COMPOSITE ROLLS
Tungsten carbide composite rolls are engineered for high-temperature rolling applications, with wear resistance and resistance to thermal cracking. Correct roll pass profile processing, maintenance and reasonable use can greatly increase the rolling tonnage of the rolling groove and improve the rolling stability and rolling mill production operation rate.
Introduction to Cemented Carbide Composite Rolls.
Definition of Cemented Carbide Composite Rolls
Composite roll is specially made by combining the cemented carbide roll rings with steel shaft, These rolls are used to produce round bars, reinforcing bars, square and flat sections, angle steel, and other rolled profiles.
Scope Applications of Cemented Carbide Composite Rolls
Cemented carbide composite rolls are suitable for intermediate stands in conventional bar mills, rod and wire mills, and high-speed wire mills operating at 2–50 m/s, subject to mill and roll specifications.
Traditional rod mills
It is used for product stands, pre-slitting stands and intermediate stands of traditional rod mills.
Wire Rod and Bar Mills
Used for the stands of finishing mills and intermediate rolling stands of rod and wire mills.
High speed wire rolling mills
Used in intermediate stands for high speed wire rolling mills.
Small profile mills
Used in pre-finishing and finishing stands for angle steel, square sections, and flat steel.
Advantages of Cemented Carbide Composite Rolls
- The quality of steel products is improved, and the surface quality and tolerance of rolled materials improved thoroughly. They can help control negative dimensional tolerances more consistently.
- The change frequency of groove and roll, the downtime and the labour intensity can be reduced in rolling workshop. Increasing productivity and output can create greater economic benefit at the same time.
- Improved product yield.
- Reducing roll consumption and downtime can help lower the cost per tonne of rolled steel.
Composition and Characteristics of Grades for Cemented Carbide Composite Roll Rings
Cemented carbide is mainly made of tungsten carbide particles and metal binder (often cobalt), When required, nickel, chromium, and other elements may be added in order to improve its hot cracking resistance and corrosion resistance. Different binder content and corresponding WC particle size can yield different cemented carbide grades.
Special Cemented Carbide Roll Rings Series
| Grade | Chemical Composition | Physical & Mechanical Properties | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| WC(%) | Co+Ni+Cr (%) | Density g/cm³ | Hardness HRA | TRS N/mm² | Compressive Strength N/mm² | Young's modulus KN/mm² | Thermal Conductivity | |||
| PC20 | 77 | 23 | 13.25 | 83 | 2950 | 3100 | 450 | 70 | ||
| PC30 | 74 | 26 | 13 | 81.6 | 2920 | 2900 | 450 | 69 | ||
| PC40 | 70 | 30 | 12.65 | 80.9 | 2871 | 2700 | 400 | 61 | ||
| PC50 | 68 | 32 | 12.48 | 79.2 | 2700 | 2320 | 400 | 60 | ||
Special cemented carbide roll rings series: with optimized structure of WC, good hot cracking resistance , used in the stands of finishing rolling mills for rebar , rod and wire , which can greatly increase the amount of single pass rolling tonnage, reduce the labor intensity, so as to improve the production efficiency and obtain better economic benefits.
| Grade | Applications |
| PC20 | Good impact resistance and hot cracking resistance used in the front stands of finishing mills. |
| PC30 | Good wear resistance and hot cracking resistance, used in the stands of pre-finishing rolling mills for hot rolling rebar. |
| PC40 | Good impact resistance and hot cracking resistance, used in round bar finished products and rebar stands. |
| PC50 | Good impact resistance and hot cracking resistance, used in round bar finished products and rebar stands. |
General Cemented Carbide Roll Rings Series
| Grade | Chemical Composition | Physical & Mechanical Properties | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| WC(%) | Co+Ni+Cr (%) | Density g/cm³ | Hardness HRA | TRS N/mm² | Compressive Strength N/mm² | Young's modulus KN/m | Thermal Conductivity | |||
| KTPL25R | 75 | 25 | 13.03 | 79.5 | 2600 | 3100 | 446 | 66 | ||
| KTPL30R | 70 | 30 | 12.73 | 79 | 2600 | 3000 | 425 | 57 | ||
General cemented carbide roll rings series: utilize Co-Ni-Cr as the binder phase, with high wear resistance and corrosion resistance and versatility
| Grade | Applications |
| KTPL25R | Good impact resistance, used in round bar finished and before the finished product stands. |
| KTPL30R | Good impact resistance, used in round bar finished and before the finished product and the slitting stands. |
Construction of Cemented Carbide Composite Rolls
The cemented carbide composite roll is assembled by hydraulic axial compression combination technology with our own intellectual property rights. Hydraulic axial compression combination technology is a method to combine the roll ring and the roll shaft by applying a certain compression force in the axial direction of the roll ring. With the screw thread of hydraulic nut, the force generated by the hydraulic system is transformed into the tension force on the roll shaft, which causes the elastic tensile deformation of the shaft and causes the roll shaft to be compressed, and helping maintain a secure fit between the carbide roll ring and the shaft. Meanwhile, the roll shaft can be reused.
Supporting Technical services
- Service is available for the design, groove and notches machining of cemented carbide composite rolls
- Various machining tools can be provided for machining cemented carbide composite rolls.
- A variety of assembly methods of composite rolls can be offered according to customer requirements.
- Various cemented carbide roll rings are available with diameters of ø300-450 mm and thickness of 30-250 mm for stands of bars and wires.
