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Introduction of Cr Mn w wear ball
Our main products of wear-resistant materials are: chromium manganese tungsten wear-resistant cast iron steel ball, high (medium, low) chromium alloy steel ball and wear-resistant alloy lining plate, etc.
The products are widely used in cement building materials, metal mines, coal slurry thermal power, chemical engineering and other industries for powder preparation and ultra-fine deep processing. The products have high hardness, low wear, good toughness, broken and less. In the process of use, the surface hardness of the ball needs to be further improved, the wear resistance is enhanced, the production capacity of the mill is improved, the specific surface area of cement and the recovery rate of concentrate are improved.
The product has good shape, size and distribution, can protect the hard martensite matrix well, and the wear is uniform, and the rate of out of round and broken ball is very low.
1、 Metallographic structure
Carbide + martensite
2、 Mechanical properties
Rockwell hardness: ≥ 58hrc
Impact toughness: 4-7j / cm
Bending strength: 760 - 940n / mm
3、 Product features
1. The ball breaking rate was less than 1%.
2. Small deformation, low out of round rate, can reduce the number of times to stop and change grinding ball
3. Ball consumption: wet grinding: Ball consumption is generally one fourth to one third of low chromium ball
Dry grinding: Ball consumption is generally half of ordinary high chromium ball.
4. The chemical composition of medium frequency electric furnace is more stable than that of cupola.
5. The appearance and internal quality of metal mold casting are better than sand mold.
6. High temperature quenching (increasing hardness) and low temperature tempering (reducing brittleness) are adopted for heat treatment, and the final metallography is tempered martensite plus carbide.
7. Grinding treatment: all grinding balls with a diameter of more than 40mm are polished to make the surface free of burr, so as to reduce the ball crushing and the loss of lining plate.
technical parameter
Chemical Compostion(%)
Brand | C | W | Si | Mn | S | P | Cr | Mo | Cu | Ni | V | B | surface hardness |
ZQCr26 | ≥2.00 | appropriate amount | ≤1.20 | appropriate amount | ≤0.06 | ≤0.01 | >19.00 | ≤1.00 | ≤1.00 | ≤1.00 | appropriate amount | appropriate amount | ≥58 |
Ball Cost
Material type | High hardness ore | Medium hardness ore | Low hardness ore | Coal (high ash) | Coal (low ash) | Cement clinker |
Ball cost | 300-400g | 200-300g | 50-200g | 80-150g | 50-80g | 10-30g |
Serbice lifetime
Low chromium cast iron ball | Medium manganese bainite nodular cast iron balls | High chromium cast iron ball |
3-5 times | 3-3.5 times | 1.5-2.5 times |
Product Specification
Ball milling diameter | 20 | 25 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | |||||||
Diameter and length of grinding section | 16×16 | 20×20 | 20×25 | 25×30 | 30×35 | 35×40 | 40×45 | 45×50 | ||||||||||||
Technical test
After selecting chromium manganese tungsten wear-resistant cast iron grinding balls that meet the requirements of wear resistance and grading performance, the tests were carried out on the D coal mill of unit 3 in a power plant in December 2010, and according to the test results of unit 3, the comprehensive tests were carried out on six coal mills of unit 4 in June 2011. Through the test in the plant, the output of the mill, the quality of pulverized coal and the effect of energy saving have reached the expected goal, and the test is successful.
The output of the six mills and the fineness of pulverized coal meet the requirements of load variation and maximum output. Through the internal inspection of the mill, no abnormality was found in the mill and no damage was found in the liner.
time | Unit load MW | D mill current a | Output of mill d t / h | D coal feed T / h | E mill current a | Output of mill e t / h | E coal feed T / h | remarks |
2011-3-17-16:00 | 435 | 103 | 77 | 53 | 134 | 65 | 50 | The 4.2t current of mill e 3.13 with steel balls increased from 129 to 136a, and 0.2T was added on January 24, 2008 |
2011-3-17-17:00 | 428 | 103 | 73 | 57 | 134 | 42 | 32 | |
2011-3-17-18:00 | 431 | 102 | 70 | 46 | 133 | 45 | 25 | |
2011-3-17-19:00 | 424 | 103 | 68 | 44 | 134 | 50 | 42 | |
2011-3-17-20:00 | 401 | 103 | 70 | 48 | 134 | 46 | 50 | |
2011-3-17-21:00 | 420 | 102 | 70 | 46 | 134 | 50 | 41 | |
2011-3-17-22:00 | 420 | 102 | 74 | 50 | 135 | 51 | 42 | |
2011-3-17-23:00 | 426 | 102 | 71 | 48 | 135 | 47 | 40 | |
2011-3-17-24:00 | 412 | 102 | 71 | 48 | 135 | 47 | 39 |
Technical evaluation
Through operation inspection, the average running current of the third mill is about 105a, and the other grinding operation current is about 140A, and the average energy saving of 25% can save 300 degrees / hour. Each mill saves about 600000 energy (4800 hours of annual utilization and 0.4 yuan / degree of electricity price). 6 mills per furnace are RMB 3.6 million.
