Semi-steel roller

Application：

Bar wire, steel, crude and rolled strip, vertical roller, roll rings, support rollers

Product name:Semi-steel roller
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	√

Product parameters

Chemical composition : Si, C, Mn, Ni, Cr, Mo
Barrel hardness: 35-60
Neck hardness: ≤50 – ≤60
Tensile strength: 450-800
Microstructure：Pearlite+Carbide or fine pearlite+A small amount of bainite+Carbide
Application：

Bar wire, steel, crude and rolled strip, vertical roller, roll rings, support rollers

Barrel diameter ≤1000mm

Barrel length ≤3000mm

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

Melting 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.

Casting Equipment

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.

Forging Equipment

There is one set of 45MN Oil Hydraulic Press which can ensure the adequate ratio of forging reduction and deformation for forged rolls.

Heat Treatment Equipment

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.
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.

Machining Equipment

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

Centrifugal Roll Process Technology

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

Forged Roll Process Technology

lnside Structure & Character

Application	Material	Hardening Layer (mm)	Roll Hardness（HSD）	Uniformity HSD	Neck Hardness HSD
Working Roll Intermediate 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

Cast Steel Roll Progress Technology

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

Pre-sales:

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

Need For Some Help ?

Professional engineers provide solutions and technical drawings

phone

86(411) 84174804

mail

lmme-business@lmmgroup.com.cn

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

Service Include

Our Clients Give The Best Feedback

Although the price of LMMGROUP is 1.22 times that of the current rolling stock, through this trial, the data shows that the amount of steel passing through is more than 1.3 times higher than the current rolling stock, and the rolling groove wear of the off-line rolling is better than the current rolling stock.

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.