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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
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
High-speed steel roll is the hot roll material with the shortest time of birth, the fastest development and the widest application prospect. High-speed steel is also known as wind steel or front steel, which means that it can be hardened even when it is cooled in air during quenching, and it is very sharp. It is an alloy steel with complex composition, containing carbide forming elements such as tungsten, molybdenum, chromium, vanadium and so on. The total amount of alloying elements is about 10%~25%.
At present, high-speed steel roll series products are widely used in:
● High-speed bar pre-finishing stand, finished product stand, finished product pre-rolling stand, pre-slicing stand, slitting stand of bar rolling mill
● High-speed wire rod mill pre-finishing mill
● Hot rolling narrow and medium wide steel rolling mill finishing mill
● Finishing stand of spring flat steel mill and small section steel mills such as angle steel and channel steel
During the use of high-speed steel rolls, 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 high-speed steel roll is significantly improved.
It can be seen from the metallographic photos that the metallographic structure of the high-speed steel 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.
The high-speed steel roll material contains high alloy elements such as vanadium, tungsten, chromium, molybdenum, niobium, etc. The types of carbides in the roll structure are mainly MC type and M2C type. Compared with ductile iron rolls and high-nickel-chromium rolls, the single-groove (time) steel passing is higher, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, reduces production costs, and improves the overall benefit of the factory.
| Designation of rolls | Material | C | Si | Mn | Ni | Cr | Mo | V | W |
| HSS | HSS | 1.50-2.20 | 0.30-1.00 | 0.40-1.20 | 3.00-8.00 | 2.00-8.00 | 2.00-9.00 | 2.00-9.00 | 0.00-2.00 |
| S-HSS | S-HSS | 0.60-1.20 | 0.80-1.50 | 0.50-1.00 | 3.00-9.00 | 2.00-5.00 | 2.00-5.00 | 0.40-3.00 | 0.00-3.00 |
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.
The manufacture and inspection of high-speed steel roll products are strictly in accordance with the relevant requirements of national standards such as GB/T 13313-2008 “Roll Shore and Leeb Hardness Test Methods” and GB/T 1503-2008 “Cast Steel Rolls”.
Testing regulations:
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.
The following table shows the use effect of high-speed steel rolls on continuous bar rolling mills:
About Company
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.
Production equipment
Technical excellence in our core competencies – melting, casting, forging, heat treating and machining – allows us to provide a superior product and meet the most demanding requirements of our customers.
Meet the largest specification of casting roll Φ1400X4600X9000
Strictly control the uniformity of furnace temperature to ensure the consistency of roll hardness.
The equipments all use computer centralized control automation system
To meet various precision and requirements Equipped with:
Whole process quality and inspection system from raw materials to finished rolls
The whole process implements computer information collection and feedback processing.
Equipped with
At LMM GROUP, we are ready to troubleshoot and solve any challenge you have. Whether you require a standard or custom forged rolls, our superior manufacturing process always results in superior rolls for your leveling equipment, unsurpassed strength, and reliability, LMM for forged rolls that will keep your production moving forward, even in the most demanding applications.
LMM GROUP
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.
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
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Our Client Say?
The trial data shows that the ∮370mm high-speed steel roll produced by LMMGROUP has far exceeded the single-groove assessment value of 1,500 tons in the “Roll Ordering Technical Agreement”, and the effect is good.
On September 10, 2015, in the rolling process of the steel rolling mill, the LMMGROUP high-speed steel bar rolling experiment was carried out on the first bar line C12 to four cuts, and C14 three cuts to K1, K2, K3, and K4. According to the trial situation, The average amount of steel passing through LMMGROUP rolling is about 50%-60% of the alloy rolling spoke. The processing difficulty of high-speed steel is low, and the processing cost is lower than that of the alloy rolling wheel. Our factory can achieve normal processing.
LMM GROUP have been supplied to world’s top steel manufacturer :
Australia: Liberty steel/Bluescope steel
Iran: Oxin steel
Italy: JSW steel
United Arab Emirates：Emirates Steel
Egypt:Ezz Steel
Russia:MMK，Mechel, NLMK
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
* 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.