Ball mill steel ball-Accessories-The Nile Machinery Co.,Ltd-The Nile Machinery Co.,Ltd

1. product description
chromium alloy ball is widely used in cement preparation, metal mine, coal slurry thermal power, chemical engineering, ceramic coatings, light industry papermaking, magnetic materials and other industries for powder preparation and ultra-fine processing. The surface hardness of high-chromium alloy casting balls can reach 65HRC, and the surface hardness of low-chromium alloy casting balls can reach 45HRC or more. And the average hardness gradient distribution, low wear, good toughness, less fragmentation, product quality is not lower than the GB/T17445-2009 standard, from beginning to end will not be deformed, out of round. Improve the specific surface area of cement and concentrate recovery rate, while increasing the mill production capacity, extend the service life of mill liners, and greatly reduce the company's production costs.

2. Production Process
Medium frequency electric furnace is used for smelting and micro alloying of high quality scrap steel, chrome alloy and other alloy materials, quenching and tempering, and recasting with steel mold; pouring by constant temperature casting method to ensure that the product has no quality defects such as sand, porosity and collapse; Heat treatment oil quenching process, quenching and tempering change the internal structure of the sphere, reduce the stress inside the sphere, ensure the fracture rate, and further improve the performance after quenching; advanced spectral detection is used in front of the furnace, after the furnace, semi-finished products and finished products to ensure chemistry Stable composition and performance.

3. Classification of chromium alloy cast ball and technical parameters
Chrome alloy casting balls can be classified into high chromium alloy casting balls, medium chromium alloy casting balls and low chromium alloy casting balls according to their chemical compositions.

High chromium alloy casting ball technical parameters
Chemical composition

Name	chemical composition（%）
Name	C	Si	Mn	Cr	Mo	Cu	P	S
Ordinary high chromium ball	2.0-3.3	≤1.2	0.3-1.5	10-13	0-3.0	0-1.2	≤0.1	≤0.06
Special high chromium ball	2.0-3.3	≤1.2	0.3-1.5	15-23	0-3.0	0-1.2	≤0.1	≤0.06

Mechanical properties and metallographic structure

Name	Surface hardness（HRC）	Impact value （J/cm2）	metallographic structure	Falling ball impact fatigue life
Ordinary high chromium ball	≥58	≥4	M+C+A	≤φ80	≥15000
				≥φ80	≥10000
M-martensite C-carbide A-retained austenite

Medium chromium alloy casting ball technical parameters
chemical composition

Name	cchemical composition（%）
Name	C	Si	Mn	Cr	Mo	Cu	P	S
Medium chromium alloy casting ball	2.0-3.3	≤1.2	0.3-1.5	3-6	0-1.0	0-1.2	≤0.1	≤0.06

Mechanical properties and metallographic structure

Name	Surface hardness（HRC）	Impact value （J/cm2）	metallographic structure	Falling ball impact fatigue life
Ordinary high chromium ball	≥58	≥4	M+C+A	≤φ80	≥15000
				≥φ80	≥10000
M-martensite C-carbide A-retained austenite

Low chromium alloy casting ball technical parameters
chemical composition

Name	chemical composition（%）
Name	C	Si	Mn	Cr	Mo	Cu	P	S
Ordinary high chromium ball	2.1-3.6	≤1.5	0.3-1.5	1-3	0-1.0	0-0.8	≤0.1	≤0.1

Mechanical properties and metallographic structure

Name	Surface hardness（HRC）	Impact value （J/cm2）	metallographic structure	Falling ball impact fatigue life
Low chromium alloy Cast ball	≥45	≥2.5	P+C	≥10000
P- pearlite C-carbide

4. Product specification

specification（mm）	Weight（kg）	Quantity（pc/t）
φ30	0.11	9091
φ40	0.25	3891
φ50	0.50	2000
φ60	0.86	1153
φ70	1.37	729
φ80	2.05	487
φ90	2.90	345
φ100	4.00	250
φ110	5.30	188
φ120	6.80	147
φ130	7.70	129
φ140	8.74	114

Note: If the above products need to adjust the chemical composition or add other alloying elements, Contractually agreed.

Ball mill steel ball

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