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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
Based in China, LMM is one of the largest manufacturers of forged rolls in CHINA, producing up to 30.000 tons of rolls every year.
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 | √ |
LMM Work rolls have an excellent combination of metallurgical and physical properties with uniform and stable hardness ensuring the highest quality of cold-rolled strip and efficient performance characteristics (resistance to wear, thermal shocks, fatigue contact cracks).
physical index
Designation of rolls | Material | Barrel hardness HSD | Neck hardness HSD | Tensile strength Mpa |
work rollⅠ | HCrⅠ | 60-75 | 32-45 | ＞350 |
work roll (Ⅱ) | HCrⅡ | 65-80 | 32-45 | ＞350 |
work roll （Ⅲ） | HCrⅢ | 75-90 | 32-45 | ＞350 |
work roll | HCrS | 70-85 | 35-45 | ≥450 |
chemical index
Designation of rolls | Material | C | Si | Mn | Ni | Cr | Mo |
work rollⅠ | HCrⅠ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 12.00-15.00 | 0.70-1.50 |
work rolll (Ⅱ) | HCrⅡ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 15.01-18.00 | 0.70-1.50 |
work rolll（Ⅲ） | HCrⅢ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 18.01-22.00 | 1.51-3.00 |
Work roll | HCrS | 1.00-1.80 | 0.40-1.00 | 0.50-1.00 | 8.00-15.00 | 0.50-1.50 | 1.50-4.50 |
Microstructure
Designation of rolls | Material | Microstructure |
Work rollsⅠ | HCrⅠ | Bainite +carbide |
Work rolls (Ⅱ) | HCrⅡ | Bainite +carbide |
Work rolls（Ⅲ） | HCrⅢ | A small amount of bainite + martensite + carbide |
Work rolls | CS | tempered martensite + carbide sorbite |
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
Forged steel roll technical Process:
Electric arc furnace smelting → LF \ VD refining → ingot casting → annealing → cleaning → electroslag remelting → annealing → forging → post forging heat treatment → rough machining → preliminary heat treatment → semi finishing → dual frequency quenching or differential temperature treatment → cryogenic treatment → tempering → finishing → packaging and delivery.
Double refining + electroslag remelting to ensure good metallurgical quality
Perfect heat treatment and cold treatment technology to ensure the depth and hardness uniformity of hardened layer
Cast rolls technical Process:
Modeling → smelting → centrifugal casting → cleaning → preliminary heat treatment → rough machining → differential heat treatment → finishing → packaging and delivery.
Temperature controlled cooling + annealing treatment after casting:
the microstructure transformation is more sufficient and the stress state is more stable.
The composition of the working layer adopts multi-element micro alloying technology:
which takes into account wear resistance and accident resistance, and has better comprehensive performance.
The multi-layer composite technology: is adopted to effectively block the diffusion of high alloy content in the working layer to the core structure and ensure the strength and toughness of the core structure.
Differential heat treatment technology: is adopted to make the microstructure change fully and the stress distribution more stable and reasonable.
At LMM GROUP, we are ready to troubleshoot and solve any challenge you have. Whether you require a standard or custom work roll, our superior manufacturing process always results in superior rolls for your leveling equipment, unsurpassed strength, and reliability, LMM for work rolls that will keep your production moving forward, even in the most demanding applications.
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.