The document provides an overview of chromium alloy casting balls used in various industries, highlighting their high surface hardness, low abrasion loss, and durability. It details the production process, including smelting, casting, and tempering, as well as the chemical compositions and mechanical properties of high, medium, and low chromium alloy casting balls. Additionally, the document lists specifications and the impact on production capacity and cost in ball mill applications.

1. Ball Mill Casting Ball
Chromium Alloy Casting Ball
Product Description
Chromium alloy casting ball is widely used in the industries of powder making and superfine
processing, such as cement, metal mine, coal slurry thermal power, chemical engineering, ceramic
material, papermaking, magnet material, etc. The surface hardness of high chromium alloy casting
ball can reach 65HRC, while the surface hardness of low chromium alloy casting ball can reach
45HRC at least.
Moreover, it has the advantages of average distribution of hardness, low abrasion loss, high tenacity,
and low rupture rate. The production quality is high than the requirement of Standard
GB/T17445-2009, so the casting balls are never out of shape and out of round.
Chromium alloy casting balls can effectively increase the specific surface area of cement and
concentrate recovery rate. Meanwhile, it also improves the production capacity of ball mill, prolongs
the service life of lining plate, and finally reduces the operating cost.
Production Process
Medium-frequency electric furnace makes the quality of steel scrap, chromium alloy and other alloy
materials to the process of smelting and micro-alloying. The following processes are casting molding
and tempering. Constant temperature casting ensures the products without sand, porosity, collapse
and other quality defects. The oil quenching process, which includes the quenching and tempering,
changes the internal structure to further enhance the mechanical properties, and reduces the internal
stress to control the rupture rate. In the steps of before the smelting, after the smelting, semi-finished
product and finished product, it adopts the advanced spectral detection to ensure the chemical

2. composition and stable performance.
Category and Technical Parameters
According to the differences of chemical composition, chromium alloy casting ball divides into three
types: high chromium alloy casting ball, medium chromium alloy casting ball and low chromium
alloy casting ball.
1. High chromium alloy casting ball
Chemical composition
Name
Chemical composition（%）
C Si Mn Cr Mo Cu P S
Common high
chromium alloy
casting 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 alloy
casting 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 Microstructure
Name
Surface hardness
（HRC）
Impact value
（J/cm2
）
Microstructure Falling ball impact fatigue life
High chromium
alloy casting ball
≥58 ≥4 M+C+A
≤φ80 ≥15000
≥φ80 ≥10000
M- martensite C-carbide A- retained austenite
Specification
Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）
Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）
φ30 0.11 9091 φ90 2.90 345

3. φ40 0.25 3891 φ100 4.00 250
φ50 0.50 2000 φ110 5.30 188
φ60 0.86 1153 φ120 6.80 147
φ70 1.37 729 φ130 7.70 129
φ80 2.05 487 φ140 8.74 114
Note: For the above products to adjust the chemical composition or increase other alloying elements,
it shall be remarked.
2. Medium chromium alloy casting ball
Chemical composition
Name
Chemical composition（%）
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 Microstructure
Name
Surface hardness
（HRC）
Impact value
（J/cm2
）
Microstructure Falling ball impact fatigue life
Medium
chromium alloy
casting ball
≥47 ≥3 P+C
≤φ80 ≥15000
≥φ80 ≥10000
P-pearlite C-carbide
Specification
Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）
Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）

4. φ30 0.11 9091 φ90 2.90 345
φ40 0.25 3891 φ100 4.00 250
φ50 0.50 2000 φ110 5.30 188
φ60 0.86 1153 φ120 6.80 147
φ70 1.37 729 φ130 7.70 129
φ80 2.05 487 φ140 8.74 114
Note: For the above products to adjust the chemical composition or increase other alloying elements,
it shall be remarked.
3. Low chromium alloy casting ball
Chemical composition
Name
Chemical composition（%）
C Si Mn Cr Mo Cu P S
Low chromium
alloy casting 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 Microstructure
Name
Surface hardness
（HRC）
Impact value
（J/cm2
）
Microstructure Falling ball impact fatigue life
Low chromium
alloy casting ball
≥45 ≥2.5 P+C ≥10000
P-pearlite C-carbide
Specification

5. Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）
Specification
（mm）
Unit weight
（kg）
Quantity
（pc/t）
φ30 0.11 9091 φ90 2.90 345
φ40 0.25 3891 φ100 4.00 250
φ50 0.50 2000 φ110 5.30 188
φ60 0.86 1153 φ120 6.80 147
φ70 1.37 729 φ130 7.70 129
φ80 2.05 487 φ140 8.74 114
Note: For the above products to adjust the chemical composition or increase other alloying elements,
it shall be remarked.
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