Steel Flat Bar Specifications：

Hot rolled flat steel is produced by heating steel billets and rolling them through a series of mills to achieve the required thickness and width, typically ranging from 12mm to 200mm in width and 4mm to 30mm in thickness. Cold rolled slit flat steel is manufactured by slitting cold-rolled steel coils into narrow strips, offering superior surface finish, tighter dimensional tolerances, and consistent thickness. This type is generally narrower – typically 5mm to 100mm in width and 0.5mm to 6mm in thickness – making it ideal for precision applications and further processing such as stamping, bending, or welding. Both types are available in various materials including Q195, Q235B, Q355B, SS400, S235JR, ASTM A36, as well as galvanized coils for enhanced corrosion resistance. Standard lengths are 6m or 12m, with custom sizes available upon request.

Our flat steel is manufactured through two distinct production processes to meet different application requirements. For hot rolled flat steel, the process begins with steel billets (typically Q195, Q235B, or Q355B grades) which are heated to approximately 1200°C in a reheating furnace. The heated billets then pass through a series of roughing and finishing rolling mills, where they are gradually reduced in thickness and width to achieve the required dimensions – typically 12mm to 200mm in width and 4mm to 30mm in thickness. After rolling, the flat steel is cooled on a cooling bed, straightened to ensure flatness, and cut to standard lengths (usually 6m or 12m). For cold rolled slit flat steel, the process starts with cold-rolled steel coils which are fed through a slitting line. The coil is unwound, passed through rotary slitting blades that cut it into narrow strips, and then rewound into smaller coils or cut to straight lengths – typically 5mm to 100mm in width and 0.5mm to 6mm in thickness. Both production processes are strictly quality controlled to ensure precise dimensions, consistent mechanical properties, and excellent surface quality.

1.Hot Rolled Steel Flat Bar Processes ↓

2.Steel Coil（Strip） Slitting Process Processes ↓

Our flat steel is carefully packaged to ensure safe delivery to your job site. Flat steel is stacked in bundles according to size and thickness, with each bundle typically weighing 2-3 tons for easy handling and container loading. Wooden strips or steel spacers are placed between each layer to prevent surface scratches and friction damage during transit. High-strength steel strapping is used to secure the bundles tightly, ensuring stability during lifting and transportation. For added protection, the bundles are wrapped with waterproof cloth or moisture-proof paper to provide protection against humidity and salt spray during ocean shipping. For cold rolled slit flat steel with its finer surface finish, additional protective measures such as VCI paper or plastic film are applied to prevent surface oxidation and scratches. Clear labels are attached to each bundle indicating product specifications, grade, quantity, and handling instructions. All packaging materials comply with ISPM 15 international standards for export shipments. Container loading is carefully planned to maximize space utilization – a standard 20-foot container can typically load approximately 25-28 tons of flat steel depending on sizes and stacking methods. We also offer customized packaging solutions to meet specific project requirements.

Flat steel is a versatile structural material with a wide range of applications across construction, manufacturing, and industrial sectors. In the construction industry, it is extensively used for structural supports, steel frames, trusses, bracing members, floor beams, stair stringers, and as a reinforcement component in building structures. In the manufacturing sector, flat steel is used for machinery frames, equipment bases, conveyor supports, brackets, and workbenches. In the energy and infrastructure fields, it is widely employed in transmission tower components, solar panel mounting structures, and wind turbine support frames. In transportation and logistics, flat steel is used for truck and trailer frames, container components, and pallet supports. In agriculture, it serves as framework for greenhouse structures, livestock shelters, and fencing systems. For narrow cold rolled slit flat steel, it is particularly suitable for precision stamping, metal forming, cable tray support, electrical conduit brackets, and small hardware components. Additionally, flat steel is an essential material for shipbuilding (hull stiffeners and deck plates), mining equipment, railway fittings, and bridge construction. With its excellent strength, formability, and weldability, flat steel is truly an indispensable material for modern industry and construction.