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Professional engineers provide solutions and technical drawings
86(411) 84174804
lmme-business@lmmgroup.com.cn
We can provide characteristic service and differentiated products according to the different conditions of rolling mill.
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
| 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 | √ |
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 | √ |
LMMGROUP support roller maximum diameter 1650mm
Application: Suitable for all kinds of four-high, six-high single-stand or multi-stand continuous rolling mills
Material | hardness | Hardened layer depth | Hardness uniformity | |
Intermediate Roll | 9Cr2Mo，86CrMoV7，CR-3A,CR-5A,CR-3B,CR-5B,CR-3C | 60-80HSD | ≥75mm | ±2HSD |
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.
Core competitiveness: Promote brand by quality
The company’s good hardware facilities are the strongquarantee of high quality products. has introduced theinternational advancedlevel of casting processingequipment. set up with a complete set of intelligentmodernization and standardization of productionprocess,intelligent production operation and perfectquality control system,ensure the quality, fundamentallyguarantee the implementation of the enterprise branostrategy.
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
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.
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
Certification
The company strictly according to modern enterprise management requirements set up a perfectquality assurance system, and passed the ISO9001:2008 quality management system certification,ISO14001:2004 environmental management system certification, OHSAS18001:1999 occupationalhealth and safety management system certification.
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.
Core competitiveness: Promote brand by quality
The company’s good hardware facilities are the strongquarantee of high quality products. has introduced theinternational advancedlevel of casting processingequipment. set up with a complete set of intelligentmodernization and standardization of productionprocess,intelligent production operation and perfectquality control system,ensure the quality, fundamentallyguarantee the implementation of the enterprise branostrategy.
Production Equipment
The company possesses eight melting facilities:
1.including an Electric Arc Furnace for steel melting of30 tons,
2.45/70 tons LF-VD Furnaces,
3.Electric SlagRemelting Furnaces (10 tons and 15 tons),
4.medium frequency Induction Melting Furnaces (5tons, 10 tons and 20 tons).
These melting facilities intotal can accomplish a daily smelting capacity of 120tons of molten steel, 240 tons of molten iron and 25tons of electric slag remelting. All the meltingfurnaces are automatically controlled by PLC withvery good working conditions; they are equiped withautomatic alarm system and furnished with perfectequipment for eliminating smoke & dust. All the rawmaterials for smelting are strictly controlled, thechemical composition are precisely tested to ensurethe qualified melting process.Thereby, the refiningprocess shows also excellent results.
1. The company has two sets of horizontal centrifugal casting machines, with the maximumspin cast roll size of Dia 1400× 3860mm Barrel Length.
2. The centrifugal casting machinescan realize the integration of spray coating and controlling the mould temperature.
3. They aredriven by hydraulic motor and operated steadily, the speed of rotation could reach 1500 r/min,which can assure the technical requirement ongravity multiple accurately and confirm the best quality of working layer.
There is one set of 45MN Oil Hydraulic Press which can ensure the adequate ratio of forging reduction and deformation for forged rolls.
There are 36sets of machining equiment, including CNC lathes, CNC grinders, and CNC double-sidedmilling machines. The machining range can be dia 80×1000-dia.1600×8000mm and recision ranges up to0.003mm.
Checkout Equipment
The company has the most advanced inspection and testing equipments such as X-ray Fluorescence Spectrometer, Plasma Emission Spectrometer，Optical Emission Spectrometer (OBLF), Hydrogen /Oxygen /Nitrogen Combined Analyzer (LECO), Carbon /Sulfur Analyzer for chemical analysis; and also has Scanning Electron Microscope, Metaloscope, Image Analyzer (Zciss), Microhardness Tester, Universal Testing Machine, Impact Testing Machine, Analog and Digital Ultrasonic Testing Device, Magnetic Powder UT Tester, Stress Meter. PortableLeeb & Shore Hardness Tester, etc. All these instruments and equipments can guarantee the Quality Assurance effectively.
Production Process
Charge Mixture → lntermediate Frequency Furnace Melting → Horizoncal Centrifugal Casting → Preparatory Heat Treatment → Rough Machining → D.H.Treatment → Finish Machining → Packing → Delivery
lnside Structure & Character
Material | Roll Hardness | Uniformity | Neck Hardness | Tensile Strength |
(HSS) | 78-88HS | ≤4 | 35-45HS | ≥450MPA |
(HCS) | 70-80HS | ≤4 | ||
(HCIS) | 70-90HS | ≤4 | ||
(HNCS) | 70-85HS | ≤5 |
lnside Structure & Character
Application | Material | Hardening Layer (mm) | Roll Hardness（HSD） | Uniformity HSD | Neck Hardness HSD |
Working Roll | Cr2 | 13( > 90HSD) | 70~90 | ≤3 | 35-70 |
Cr3 | 32(>90HSD) | 70~103 | ≤3 | 35-70 | |
Cr5 | 50( > 90HSD) | 70~103 | ≤3 | 35-70 | |
Back Up Roll | Cr3-Cr5 | 100 | 60~90 | ≤3 | 30-50 |
Charge Mixture → Electric Arc Furnace Melting → Ladle Refining → Static Casting → Preparatory Heat Treatment → Rough Machining → D.H.Treatment → Finish Machining → Packing → Delivery
lnside Structure & Character
Material | Roll Hardness | Neck Hardness | Tensile Strength |
Alloy Semisteel | 40-65HS | ≤50HS | ≥490MPA |
Alloy Cast Steel | 35-70 HS | ≤45HS | ≥600MPA |
Graphitic Steel | 35-70 HS | ≤45HS | ≥600MPA |
Certification
The company strictly according to modern enterprise management requirements set up a perfectquality assurance system, and passed the ISO9001:2008 quality management system certification,ISO14001:2004 environmental management system certification, OHSAS18001:1999 occupationalhealth and safety management system certification.
Service Display
