technology & solution
LMM GROUP is equipped with advanced equipment and enjoys excellent technology for mechanical and electro-plating processing. It has complete testing devices, perfect production management and strict environmental protection measures. LMM has become a major supplier of cemented carbide roll rings in the world’s steel industry with the efforts of the company’s team.
Tungsten carbide powder + cobalt powder + nickel powder + chromium powder are mixed, pressed and sintered to form, and then the composite carbon steel material is embedded in the inner hole of the cemented carbide rings. The carbon steel material and the cemented carbide rings are tightly combined through a special process.
significantly reduce the procurement costs of steel companies:
Replacing the non-working layer part of the high-priced carbide roll ring with low-priced composite carbon steel material reduces the cost of the steel mill while ensuring various indicators such as product stress and joint surface strength.
reduce the accident rate of cemented carbide roll rings:
Because the materials of the taper sleeve and the carbide roll ring are different, the heat generated by the box during the operation of the equipment is conducted to the roll ring through the taper sleeve. If the cooling is not good, it is very easy to cause transverse cracks. The new material uses a flexible composite layer. The thermal conductivity of the material is higher than that of cemented carbide, which can effectively dissipate the heat transmitted to the roll ring. As a transition layer, it can reduce the probability of transverse cracks of the roll ring.
The dynamic balancing problem of traditional carbide roll rings cannot be fundamentally solved because they are powder metallurgy products, and the dynamic balancing weight fluctuates greatly. Poor dynamic balance will have a great impact on the use and life of the roll box. The composite roll ring can reduce the dynamic balancing weight to less than one gram, and at the same time the weight will be reduced accordingly. This will greatly reduce the load of the roll box, effectively reduce the loss and damage of the roll box, and improve the comprehensive service life of the roll box.
Here are some key points about tungsten carbide rolls:
Composition: Tungsten carbide rolls are made from tungsten carbide (WC) particles cemented together with a metallic binder, typically cobalt. This composition gives them exceptional hardness and wear resistance.
Applications: They are primarily used in rolling mills for shaping and forming metal products. This includes applications in the production of steel, aluminum, and other metal alloys.
Durability: Tungsten carbide rolls have a longer service life compared to traditional steel rolls due to their high hardness and resistance to wear.
Performance: They provide better surface finishes on rolled products and can operate at higher speeds, improving productivity.
Heat Resistance: They can withstand higher temperatures, making them suitable for high-temperature rolling processes.
Types of Rolling:
Hot Rolling: Used for shaping metal at high temperatures.
Cold Rolling: Used for shaping metal at room temperature, providing better surface finish and dimensional accuracy.
Provide value-added, green and intelligent one-stop solutions and services to customers in global steel, metallurgy industries
LMM GROUP overseas warehouses and branches have been successively established in the United States, Switzerland, Mexico, Germany, Turkey and other countries. And our products have been exported to more than 90 countries and regions in the Americas, Europe, Southeast Asia, the Middle East, Africa, and Asia. It has formed strong core competitiveness in the fields of steelmaking, continuous casting, and rolling products, and provides high-end customers with high-quality products and Serve.
Production Process and Production Facilities
Raw material:
The main raw material is tungsten carbide powder. LMM funded 20,000,000.00 USD, and imported the carbide powder manufacture equipment in 2010.
Tungsten carbide powder is produced by APT, and burning in electric heating rotary calcination furnace, and then come into being blue tungsten oxide, then through burning and producing the tungsten powder.
Screened & Classified:
The tungsten powder is screened by a vibrating screen. And then through the air classification equipment, it is classified into different granularity.
Ball Milling & Mixxing:
Tungsten powder in a certain proportion, adding carbon black and other additives after ball milling and mixing.
High Quality TC Powder:
The tungsten powder with good carbon black is added to the intermediate frequency carbonization furnace. In the end, the WC the powder was milled by the ball milling machine, and the high quality tungsten carbide powder was produced.
Forming Powder:
The WC powder, cobalt powder, and other rare elements are formulated in good proportion. Join the ball mill through the 24 hours of wet grinding, and mixed into the forming powder, then put them into the spray drying tower.
Press & Burning:
Compression molding will be prepared and put the powder into the mold, press molding with a hydraulic press; Put the roughcast into the furnace and burn it into the roll roughcast.
Finish Machine:
Through flat grinding, internal hole grinding, and cylindrical grinding comes into being the product of the ring. Also according to different rolling, different rolling mills, processed into wire grooved roll rings, wire thread roll rings, bar combination rolls, and roll steel.
