One stop solution for rolling mill rolls

High-speed steel roll

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 GROUP have been supplied to world’s top steel manufacturer :

Australia: Liberty steel/Bluescope steel
Iran: Oxin steel
Italy: JSW steel
United Arab EmiratesEmirates 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

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

Product parameters

Chemical composition : Si, C, Mn, Ni, Cr, Mo, V, W
Barrel hardness:
Neck hardness: 30-45
Tensile strength: 400-500
MicrostructureA small amount of tempered martensite + carbide + carbon

Rolled strip, bar finishing roller, high speed wire pre-finishing, steel roller universal rolling mill, wide plate mill work rolls

Barrel diameter ≤1000mm
Barrel length ≤3000mm

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.

  1. There are sixteen sets of car-type electric resistance furnaces and gas furnace so perating with high, medium and lowtemperature.
  2. Two sets of differential heat treatment furnaces.
  3. One set of dual-frequency induction quenching machine.
  4. Two sets of spray quenching machines.
  5. One set of high-frequency hardening machine.
  6. Two sets of deep freezing treatmentt roughs.
    All the furnaces are computer-controlled, with the furnace temperature deviation less than 10℃, which ensures very good uniformity of roll hardness.

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.

  • Well equipped chemical and physical labs
  • Standard test and inspection procedures
  • Records and samples are kept till roll scraped
  • Final inspection done by QC Dept of third party
  • Advanced and mature process as shown previously
  • Technical confirmation during Heat Treatment process
  • Most of equipments are computer-controlled
  • Standard operation guided by specified process cards
  • Traceable operation records

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


Roll Hardness


Neck Hardness

Tensile Strength















lnside Structure & Character



Hardening Layer (mm)

Roll Hardness(HSD)

Uniformity HSD

Neck Hardness HSD

Working Roll
Intermediate Roll


13( > 90HSD)










50( > 90HSD)




Back Up Roll






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


Roll Hardness

Neck Hardness

Tensile Strength

Alloy Semisteel




Alloy Cast Steel

35-70 HS



Graphitic Steel

35-70 HS



Product production process

Static Cast Rolls

Centrifugal Cast Rolls

Forged Rolls


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

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 

About LMM

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.

We can provide characteristic service and differentiated products according to the different conditions of rolling mill.

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