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Hyper steel
Grinding Media Balls and Cylpebs as per IS
6079-1989:
(a) CHEMICAL COMPOSITION:
The chemical composition of the grinding media will be
as per IS 6079-1989: as follows:
| |
GRADE-1
(For size 60 mm &
above) |
GRADE-2
(For size below 60
mm) |
| Carbon |
1.25-1.50 |
1.60-1.90 |
| Silicon |
1.00
Max. |
1.00
Max. |
| Manganese |
1.20-1.50 |
1.20 -1.50 |
| Chromium |
1.50-2.00 |
1.50-2.00 |
| Sulphur |
0.06
Max. |
0.06
Max. |
| Phospherous |
0.06
Max. |
0.06
Max. |
(i) HARDNESS:
When tested in accordance with IS 1500/1983 the hardness at
any point across the section of the ball is more than 375
BHN.
(ii) MICROSTRUCTURE:
Microstructure shall be free from continuous carbide
network.
(iii) HEAT TREATMENT: The
grinding media is suitably heat treated to obtain the
required hardness and Microstructure.
(iv) STANDARD SIZE OF GRINDING
MEDIA: Balls diameter
(mm)-125,100,90,80,75,70,65,60,50,40,30,25,20,17,15
Cylpebs
(mm)-35 x 35 , 25x25, 22x22, 19x19
(v) TOLERANCE ON SIZE:
Variation on size shall not exceed the following
limits:-
|
SHAPE AND SIZE |
TOLERANCE (mm) |
| (1) Balls
for sizes 60 mm & above |
+/-
2.50 |
| (2) Balls
for sizes 30 to 50 mm & below |
+/-
2.00 |
| (2) Balls
for sizes 15 to 25 mm & below |
+/-
1.50 |
| (3)Cylpebs
for all sizes |
+/-
1.50 |
(i) CHEMICAL COMPOSITION:
The chemical composition of the forged steel grinding media will be
as per IS 12658:1989 as follows:
Forged
Steel
Grinding Media Balls as per IS
12658:1989
| |
EN -44 |
EN -31 |
| Carbon |
0.90 - 1.20 % |
0.95 -1.10 % |
| Manganese |
0.45 -0.70 % |
0.25 - 0.45 % |
| Silion |
0.30 % Max |
0.10 - 0.35 % |
| Sulphur |
0.06 % Max |
0.035 % max |
| Phosphorous |
0.06 % max |
0.035 % Max |
| Chromium |
|
1.40 - 1.60 % |
(iv) STANDARD SIZE OF GRINDING
MEDIA: Balls diameter
(mm)-125,100,90,80,75,70,65,60,50,40,30,25, & 20
Cylpebs
(mm)-25x25, 22x22, 19x19
(v) TOLERANCE ON SIZE:
Variation on size shall not exceed the following
limits:-
|
SHAPE AND SIZE |
TOLERANCE (mm) |
| (1) Balls
for sizes 50 mm & above |
+/-
3.00 |
| (2) Balls
for sizes 50 mm & below |
+/-
2.50 |
| (3)Cylpebs
for all sizes |
+/-
1.50 |
High
chrome steel Grinding Media Balls and Cylpebs
|
Working conditions |
Low abrasion medium impacts |
Low abrasion high impact |
High abrasion high impact |
High abrasion low impact |
High abrasion low impact |
High abrasion low impact |
|
Application |
First
Chamber cement & raw mill |
First
Chamber cement& raw mill |
First
Chamber cement& raw mill |
Second
Chamber of cement raw mill and Coal mill |
Second
Chamber of cement raw mill and Coal mill |
Second
Chamber of cement raw mill and Coal mill |
|
Hardness(HRC) |
58-62 |
60-64 |
61-65 |
59-64 |
60-65 |
60-65 |
|
Cr % |
14-18 |
14-18 |
18-22 |
10-14 |
11-15 |
16-20 |
|
C % |
2.0-3.0 |
2.0-3.0 |
2.5-3.5 |
2.5-3.5 |
2.0-3.0 |
2-3 |
|
Wear
Resistant |
Good |
Good |
Excellent |
Excellent |
Excellent |
Excellent |
|
Impact resistance |
Good |
Excellent |
Excellent |
Low |
Low |
Low |
|
(I)
STANDARD SIZE OF GRINDING MEDIA:
Balls diameter
(mm)-125,100,90,80,75,70,65,60,50,40,30,25, 20,17,13 Cylpebs
(mm)-25x25, 22x22, 19x19, 16x16
(ii) TOLERANCE ON SIZE:
Variation on size shall not exceed the following
limits:-
|
SHAPE AND SIZE |
TOLERANCE (mm) |
| (1) Balls for
sizes 60 mm & above |
+/- 3.00 |
| (2) Balls for
sizes 50 mm & below |
+/- 2.50 |
| (3)Cylpebs for
all sizes |
+/- 1.50 |
(4)
Bull Ring Segment :
As per customer’s specifications
(5)
Liner Plates (High Chrome and Manganese) :
As per customer’s specifications
(6)
Jaw Plates (Mn)
:
As per customer’s specifications
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