The advantages and disadvantages of hot rolling and cold rolling tube tube

     The square is divided into two major categories of hot and cold, they belong to the type of steel or steel plate. Due to their own conditions for steel organization and performance have great influence, so general square tube rolling are mainly around the hot rolling based, supplemented by cold rolling for production and trumpet type steel or sheet.

   The properties and functions of hot rolling and cold rolling are described below:

   1, hot rolling
   Usually refers to the seamless tube, seamless tube is formed by hot rolling, cold drawing process, generally used for industrial manufacturing.
   Advantages: it can destroy the ingot casting microstructure, grain refinement of steel better and eliminate defects in microstructure. So that the density of a         fusion, but also to improve their performance. However, this improvement is mainly reflected in the rolling process, the formation of bubbles, cracks or loose,     can also be improved in the case of high temperature.

   Shortcomings: (1) after hot rolling tube and steel internal non metal debris will be escorted into thin slices, stratified phenomenon. The emergence of the stratification will lead to the deterioration of the performance of the steel, and will be accompanied by the shrinkage of the weld and lead to tear, tear apart from the impact of the larger than the load caused by the pressure. (2) uneven cooling can cause a residual stress. The general stress are exist in all kinds of hot-rolled steel, steel section bigger its residual stress is bigger, although it can balance, but the performance of steel still have certain effect.

      2, cold rolling
Is that under normal temperature, cold, cold, cold after cold processing of the steel sheet or strip processed into various types of steel.
Advantages: high speed, high output, and no damage to the coating, can be made of a variety of cross section form, in order to meet the needs of the use of conditions; cold rolling can make steel produce a lot of plastic deformation, so as to improve the yield point of steel

      Shortcomings: (1) cold rolling relative specific heat rolling, in the process of forming the lack of hot plastic compression, resulting in section still remnants of spare capacity, regardless of the steel as a whole or the sawn surfaces flexion and extension. (2) hot rolled steel and the formation of smaller wall thickness, in the plate interface to the corner and has nothing to do with the thickness of the treatment, easily lead to huge not load capacity is too weak.

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