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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
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 | √ |
Application
Beam, bar, wire rod mill rough rolling, the rolling,pre-tinishing mill stand; seamless steel pipe mill reducing rack set
Production Equipment
The company possesses eight melting facilities,including an Electric Arc Furnace for steel melting of30 tons, 45/70 tons LF-VD Furnaces, Electric SlagRemelting Furnaces (10 tons and 15 tons), and 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.
The company has two sets of horizontal centrifugal casting machines, with the maximumspin cast roll size of Dia. 1400× 3860mm Barrel Length. The centrifugal casting machinescan realize the integration of spray coating and controlling the mould temperature.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 sixteen sets of car-type electric resistance furnaces and gas furnace so perating with high,medium and lowtemperature, two sets of differential heat treatment furnaces, one set of dual-frequency induction quenching machine, two sets of spray quenching machines, one set of high-frequency hardening machine and 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.
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 |
Mill Rolls Type
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.