Date: 2025/6/18
Category: Metallurgical encyclopedia terms
Views: 430
This layout configuration is a relatively popular form of the early universal rolling method for rails. Many similar production lines in Japan, Germany, France, and the United States adopt this layout configuration. The Yawata Works in Japan and the Pansteel Rail and Beam Plant in China have also selected this layout configuration.
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The main rolling line consists of 2 roughing mills, 1 universal roughing edger, 1 universal intermediate edger, and 1 universal finishing mill. As shown in Figure 2, the continuous cast rectangular billets are rolled into rail profiles by BD1 and BD2 roughing mills. The profiles are then sent to the universal roughing mill and edger for 3 passes, followed by the universal intermediate mill and edger for 1 pass, and finally the universal finishing mill for 1 pass to produce finished rail sections.
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This layout ensures that each universal rolling mill group does not form a continuous rolling process, thus avoiding product dimension fluctuations caused by inter-frame tension.
However, this layout has the following disadvantages compared to the newly developed 2+3 layout by SMS:
（1）An additional universal mill and edger are added, increasing the equipment weight by approximately 185 tons and the motor drive power by 3,500 kW.
（2）The main plant length increases by about 257 meters.
（3）The increased distance from heating to the finishing mill raises the likelihood of temperature reduction in the workpiece.
（4）Initial investment and production operating costs increase (higher heating temperature, increased energy consumption, additional 2 mills, increased spare parts and consumption for rolls and guiding devices).
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