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LMM have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time
Brand name: LMM GROUP
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
Customization:
Customized logo(Min. Order 1 piece)
Customized packaging(Min. Order 1 piece)
Graphic customization(Min. Order 1 piece)
Checking report: Material Report、Hardness Report、UT/MT Report、Dimensions checking report、Mechanical Property Test Report
Processing technology: casting, forging
LMM have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time
Manufacture drawing | √ |
Process schedule with ETD date | √ |
QC checking of each process | √ |
Checking report | √ |
Photos &videos of each process | √ |
ISO 9001 certificate | √ |
Warranty Time | √ |
The third party Checking | √ |
Product name:Roll rings for high speed rolling of ribhedl steel bars
Product Advantage: The primary rolingtonnageare 600-2000tons，which is 20-30 times more than that of common tool steelrolls.
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60 days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
Customization:
Customized logo(Min. Order 1 piece)
Customized packaging(Min. Order 1 piece)
Graphic customization(Min. Order 1 piece)
Checking report: Material Report、Hardness Report、UT/MT Report、Dimensions checking report、Mechanical Property Test Report
| Manufacture drawing | √ |
| Process schedule with ETD date | √ |
| QC checking of each process | √ |
| Checking report | √ |
| Photos &videos of each process | √ |
| ISO 9001 certificate | √ |
| Warranty Time | √ |
| The third party Checking | √ |
The cemented carbide composite roll is mainly used on the finishing mill for bar, deformed steel bar and common wire. In this way, we can greatly reduce the frequency of changing groove and roll, thus to reduce the labor intensity and improve the work efficiency. The surface quality and yield shall be improved to a maximrurn degree, which leads to a rernarkable ecornmoic benlefit.
ln accordance with the production line and rolling technology of customers, our products are designed to match one-strand rolling, two-slitting rolling and three-slitting rolling. three-slitting rolling, and four slitting rolling, The cemented carbide composite roll includes K1 finished roller, K2 leder roller,K4 pre-slitting roller.K3 slitting roller with high-speed steel as material. The rolling varieties include wire, bar and deformed steel bar.
HBW05 is a new type of material specially developed by our company for KOCKS rolling mill bar production line. The hardness of the roll surface is HSD84-89, the uniformity of the roll surface hardness: ≤3HSD, the hardness drop/mm: ≤2HSD. The hardness difference of 3 roller rings of the same hole type is less than or equal to 3HSD. Single grinding amount (reduction): ≤1 mm. The material has high wear resistance and impact toughness under thermal load, so the product has high wear resistance and impact toughness, no ring burst phenomenon, and low processing difficulty. Its steel passing capacity can reach 60-80% of the cemented carbide roller ring, the price is less than 50% of the alloy roller ring, and the frequency of slot changing can reach 2 shifts.
It can be seen from the metallographic photos that the metallographic structure of the Cementer carbide roll is much better than other materials in terms of the shape, quantity, size and distribution of carbides, as well as the matrix structure and grain size.
During the use of Cementer carbide roll , under good cooling conditions, a thin and dense oxide film is formed on the surface of the roll body. This uniform, thin and dense oxide film can exist for a long time without falling off, so that the wear resistance of the Cementer carbide roll is significantly improved.
Main chemical composition of the material
composition | C | Si | Mn | P | S | Cr |
Proportion(%) | 1.3-1.6 | 0.3-1.0 | 0.4-1.2 | ≤0.03 | ≤0.03 | 3.75-4.4 |
composition | Ni | Mo | V | W | Nb | Co |
Proportion(%) | 0.5-1.5 | 3.0-6.0 | 3.0-6.0 | 4.0-6.5 | 0.5-1.5 | ≤1.0 |
Product design→ Roll blank design→ Roll blank manufacturing→ Roll blank acceptance→ Annealing→ Rough turning→ Ultrasonic flaw detection→ High temperature quenching→ Low temperature tempering→ Ultrasonic flaw detection→ Finishing→ Ultrasonic flaw detection→ Roll body grinding→ Roll numbering→ Inspection→ Cleaning → Packing → Shipping → Warehousing → Inspection → Use and Maintenance → On-site Communication → Design Improvement.
