The advantages of Fully continuous hot rolling technology over semi-continuous hot rolling technology-1

1.Reduced production costs by 10%-15%
Compared with semi-continuous processing set-up, the production costs of fully continuous processing set-up layout of steel per ton is reduced by 10%-15%, mainly by increasing production, reducing fuel consumption, reducing rolling power consumption, reducing bearing consumption, and improving finished product rate.
2.Production increased by 20% to 30%
Solved the bottleneck problem of long reversible rough rolling and large temperature drop in the semi-continuous rolling processing. The fully continuous rough rolling has a total duration of 45-60 seconds (including the wearing strip), and the rough rolling capacity is larger than the finishing rolling capacity.The annual output of fully continuous rolling can be increased by about 20-30% compared with the semi-continuous rolling. The monthly output of 650-750mm full-rolling strip has exceeded 150,000 tons, the monthly output is up to 160,000 tons, and the maximum daily output is more than 6,000 tons.
3. Product strip quality is greatly improved
The roughing mill also adopts a full hydraulic rolling mill, and the width and thickness of the intermediate billet are accurately controlled and the thickness difference is small.The reduction of the temperature difference between the head and the tail and the optimization of the intermediate blank type make the automatic control of the AGC thickness of the finishing mill more precise, which greatly improves the quality of the finished plate.
4.Coil weight increased by 50%
Due to the large temperature drop of the semi-continuous rolling, the temperature difference between the head and the tail is large, so the long billet cannot be used. The fully continuous rolling solves this problem in one fell swoop, resulting in a significant increase in the finished product volume. Increased from the original 6 m billet to 10-12 m (150-165 mm thick).
5.Vertical coiling + ultra-fast cooling, the world's first cooling process, greatly improving product quality
Horizontal coiler + laminar cooling is a general product cooling solution for strip steel, but horizontal coiling has the disadvantage of high accident rate when coiling thin gauge strips. On the contrary, vertical coiling has great advantages in rolling ultra-thin specifications and production improvement, but the site where the scale transport chain produces iron oxide scale is a key shortcoming that affects product quality. Our company’s first three-forked zone using strip export uses ultra-fast water-cooled production technology and is rapidly being marketed, which greatly improves the quality of vertical coiling products.
6.Secondary iron oxide scale and surface quality comparison
• The rough rolling time of the continuous rolling plan is about 45-60 seconds, and the half-rolling time is about 90-120 seconds.
• Semi-continuous rolling reversible rolling process produces more secondary iron oxide scale and directly rolls to the strip surface, affecting the surface quality of the strip
• There is very little iron oxide produced during the continuous rolling of the continuous rolling, and the surface quality is very good.

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