Features and Functions of Reduction System in Stainless Steel Plate Production

  In the production process of stainless steel plate, the reduction system is an indispensable process link, which has relevant regulations on rolling passes, reduction amount and rolling process, etc., and should be determined according to the characteristics of the rolling mill, and it should be The variety and size of manufactured products can be adjusted in time. A scientific suppression system can effectively reduce costs and improve quality.

In the actual operation plan, the reduction system is mainly determined according to the pressure of the stainless steel plate on the roll and the load of the main motor. Generally, in the first two passes, the reduction amount is limited by the load of the main motor. In cold rolling production, a large reduction is often specified in the first pass, and the reduction is gradually reduced in each subsequent pass, so as to ensure that the metal-to-roll pressure tends to be consistent in each pass.
  Sometimes to produce work-hardened stainless steel strip or stainless steel strip with minimal warpage and uniform thickness, it is necessary to significantly increase the number of rolling passes. During rolling, the unit pressure and total pressure of the stainless steel plate on the roll cannot be higher than the design standard. In addition, the reduction of each pass and the total reduction of a rolling pass are also affected by the mechanical properties of the rolled strip and its changes during the rolling process.
  In addition, the process lubrication and roll surface roughness in production will also have a relatively high impact on the reduction system. The use of effective process lubrication can increase the overall reduction of a rolling pass to 80% or higher. According to the traditional process, when using No. 20 engine oil, it takes two rolling passes to roll a billet with a thickness of 3 mm to a finished product with a thickness of 0.7 mm. When the thickness of the stainless steel strip is 1.5 mm, intermediate heat treatment is performed, and the total number of passes is 16. The total reduction ratio between the two heat treatments is 50% and 53.3%.
  When a bright oil called 28 is used, it can be rolled in one pass with a total reduction rate of 76.7% under the condition that the number of passes can be reduced to 11. When using polymer cottonseed oil, it can be controlled within 13 passes, with a total reduction rate of 81.6% to roll a large roll billet with a thickness of 3.8mm into a finished stainless steel plate with a thickness of 0.7mm, using such a reduction amount Not only austenitic stainless steel with good plasticity can be rolled, but also austenitic ferritic or austenitic martensitic duplex stainless steel with high deformation difficulty can be rolled. The forced reduction system will further increase the temperature of the stainless steel strip, thereby optimizing the plasticity of the stainless steel strip. In such conditions, although the total reduction will be very large, the phenomenon of edge cracking of the stainless steel strip will not occur during rolling.
  Strengthening reduction is adopted on the multi-roll mill, which can reduce the number of rolling passes and significantly reduce the number of intermediate annealing. Under the condition of maintaining the total reduction rate of 97%, the multi-roll mill with high strength and rigidity can ensure that the relative reduction amount of each pass remains unchanged, so the power of the main motor can be better than other types of rolling mills.