibility: Easy to weld, cut, bend and install, supporting efficient construction and fabrication, reducing overall project time and labor input.
Main Application Scenarios
This series of mild steel equal angle iron and SS400 perforated angle steel is extensively applied across construction, machinery manufacturing, electrical engineering, logistics and storage, transportation infrastructure and daily hardware industries. Typical applications include building structural brackets, roof trusses, pipeline and cable supports, storage shelving frameworks, electrical cabinet brackets, transmission tower accessories, engineering machinery supports, decorative steel structures and modular assembly systems. The standard unperforated variant is ideal for general structural frameworks and support components, while perforated angle steel is preferred for modular and prefabricated projects requiring quick installation. Different surface treatments allow the product to adapt to indoor, outdoor, humid and corrosive environments, making it a versatile and indispensable structural steel solution for various industrial and civil engineering projects.
Through strict quality inspection covering raw material selection, production processing, perforation processing and surface treatment, we ensure every piece of steel angle iron meets high-quality standards, delivering consistent performance, durable protection and reliable value for global customers
