High-strength abrasion-proof cast steel lining board and manufacturing method thereof

A manufacturing method and high-strength technology, applied in the field of metal wear-resistant materials, can solve the problems of high carbon content and easy cracking, and achieve the effects of less inclusions, simple production process and low production cost

Inactive Publication Date: 2008-05-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the carbon content is high, e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Melting molten steel with a 500 kg medium frequency induction furnace, the manufacturing process steps are:

[0021] ①Steel scrap, recarburizer and ferrochrome are mixed, heated and melted, and ferrosilicon and ferromanganese are added after molten steel is melted;

[0022] ② After adjusting the composition before the furnace, the temperature is raised to 1634°C, first adding aluminum deoxidizer, then adding a composite deoxidizer containing silicon, calcium, barium and aluminum, and then out of the furnace;

[0023] ③Crush ferrotitanium, ferroboron, and lanthanum-cerium mixed rare earth into small pieces with a particle size of less than 12mm. After drying at a temperature below 200°C, place them at the bottom of the ladle, and use the method of pouring into the ladle to carry out composite modification of molten steel;

[0024] ④ Cast the liner with a sand mold, and the pouring temperature is 1528°C;

[0025] ⑤ After pouring for 4 hours, open the box and air-cool the...

Embodiment 2

[0032] Melting molten steel with a 1000 kg medium frequency induction furnace, the manufacturing process steps are:

[0033] ①Steel scrap, recarburizer and ferrochrome are mixed, heated and melted, and ferrosilicon and ferromanganese are added after molten steel is melted;

[0034] ② After adjusting the ingredients before the furnace, the temperature is raised to 1624°C, first adding aluminum deoxidizer, then adding a composite deoxidizer containing silicon, calcium, barium and aluminum, and then out of the furnace;

[0035] ③Crush ferrotitanium, ferroboron, and lanthanum-cerium mixed rare earth into small pieces with a particle size of less than 12mm. After drying at a temperature below 200°C, place them at the bottom of the ladle, and use the method of pouring into the ladle to carry out composite modification of molten steel;

[0036] ④ Cast the liner with sand mold, and the pouring temperature is 1517°C;

[0037] ⑤ After pouring for 3 hours, open the box and air-cool the ...

Embodiment 3

[0044] Melting molten steel with a 750 kg medium frequency induction furnace, the manufacturing process steps are:

[0045] ①Steel scrap, recarburizer and ferrochrome are mixed, heated and melted, and ferrosilicon and ferromanganese are added after molten steel is melted;

[0046] ② After adjusting the ingredients before the furnace, raise the temperature to 1638°C, add aluminum for deoxidation first, then add a composite deoxidizer containing silicon, calcium, barium and aluminum, and then take it out of the furnace;

[0047] ③Crush ferrotitanium, ferroboron, and lanthanum-cerium mixed rare earth into small pieces with a particle size of less than 12mm, and after drying below 200°C, place it at the bottom of the ladle, and perform composite modification of molten steel by the method of pouring into the ladle;

[0048] ④ Cast the liner with sand mold, the pouring temperature is 1536°C;

[0049] ⑤ After pouring for 6 hours, unpack the air-cooled liner, remove the pouring riser, ...

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Abstract

The invention relates to a lining plate of cast steel with high strength and abrasion resistance and the fabrication method, belonging to the technical field of metal abrasion-resistant material. The chemical composition of the lining plate (in weight ratio) is that: 0.25 to 0.45 C, 1.0 to 2.0 Mn, 0.8 to 1.5 Cr, 0.003 to 0.008 B, 0.02 to 0.08 Al, 0.04 to 0.15 Ti, 0.02 to 0.10 La, 0.02 to 0.10 Ce, 0.02 to 0.08 Ba, 0.02 to 0.10 Ca and Fe and other inevitable micro impurity retaining; wherein, the sum of Si, Mn and Cr is more than 3.5 and lower than 4.5, while the sum of the La and Ce is more than 0.05 and lower than 0.18. The lining plate of cast steel can be fabricated with an electric stove and a method of sand sell molding. Therefore, the tensile strength of the lining plate is as high as to 1450 to 1600 MPa, the hardness reaches to 50 to 55 HRC; the abrasion resistance is good; and the impact toughness reaches 65 to 80 J/cm2. The lining plate can neither fracture nor peel in use, with much better service performance than the Mn13 high manganese steel lining plate. With the steel cuttings adopted as the main materials, the lining plate has the advantages of simple fabricating technique, low manufacturing cost, and can improve the operating efficiency of ball mill and lower the material-grinding cost, therefore is possessed with good economic benefit.

Description

technical field [0001] The invention relates to a high-strength wear-resistant cast steel liner and a manufacturing method thereof, belonging to the technical field of metal wear-resistant materials. Background technique [0002] Ball mills are widely used to grind materials in metallurgical mines, cement building materials, electric power, chemical fertilizers, coal, and chemical industries. The liner is the main consumable part in the ball mill, and its quality affects both the production rate of the mill and the grinding cost of the material. There are two main types of commonly used mill liner materials, one is austenitic high-manganese steel, which has high toughness and low original hardness. During use, it mainly relies on austenite work hardening to increase its hardness. Afterwards, its hardness is increased from the original HB200 to HB400-500, and it can be used under high impact load conditions to achieve good results, but under medium and small impact load condi...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/38C22C33/04C21C7/00B22D37/00B22D29/00C21D1/18C21D9/46
Inventor 符寒光雷永平
Owner BEIJING UNIV OF TECH
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