Cemented Carbide Roll Rings Grades

1.Table of grades and properties of cemented carbide roll ring and related data

Grade	Chemical composition		Mechanical properties				Physical properties
Grade	Co+Ni %	WC %	Hardness HRA	Transverse rupture strength(Sample B)MPa	Compressive Strength MPa	Young's modulus of elasticity KN/mm2	Density g/cm3	Thermal conductivity Cal/cm sec/℃
YGH20	10	90	≥86.0	≥2500	3500	560	14.2~14.5	0.2
YGH25	12	88	≥84.0	≥2300	3400	550	14.0~14.3	0.21
YGH30	15	85	≥83.5	≥2520	3300	540	13.8~14.2	0.2
YGH40	18	82	≥83.0	≥2570	3200	500	13.4~13.9	0.19
YGH45	20	80	≥82.0	≥2570	3100	480	13.3~13.9	0.18
YGH55	26	74	≥81.0	≥2570	3000	450	12.6~13.2	0.17
YGR20	10	90	≥85.0	≥2400	3400	550	14.2~14.8	0.2
YGR25	12.5	87.5	≥83.0	≥2270	3300	540	14.0~14.3	0.22
YGR30	15	85	≥83.0	≥2360	3200	530	13.8~14.3	0.2
YGR40	18	82	≥82.0	≥2400	3200	430	13.5~13.9	0.2
YGR45	20	80	≥80.5	≥2250	3000	480	13.4~13.9	0.18
YGR55	25	75	≥79.0	≥2400	2800	420	12.9~13.40	0.17
YGR60	30	70	≥78.5	≥2200	2600	300	12.6~13.1	0.16

2.Recommended applications of grades for carbide roll rings

Grade	Recommended applications
YGH20	Maximum hardness, excellent wears resistance in the series. Used in the last 1-2stands of good high speed finishing mills for rolling common and hard steel bars.
YGH25	Higher wear resistance, moderate impact in the series. Used in the last 1-3stands of good high speed finishing mills for rolling common and hard steel bars.
YGH30	Moderate wear resistance and impact resistance, good for general purposes. Used in the last 1-4stands or all stands of finishing mills.
YGH40	Best for general purposes. Used on the front stands of good mills and in the rear stands of common mills.
YGH45	Used in the first and second stands of finishing mills and in the stands of pre-finishing rolling mills; For every stand of rolling lines for low speed rolling, low precision and unstable operation.
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.

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