Recommended applications of grades for carbide roll rings
| Grade | Recommended applications |
| LMM08R | Maximum hardness, excellent wear resistance in the series. Used in the last 1~2 stands of good high-speed rolling mills for rolling common and hard steel bars. |
| LMM10R | Higher wear resistance. Mode rate impact resistance in the series. Used in the last 1~2 stands of good high-speed finishing rolling mills for rolling common and hard steel bars. |
| LMM12R | High wear resistance and corrosion resistance. Used in the last 1~4 stands of finishing mills. |
| LMM15R | Moderate wear resistance and impact resistance, good for general purpose. Used in the last 1~4 stands or all stands of finishing mills. |
| LMM18R | Good toughness and thermal crack resistance, good for general purpose. Used in most stands of the finishing mills and the rear stands of common mills. |
| LMM20R | Best for general purposes. Used in the front stands of good rolling mills and in the rear stands of common rolling mills. |
| LMM25R | Used in the first and second stands of finishing rolling mills and in the stands of pre-finishing rolling mills. For every stand of rolling lines for tow speed rolling low precision and unstable operations. |
| LMM30R | Maximum binder content in LMMR series, good toughness and thermal crack resistance. Used in the stands of pre-finishing rolling mills and for rolling rings for hot rolling of ribbed steel. |
| LMM32R | With good toughness and impact resistance, used for bar, deformed bar finish stand rolling. |
| Grade | Recommended applications |
| LMM06H | It possesses the highest hardness and the best wear-resistance among all the varieties of cemented carbide roll rings, thus used for the rolling of common wire and hard wire on the last 1~2 stands of high- speed wire rod finishing mill. |
| LMM08H | It possesses better wear-resistance and moderate impact-resistance with the hardness second to LMM06H among all the varieties, thus used at the last two stands of high-speed wire rod finishing mill. |
| LMM10H | It possesses the moderate wear-resistance and impact resistance, thus used at the last 3~4 stands of high-speed wire rod finishing mills. |
| LMM15H | Moderate wear resistance and impact resistance, good for general purpose. Used in the last 1~4 stands or all stands of finishing mills |
| LMM20H | Best for general purpose. Used in the front stands of good rolling mills and in the rear stands of common rolling mills. |
| LMM25H | Maximum binder content in LMMH series, good toughness and thermal crack resistance. Used in the stands of pre-finishing rolling mills and for roll rings for hot rolling of ribbed steel. |
| LMM30H | Maximum binder content in LMMH series, good toughness and thermal crack resistance. Used for roll rings for hot rolling of ribbed steel and in the stands of pre-finishing rolling mills. |
| LMM32H | With good toughness and impact resistance, used for bar, deformed bar finish standing rolling. |
| Grade | Recommended applications |
| YGR20 | High wear resistance and corrosion resistance. Used in the last 1~2 stands of finishing mills. |
| YGR25 | High wear resistance and corrosion resistance. Used in the last 1~3 stands of finishing mills. |
| YGR30 | Good toughness, wear resistance, corrosion resistance and thermal crack resistance. Used in the middle and rear stands of finishing mills. |
| YGR40 | Good roughness and thermal crack resistance, good for general purpose. Used in the most stands of the finishing mills and in the rear stands of common mills. |
| YGR45 | Good toughness and thermal crack resistance. Used in the front stands of finishing mills. |
| YGR55 | Good impact resistance. Used in the stands of pre-finishing rolling mills for hot rolling ribbed steel bars and they can be machined with turning and milling. |
| YGR60 | Good impact resistance. Used for hot rolling ribbed steel bars and in the first and second stands of pre-finishing rolling mills. |
| YGH40T | With good toughness and shock resistance, used for preferably high speed wire rolling machine, rolling small size deformed bar finish stand. |
| YGH45T | With good toughness and shock resistance, used for general high speed wire or common rolling machine, rolling small size deformed bar finish stand |
FAQs about tungsten carbide rolls
Tungsten carbide rolls can be used in the intermediate finishing sections of rolling mills.
LMM can produce tungsten carbide rolls with outer diameters of up to 550 millimeters.
To convert from cast iron or steel rolls to tungsten carbide rolls, LMM carbide rolls product speciailists will partner with rolling mills to revise roll cooling, machining, and handling capabilities. Most rolling mills can easily adapt from cast iron to tungsten carbide.
LMM tungsten carbide rolls have a longer lifespan of up to 20 times longer than that of cast iron rolls due to their higher wear resistance. This results in reduced stoppage time for the rolling mill along with higher productivity and lower operational costs
The minimum rolling speed tungsten carbide rolls can be used at is one meter-per-second (1 m/s).
Proper cooling is crucial to ensure optimal performance of carbide rolls. The minimum recommended pressure is 4-to-6 bar and 250-to-300 liters per minute per passform.
Production equipment
The company has an integrated office space including a R&D center and a testing center, and a large-scale modern carbide roller ring production line. It can independently complete the entire process from product design, research and development, production of tungsten carbide powder to cemented carbide roll ring forming, processing, slotting, and rib milling of finished products. It has reached a production scale of 1,000 tons (50,000 pieces of cemented carbide roller rings) per year. The output ranks among the top in the world.
LMM tries its utmost to meet the demand of customers. Our professional R&D department and production line will provide the direct and effective quality and service for you.
With over twenty years’ experience on the production of cemented carbide roll rings, LMM has established an inte-grated system including R&D and extraction of powder and production and marketing of alloy . Through our professional service, you can make the correct choice for the material to match your product.
Our Pre-sales:
recommend suitable products according to the actual working conditions and needs of customers.It can also bedeveloped and designed according to needs, and customized services can be provided. During the epidemic, provide remote detection technical support
Strict quality control:
From raw materials, to the production process and befor eleaving the factory, all performance indicators arestrictly tested, and the professional QC team controls according to the process.
After-sales service:
Quality assurance and Resolution of any issues that arise
LMM GROUP have been supplied to world’s top steel manufacturer :
Australia: Liberty steel/Bluescope steel
Italy: JSW steel
United Arab Emirates：Emirates Steel
Egypt:Ezz Steel
Luxembourg：RIVA Group，ArcelorMittal
Turkey: Tosyalı Holding，İçdaş，Erdemir Group
Spain: Liberty Steel Group，CELSA Steel Group
India: tata-steel，SAIL, SPL，Erdemir Group etc. We do OEM for Concast and Danieli for a long time
With decades of proven experience, our team is prepared to help you achieve your goals, and beyond.
LMM have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, NLMK, MMK, etc. We do OEM for Concast and Danieli for a long time
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