professional TC roll rings of finishing rolling mill (1.2-2.0)mm
tungsten carbide pellet
cemented carbide roll rings (also known as tungsten carbide roll
ring) possesses good thermal conduction property.Compared with other materials,it is much better
in terms of heat-resistance, wear-resistance and strength.What ’s more,its hardness reduces a
little under the condition of high temperature.So ,the cemented carbide roll rings is invented
with the ap-pearance of
high speed wire rod mill.With the development and improvement,it is
widely applied in the production of high speed wire,bar and deformed steel bar.
As far as the material for our products,there are two series as
Wc-Co and Wc-Co-Ni-Cr which possess the good compre-hensive mechanical properties.The bending
strength and impact toughness reach 2200 Mpa and(4-6) x106J/ m'respectively.Its
hardness and wear resistance come from tungsten carbide (Wc) while the toughness and strength
depend on the binding agent
(Co-Ni-Cr).
At present,the finishing mill is generally composed of 8- 10
stands.Because of the big size of fracture surface of rolled
part,the collar on the front stands of finishing mill may resist
heavy duty and
strong impact.Thus,the high hardness and good thermal fatigue
resistance are the primary factors,which are prior to
wear-resistance.While there is low load and impact for therear
stands,
we shall pay more attention to the wear-resistance and thermal
fatigue resistance of roll rings.
At present,the finishing mill is generally composed of 8- 10
stands.Because of the big size of fracture surface of rolled
part,the collar on the front stands of finishing mill may resist
heavy duty and
strong impact.Thus,the high hardness and good thermal fatigue
resistance are the primary factors,which are prior to
wear-resistance.While there is low load and impact for therear
stands,
we shall pay more attention to the wear-resistance and thermal
fatigue resistance of roll rings.
| Grade | Chemical
composition | Mechanical properties | Physical properties |
|
Co+Ni
%
| WC
% | Hardness
HRA | Transveres rupture
strength
(Sample B)
MPa | Compressive
Strength
MPa
| Young's
modulus of
elasticty
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 | 12.9-13.4 | 0.17 |
| YGR60 | 30 | 70 | ≧78.5 | ≧2200 | 2600 | 300 | 12.6-13.1 | 0.16 |
| Grade | Recommended applications |
| YGH20 | Maximum hardness ,excellent wear resistance in the series.Used in
the last 1-2 stands of good high speed line mills for rolling
common and hard bars. |
| YGH25 | Higher wear resistance,moderate impact resistance in the
series.Used in the last 1-3 stands of good high speed line mills
for rolling common and hard bars. |
| YGH30 | Moderate wear resistance and impact resistance,good for general
purposes.Used in the last 1-4 stands of finish rolling mills. |
| YGH40 | Best for general purposes.Used in the front stands of good mills
and in the rear stands of common mills. |
| YGH45 | Used in the first and second stands of finish rolling mills and in
the stands of prefinish rolling mills.For every stand of the
rolling lines for low speed rolling,low precision and unstable
operation. |
| YGH55 | Maxmum binder content in YGH series,good toughness and crack
resistance.Used in the stands of perfinish rolling mills and for
rolling screw thead steel |
| Grade | Recommended application |
|
| YGR20 | High wear resistance and corrosion resistance.Used in the last 1-2
stands of finish rolling mills. |
|
| YGR25 | High wear resistance and corrosion resistance.Used in the last
1-3stands of finish rolling mills. |
|
| YGR30 | Good toughness,wear resistance,corrosion resistance and crack
resistance.Used in the middie and rear stands of finish rolling
mills. |
|
| YGR40 | Good toughness and thermal crack resistance,dood for general
purposes.Used in the most stands of finish rolling mills and in the
rear stands of common mills. |
|
| YGR45 | Good toughness and thermal crack resistance,Used in the front
stands of finish rolling mills. |
|
| YGR55 | Good impact resistance.Used in the stands of prefinish rolling
mills for hot rolling screw thread steel bars and they, can be
machined with turning and milling. |
|
| YGR60 | Good impact resistance and toughness. Used for hot rolling screw
thread steel bars and in the first and second stands of prefinish
rolling mills. |
|
The allowable deviation of carbide roll rings
Radial runoutofgroove ≤ 0.013mm
Radial runout of periphery ≤0.01 3mm
End face runout ≤ 0.02mm
End face planeness ≤ 0 .01mm
End face parallelism ≤ 0.01mm
Innerholecylindericit ≤ 0.01mm
Roughness of carbide rolls
inner hole roughness 0.4 u m
periphery roughness0.8 u m
end face roughness 0.4 u m
