Hot-rolled sheets and strips of carbon structural steel and low alloy structural steel are one of the important types of products in the steel industry. It is widely used in various industries such as construction, automobile, electromechanical, shipbuilding, petrochemical and military industry.
Hot-rolled carbon structural steel refers to steel grades Q195, Q215, Q235, Q215B and Q235A which are mainly used in manufacturing plants, general construction, bridges and other construction projects. Low-alloy structural steel refers to steel grades Q255, Q275, Q345, and these are mainly used in manufacturing plants, bridges, ships and other structures.
Hot-rolled sheets and strips of carbon structural steel and low alloy structural steel are strip steel with continuous casting slabs and hot-rolled into strip steel of certain width and thickness. Drawing and stretching are performed by cold-rolling mill equipment, so that the state of the finished product reaches the special requirements.
The hot-rolled sheets and strips of carbon structural steel and low alloy structural steel products specified in GB 912-89 have a thickness range of 1.2-20mm, which can completely meet the customers actual needs. Hot-rolled steel plate and strip products of carbon structural steel and low alloy structural steel specified in GB 912-89 can be divided into general quality, structural quality and carburized quality.
The thickness deviation, width deviation, flatness and straightness of hot-rolled sheets and strips of carbon structural steel and low alloy structural steel specified in GB 912-89 are specified. The thickness deviation should be strictly controlled to meet customers requirements. The allowable maximum errors of thickness deviation depends on the different thickness of the product, and it should also be checked with special tin to ensure the tolerance accuracy.
The surface of the hot-rolled sheets and strips of carbon structural steel and low alloy structural steel specified in GB 912-89 should be smooth and bright, without scratches or scratches. If the surface of the product is not paper-like rust, discoloration, or a small amount of corrosion resistance, it does not meet the standard requirements and cannot be used for product assembly.
The chemical composition of hot-rolled sheets and strips of carbon structural steel and low alloy structural steel specified in GB 912-89 must be strictly checked before delivery. This is to prevent some inferior products from infiltrating into or being mixed with qualified products, thus affecting the quality of the steel. The specifications of the strength and elongation of hot-rolled sheets and strips of carbon structural steel and low alloy structural steel products specified in GB 912-89 are higher than the levels stipulated in the standard. The impact energy of the steel specified in GB 912-89 shall not be lower than the values stipulated in the standard.
In summary, the hot-rolled sheets and strips of carbon structural steel and low alloy structural steel specified in GB 912-89 have superior technical performance and are widely used in industrial production and civilian life. Both users and society will benefit from it.
