Grade and Material

Brief introduction of grade

There are two series of tungsten carbide grades for roll ring in our company.  

WC+Co pure series: Cobalt as the single binder for conventional mills, Corresponding Grade: PLH series.

WC+Co-Ni-Cr series, cobalt-nickel-chromium as the mult-binder, with low water requirements and cost. Corresponding Grade: PLR and PLF series.

The binder content is from 6% to 32% as the following: 

PLH:PL06H, PL08H, PL10H, PL15H, PL18H, PL25H, PL30H, PL32H

PLR:PL08R, PL10R, PL12R, PL18R, PL20R, PL30R, PL32R

PLF:PL20F, PL25F, PL30F, PL32F


The alloys’ hardness and wear resistance come from tungsten carbide (WC) while the toughness and strength depend on the binder (Co, Co-Ni-Cr).

The finishing mill is generally composed of 8-10 stands, 4 front stands, 4 rear stands. As the large truncation surface size of rolled products, the rolls on the front finishing mill are subject to great load and impact. Thus, the high hardness and good thermal fatigue resistance are the primary factors, prior to wear-resistance. For the rolls on the rear stands subjected to the low load and impact, wear-resistance and thermal fatigue resistance of roll rings are more important.

Grades and properties of tungsten carbide roll ring

Grade

Content:

WC + Binder

Properties

PLR

WC + Co-Ni-Cr

High performance-price ratio and low requirement for acidity and alkalinity of cooling water

PLH

WC + Co

Binder is pure Co. suitable for traditional rolling mills. Strict requirements weak alkaline of cooling water.

PLF

WC + Co-Ni-Cr

different grain size structure. Good fracture toughness. suitable for large size TC roll rings on composite rolls.


Multi-Binder Grade


Grade

WC%

Co-Ni-Cr
  (%

Hardness
≥HRA

TRS
≥N/mm2

Density
g/cm3

Application

PL08R

92

8

88

2800

14.7±0.15

the last 1~2 stands of finishing mill for common and hard wire rod.

PL10R

90

10

87.5

2750

14.5±0.15

the last 1~2 stands of finishing mill

PL12R

88

12

86

2700

14.2±0.15

the last 1~4 stands of finishing mill

PL15R

85

15

85

2650

14.1±0.15

the last 1~4 stands, or all stands of finishing mill

PL18R

82

18

83.5

2600

13.7±0.15

the front stands of finishing mill, the rear stands of common mill

PL20R

80

20

82.5

2550

13.5±0.15

Best versatility. for the front stands of finishing mill and the rear stands of common mill.

PL25R

75

25

80.5

2450

13.1±0.15

the 1st and 2nd stand of finishing mill, pre-finishing stands, suitable for the stands with low rolling speed, low precision and unstable rolling process.

PL30R

70

30

79

2350

12.7±0.15

Prefinishing mill stands for hot rolled ribbed wire rod

PL30R

70

32

78

2200

12.7±0.15

Prefinishing mill stands for hot rolled ribbed wire rod


Single-Binder Grade


Grade

WC%

Co%

Hardness
≥HRA

TRS
≥N/mm2

Density
g/cm3

Application

PL06H

94

6

89

2850

14.8±0.15

the last 1~2 stands of finishing blocks in high speed wire rod mill for common and hard wire rod.

PL08H

92

8

88.5

2750

14.7±0.15

the last 1~2 stands of finishing blocks

PL10H

90

10

88

2700

14.5±0.15

the last 3~4 stands of high-speed wire rod finishing mill.

PL15H

85

15

85

2650

14.1±0.15

the last 1~4 stands, or all stands of finishing mill

PL20H

80

20

83

2600

13.5±0.15

Best versatility, used in the front stands of finishing mill and the rear stands of common mill.

PL25H

75

25

81.5

2550

13.1±0.15

Prefinishing mill for hot rolled ribbed wire rod.

PL30H

70

30

80

2450

12.7±0.15

Prefinishing mill for hot rolled ribbed wire rod.

PL32H

68

32

78.5

2300

12.5±0.15

finishing stands of bar mill for bar, rebar and deformed steel bar.


Comparative Table of ISO and PCC grades


China

Sweden

Korea

Japan

   U.S.A

Luxembourg

Germany

PCC

Sandvik

Taegutec

Mitsubishi

Kenna

metal

Sintermet

Ceratizit

Saramant

PL06H

H6T

KHR01


MNO


CE3 (CTC12A)

VG07

PL08R



GA5210


SM80



PL10R

C10C

KHR05

GA5315

MN04

SM63

CE51 (CTC20A)

VN10

PL12R


KHR30

GA5320



CE65 (CTC25A)


PL15R

C15C

KHR10

GA5328

MN2

SM59

CE79 (CTC30A)

VN40

PL18R


KHR40

GA5335



CE103 (CTC35A)

VN45

PL20R

C20C

KHR60

GA5540

MN4

SM60

CE107 (CTC40A)

VN50

PL25R

C25C

KHR75

GA5350

RCV5

SM61

CE114 (CTC50A)


PL30R

C30T

KHR90

GA7365

RCV6

SM62

CE115 (CTC60A)

VN77

PL32R


KHR96







Recommended grade table of TC roll rings for wire rod mills

For wire rod mill with reducing and sizing stands


Rolling Products

Products size (mm)

Prefinishing

Stands

Finishing stands

Reducing stands

Sizing stands

1st-4th 

1st-5th 

6th-10th

1st

2nd

3rd

4th

Round

Wire rod

φ5-φ12

PL25R

PL20R

PL15R

PL15R

PL08R

φ12-φ20

PL20R

PL10R

φ>20

PL30R

PL25R

PL20R

Ribbed wire rod

φ5-φ12

PL25R

PL20R

PL15R

PL15R

PL20R


φ12-φ20

PL20R

PL25R


φ>20

PL30R

PL25R

PL20R




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