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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
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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