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The products of LMM Group have been exported to more than 90 countries, countries & areas in America, Europe, Southeast Asia, the Middle East, Africa, Asia, etc, forming strong and core competitiveness in steelmaking, continuous casting, rolling areas to supply high value-added, green, intelligent and one-stop solution and service to global customers in iron, steel, metallurgical industries, etc.
LMM product segment
Please provide design data for special processing requirements
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 |
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 workshop
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
Quality, Environmental ISO Certificate
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.
Work on site
As professional one-stop solution provider, LIAONING MINERAL & METALLURGY GROUP CO., LTD(LMM GROUP) Established in 2007, and focus on engineering research & design, production & delivery, technology transfer, installation & commissioning, construction & building, operation & management for iron, steel & metallurgical industries globally.
Our product 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
Continuous casting series：
Smart Steel Plant series：
