1. Melting and casting
Smelting: Workers put the raw materials of the cold finished square bar into an electric furnace or converter for smelting. By controlling the melting temperature and melting time, our factory can ensure the uniformity of the molten steel composition.
Casting: Pour molten steel into the mold, which is cooled and solidified to form a billet. In the casting process, the factory should strictly control the pouring temperature and cooling rate to obtain good billet organization.
2. Hot rolling and billet
Heating: the cast billet is heated in a heating furnace to reach the temperature required for hot rolling.
Hot rolling: Workers feed the heated billet into the hot mill for rolling. By rolling several times, we can get the blank of the desired shape and size. In the process of hot rolling, workers need to control the rolling temperature and rolling speed to obtain good rolling effect and product quality.
Blanking: Cutting hot rolled steel to form square bar blanks suitable for cold working.
3. Cold working and finishing
Cold drawing: the blank after opening is sent to the cold drawing machine for drawing. By gradually reducing the aperture of the die, the square rod gradually reaches the required size and accuracy. In the process of cold drawing, it is necessary to control the drawing speed and lubrication conditions to avoid scratches or cracks on the surface of the square rod.
Cold heading: For some special sizes of square bar, we may need to use the cold heading process. Cold heading is to put the square bar blank into the die and deform it by stamping to achieve the desired shape and size.
Finishing: Finish the square bar after cold processing, including removing surface oxide scale, grinding surface defects, straightening and other steps to ensure the surface quality and dimensional accuracy of the square bar.
4. Heat treatment
Annealing: Workers put the square bar after cold processing into the annealing furnace for annealing treatment. This step can eliminate the internal stress generated during cold working and improve the plasticity of the material.
Quenching and tempering: For square bars that need to increase hardness and strength, IBC Group can perform tempering treatment. Quenching is to heat the square bar to the austenitic zone and then quickly cool it to obtain martensitic structure. Tempering is to heat the quenched square rod to a certain temperature and keep it warm for a period of time to eliminate the quenching stress and improve the toughness of the material.
5. Inspection and packaging
Inspection: Conduct comprehensive inspection on the manufactured 1018 cold finished square bar, including chemical composition analysis, mechanical property testing, surface quality inspection and other steps to ensure that the product quality meets relevant standards and customer requirements.
Packing: IBC Group will pack the square rods that pass the inspection. We usually use rust-proof paper, plastic film or wooden cases for packaging to prevent damage or corrosion during transportation and storage.
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