Sample supply casters casters casters washing machine are steel or cold-rolled and hot rolled steel plate forming process, their structure and properties of steel have a great impact, important for hot rolled steel mainly used only for consumption cold trumpet and sheet steel. 
 First, the cold 
 Is at room temperature, after cold drawing, cold, cold to cold-drawn steel or steel and other processed into various types of steel. 
 Strengths: forming speed, high output, and does not damage the coating, the situation can be made of a variety of cross-section to accommodate the use of the conditions required; onset of cold-rolled steel to make large plastic deformation, which advances the steel yield point. 
 Disadvantages: 1. Although the molding process has not been hot in plastic shrinkage, but the section still exists within the residual stress, and some buckling of the steel the characteristics of the whole episode will affect; 2. Cold-rolled steel is to tell whether an individual style section, making the lower section of the ease to change the stiffness. Easily emerge when the change in bending, compression bending and torsion when the easy emergence of buckling, torsional performance is poor; 3. Cold formed steel wall thickness smaller plates connected in the corner and no thicker, suffered some of the concentrated load can be weak. 

 Sample supply casters casters casters two washing machines, hot-rolled 
 Strengths: the ability to damage tissue ingot casting, grain refinement of steel, and clear the shortcomings of the microstructure, so that the tissue density of steel, mechanical properties improved. This significant improvement along the rolling direction on the table now, so certainly the level of steel in the body is no longer isotropic; casting formed when bubbles, cracks and fluffy, but also under pressure at low temperature along the welded joint. 
 Disadvantages: 1. After hot rolling, the steel outer non-metallic dopants (sulfides and oxides is important, as well as silicate) is pressed into sheets, the emergence of stratified (laminated) picture. Stratified so that the steel in tension along the thickness direction performance greatly improved, and there can emerge in the contraction of the weld layer tear. Weld shrinkage-induced strain is often some point reach the yield strain of the times, much greater than the load caused by the strain; 2. Uneven cooling the formation of residual stress. Residual stress in the absence of external force autocorrelation balanced external stress, a variety of cross-section of hot-rolled steel have this kind of residual stress, the larger the size of individual beam cross-section, the greater the residual stress. Although the residual stress is self-balanced, but the steel members under loads of performance and have positive effects. Such as deformation, stability, anti-fatigue, etc. are able to attack a negative effect. 

 Third, the difference between cold and hot? 
 1, cold rolled formed steel sections permit the emergence of some of flexion, allowing adequate application of the bar-buckling capacity; and hot-rolled steel sections do not permit attacks part of the buckling. 
 2, hot-rolled steel and cold rolled steel residual stress causes the onset of the different, so the spread of the cross section is also very different. Cold-formed steel sections on the type of residual stress distribution is tortuous, and hot-rolling steel or welded steel sections on the residual stress is distributed in the thin film. 
 3, the hot-rolled steel cold-rolled steel free to change the stiffness ratio is high, so the torsional properties of hot-rolled steel is better than cold-rolled steel. Sample supply casters casters casters washing machine