AGC technology to control thickness of s235jr hot rolled sheet

Optimize the cooling process system of s235jr hot rolled sheet steel plate after rolling. During ACC water cooling, reasonably adjust the upstream and downstream water ratio, clean up the blocked nozzle, and ensure uniform cooling of s235jr hot rolled sheet steel plate as far as possible, reduce abnormal tissue generation and reduce internal stress of steel plate. Ensure reasonable heating temperature and time of billet, ensure sufficient solid solution of Nb, Ti and other elements.

Phosphorus is a very harmful element in s235jr hot rolled sheet steel. With the increase of phosphorus content, the strength, flexion ratio and hardness of s235jr hot rolled sheet steel increased, but the plasticity and toughness decreased significantly. In particular, the lower the temperature, the greater the impact on plasticity and toughness, increase the cold brittleness of steel.

The s235jr hot rolled sheet steel making furnace can only be used as primary refining, and the refining needs to be completed in the refining equipment outside the furnace, which is also called secondary refining. It is mainly through decarburization, desulfuration, denitrification and dephosphorization to improve the cleanness of the steel, to establish a chromium molybdenum low alloy steel with good oxidation resistance and high temperature strength, to remove unwanted harmful impurities from the steel, and to improve the s235jr hot rolled sheet internal quality of the steel.

Available steel plates: carbon structural steel, low-alloy high-strength steel, steel plates for bridges, steel for building structures, steel angles for shipbuilding and offshore platforms, steel sheets for boilers and pressure vessels, s235jr hot rolled sheet steel plates for molds, steel plates and strips for alloy structures, corrosion-resistant steel, wear-resistant steel, pipeline steel for oil and gas transportation.There are more than 300 domestic and foreign steel grades in our supply list.