Hot rolled carbon steel bar is widely used in the fields of construction and machinery manufacturing due to its advantages of low cost and high production efficiency. Below, we will introduce its production process.
1. Blank preparation
The first step is to select carbon steel billets, the most common of which are continuous casting billets. The quality of the billets directly affects the quality of Hot rolled carbon steel bar, so it is necessary to ensure that the composition is uniform and there are no defects such as cracks and pores. After the billets are selected, they are cut according to production requirements to obtain the specified size.
2. Heat treatment
The billet is sent into the heating furnace and heated to 1000℃-1250℃. This temperature range can make the carbon steel billet have good plasticity, greatly reduce the deformation resistance during rolling, and avoid cracks in the steel due to low temperature during rolling.
3. Rolling forming
The heated billet enters the rough rolling unit, and through multiple rolling passes, the cross-sectional size of the billet is gradually reduced and initially formed. Subsequently, it enters the finishing rolling unit, where the rolling process parameters are strictly controlled, and the dimensional accuracy and surface quality of the product are precisely adjusted to meet the predetermined specification requirements.
4. Cooling operation
After rolling, the hot rolled carbon steel bar needs to be cooled. Usually, air cooling and water cooling are used. Air cooling has low cost but slow cooling speed; water cooling can quickly reduce the temperature of steel, control the organizational structure of steel, and improve product performance.
5. Finishing
After cooling, the steel needs to be straightened to eliminate the bending deformation caused by uneven cooling and ensure the straightness of the steel. After that, it is cut to length according to the standard or customer requirements to obtain the Hot rolled carbon steel bar of the specified length. Finally, the surface quality of the product is inspected and defective products are eliminated.
6. Packing and storage
Hot rolled carbon steel bar that has passed the inspection will be packaged according to specifications and batches. The packaging materials are mostly moisture-proof paper, plastic film, etc. to prevent the product from rusting and damage during storage and transportation. The packaged products are stored in the warehouse and wait for shipment
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