The normalizing technology of s235j0

A36 is American Standard ASTM material, SS400 is Japanese Standard JIS g3101 steel material for general structure, Q235 is Chinese standard GB700 material. The limitation of the content of the Mn element differs depending on the thickness of the A36 steel plate, and the A36 steel plate of 20 mm or less does not contain Mn. The s235j0, Q235 steel plate has requirements for the contents of C, Si, Mn, S, P and other elements. But SS400 steel plate only requires S and P to be less than 0.050, and no other element requirements.

Another big difference between the two steel plates is the difference in surface conditions. The surface of the s235j0 cold-rolled steel sheet is processed very delicately in the form of matt finish rolling (pear skin processing) and bright finish rolling due to the cooperation of cold rolling and quenched and tempered rolling. The surface of the hot-rolled steel sheet used in ordinary processing is in the state of pickling the oxide scale generated during hot rolling, so it is rough and does not have the uniform state of the s235j0 cold-rolled steel sheet.

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s235j0, Hot-rolled steel coils are made of steel billets, which are made into strip steel by the rough rolling mill and the finishing mill after heating. The hr steel strip from the rolling mill behind the finishing rolling is cooled to a set temperature by laminar flow, and then coiled into a steel coil by the coiler. The cooled steel coil will undergo different processes according to the different needs of users, and is processed into steel plates, flat coils and slit steel strip products.