Preparing method for high-tenacity low-alloy wear-resistant steel for bucket tooth

Abstract

The invention discloses a preparing method for high-tenacity low-alloy wear-resistant steel for a bucket tooth. The high-tenacity low-alloy wear-resistant steel comprises, by mass percent, 0.35%-0.45% of C, 1.20%-1.60% of Si, 1.00%-1.40% of Mn, 0.70%-0.90% of Cr, 0.15%-0.25% of Mo, 0.40%-0.60% of Cu, 0.05%-0.10% of Re, 0%-0.025% of P and 0%-0.025% of S. The preparing method comprises the steps that smelting is conducted, an alloy is smelted through an acid induction furnace, metal furnace burdens include steelmaking pig iron, steel scraps, ferromolybdenum and copper and are smelted to form molten steel, then, silicon iron, ferromanganese, ferrochromium and rare earth elements are added in a pouring ladle, and the smelted molten iron is poured in the pouring ladle to be poured; cooling is conducted, box opening is conducted for shakeout, and air cooling is conducted; thermal treatment is conducted, and a casting is subjected to austenitizing; quenching is conducted; carbon partition is conducted in a salt bath furnace; and the casting is placed in an insulating furnace to be subjected to bainite isothermal transformation, and finally the casting is taken out to be subjected to air cooling. The low-alloy wear-resistant steel composed of the above components and obtained through the smelting and thermal treatment technology is fine in internal grain structure, high in surface hardness, good in abrasion resistance, low in cost and capable of being widely applied to bucket tooth manufacturing.

Description

Technical field [0001] The invention relates to the technical field of steelmaking, in particular to a preparation method of high-strength toughness low-alloy wear-resistant steel for bucket teeth. Background technique [0002] Excavators are widely used in mining machinery, civil engineering, water conservancy engineering and municipal engineering, and bucket teeth are the key vulnerable parts of excavators. In recent years, with the rapid development of mining machinery and water conservancy projects, the use of excavators has also Increasing day by day, the consumption of bucket teeth increases rapidly. A large-scale water conservancy project or a medium-scale mine generally uses more than ten excavators at the same time and consumes up to one million tons of bucket teeth each year, worth more than one million yuan. The main function of the bucket teeth is to separate materials and protect the front wall of the forklift, and its working conditions are very harsh. When the ma...

AI Technical Summary

Problems solved by technology

When contacting the material, the rapid movement of the material causes the bucket teeth to be subjected to a strong impact, and the tip of the bucket tooth is worn by the strong impact and sliding of the material, usually various furrows, deformations, etc., and the surface is easy to fall off due to wear, so The life of bucket teeth is often very short and the consumption is huge

At the same time, the indirect economic losses caused by equipment damage, downtime and production stoppage are huge and cannot be counted. It can be seen that improving the impact toughness of excavator bucket teeth on the premise of ensuring the hardness of excavator bucket teeth will greatly improve the life of bucket teeth. , reduce costs and improve product quality has important economic significance