Alloy material for excavator bucket teeth and preparation method of alloy material

Abstract

The invention relates to a preparation method of an alloy material for excavator bucket teeth. The method comprises the following steps: when scrap steel in a furnace accounts for half of the volume of a furnace, ferromolybdenum, ferrochromium and trace boron are added; after scrap steel smelting and slag removal, a proper amount of ferrosilicon and ferromanganese are added for preliminary deoxidation, deslagging is performed again, and molten steel is obtained; a sample is taken and tested in a laboratory to ensure composition of the molten steel reaches a target value, an aluminium wire is added for deoxidation, current is reduced after keeping for 3-5 min, a product is left to stand, and slagging off out of the furnace is performed; the molten steel is poured into a transfer ladle, and0.05%-0.1% of yttrium-based heavy rare earth is added with flow; a silico-calcium deoxidizing agent accounting for 0.23%-0.27% of the mass of the molten steel is added to the transfer ladle, slaggingoff out of the furnace is performed, pouring is started by covering with insulation cotton, initial pouring temperature is 1560-1580 DEG C, late pouring temperature is not lower than 1530 DEG C, and cooling is performed. By adding the yttrium-based heavy rare earth, transformation of primary austenite and austenite in eutectic in a cast condition to martensite is promoted, hardness and impact toughness are greatly improved as compared with the cast condition, the silico-calcium deoxidizing agent is adopted for deoxidation, the molten steel is purified deeply, and more pure molten steel is obtained.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to an alloy material for excavator bucket teeth and a preparation method thereof. Background technique [0002] At present, there are tens of thousands of excavators in service in my country, and the working objects of the bucket teeth are mainly ore, rock or sand, etc., and the working conditions are very harsh. During excavation operations, they are not only affected by sliding wear but also subjected to certain impact loads. Therefore, The service life of the bucket teeth is greatly shortened, and it becomes the most consuming wearing part. [0003] Chinese patent application number 201110027201.7 invented a tubular welding wire for wear-resistant repair of construction machinery bucket teeth. The welding deposit layer has good wear resistance, crack resistance, and high impact toughness. During use, the material is affected by impact. With a high density of dislocations,...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned technology for improving the wear resistance of bucket teeth, whether using wear-resistant cast steel or hard alloy materials, or adopting the method of cladding wear-resistant coatings to improve the wear resistance of bucket teeth, although it can significantly improve the wear resistance of bucket teeth. service life, but the manufacturing process of bucket teeth is complicated, the procedures are cumbersome, and the production capacity of production enterprises is greatly limited; therefore, a high-performance alloy material is needed to reduce the subsequent manufacturing process, and at the same time meet the performance of all aspects and extend the bucket teeth. service life