Angle Steel 40*25*3/4 Ss400 Sm490A Carbon Equal Angle Steel Cheap Prime Quality Angel Iron/ Hot Rolled Angel Steel for Building

This product range specializes in high-quality hot-rolled unequal carbon steel angle bars, meticulously engineered to precise specifications and premium grade standards. Core to this series is the 40×25×3/4mm unequal leg dimension, crafted in two globally renowned structural steel grades: SS400 and SM490A. As a fundamental hot-rolled structural section, our angle steel combines stable mechanical properties, exceptional dimensional accuracy, and cost-effective performance, fully compliant with international industrial standards. Ideal for a broad spectrum of construction and engineering applications, this product delivers reliable load-bearing capacity and long-term durability, serving as a cornerstone material for building frameworks, industrial fabrication, and infrastructure projects worldwide.

Core Material Grades & Mechanical Properties

Our unequal angle steel series is manufactured in two high-performance carbon structural steel grades, each designed to meet distinct load requirements and regional standard compliance, ensuring versatility and reliability across global markets.

1. SS400 Carbon Steel Angle Bars

SS400 is a standard general-purpose carbon structural steel grade conforming to the Japanese Industrial Standards (JIS G3101). The designation "SS" stands for Steel Structure, while 400 indicates a minimum tensile strength of 400 MPa. Characterized by moderate carbon content and a well-balanced chemical composition, SS400 offers excellent ductility, formability, and weldability. It requires no complex heat treatment under normal working conditions, making it highly suitable for light to medium-duty structural applications. This grade features a uniform internal microstructure, free from porosity and inclusions, ensuring consistent batch-to-batch quality and structural stability. It is the optimal, cost-effective choice for general construction, support brackets, and general industrial fabrication.

2. SM490A Carbon Steel Angle Bars

SM490A is a premium high-tensile structural steel grade complying with the Japanese Industrial Standards (JIS G3106). The numerical value 490 denotes a minimum yield strength of 490 MPa, significantly higher than standard mild steel, providing superior load-bearing capacity and structural efficiency. The "A" classification signifies a material with balanced toughness and weldability, qualified for use in welded structures. SM490A is engineered to meet the demands of medium to heavy-duty engineering projects, offering enhanced resistance to dynamic loads and improved overall structural safety. Its refined internal structure, achieved through precise smelting and rolling processes, ensures exceptional reliability and durability for critical construction components.

Fixed Specification: 40×25×3/4mm Unequal Angle Steel

A key highlight of this product line is the standardized 40×25×3/4mm unequal leg specification. This non-symmetrical L-shaped cross-section features one leg of 40mm, another of 25mm, and a uniform thickness of 3/4mm (approximately 19.05mm). This specific dimension is strategically designed to optimize material efficiency in scenarios requiring uneven load distribution or space-restricted assembly. The precise 90-degree angle is strictly controlled during manufacturing to ensure dimensional accuracy, enabling seamless integration into complex structural frameworks. The 40×25×3/4mm size is widely utilized in the construction of light industrial workshops, warehouse structures, electrical enclosures, and general hardware components, offering a practical solution for both design flexibility and cost control.

Production Process & Key Product Features

Our angle steel products are manufactured through advanced industrial hot-rolling technology, utilizing high-purity continuous-cast steel billets as raw materials. The production process encompasses strict smelting control, multi-pass precision rolling, and controlled cooling, followed by high-precision straightening.

Superior Structural Integrity: The hot-rolling process ensures a dense and uniform internal structure, eliminating common defects such as cracks, inclusions, and uneven density, thereby guaranteeing superior load-bearing performance and long-term structural reliability.

Exceptional Dimensional Accuracy: Critical parameters including leg length, thickness, and right-angle precision are meticulously monitored to meet international tolerance standards, ensuring perfect fit and compatibility during on-site installation.

Prime Surface Quality: The finished product features a clean, smooth surface with minimal oxide scale, free from visible cracks or mechanical damage, supporting direct use or subsequent surface treatments such as galvanizing or painting for enhanced corrosion resistance.

Excellent Processability: Both SS400 and SM490A grades exhibit outstanding weldability, cuttability, and bendability, facilitating easy on-site fabrication, drilling, and assembly, thereby reducing construction time and labor costs.

Core Advantages for Building Applications

Dual-Grade Adaptability: SS400 provides cost efficiency for general projects, while SM490A offers high strength for critical load-bearing components, catering to diverse project requirements and budget considerations.

Standardized Specification: The fixed 40×25×3/4mm dimension simplifies inventory management and bulk procurement, ensuring consistent material performance across large-scale projects.

Prime Quality Assurance: Manufactured under strict quality control systems, our angle steel fully complies with international standards, providing reliable quality assurance for structural safety.

Cost-Effective Performance: The combination of high-quality material and efficient production processes delivers an optimal cost-performance ratio, making it an ideal choice for cost-sensitive construction projects.

Main Application Scenarios

This 40×25×3/4mm unequal angle steel, available in SS400 and SM490A grades, is extensively applied across the construction and manufacturing industries. Its primary applications include:

Building Construction: Structural frameworks, roof trusses, wall supports, and interior decoration components.

Industrial Engineering: Light industrial workshop structures, equipment bases, and mechanical parts.

Logistics & Storage: Warehouse shelf frameworks, storage rack supports, and container structures.

Infrastructure: Pipeline supports, cable tray installations, and auxiliary structures for transportation facilities.

General Fabrication: Electrical enclosures, highway guardrails, and various hardware accessories.

The SS400 variant is particularly suited for general structural supports and cost-effective applications, while the SM490A grade is preferred for projects demanding higher strength and safety margins. With its reliable quality, precise specification, and versatile performance, our hot-rolled angle steel stands as an indispensable building material for global engineering and construction projects.