As can be seen from the flow chart, roll manufacturing forms a closed-loop system from product design, production and manufacturing, use and maintenance, and improved design, and the quality of rolls is constantly improving.
Design specifications and standards for manufacturing, quality control and inspection
The relevant standards of the roller ring are as follows:
Testing regulations:
Before determining the grade of cemented carbide for every stand, we shall have a thorough understand about theirproperties so as to make the correct choice (Please refer to the Product manual).
The sleeve insertion and assmbly of cemented carbide roll rings shall be carried out in accordance with the requirementsof precision. There shall be appropriate space between the roll rings and axle or between the roll rings and sleeve. The fit is neither tight nor loose. You should check whether the roll rings contorms to the technological requirement and cleanthe mounting surface of roll rings, sleeve and axle before the installation. it is prohibited to beat the roll rings with hammeror other hard things while assemblying.
For YGH series medium or weak alkali water of PH>7.2
YGRFor YGR series or PH<7.2 weak acid water of PH>7.2
The content of solid particles in the water<15 milligram/L
lt is inevitable to find the microcrack on the rolling groove. The microcrack will gradually extend, stretch and deepen. The groove shall be repaired immediately while the depth of crack reaching 0.2-0.4mm. Otherwise, the crack will deepen quickly, which leads to a risk of broken roller. The range of normal yield is reguated as follows:
Stands of pre-finishing rolling mill: (3500-4000)tons
1-2 Stands of finishing rolling mill: (1800-2500)tons
3-4 Stands of finishing rolling mith(1800-2500)tons
5-6 Stands of finishing rolling mill: (1500-2000)tons
7-8 Stands of finishing rolling mill: (1500-2000)tons
9-10Stands of finishing rolling mill: (1200-1500)tons减
Stands for reducing diameters: (800-1200)tons
lt is normal to find the microcrack on the rolling groove. The groove shall be repaired immediately while the depth of crack reaching 0.2 mm. lt is necessary to prevent the roller from being broken. While repairing, we must ensure to remove the crack thoroughly. Otherwise, it will bring a potential risk to next rolling.It is difficult and inconvenient to check if the surface is polishing. To ensure the complete remove of microcrack, we can increase the grinding quantity. Under thenormal condition, the repair is controlled in the range of:
Roll rings for stands 9-10 of finishing rolling mill(0.4-0.6)mm
Roll rings for stands 1-8 of finishing roiling mill(0.7-1.2)mm
Roll rings for s~nds of pre-finishing rolling mill(1.2——2.0)mm
What do I need for offering a quote ?
Please offer us 2D or 3D drawings (with material, dimension, tolerance, surface treatment and other technical requirement etc.) ,quantity, application or samples. Then we will quote the best price within 24h.
One of the largest enterprises in China specializing in the production of high-performance high-speed steel roll series products
86(411) 84174804
lmme-business@lmmrolls.com
We can provide special services and differentiated products according to the different working conditions of the rolling mill.
Service Include
Classification by roll material：
Cast iron mill rolls
Cast steel mill rolls
Forging mill rolls
Sort by position on the rolling mill：
Work rolls
backup rolls
Intermediate roll
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.
Founded in 2007, LMM GROUP mainly produces all kinds of metallurgical rolls for various types of steel, bar, high-speed wire and strip hot and cold plate and strip rolling mills.
The company covers an area of 100,000 square meters, including two complete production lines for cast rolls and forged steel rolls, processing workshops, product research and development centers, testing centers, training centers and office buildings and other supporting facilities. The factory environment is very beautiful.
* Inquiry and consulting support.
* Planning layout and Design requires machinery
* Welcome visit our Factory.
* The production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.
* Engineers available to service machinery overseas.
* IN-TIME delivery goods.
* The quality is tracked throughout the process, and the installation and use are guided throughout the process.
* Long-term technical support.
* Stick to the agreement, do not do anything that violates the agreement, stick to the spirit of the contract to the end.
Are You Looking for rolling mill rolls? – contact us to get best plan.