The wear-resistant ball consumption of the mill is 84.836g/t coal, and the steel ball consumption of each furnace is 122.2 tons per year, and the converted operation cost is about 1.71 million yuan. The average ball consumption is 311.3g/t coal, and the annual operation cost of 448.3 tons of steel ball consumption per furnace is calculated as 2.2232 million yuan of annual operation cost saving of 522000 yuan.
Conclusion: the use of Cr Mn w anti-wear cast iron ball with uniform wear resistance, strong grading stability and high wear resistance can realize the small ball grinding system of coal mill in power plant by adopting proper grading of grinding ball and increasing the proportion of small ball in the mill. Compared with the ordinary ball, it can greatly reduce the current and power consumption of the mill, and reduce the ball consumption of the mill, which has obvious economic benefits.
To make the best product cost-effective, create the greatest material and spiritual wealth for ourselves, customers and society.
Instructions for use of wear resistant ball
In order to obtain the best effect of the product, please pay attention to:
1. During the first stroke of the new ball mill or the ball loading after the replacement of the lining plate of the ball mill, please add a certain amount of mineral material (about 1 / 2 of the ball volume) with the ball, so as to prevent the ball from surface spalling or ball crushing due to no material idling during startup.
2. When it is used for dry grinding material, such as clearing the bin and pouring the ball, please open the bin and cool it before pouring the ball, so as to avoid the hot ball cracking due to the sudden drop of temperature when it meets the wet and cold air.
3. When it is used for single-stage grinding, one-stage grinding or one bin grinding, please keep a certain amount of ore in the ball mill. Too little ore or too much ball will produce grinding ball, resulting in surface spalling or increasing ball crushing rate.
4. Please contact the marketing department of our company in time when there is abnormal phenomenon in the process of using this product.
Introduction of Cr Mn w wear ball
Our main products of wear-resistant materials are: chromium manganese tungsten wear-resistant cast iron steel ball, high (medium, low) chromium alloy steel ball and wear-resistant alloy lining plate, etc.
The products are widely used in cement building materials, metal mines, coal slurry thermal power, chemical engineering and other industries for powder preparation and ultra-fine deep processing. The products have high hardness, low wear, good toughness, broken and less. In the process of use, the surface hardness of the ball needs to be further improved, the wear resistance is enhanced, the production capacity of the mill is improved, the specific surface area of cement and the recovery rate of concentrate are improved.
The product has good shape, size and distribution, can protect the hard martensite matrix well, and the wear is uniform, and the rate of out of round and broken ball is very low.
1、 Metallographic structure
Carbide + martensite
2、 Mechanical properties
Rockwell hardness: ≥ 58hrc
Impact toughness: 4-7j / cm
Bending strength: 760 - 940n / mm
3、 Product features
1. The ball breaking rate was less than 1%.
2. Small deformation, low out of round rate, can reduce the number of times to stop and change grinding ball
3. Ball consumption: wet grinding: Ball consumption is generally one fourth to one third of low chromium ball
Dry grinding: Ball consumption is generally half of ordinary high chromium ball.
4. The chemical composition of medium frequency electric furnace is more stable than that of cupola.
5. The appearance and internal quality of metal mold casting are better than sand mold.
6. High temperature quenching (increasing hardness) and low temperature tempering (reducing brittleness) are adopted for heat treatment, and the final metallography is tempered martensite plus carbide.
7. Grinding treatment: all grinding balls with a diameter of more than 40mm are polished to make the surface free of burr, so as to reduce the ball crushing and the loss of lining plate.
