Mittal

Hyper Steel Grinding Media Balls

We do not intent to supply these items merely on commodity basis but provide complete services required for optimizing wear economics, power consumption and performance level of the mills by giving consideration and proper weightage to important factors like mill dimensions, Grinding circuit, characteristic of feed material (like sixe, grindeability, hardness and moisture contents etc.) users are normally mentioning only chemical composition and hardness of grinding Media in their enquiry which is not sufficient for assessing/ comparing quality level of grinding media from different manufactures. The metallurgy involved in Hyper / Hi Chrome Alloys is highly complex and also manufacturing technology adopted by different manufactures which necessitates full understanding of alloys characteristics and production technologies for developing full confidence in the manufacturing and the product. It is an established fact that martensitic phase and chromium carbides have maximum wear/ abrasion resistant properties and as such microstructures evaluation should be given maximum weightage at the time of comparing quality from different manufactures. An ideal Hyper / High Chrome Alloys should reflect following micro structural characteristics.

Products

»	Hyper Grinding Media Balls

»	Hi-Cr Grinding Media Balls

»	High, Low(Cr) Alloys Steel Castings

»	Manganese Alloys Steel Castings

Specifications:

Hyper steel Grinding Media Balls and Cylpebs as per IS 6079-1989
Chemical composition: The chemical composition of the grinding media will be as per IS 6079 - 1989
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.
Microstructure: Microstructure shall be free from continuous carbide network.
Heat treatment: The grinding media is suitably heat treated to obtain the required hardness and Microstructure.
Standard size of grinding media: Balls diameter (mm) 125, 110, 100, 90 , 80, 70, 60, 50, 40, 30, 20, Cylpebs (mm) 35x35, 30x30, 25x25, 22x22, 18x18, 17x17, 15x15

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

Metal	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.
Phosphorus	0.06 Max.	0.06 Max.
Hardness	375 BHN	375 BHN