Hot Rolled Mild Q235 SS400 Steel Angle, including galvanized equal and unequal angle bars, is a versatile and high-reliability structural steel product, engineered with mild carbon steel materials, advanced hot-rolling technology, and professional galvanization treatment. Available in both equal-side and unequal-side L-shaped cross-sections, this angle steel complies with Chinese and Japanese industrial standards, integrating the cost-effectiveness of Q235 and the durability of SS400 mild steel. The galvanization treatment further enhances its corrosion resistance, making it suitable for a wide range of structural, industrial, and construction applications that demand stability, workability, and long service life.
The product is crafted from two high-quality mild carbon steel grades-Q235 and SS400-each with strictly controlled chemical compositions and mechanical properties tailored to diverse application needs. Q235, a Chinese national standard (GB/T 700) mild carbon structural steel, features a carbon content ranging from 0.14% to 0.22%, supplemented by appropriate amounts of manganese and silicon. As a mild steel, it offers excellent ductility and workability, with a minimum yield strength of 235 MPa and a tensile strength range of 370-500 MPa, striking an optimal balance between cost and basic structural performance, making it widely used in general structural scenarios.
SS400, a Japanese industrial standard (JIS G 3101) mild carbon structural steel, is renowned for its stable mechanical properties and durability. With a carbon content of 0.17%-0.23% and manganese content of 0.60%-1.00%, it delivers a minimum yield strength of 245 MPa and a tensile strength range of 400-510 MPa. This mild steel grade exhibits superior toughness and weldability, ensuring reliable performance in both static and dynamic load applications, and is widely recognized in Asian and global markets for its consistent quality.
Advanced hot-rolling technology is the foundation of the product's superior quality. During production, Q235 and SS400 mild steel billets are heated to a high temperature (above 1000°C) to soften the material, then subjected to precision rolling to form either equal-side or unequal-side L-shaped cross-sections. This hot-rolling process refines the internal grain structure of the mild steel, eliminates internal defects such as pores, inclusions, and microcracks, and enhances ductility and toughness. Unlike cold-rolled products, the hot-rolled mild steel angle maintains a uniform structure, ensuring consistent mechanical performance across the entire product, which is critical for structural stability.
Galvanization treatment is a key value-added feature of this steel angle, significantly improving its corrosion resistance and service life. The product undergoes professional hot-dip galvanization (or electro-galvanization) after hot rolling, forming a dense zinc coating on the surface. This zinc coating acts as a protective barrier, isolating the mild steel from moisture, oxygen, and other corrosive substances, effectively preventing rust and corrosion. The galvanized layer is firmly bonded to the steel surface, ensuring durability even in harsh environments such as outdoor, humid, or industrial settings, reducing maintenance costs and extending the product's service life.
The product is available in two core configurations-equal angle bar and unequal angle bar-each designed to meet specific structural requirements. Equal angle bar features a symmetrical L-shaped cross-section with identical leg lengths and uniform thickness, ensuring balanced force distribution, making it ideal for applications such as building frames, roof trusses, scaffolding, and balcony railings. Unequal angle bar has two legs of different lengths with uniform thickness, offering flexible load-bearing capacity, suitable for scenarios where uneven force transmission is required, such as wall brackets, beam supports, and machinery bases.
In terms of specifications, the Hot Rolled Mild Q235 SS400 Steel Angle covers a comprehensive range to accommodate diverse application needs. For equal angle bars, leg lengths range from 20mm to 200mm, with thicknesses spanning 3mm to 25mm. For unequal angle bars, longer leg lengths range from 30mm to 200mm, shorter leg lengths from 20mm to 125mm, and thicknesses from 3mm to 25mm. Standard lengths are 6m, 9m, and 12m, with custom lengths available for bulk orders to cater to project-specific requirements. All specifications comply with relevant national and industrial standards, ensuring dimensional accuracy and compatibility with other structural components.
Due to its excellent performance, diverse configurations, and galvanized protection, this mild steel angle is widely applied across multiple industries. In construction engineering, it is used for building frames, floor joists, wall supports, and temporary scaffolding. In industrial fabrication, it serves as machinery supports, equipment bases, and factory frameworks. In infrastructure projects, it is utilized in bridge bracing, transmission towers, road guardrails, and drainage systems. Additionally, it finds applications in warehousing (shelves, cargo pallets) and civil decoration, demonstrating its versatility and practicality.
Each batch of this galvanized mild steel angle undergoes rigorous quality control procedures to ensure consistent performance and reliability. Quality inspections include chemical composition analysis of Q235 and SS400 materials, mechanical property testing (yield strength, tensile strength, impact toughness), dimensional accuracy verification, and galvanized layer thickness and adhesion testing. This strict quality control ensures that the product meets the high standards required for structural applications, delivering long-term reliability and stability. As a cost-effective, durable, and versatile structural material, it is an indispensable choice for modern engineering projects worldwide.
