Hot rolled Q195 and Q345 equal carbon steel angle is a high-quality structural steel profile characterized by its symmetrical equal-sided L-shaped cross-section, reliable mechanical properties, and excellent processability. As a widely used carbon steel product, it is specifically engineered for various structural and industrial applications, manufactured through mature hot-rolling technology and strict adherence to Chinese national standards (GB/T 700 for Q195 and GB/T 1591 for Q345). Produced from high-purity carbon steel billets, this equal angle steel ensures consistent quality, stable performance, and cost-efficiency, making it an indispensable material in construction, machinery manufacturing, infrastructure, and other related fields.
The equal carbon steel angle features a classic and practical structural design, with two identical-length legs (flanges) connected at a precise 90-degree right angle. This symmetrical structure enables uniform force distribution, excellent load-bearing capacity, and strong resistance to bending, torsional, and shear forces-key advantages that make it suitable for serving as core components in structural frameworks, supports, and connections. The equal-sided design also simplifies on-site installation and assembly, allowing for flexible combination with other structural steel products to meet diverse project requirements.
The production process of this angle steel adopts advanced hot-rolling technology, a critical procedure that determines its superior performance. Carbon steel billets are first heated to temperatures above the recrystallization point (typically 800-1050℃), which softens the material while maintaining its structural integrity. The heated billets are then passed through precision rolling mills to be shaped into the standard equal-sided L-shape, followed by natural cooling to room temperature. This hot-rolling process refines the internal grain structure of the steel, eliminating internal defects such as porosity and segregation, thereby enhancing the material's ductility, toughness, and dimensional accuracy. The finished product boasts a smooth surface finish, tight dimensional tolerances, and consistent thickness, ensuring compatibility with subsequent processing such as cutting, bending, welding, and drilling.
Q195 and Q345 are two core carbon steel grades of this equal angle steel, each with distinct chemical compositions and mechanical properties, tailored to adapt to different load requirements and application scenarios while maintaining excellent cost-performance ratios.
Q195 is a low-carbon mild steel grade, compliant with GB/T 700 standards. It has a minimum yield strength of 195MPa and a tensile strength range of 315-430MPa, with a maximum carbon content of 0.12%. This grade is characterized by ultra-low strength, excellent formability, and superior weldability, as well as lightweight and low production costs. Q195 equal carbon steel angle is mainly used in light-duty structural applications, such as small brackets, guardrails, light steel frames for non-load-bearing structures, auxiliary components in machinery and equipment, and other scenarios that do not require high load-bearing capacity.
Q345 (equivalent to Q355 in updated Chinese national standards) is a low-alloy high-strength carbon steel grade, adhering to GB/T 1591 standards. It has a minimum yield strength of 345MPa and a tensile strength range of 470-630MPa, with a moderate carbon content and trace alloying elements that significantly enhance its strength and toughness. Compared with Q195, Q345 has much higher load-bearing capacity and structural stability, while still maintaining good ductility and weldability. Q345 equal carbon steel angle is ideal for medium to heavy-duty structural applications, including building frames, load-bearing brackets, beam supports, engineering machinery bases, infrastructure reinforcement, and other scenarios that require high strength and reliability.
Both Q195 and Q345 equal carbon steel angles have strictly controlled harmful impurities, with phosphorus content ≤0.045% and sulfur content ≤0.045%. This strict control effectively avoids material brittleness, improves fatigue resistance, and ensures long-term durability in harsh operating environments, including outdoor, humid, and industrial settings. The carbon steel base material exhibits good corrosion resistance in normal atmospheric conditions; for applications in corrosive environments, it can be further treated with galvanization, painting, or other anti-corrosion processes to extend its service life.
With its rational structural design, advanced production technology, and two versatile steel grades, the hot rolled Q195, Q345 equal carbon steel angle meets the diverse needs of global customers. It combines reliability, processability, and cost-efficiency, providing a practical and economical structural solution for various projects. Whether for light-duty auxiliary components or heavy-duty load-bearing structures, this equal carbon steel angle delivers stable performance and long service life, making it a preferred choice in the carbon steel structural material market.
