Stainless steel plate manufacturing technology
At an early age, Nisshin steel company in Japan with Sendzimir 20-high cold rolling mill for the first time, made of stainless steel sheet production efficiency greatly improved. From austenitic stainless steel work-hardening properties of the system, the original mill work roll diameter was small, and large reduction can be carried out under the Sendzimir rolling mill, but before and after 1990, Japan domestic steel companies have built a shape control and automation equipment, high speed-12 roll more easily rack-type cold rolling mill. Nippon Steel gold stainless steel using this high level of roller mill, 1992 Kashima making the rolling speed 1000m/min,1993 time manufacturing the speed 1200m/min. The other hand, Sendzimir mill also is upgrading to improve the original Single As-U shape control functions and the development of Double As-U and FSBA (Flexible Shift Backing Assembly), and rack-mount Sendzimir mill now Sendzimir mill at maximum speed 1000m/min also in construction. Cold-rolling technology of rolling oil is also an important factor, in order to manufacture stainless steel surface quality of the unique and beautiful, pure now becoming mainstream. In order to maintain the high gloss, thin oil film must be implemented, but rolling at high speed, once under high pressure, oil film rupture phenomenon, which generates heat that scratches, reduce gloss, and becomes the reason of uneven. To this end, developed a Silicon oils at high temperatures can also ensure the lubrication properties, and resistance to high speed rolling of rolling oil, but if you want to get higher speeds, further improve heat resistance scratching is essential, must develop a cooling effect of rolling oil emulsion.
Nippon Steel gold stainless steel light alone developed the rolling oil emulsion, by controlling the particle size and realized the application of emulsified oil in high gloss stainless steel rolled products rolled under high pressure. Apply this was Nippon Steel rolling oil emulsion metal stainless steel 4CM (No.4 roller mill) 120m/min rolled, as a dedicated reversible stainless steel mill, its rolling speed is higher. The 80 's in a move to strengthen environmental protection and trends in high performance engine, quickly apply stainless steel exhaust system, particularly for processing into complex shape of the exhaust duct, the workability of the material put forward higher requirements. To meet this requirement, in materials development at the same time, to improve the process and reduce costs for the purpose of developed tandem cold rolling mill for steel modified from (with a large diameter work rolls) tandem technology. This tandem process, greatly expanding the application of system of ferritic stainless steel in automobiles. In the process of stainless steel annealing and pickling, annealing is a must. In order to remove the iron oxide scale formed in annealing, requires a great deal of descaling equipment. To this end, increased hot-rolled strip annealing and pickling line (HAP) production capacity when annealing capacity should be expanded, improved heating efficiency, through the use of high grinding brush, improve the ability of mechanical descaling, and increase the length of pickling bath. Also, in the chemical descaling, also hope it will not change the sulfuric acid and mixed acid nitric/hydrofluoric acid the basic structure, high performance iron removal by setting the device to stabilize the pickling, by acid pickling tank produced by forced convection in turbulent flow, spray pickling and used to improve the ability of descaling. New HAP line set space unlimited production capacity up to 1 million t/a. The other hand, large stainless steel manufacturers in Europe and America and to Japan, China stainless steel manufacturers in Asia, led by the high efficiency of the equipment and equipment for production of cold-rolled sheet of continuum. Continuous techniques can be divided into several categories. 1th class was to improve the cold-rolling efficiency and yield with small diameter stainless steel rolling mill for the purpose of serialization, Zhou nan, Nisshin steel steel 1969 tandem Sendzimir mill is his representative. 2nd class on the final annealing and pickling line (FAP) on combination skin pass mill and tension leveler. Japan domestic FAP lines built after 1989 much of it is of this form. Source:http://www.jnsteelpipe.com/
