【正文】 nd mediumsized iron and steel joint enterprises mainly for the opening production of billet and steel medium. Generally as raw materials in steel ingot, billet rolling into, as a system of blooming machine, it has produced thin slab sheet supply roll mill, the small supply pipe Seamless Steel Tube Mill, Billet supply of small steel mill and wire mill, in addition also some mediumsized steel production. Therefore, 650 medium mill in rolling system plays an important role, it plays a steelmaking and rolling the link between role It determines the output of steel production enterprises throughout the decisive link. My Mill such a large number of widely distributed, more plex specifications also sum up, a typical parison of the following categories : 630650 3 types such mill mill for most of Blooming and simple section of the rolling radius of steel, Only individual profiled steel rolling plant more. The main problem for small mills, steel rolling and light, the roll over of these products with the required number of pass. Therefore, we can not use a rolling into a steel ingot, billet must first open (according to different products, first rolling into the fire first section of the 150 mm 150% of the billet, or rectangular beam blank blank) rolled. that is rolling into two, it will not only low yields, and rolling processes to do it twice, which increased consumption of the metal. Moreover, due to less rack, roll groove layout is not ideal, when slot wear without reserve Kong will be forced to change roller, This is a waste of roll, but also affect the rate of mill operations. In addition, the intermediate crop shear difficult layout, and does not help with a heating Ingot. Also, when the three seat by a motor, As the planes roller mill can speed the workpiece with the extended incremental also affected the mill productivity. But such mill equipment and plant investments than twoslightly less (referring to a single drive), being easier to get started, it can satisfy, the management, all types of sheet steel billet production needs. As a medium current Blooming workshops, prefer to use this type of mill can be. If the appropriate conditions for the billet of large and mediumsized iron and steel joint ventures, This mill can be as steel mill for the production of mediumsized steel.650 1/500550 3 mill types such specialized mill Blooming, and it has to e mainly Blank, and part of the steel production. Compared with 630 650 3 1 mill, more a mill, intermediate crop shear can be installed in the series between the two machines, flow more smoothly, and is conducive to a wellused steel ingot. The two machines the main rooms can be located with the main span of the side over a doubledrive mill ventilation conditions are better. When Blank to e mainly, and also to raw materials for steel ingot production of steel to meet the region39。s needs, may choose to use such mill. But with a heating Ingot is a certain limitations, the first intermediate billet not clear, finished surface quality are affected, straightening after more grinding, Test strict。 Some plants even PVexamination, heavy workload. Secondly, the guide accidents, is not easy to control the temperature and the output affected. Certain sections of the steel plex, as workers, channels, such as deformation of the light, pass, Even two four mill did not always implement a heating Ingot. . These issues in the design would have to take into account. Parallel small (steel) mill specifications listed in the main500 2, double500 2 / 350 5, double400X 2 / 300 5, double300 2 / 5 and 250 250 separate5. 5002 type of mill equipment such small mill operators, small investment, and can be used for the local plant Blooming workshop, to play the rest of the small mill capacity, enhance product quality and expand the varieties, improve operation and management conditions. 8 materials to mainly steel ingot, billet or available size of the billet and forging. Its variety of product specifications, meet the 400 / 300 the following types of small mill39。s needs. 500X2 used for the blooming mill, In addition to the production can also highspeed tool steel, mold steel, stainless steel, hightemperature steel than most steel, as supplemented by forging hammer, open to all kinds of steel were produced. products are mainly for 60 39。 12039。 Billet. Using 500 2 steel mill production The drawback is the small steel ingot not rolling out more products (bar diameter general 50 mm), Meanwhile billet surface poor quality, so wellworkshop rear workload. 500 2 / 5 and 350 400 2 / 300 5 types mill are suitable for the local iron and steel plant in use, the independent construction of two 500 / 5 to 8 mill steel ingot for raw materials, more than 400 2 / 300 5 to 6 mill rolling ingot raw materials for the products are of good quality, can be a fire or two fire rolling out a wide range of small steel products, and for other small modities billet mill. If the joint ventures in the steel and use the rolling steel billets, 400 2 / 5 300 500 mill than 2 / 350 5 mill equipment light weight, small investment, and the scale of production and product types are very similar, and in particular the production of alloy steel. Mill than 400/300 500/350 (300) Mill superiority. 400/300 for the rough mill rolling Finishing Mill machines and the roll diameter difference with appropriate, Therefore, the two production capacity and a more balanced load. 300 2 / 250, and 250 5 5 mill type characteristics Workshop is little light equipment, less investment and initiate fast, Product specifications types of nationbuilding generally is urgently needed. 300 2 / 250 5 mill 2 mill diameter difference properly, the economic effect is good and the output is high, rolling varieties suitable for a single Ordinary steel, and a 250 5mill, rolling slower speed, it can produce carbon steel, alloy steel to rolling, more varieties suitabl