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Application：
Section mill，bar mill、intermediate and finishing stands of wire–rod mill，narrow strip mill finishing stand, Plate, flat rack, strip finishing
Product name: Alloy indefinite chilled cast iron rolls
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 | √ |
Chemical composition : Si, C, Mn, Ni, Cr, Mo
Barrel hardness: 50-82
Neck hardness: 35-55
Tensile strength: ＞160 -＞350
Microstructure：Pearlite+cementite+small percentage graphite 、Sorbite tempered bainite+ carbide + graphite + A small amount of martensite or bainite + carbide + graphite
Application：
Section mill，bar mill、intermediate and finishing stands of wire–rod mill，narrow strip mill finishing stand, Plate, flat rack, strip finishing
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 |
casting iron rolls
casting steel rolls
forging steel rolls
hss rolls
We can provide characteristic service and differentiated products according to the different conditions of rolling mill.
Professional engineers provide solutions and technical drawings
86(411) 84174804
lmme-business@lmmgroup.com.cn