A preparation method of high-strength toughness low-alloy wear-resistant steel for bucket teeth

Abstract

The invention discloses a method for preparing high-strength toughness low-alloy wear-resistant steel for bucket teeth. The composition and mass fraction thereof are: C: 0.35-0.45%, Si: 1.20-1.60%, Mn: 1.00-1.40%, Cr: 0.70 ‑0.90%, Mo: 0.15‑0.25%, Cu: 0.40‑0.60%, Re: 0.05‑0.10%, P: 0‑0.025%, S: 0‑0.025%, the preparation methods include: melting: smelting in an acid induction furnace Alloy, metal charge includes pig iron for steelmaking, scrap steel, ferromolybdenum and copper, smelted into molten steel, then put ferrosilicon, ferromanganese, ferrochrome and rare earth elements into the ladle, and pour the molten steel into the ladle , pouring; cooling, unpacking and sand shakeout, and air cooling; heat treatment: austenitizing the casting; quenching; carbon partitioning in the salt bath furnace; putting it into the holding furnace for bainite isothermal transformation, and finally taking it out and air cooling. The low-alloy wear-resistant steel composed of the above-mentioned components of the present invention and prepared through smelting and heat treatment processes has fine internal grain structure, high surface hardness, good wear resistance and low cost, and can be widely used in 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 projects and municipal engineering, and bucket teeth are key vulnerable parts on excavators. In recent years, with the rapid development of mining machinery and water conservancy projects, the usage of excavators has also increased. Increasing day by day, the consumption of bucket teeth increases rapidly. A large-scale water conservancy project or a medium-sized mine generally uses more than ten excavators at the same time, and the annual consumption of bucket teeth is as high as one million tons, 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 ...

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