The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

Professional Mill Roll Manufacturer

Alloy chilled cast iron rolls

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

Designation of rollsMaterialApplication
NiCrMo chilled cast iron rolls (Ⅰ)CCⅠSection mill、bar mill、wire-rod mill narrow strip mill、finishing stand
NiCrMo chilled cast iron rolls (Ⅱ)CCⅡSection mill、bar mill、wire-rod mill narrow strip mill、finishing stand
NiCrMo chilled cast iron rolls(Ⅲ)CCⅢSection mill、bar mill、wire-rod mill narrow strip mill、finishing stand
NiCrMo chilled cast iron rolls(Ⅳ)CC ⅣSection mill、bar mill、wire-rod mill narrow strip mill、finishing stand

Physical properties and applications

Designation of rollsMaterialCSiMnNiCrMo
NiCrMo chilled cast iron rolls (Ⅰ)CCⅠ3.00-3.400.30-0.800.20-1.000.50-1.000.20-0.600.20-0.60
NiCrMo chilled cast iron rolls (Ⅱ)CCⅡ3.00-3.400.30-0.800.20-1.001.10-2.000.30-1.200.20-0.60
NiCrMo chilled cast iron rolls(Ⅲ)CCⅢ3.00-3.400.30-0.800.20-1.002.10-3.000.50-1.500.20-0.60
NiCrMo chilled cast iron rolls(Ⅳ)CC Ⅳ3.00-3.400.30-0.800.20-1.003.10-4.000.50-1.700.20-0.60

 

Physical properties and applications

Designation of rollsMaterialBarrel hardness HSDNeck hardness HSDTensile strength Mpa
NiCrMo chilled cast iron rolls (Ⅰ)CCⅠ60-7032-50>150
NiCrMo chilled cast iron rolls (Ⅱ)CCⅡ62-7535-52>150
NiCrMo chilled cast iron rolls(Ⅲ)CCⅢ65-8032-45>350
NiCrMo chilled cast iron rolls(Ⅳ)CC Ⅳ70-8532-45>350

 

Designation of rollsMaterialMicrostructun
NiCrMo chilled cast iron rolls (Ⅰ)CCⅠPearlite + cementite
NiCrMo chilled cast iron rolls (Ⅱ)CCⅡFine pearlite : cementite
NiCrMo chilled cast iron rolls(Ⅲ)CCⅢFine pearlite : cementite
NiCrMo chilled cast iron rolls(Ⅳ)CC ⅣSorbite + cementite

Scope of supply
Barrel diameter≤1400mm
Barrel length≤4600mm

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.

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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

  • 20T/30T dual power inverter intermediate frequency electric furnace
  • lOT, 5T, 3T intermediate frequency electric furnace, a total of 8
  • 60T LF ladle slightly smelting furnace
  • 60TVD vacuum refining furnace
  • V.C vacuum casting furnace
  • Equipped with advanced Spraying and sand casting equipment

Strictly control the uniformity of furnace temperature to ensure the consistency of roll hardness.

The equipments all use computer centralized control automation system

  • 30 numerically controlled resistance high low temperature heat treatment furnaces
  • Spray quenching equipment
  • Open differential temperature heat treatment furnaces
  • Gas baking furnaces

To meet various precision and requirements Equipped with:

  • Over 20 large-sized imported NC grinding machines
  • Large-medium sized NC lathes
  • Large-medium sized NC planer-type double-side milling machines
  • As well as over 100 dedicated lathes for various rolls of C61250, C61200, C61125, C84180, C84160, C8463, C8440 and C91250 and etc.

Whole process quality and inspection system from raw materials to finished rolls

The whole process implements computer information collection and feedback processing.

Equipped with

  • American Leco CS230 carbon and sulfur analyzer,
  • German Bruker Q8 direct reading spectrometer,
  • Japanese Shimadzu MNV-2T golden microscope,
  • German KK USD12 ultrasonic flaw detector, and etc.

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.

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

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.

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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 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

Pre-Sales Service

* 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.

After-Sales Service

* 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.

Rolling Mill Roll Manufacturer​

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We would be happy to help and advise if you have any questions or inquiries.