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Tungsten Carbide Rolls and Rings

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(1) Tungsten Carbide rolls

Main grades of carbide rolls

Grade

Chemical

Composition

Hardness

(HRA)

Density

(g/cm3)

Transverse

Rupture Strength

(MPa)

Compressive

Strength

(MPa)

YGH05

YGH10

YGH30

YGH45

YGH55

YGH60

YGR30

YGR45

YGR55

YGR60

PA10

PA20

PA30

Co+Ni+Cr

88.5

87.8

84.8

83.6

82.1

80.8

84.2

81.7

79.5

79.1

84.4

14.91

14.71

13.99

13.55

13.03

12.72

13.98

13.52

13.01

12.71

14.52

13.95

13.47

2620

2870

2840

2700

2730

2900

2720

2630

2750

2910

2760

3700

3500

3300

3100

3000

3200

3000

2800

2600

3800

3700

3300

Note:The above property data are typical.

Popular size of carbide rolls

O.D	I.D	Thickness
145-450	87-280	62-210

(a) Rolling mills with reducing & sizing mill

（b）Rolling mills with reducing & sizing mill

（c）The grades YGR55 and YGR60 are also for hot rolling rebars

(2) Tungsten Carbide Composite type Roll Rings

（a）Grade of composite cemented carbide roll rings

Grade	Element content %		Physical and mechanical properties
Grade	Co+Ni	WC and others	Hardness HRA	Transverse rupture strength (Sample B) MPa	Density g/cm3
YGR55	26	74	≥79.0	≥2400	12.93~13.13
YGR60	30	70	≥78.5	≥2200	12.63~12.83

Cemented carbide roll ring is a kind of tool material which consists of tungsten carbide and cobalt with high hardness and. wear resistance.To take advantage of high wear resistance,long life and high efficiency of cemented carbide roll rings during the high speed rolling,attention should be paid as follows when purchasing and using cemented carbide roll rings:

（b）Grades selection

An overall understanding of the properties of cemented carbide grades is a basis for correctly selecting the grades for roll rings used in the stands of rolling mills and an optimal combination of grades is required for the various stands of rolling mills.

Parameters

Grade	Chemistry%		Mechanical Property				Physical property
Grade	Co+Ni	WC	Hardness HRA	Transverse rupture strength N/mm2	Compressive strength N/mm2	Young Modulus KN/mm2	Density g/cm3	Heat conductivity sec/℃
YGH20	10	90	≥86.0	≥2500	3500	560	14.2~14.5	0.20
YGH25	12	80	≥84.0	≥2300	3400	550	14.0~14.3	0.21
YGH30	15	85	≥83.5	≥2520	3300	540	13.8~14.2	0.20
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
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	0.20
YGR40	18	82	≥82.0	≥2400	3200	430	13.5~13.9	0.20
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
YGH05	6	94	≥83.0	≥2360	3200	530	13.8~14.3	0.20
YGH10	8	92	≥82.0	≥2400	3200	430	13.5~13.9	0.20
PA10	10	90	≥80.5	≥2250	3000	480	13.4~13.9	0.18
PA20	15	85	≥79.0	≥2400	2800	420	12.9~13.4	0.17
PA30	20	80	≥78.5	≥2200	2600	300	12.6~13.1	0.16

Note:1.Physical & mechanical properties are for reference only and their variations are as per national of enterprises' standards.

2.Related data.

（c）Recommended Applications

Grade	Recommended applications
YGR20	High wear resistance and corrosion resistance.Used in the last 1-2 stands of finishing mils.
YGR25	High wear resistance and corrosion resistance.Used in the last 1-3 stands of finishing mils.
YGR30	Good toughness wear resistance corrosion resistance and thermal crack resistance.Used in the middle and rear stands of finishing mills.
YGR40	Good toughness end thermal crack resistance good tor 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 mi for hat 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 pre-finishing rolling mils.
YGH05	The WC content of the grades is higher than that of other roll grades used in high-speed wire mills.They have higher hardness and wear resisance properties Because tungsten carbide has exceilent heat transfer property. The high WC content will increase the ability of hot cracking resistance.These characteristics of the grades can make the rolled wires with regular shape and good surface quality.At the same time,the high fracture toughness make them enough to bear mechanical stress during rolling.
YGH10

（d）grades recommended for use in different stands

Grade series				YGR			YGH
Mill classes				A	B	C	A	B	C
Stands of prefinishing mill	1	1		YGR60	YGR60	YGR60	YGH60	YGH60	YGH60
	2	2		YGR60	YGR60	YGR60	YGH60	YGH60	YGH60
	3	3		YGR55	YGR55	YGR60	YGH55	YGH55	YGH55
	4	4		YGR55	YGR55	YGR55	YGH55	YGH55	YGH55
Stands of finishing mill	5	5		YGR40	YGR45	YGR45 （YGR55）	YGH45	YGH55	YGH55
	6	6		YGR40	YGR45	YGR45	YGH45	YGH55	YGH55
	7	7		YGR40	YGR45	YGR45	YGH40	YGH45	YGH55
	8	8		YGR40	YGR45	YGR45	YGH40	YGH40	YGH55
	9	○	○	YGR30	YGR40	YGR45	YGH30	YGH40	YGH45
	10	○	○	YGR30	YGR40	YGR45	YGH30	YGH40	YGH45
	11	○	○	YGR30	YGR40	YGR40	YGH30	YGH40	YGH45
	12	○	○	YGR30	YGR40	YGR40	YGH30	YGH40	YGH45
	13	○	○	YGR20 （YGR25）	YGRYGR40 （YGR30）	YGR40	YGH20 （YGH25）	YGH25 （YGH30）	YGH40
	14	○	○	YGR20 （YGR25）	YGR25 （YGR30）	YGR40	YGH20 （YGH25）	YGH25 （YGH30）	YGH40
Stands for reducing and sizing mill	15	○	○	YGR40	YGR45 （YGR40）	YGR45	YGH40	YGH45 （YGH40）	YGH45
	16	○	○	YGR40	YGR45 （YGR40）	YGR45	YGH40	YGH45 （YGH40）	YGH45
	17	○	○	YGR20 （YGR25）	YGR30 （YGR25）	YGR40 （YGR30）	YGH20 （YGH25）	YGH30 （YGH25）	YGH40 （YGH30）
	18	○	○	YGR20 （YGR25）	YGR30 （YGR25）	YGR40 （YGR30）	YGH20 （YGH25）	YGH30 （YGH25）	YGH40 （YGH30）