tungsten carbide rolls
- reduce mill downtime, high rolling speed, increase productivity
- made from virgin raw materials, a wide range of grade applications, HIP sintering
- good surface finish for rolled product
- good wear resistance, high strength and toughness, excellent red hardness and heat fatigue resistance
- Non-destructive ultrasonic flaw detection, without sand hole, pore, cracks and inclusions
Tungsten carbide rolls are widely used in the production of wire rods, rebars and seamless steel pipes due to their good properties, which greatly improve the working efficiency of the rolling mill. According to the different working conditions of different stands and rolls, a variety of different grades of cemented carbide rolls have been developed.
Dimension of carbide roll rings
| D(mm) | d(mm) | H(mm) |
|---|---|---|
| 145-380 | 87-260 | 62-130 |
Tolerance of carbide roller rings
| grade of tolerance | I | II | III | IV |
|---|---|---|---|---|
| OD(±) | 0.02 | 0.05 | 0.10 | 0.15 |
| ID(±) | IT5 | IT6 | IT7 | IT8 |
| H(±) | 0.03 | 0.1 | 0.20 | 0.5 |
- radial runout of grooves<=0.013mm
- radial runout of periphery<=0.013mm
- end face runout<=0.02mm
- end face planeness<=0.01mm
- end face parallelism<=0.01mm
- inner hole cylindericity<=0.01mm
Grade for tungsten carbide hot rolls
| Grade | Co+Ni+Cr % | WC % | Density g/cm3 | T.R.S Mpa | Hardness HRA | Thermal conductivity Cal/cm.s.℃ | Compressive Strength Mpa | Young's modulus of elasticity KN/mm2 |
|---|---|---|---|---|---|---|---|---|
| YGR20 | 10 | 90 | 14.49 | ≥2400 | ≥85.0 | 0.2 | 3400 | 550 |
| YGR25 | 12.5 | 87.5 | 14.21 | ≥2270 | ≥83.0 | 0.22 | 3300 | 540 |
| YGR30 | 15 | 85 | 14.03 | ≥2360 | ≥83.0 | 0.2 | 3200 | 530 |
| YGR40 | 18 | 82 | 13.73 | ≥2400 | ≥82.0 | 0.2 | 3200 | 430 |
| YGR45 | 20 | 80 | 13.53 | ≥2250 | ≥80.5 | 0.18 | 3000 | 480 |
| YGR55 | 25 | 75 | 13.2 | ≥2400 | ≥79.0 | 0.17 | 2800 | 420 |
| YGR60 | 30 | 70 | 12.68 | ≥2200 | ≥78.5 | 0.16 | 2600 | 300 |
| YGH20 | 10 | 90 | 14.47 | ≥2500 | ≥86.0 | 0.2 | 3500 | 560 |
| YGH25 | 12 | 88 | 14.25 | ≥2300 | ≥84.0 | 0.21 | 3400 | 550 |
| YGH30 | 15 | 85 | 14.02 | ≥2520 | ≥83.5 | 0.2 | 3300 | 540 |
| YGH40 | 18 | 82 | 13.73 | ≥2570 | ≥83.0 | 0.19 | 3200 | 500 |
| YGH45 | 20 | 80 | 13.53 | ≥2570 | ≥82.0 | 0.18 | 3100 | 480 |
| YGH55 | 26 | 74 | 13.05 | ≥2570 | ≥81.0 | 0.17 | 3000 | 450 |
| Grade | Application |
|---|---|
| YGR20 | High wear resistance and corrosion resistance. Used in the last 1-2 stands of finishing mills. |
| YGR25 | High wear resistance and corrosion resistance. Used in the last 1-3 stands of finishing mills. |
| YGR30 | Good toughness, wear resistance, corrosion resistance and thermal crack resistance. Used in the middle and rear stands of finishing mills |
| YGR40 | Good toughness and thermal crack resistance, good for general purposes. Used in most stands of the finishing mills and in the rear stands of common mills. |
| YGR45 | Good toughness and thermal crack resistance. Used in the front stands of finishing mills. |
| YGR55 | Good impact resistance. Used in the stands of pre-finishing rolling mills for hot rolling ribbed steel bars and they can be machined with turning and milling. |
| YGR60 | Good impact resistance . Used for hot rolling ribbed steel bars and in the first and second stands of prefinishing rolling mills. |
| YGH20 | Maximum hardness, best wear resistance in the series. Used in the last 1-2 stands of good high speed rolling mills for rolling common and hard steel bars. |
| YGH25 | Higher wear resistance, moderate impact resistance in the series. Used in the last 1-3 stands of good high speed finishing rolling mills for rolling common and hard steel bars. |
| YGH30 | Moderate wear resistance and impact resistance, good for general purposes. Used in the last 1-4 stands or all stands of finishing mills. |
| YGH40 | Best for general purposes. Used in the front stands of good rolling mills and in the rear stands of common rolling mills. |
| YGH45 | Used in the first and second stands of finishing rolling mills and in the stands of pre-finishing rolling mills. For every stand of rolling lines for low speed rolling, low precision and unstable operations. |
| YGH55 | Maximum binder content in YGH series, good toughness and thermal crack resistance. Used in the stands of pre-finishing rolling mills and for roll rings for hot rolling of ribbed steel. |
the manufacturing process for tungsten carbide roll
powder milling → formula according to grade→ wet grinding → mixing → crushing → drying → sieving → adding forming agent → redrying → sieving to obtain a mixture → granulating → pressing → forming → Sintering →preforms→rough machining by flat grinding→non-destructive ultrasonic flaw detection →finishing machining by flat grinding→internal grinding →external grinding→chamfering→notching machining→laser marking→inspection →packing → Storage
