Most of the heat treatment of steel needs to be heated to obtain austenite, and then cooled at different speeds to transform austenite into different microstructures to obtain different properties of steel. Therefore, to master the heat treatment law, we must first study the change of steel during heating.

Steel of various geometric cross-sections rolled by heated steel billets.

Cold drawing section steel is a kind of steel with various cross section shapes and sizes which is produced by cold drawing.

Rolling materials often produce various shape defects during the rolling process or during subsequent cooling and transportation, such as bending of bars, profiles and pipes, bending of sheets and strips, waves, bucks, and the like.Through various straightening processes, defects such as bending and so on can be eliminated under the action of external force, making the product can be qualified.

 Dimensions, chemical composition, mechanical properties, hardness
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After the test is passed, thSe steel is put into storage.Rolling processRoller rectification process