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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

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