The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

LMM GROUP main products focus on the cold and hot plate & wide strip mill rolls and heavy section mill rolls and big casting & forging pieces.

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Answers to questions in the production of six-high reversing mills, cold rolling technology


1. How to control the rolling force?

The rolling force is large, the shape of the plate is difficult to control, the temperature of the roll is uneven, and the bearing capacity of the roll is reduced. Newly replaced work rolls generally use a large tension to reduce the rolling force, which can be reduced after rolling 2-3 rolls.

Relatively speaking, the rolling force is too small and the thickness is difficult to control. The resistance of the tension roll can be reduced and the rolling force can be increased relatively.

2. How to control thickness fluctuation?

Large thickness fluctuations occur in the rolling process. First, reduce the speed and reduce the tension difference. If the thickness fluctuations are large, the monitoring can be canceled.

For thickness fluctuations within 20ym, the speed should be below 500 meters, and the fluctuations above 20ym and the speed below 300 meters.

3. How is the cracked edge caused?

1. The roughness of the edge of the roll is low.

2. There is a color difference on the edge of the strip.

3. The total deformation is too high, and the final pass reduction is too large, which may cause edge cracks after rolling.

4. The raw materials are bulging and cracking.

5. Pickling and trimming are not good.

4. How to control the cracked edge and the broken belt?

When the cracked edge is serious, reduce the bending force of the work roll, reduce the rolling speed, and reduce the exit tension. The tension on the edge of the strip is reduced, and the cracked edge will not be pulled off. If it is found that the edge of the strip is bulging, replace the work roll in time.

5. During the rolling process, what is the reason for the deviation of the belt outline? How to deal with it?

During the rolling process, the deviation of the strip generally occurs when the strip is worn or the tail is flicked. The main reasons for the deviation of the strip are as follows:

1. Due to the incoming material, the shape of the incoming material is not good, and there are serious side waves or wrong sides, so that the centering device of the uncoiler cannot be adjusted accurately and timely, resulting in the deviation of the strip in the first pass. The measures to be taken are: The rolling speed should not be too high, adjust the position of the reduction side in time or stop in time.

2. Operation reasons Due to the unreasonable adjustment of the swing by the operation pressure, the strip steel runs off.

3. Electrical reasons Due to the sudden reduction or disappearance of the coiler tension during the rolling process, the strip runs off and the strip is broken.

4. Due to the serious taper of the roll after grinding, it is difficult to find the pressing, which increases the difficulty of operating the pressing and swinging during the rolling. Broken belt.

5. The failure of the unwinding centering device, the pollution of the lamp tube or the receiving device, etc., make the deviation device fail and cause the first deviation.

Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.

Always a pre-production sample before mass production;
Always final Inspection before shipment;
During the epidemic, provide remote detection technical support

Tell us a little about your application and we’ll get back to you to finalize a quotation to meet your needs as quickly as possible.

Rolling mill rolls product

Classification by roll material:

Cast iron mill rolls

  • Alloy indefinite chilled cast iron rolls
  • Alloy chilled cast iron rolls
  • Alloy SG ductile cast iron roll
  • Pearlitic ductile cast iron roll
  • Bainite ductile cast iron roll
  • Centrifugal cast iron roll

Cast steel mill rolls   

  • Alloy cast steel rolls
  • Semi-steel roller
  • Graphite steel rolls
  • High-chromium steel roll
  • High-speed steel roll

Forging mill rolls

Sort by position on the rolling mill:

Work rolls
backup rolls

Intermediate roll

Product advantage

The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

LMM high-speed steel rolls have higher steel passing per groove (times) due to their good wear resistance, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, and improve the overall efficiency of the factory.
Generally, the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls.

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