High chromium abrasion-proof cast iron abrasive disc and manufacturing method thereof

A technology of wear-resistant cast iron and manufacturing method, which is applied in the field of papermaking, can solve problems such as low hardness, easy fracture and peeling, and poor wear resistance, and achieve the effects of simple production process, improved mechanical properties, and reduced production costs

Inactive Publication Date: 2008-06-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbide contained in this invention is a continuous network of M 3 C-type carbide, low hardness, poor wear resistance, and easy to break and peel off during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] High chromium cast iron grinding discs are smelted in a 500 kg medium frequency induction furnace, and the manufacturing process steps are:

[0033] ① Mix and heat scrap steel, pig iron and ferrochrome. After the molten iron is melted, add ferromanganese first, and then add tungsten slag ferroalloy and vanadium slag ferroalloy;

[0034] ② After adjusting the ingredients in front of the furnace, raise the temperature to 1572°C, add 0.11% Al to the weight of the molten iron for deoxidation, and then take it out of the furnace;

[0035] ③Crush the rare earth magnesium alloy into small pieces with a particle size of less than 15mm, dry it below 200°C, place it at the bottom of the ladle, and use the method of pouring into the ladle to carry out compound modification treatment on the molten iron. In addition, ferroboron with a particle size of less than 5mm Cover with a thin steel sheet, when the molten iron is 1 / 3 to 1 / 2 out of the furnace, throw the coated ferroboron into ...

Embodiment 2

[0043] High chromium cast iron grinding discs are smelted in a 500 kg medium frequency induction furnace, and the manufacturing process steps are:

[0044] ① Mix and heat scrap steel, pig iron and ferrochrome. After the molten iron is melted, add ferromanganese first, and then add tungsten slag ferroalloy and vanadium slag ferroalloy;

[0045] ② After adjusting the composition in front of the furnace, raise the temperature to 1564°C, add 0.09% Al to the weight of the molten iron for deoxidation, and then take it out of the furnace;

[0046] ③Crush the rare earth magnesium alloy into small pieces with a particle size of less than 15mm, dry it below 200°C, place it at the bottom of the ladle, and use the method of pouring into the ladle to carry out compound modification treatment on the molten iron. In addition, ferroboron with a particle size of less than 5mm Cover with a thin steel sheet, when the molten iron is 1 / 3 to 1 / 2 out of the furnace, throw the coated ferroboron into ...

Embodiment 3

[0054] High chromium cast iron grinding discs are smelted in a 750kg intermediate frequency induction furnace, and the manufacturing process steps are:

[0055] ① Mix and heat scrap steel, pig iron and ferrochrome. After the molten iron is melted, add ferromanganese first, and then add tungsten slag ferroalloy and vanadium slag ferroalloy;

[0056] ② After adjusting the composition in front of the furnace, the temperature is raised to 1577°C, and 0.12% Al is added to the weight of the molten iron for deoxidation, and then it is released from the furnace;

[0057] ③Crush the rare earth magnesium alloy into small pieces with a particle size of less than 15mm, dry it below 200°C, place it at the bottom of the ladle, and use the method of pouring into the ladle to carry out compound modification treatment on the molten iron. In addition, ferroboron with a particle size of less than 5mm Cover with a thin steel sheet, when the molten iron is 1 / 3 to 1 / 2 out of the furnace, throw the ...

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Abstract

The invention relates to a high chromium abrasion-resistant cast iron grinding plate and the manufacturing method, which belongs to the paper making technology field. The invention comprises the following chemical compositions (weight percent): C is 2.0-3.5 percent, Cr is 22.0-28.0 percent, Mn is1.5-2.5 percent, Si is lower than 1.0 percent, W is0.25-0.60 percent, Nb is 0.03-0.12 percent, Ta is 0.01-0.04 percent, V is 0.10-0.25 percent, Ti is 0.08-0.15 percent, RE is 0.05-0.20 percent, B is 0.02-0.10 percent, Mg is 0.04-0.10 percent, and the residual is Fe and inevitable trace impurity. The grinding plate of the invention can be manufactured by adopting an electric furnace, the precoated sand mold casting is operated, the texture of the grinding plate is fine, the intensity is high, toughness is good, and the abrasion resistance and the corrosion resistance are good. The production process of the grinding plate is simple, the cost is low, the main raw material is chromium iron, and inexpensive tungsten slag ferro alloy and vanadium slag ferro alloy are added to be used as auxiliary alloying elements. The grinding plate of the invention is used, production efficiency of a pulp grinder can be improved, the pulp grinding cost is reduced, the physical property of finished paper is bettered, and the grinding plate has good economic and social efficiency.

Description

technical field [0001] The invention relates to various types of refiner grinding discs and a manufacturing method thereof, in particular to a high-chromium wear-resistant cast iron grinding disc and a manufacturing method thereof, belonging to the technical field of papermaking. Background technique [0002] The refining process is a very important link in the pulping and papermaking process, and it plays an extremely important role in improving various physical indicators of paper. The refiner consumes a lot of energy, accounting for almost 20% of the total energy consumption of the entire pulp and paper mill. In pulping, discs are very important parts and are easily damaged. Its life directly affects the production efficiency, quality and energy consumption of pulp. Therefore, in terms of material selection, the grinding disc must have good wear resistance and relatively good toughness. The wear of the grinding disc can be roughly divided into two forms. The first is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10D21D1/20C22C33/10C21C7/06B22D1/00B22D29/00C21D5/00
Inventor 符寒光雷永平李学艺
Owner BEIJING UNIV OF TECH
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