Carbon steel round bars, also known as plain round bars or round steel, are solid round bars made from carbon structural steel and high-quality carbon steel through processes such as hot rolling, cold drawing, precision drawing, and quenching and tempering. The surface finish is available in three forms: hot-rolled black skin, cold-drawn bright surface, and precision-ground mirror finish. The product materials cover ordinary carbon steel, high-quality carbon steel, and low-alloy structural steel. It boasts stable mechanical properties, excellent machinability, weldability, and forging performance, making it a fundamental and universal raw material for machining, hardware accessories, steel structures, fasteners, and mold auxiliary materials.

Carbon steel square bars, also known as square steel, are solid square-section carbon steel profiles. They are mainly manufactured using processes such as hot rolling, cold drawing, precision drawing, and precision grinding, and are available in three main surface types: hot-rolled black square bars, cold-drawn bright square bars, and precision-ground square bars. The products are manufactured using carbon structural steel, high-quality carbon steel, and low-alloy steel, resulting in regular cross-sections, excellent straightness, and stable dimensional tolerances. They also possess excellent cutting, welding, bending, forging, and heat treatment properties, making them a core raw material for machining, mold manufacturing, steel structures, hardware accessories, and equipment frames.

Carbon steel rectangular bars, also commonly known as rectangular steel, are solid rectangular cross-section carbon steel profiles produced through hot rolling, cold drawing, precision drawing, and precision grinding processes. They are mainly available in three surface finishes: hot-rolled black, cold-drawn bright, and precision ground. The products feature a flat cross-section, precise length and width dimensions, excellent straightness, and good cutting, welding, bending, stamping, and heat treatment properties. They are a common basic raw material for machining, steel structures, molds, hardware accessories, curtain wall supports, and grounding components.

‌Carbon steel flat steel‌ is an alloy steel made of carbon as the main component. It is usually made by hot rolling or cold rolling and has specific mechanical properties and chemical composition. Its cross-section is rectangular with slightly blunt edges, the width is between 12-300mm, and the thickness is between 3-60mm‌
. Carbon steel flat bars are widely used in various structures and projects, such as bridges, buildings, automobile manufacturing, industrial pipelines, etc. In the field of construction, carbon steel flat steel is often used to make steel frames in reinforced concrete structures to improve the seismic performance and wind resistance of buildings‌

Carbon steel hexagonal bars, also known as hexagonal steel, are solid carbon steel profiles with a regular hexagonal cross-section. They are primarily produced using cold-drawing, hot-rolling, and precision grinding processes, and come in three surface finishes: hot-rolled black, cold-drawn bright, and precision ground high-precision. The products are uniformly symmetrical on all six sides, have high dimensional accuracy, and good coaxiality. They also possess excellent cutting, milling, bending, welding, and heat treatment properties, making them a core raw material for manufacturing bolts, nuts, shaft ends, fasteners, mechanical parts, and hardware tools. Their assembly and positioning performance is far superior to that of round or square steel.

Q345 carbon steel bars are low-alloy high-strength structural steel bars, conforming to the GB/T 1591-2008 standard (the new national standard has been upgraded to Q355, but Q345 remains the mainstream grade in the market). "Q" represents yield strength, and 345 indicates a minimum yield strength of 345MPa for thicknesses ≤16mm, significantly higher than that of ordinary Q235 carbon steel. The products include four main cross-sections: round bars, square bars, flat bars, and hexagonal bars, manufactured using hot rolling, cold drawing, and precision grinding processes, and available in three surface finishes: hot-rolled black, cold-drawn bright, and precision ground.

Q235 carbon steel bars are classic ordinary carbon structural steel bars under the national standard GB/T 700, and are currently the most widely used general-purpose steel bars in the industrial field. The "Q" in the grade represents the yield strength; the minimum yield strength is 235MPa when the thickness/diameter is ≤16mm. The product range includes four main cross-sections: round bars, square bars, flat bars (rectangular bars), and hexagonal bars. They are produced using three main processes: hot rolling, cold drawing, and precision grinding, and are available in three surface finishes: hot-rolled black, cold-drawn bright, and precision ground.