Grinding Balls

Grinding media is the working part of a mill. It will consume power whether it is doing grinding work or not. The amount of work which it does depends upon its size, its material, its construction and the quantity involved. It is, therefore, advantageous to select the type of grinding media which will prove most economical, the size of media which will give the best grinding results, and the quantity of media which will just produce the grind required.

The usual materials for balls are chilled cast iron and forged steel, for rods, high- carbon steel, (0.8 to 1.0 per cent carbon) all more or less alloyed. Mild steel rods are unsuitable for the reason that they bend and kink after wearing down to a certain minimum diameter and snarl up the whole rod load. The hardened steel rods break up when they wear down and are removed at about 1 in. or left in an eventually discharge in small pieces.

Casting Balls Chemical Components

Forged Balls Chemical Components

Material	C	Mn	Si	Cr	S	P
45#	0.42-0.48	0.50-0.80	0.17-0.37	≤0.25	≤0.035	≤0.035
50Mn	0.48-0.56	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
60Mn	0.57-0.65	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
65Mn	0.62-0.70	0.90-1.20	0.17-0.37	≤0.25	≤0.030	≤0.035
B2	0.75-0.85	0.70-0.90	0.17-0.37	0.40-0.60	≤0.030	≤0.030
B3	0.55-0.65	0.75-0.90	0.20-0.37	0.85-1.20	≤0.030	≤0.030
B4	0.58-0.66	0.65-0.80	1.60-1.90	0.70-0.90	≤0.030	≤0.030
B6	0.97-1.03	1.00-1.10	0.20-0.30	0.50-0.60	≤0.025	≤0.025

Grinding Cylpebs Chemical Components

Material	C	Mn	Si	Cr	S	P
Superhigh chrome (Cr 23-30)	2.0-3.3	0.50-0.80	≤1.2	23.0-30.0	≤0.06	≤0.10
Superhigh chrome (Cr 18-23)	2.0-3.3	0.70-1.0	≤1.2	18.0-23.0	≤0.06	≤0.10
High chrome (Cr 14-18)	2.0-3.3	0.70-1.0	≤1.2	14.0-18.0	≤0.06	≤0.10
High chrome (Cr 10-14)	2.0-3.3	0.90-1.20	≤1.2	10.0-14.0	≤0.06	≤0.10
Medium chrome (Cr 6-10)	2.1-3.3	0.70-0.90	≤1.2	6.0-10.0	≤0.06	≤0.10
Medium chrome (Cr 3-6)	2.1-3.3	0.75-0.90	≤1.2	3.0-6.0	≤0.10	≤0.10
Low chrome (Cr 0-3)	2.1-3.3	0.65-0.80	≤1.5	1.0-3.0	≤0.10	≤0.10

What is steel grinding ball proportioning?