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

YUAN HUI

YUAN HUI

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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High Line Operation Points- rolling mill area

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Material shape control

1Material shape process parameters:

Rolling Mill

roughing mills

intermediate rolling

pre-finishing mill

finishing mill

Material type of the last flight of the unit(mm)

77.0±0.5

35.5±0.3

Φ6.5

Φ8

Φ10

Φ12

Φ14

Φ16

Control according to technical conditions of finished products

20.2

19.6

19.6

19.0

22.0

20.2

±0.2

 2)Material shape control principles and precautions:

The material type is strictly prohibited from exceeding the tolerance range. The tolerance control of the material type of adjacent flights should be uniform. The rough rolling and pre-finishing rolling should be pressed according to the rolling time as much as possible. The one-time adjustment range of the material type should not be too large, and the rough rolling should not exceed 0.5mm. The intermediate rolling does not exceed 0.3mm, and the pre-finishing rolling does not exceed 0.2mm. When adjusting the finished product size, only the first frame and the finished product frame of the finishing mill can be adjusted.

Finished product allowable maximum speed (m/s)

Specification

Φ6.5

Φ8

Φ10

Φ12

Φ14

Φ16

Speed(m/s)

86.0

76.0

50.0

35.0

29.0

21.0

The principle of speed-up when changing product specifications: under the condition that there is no equipment problem, the production will be carried out at the speed shown in the table after changing the specifications.

Tension and looper control requirements

1Requirements for tension control between units and between units:

The roughing and intermediate rolling mills are rolled according to the micro-tension, and the tension value is minimized. It is advisable that the rolling piece fluctuates slightly after the bite. The pre-finishing looper is set strictly according to the specified set height value, and the adjustment amount of the looper is less than 3%. .

2Quantity, location and parameters of the looper:

loop

1

2

3

4

5

6

7

9

Height of loop(mm)

75

170

70

85

110

185

 

Controlled rolling and controlled cooling system:

temperature control point

 

 

water tank

Tank control parameters or principles

length of the cold section of the head(m)

Length of tail lukewarm section(m)

Into the finishing mill temperature

 

930±20

1#water tank

The 1# water tank is adjusted according to the temperature of the finishing mill. After rolling, the 2# and 3# water tanks are preferably used in the case of ensuring the spinning temperature to ensure fast cooling after rolling.

0

0

Incoming module mill temperature

 

2-4#water tank

0

0

Spinning temperature

 

930±20

5#water tank

0

0

Cooling between finishing mills

On/off

 

 

 

 

Auxiliary equipment control parameters:

1# Flying shear head lead coefficient

45%

2# Flying shear head lead coefficient

10%

1#Flying shear head cutting length

160mm

2# Flying shear head cutting length

300mm

1# Flying shear tail lead coefficient

0

2# Flying shear tail lag coefficient

17%

1#Flying shear tail cutting length

0

2# Flying shear tail cutting length

450mm

3# Flying shear head lead coefficient

1.1%

Pinch roller speed lead factor

 

4%

3#Flying shear head cutting length

600~700mm

Pinch Roller Current Limit

0

Breaking shear lead coefficient

0

Pinch roller holding pressure

1.4MPa

Spinning head speed lead coefficient

2.0%~3.0%

pinch roll gap(off/on)

3.5/5.5

Cloth Roller (RPM)

Pinch Roller Pinch Mode

clip tail

 

Finished technical conditions:

Specification

 

allowable deviation

 

Out of roundness

 

Surface Quality Requirements

tensile strength

 

rate of reduction in area

Decarburized layer

Φ6.5

±0.25

≤0.4

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

Φ8

±0.25

≤0.4

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

Φ10

±0.25

≤0.4

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

Φ12

±0.3

≤0.48

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

Φ14

±0.3

≤0.48

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

Φ16

±0.3

≤0.48

No folds, creasing, stuttering

≤400

≥28

≤1.5%D

 

The key points of roller change, hole and guide control:

1)Replace the rolling groove in strict accordance with the specified rolling tonnage. In principle, the amount of steel passing through the rolling groove shall not be greater than the specified amount of steel passing through. If there are obvious cracks on the surface of the rolling groove, it can be replaced in advance when the block is dropped.

Rough rolling, intermediate rolling, pre-finishing rolling

1#

2#

3#

4#

5#

6#

7#

8#

9#

16000

15000

16000

15000

14000

15000

4000

5000

2500

10#

11#

12#

13#

14#

15#

16#

17#

18#

4500

2000

3500

2000

3000

4500

5000

4500

5000

2) When replacing rolls and grooves, carefully check the shape of the pass, and find that the phenomenon of wrong rolls must be adjusted.

3) When replacing rolls and grooves, carefully check whether the cooling water pipes of the rolling mill are unobstructed.

4)When replacing the guide, it is necessary to reasonably adjust the opening of the guide, the distance between the guide and the roll, and the alignment with the pass.

 

Inspection and control points of semi-finished products and finished products:

1)The dimensions of semi-finished products are measured online with calipers, and the material height of each flight is controlled so that it is within the specified range.

2)The surface quality of the intermediate material should be observed frequently, and if there are scars, ears, etc. on the surface, it should be stopped for inspection and treatment in time.

3) Take the tails of 1# shears, 2# shears and 3# shears every 1 hour for measurement, and accurately control the material size of key sorties.

4) The finished product sampler must check and measure the surface quality and external dimensions one by one, and notify the main console to stop rolling if there is any problem.

Key contents and requirements of daily inspection of rolling area:

1) Check the surface of the rolling groove of each pass, if there is serious cracking or falling blocks, stop and replace it in time.

2)Check the cooling water pipes of each roll to ensure that the cooling water pressure and flow can be correctly sprayed on the rolling groove.

3) Check the running stability of the rolling stock, and notify the main console to adjust the speed in time when the rolling stock fluctuates too much and has a tendency to stack steel.

4) Check the running condition of the rolling guide guard, and notify the main console to stop rolling in time when the guide wheel is stuck, steel falling and other phenomena are found.

 
rolling mill rolls-rolling mill

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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We would be happy to help and advise if you have any questions or inquiries.