technical parameter
Chemical Compostion(%)
Brand | C | W | Si | Mn | S | P | Cr | Mo | Cu | Ni | V | B | surface hardness |
ZQCr26 | ≥2.00 | appropriate amount | ≤1.20 | appropriate amount | ≤0.06 | ≤0.01 | >19.00 | ≤1.00 | ≤1.00 | ≤1.00 | appropriate amount | appropriate amount | ≥58 |
Ball Cost
Material type | High hardness ore | Medium hardness ore | Low hardness ore | Coal (high ash) | Coal (low ash) | Cement clinker |
Ball cost | 300-400g | 200-300g | 50-200g | 80-150g | 50-80g | 10-30g |
Serbice lifetime
Low chromium cast iron ball | Medium manganese bainite nodular cast iron balls | High chromium cast iron ball |
3-5 times | 3-3.5 times | 1.5-2.5 times |
Product Specification
Ball milling diameter | 20 | 25 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | |||||||
Diameter and length of grinding section | 16×16 | 20×20 | 20×25 | 25×30 | 30×35 | 35×40 | 40×45 | 45×50 | ||||||||||||
Technical test
After selecting chromium manganese tungsten wear-resistant cast iron grinding balls that meet the requirements of wear resistance and grading performance, the tests were carried out on the D coal mill of unit 3 in a power plant in December 2010, and according to the test results of unit 3, the comprehensive tests were carried out on six coal mills of unit 4 in June 2011. Through the test in the plant, the output of the mill, the quality of pulverized coal and the effect of energy saving have reached the expected goal, and the test is successful.
The output of the six mills and the fineness of pulverized coal meet the requirements of load variation and maximum output. Through the internal inspection of the mill, no abnormality was found in the mill and no damage was found in the liner.
time | Unit load MW | D mill current a | Output of mill d t / h | D coal feed T / h | E mill current a | Output of mill e t / h | E coal feed T / h | remarks |
2011-3-17-16:00 | 435 | 103 | 77 | 53 | 134 | 65 | 50 | The 4.2t current of mill e 3.13 with steel balls increased from 129 to 136a, and 0.2T was added on January 24, 2008 |
2011-3-17-17:00 | 428 | 103 | 73 | 57 | 134 | 42 | 32 | |
2011-3-17-18:00 | 431 | 102 | 70 | 46 | 133 | 45 | 25 | |
2011-3-17-19:00 | 424 | 103 | 68 | 44 | 134 | 50 | 42 | |
2011-3-17-20:00 | 401 | 103 | 70 | 48 | 134 | 46 | 50 | |
2011-3-17-21:00 | 420 | 102 | 70 | 46 | 134 | 50 | 41 | |
2011-3-17-22:00 | 420 | 102 | 74 | 50 | 135 | 51 | 42 | |
2011-3-17-23:00 | 426 | 102 | 71 | 48 | 135 | 47 | 40 | |
2011-3-17-24:00 | 412 | 102 | 71 | 48 | 135 | 47 | 39 |
Technical evaluation
Through operation inspection, the average running current of the third mill is about 105a, and the other grinding operation current is about 140A, and the average energy saving of 25% can save 300 degrees / hour. Each mill saves about 600000 energy (4800 hours of annual utilization and 0.4 yuan / degree of electricity price). 6 mills per furnace are RMB 3.6 million.
The wear-resistant ball consumption of the mill is 84.836g/t coal, and the steel ball consumption of each furnace is 122.2 tons per year, and the converted operation cost is about 1.71 million yuan. The average ball consumption is 311.3g/t coal, and the annual operation cost of 448.3 tons of steel ball consumption per furnace is calculated as 2.2232 million yuan of annual operation cost saving of 522000 yuan.
Conclusion: the use of Cr Mn w anti-wear cast iron ball with uniform wear resistance, strong grading stability and high wear resistance can realize the small ball grinding system of coal mill in power plant by adopting proper grading of grinding ball and increasing the proportion of small ball in the mill. Compared with the ordinary ball, it can greatly reduce the current and power consumption of the mill, and reduce the ball consumption of the mill, which has obvious economic benefits.
To make the best product cost-effective, create the greatest material and spiritual wealth for ourselves, customers and society.
Instructions for use of wear resistant ball
In order to obtain the best effect of the product, please pay attention to:
1. During the first stroke of the new ball mill or the ball loading after the replacement of the lining plate of the ball mill, please add a certain amount of mineral material (about 1 / 2 of the ball volume) with the ball, so as to prevent the ball from surface spalling or ball crushing due to no material idling during startup.
2. When it is used for dry grinding material, such as clearing the bin and pouring the ball, please open the bin and cool it before pouring the ball, so as to avoid the hot ball cracking due to the sudden drop of temperature when it meets the wet and cold air.
3. When it is used for single-stage grinding, one-stage grinding or one bin grinding, please keep a certain amount of ore in the ball mill. Too little ore or too much ball will produce grinding ball, resulting in surface spalling or increasing ball crushing rate.
4. Please contact the marketing department of our company in time when there is abnormal phenomenon in the process of using this product.
