High Quality Q355 Q235 Mild Steel Iron Hot Rolled 200*200*25 Equal Angle Steel

High Quality Q355 Q235 Mild Steel Iron Hot Rolled 200*200*25 Equal Angle Steel is a premium heavy-duty structural steel product, engineered with a standardized 200mm×200mm equal leg cross-section and 25mm uniform thickness. Crafted from high-purity mild steel (MS) iron, this hot-rolled equal angle steel integrates the grade-specific mechanical properties of Q355 and Q235-two widely recognized Chinese national standard steel grades-delivering exceptional load-bearing capacity, structural rigidity, and long-term durability. Specifically designed for heavy-duty industrial and construction applications that demand superior strength and stability, it adheres to strict national standards (GB/T 700-2006 for Q235; GB/T 1591-2018 for Q355) and advanced hot-rolling manufacturing processes, making it an indispensable component in large-scale structural projects.

As a high-quality mild steel iron product, its core advantage lies in the controlled low-carbon composition (ranging from 0.12% to 0.28% across the two grades), which balances superior strength with excellent workability-critical for heavy-duty structural components. The mild steel matrix endows the angle steel with good ductility and toughness, enabling it to withstand high static loads, minor dynamic stresses, and temperature fluctuations without deformation or fracture. Additionally, it exhibits reliable weldability, compatible with common welding methods such as arc welding, gas welding, and submerged arc welding, allowing seamless integration with other steel components (e.g., heavy beams, columns, and foundation structures) in complex structural systems, even without pre-heating treatments for most on-site fabrication scenarios.

The product is available in two key Chinese national standard grades-Q355 and Q235-each tailored to meet the distinct strength requirements of heavy-duty structural applications, ensuring versatility and adaptability to diverse project needs:

Q235: A widely adopted mild carbon structural steel grade, renowned for its balanced performance, affordability, and reliability. It features a minimum yield strength of 235 MPa, a tensile strength range of 375–500 MPa, and a minimum elongation of 26%. With a carbon content of ≤0.22%, Q235 ensures excellent formability and weldability, making it suitable for heavy-duty auxiliary structural components such as large-scale bracing, support brackets, and secondary framing in industrial plants and high-rise building foundations.

Q355: A low-alloy high-strength steel grade, offering enhanced load-bearing capacity and fatigue resistance compared to Q235. It boasts a minimum yield strength of 355 MPa, a tensile strength range of 470–630 MPa, and improved toughness (tested at 20°C). The addition of trace alloying elements (manganese, silicon, and vanadium) refines its grain structure, enabling it to withstand extreme heavy loads and harsh working conditions. Q355 is ideal for core structural components such as main framing of large industrial buildings, bridge piers, crane supports, and heavy equipment bases, where structural integrity and long-term durability are paramount.

The defining feature of this product is its standardized 200*200*25mm equal leg dimension-one of the heavier specifications in equal angle steel. The 200mm equal legs ensure balanced load distribution across both perpendicular directions, while the 25mm thick wall provides exceptional structural rigidity and load-bearing capacity, capable of supporting massive static loads in large-scale construction and industrial projects. This thick-walled design also enhances the product's resistance to bending and deformation, ensuring long-term structural stability even under continuous stress.

Manufactured via advanced hot-rolling technology, this high-quality equal angle steel undergoes a rigorous production process to ensure precision and consistency. Raw mild steel iron billets (conforming to Q355 and Q235 chemical specifications) are first subjected to strict pre-inspection to verify purity, composition, and absence of impurities. The billets are then heated to a controlled high temperature (1100°C–1250°C) to maximize plasticity, eliminating brittleness and enabling seamless shaping. Subsequently, the heated billets are passed through a series of calibrated heavy-duty rolling mills, which precisely form the 200*200*25mm equal L-shaped cross-section, ensuring uniform thickness, tight dimensional tolerances (±0.5mm for leg length and ±0.3mm for thickness), and a refined grain structure. This hot-rolling process further enhances the material's mechanical properties, making it more robust and durable than cold-rolled alternatives.

To extend its service life in harsh environments (e.g., outdoor heavy infrastructure, industrial zones, or humid areas), this mild steel iron angle steel can be equipped with optional surface treatments. Hot-dip galvanizing, anti-corrosive painting, or powder coating forms a protective barrier against moisture, rust, and industrial pollutants, preventing corrosion and reducing long-term maintenance costs-critical for large-scale projects where maintenance is difficult and costly.

Rigorous quality control measures are implemented throughout the entire production and inspection process to uphold the "high-quality" commitment. Each batch undergoes comprehensive testing, including chemical composition analysis (to verify Q355 and Q235 grade compliance), mechanical property evaluation (yield strength, tensile strength, elongation, and impact toughness), dimensional accuracy checks, and surface quality assessments. Defects such as cracks, inclusions, uneven thickness, and surface scratches are strictly eliminated, ensuring every piece meets or exceeds national standards and the strict quality requirements of heavy-duty structural projects.

In summary, High Quality Q355 Q235 Mild Steel Iron Hot Rolled 200*200*25 Equal Angle Steel is a specialized heavy-duty structural material engineered for large-scale construction and industrial applications. Its 200*200*25mm thick-walled equal leg design, grade-specific mechanical properties, advanced hot-rolling technology, and high-purity mild steel composition deliver exceptional strength, rigidity, and workability. Backed by strict quality control and compliance with national standards, it is the trusted choice for engineers, contractors, and manufacturers seeking a reliable, durable solution for core and auxiliary heavy-duty structural components.