Dipper tooth material

Abstract

The invention discloses a dipper tooth material, comprising the following components by weight percentage: 1.5-2.2% of chromium, 1.0-1.7% of silicon, 0.8-1.5 % of manganese, 0.10-0.40% of molybdenum, 0.22-0.28% of carbon, 0.03-0.07% of aluminum, and iron being the rest. Compared with previous material, the dipper tooth material of the invention is improved substantially in terms of overall mechanical properties such as intensity and toughness, thus, to a certain degree, solving the problem of the existing product that fracture occurs due to insufficient intensity and roughness of the material when in use, thereby improving technical quality and level of the product. In addition, after numerous tests, the dipper tooth produced by the material of the invention witnesses no fracture, thus meeting the requirements of the market on high-strength and high tenacity dipper tooth.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a shovel tooth material. Background technique [0002] Shovel teeth are important basic accessories of construction machinery excavators. Due to the harsh service environment conditions, they are required to have ultra-high strength and toughness. However, in actual use, they often fail due to insufficient strength and toughness, which directly affects the reliability of the machine. , Efficiency has a significant impact. [0003] The high-strength and toughness shovel tooth materials currently in use at home and abroad generally include: CrMnSi series, CrNiMo series, and CrMnSiNiMo series. Add to. However, the actual working force of the shovel teeth is in the form of multiple impacts with small energy. The assessment of multiple impacts with small energy is the fatigue strength of components and materials. Therefore, the toughness should be improved first on the premi...

AI Technical Summary

Problems solved by technology

[0004] Since the shovel teeth require high strength and high impact toughness, the impact toughness has been mentioned as the most important position in recent years, and the impact toughness index (akv) that the shovel teeth can achieve at home and abroad are all in the range of 20-25J / cm 2 Between, and the actual product market requirements have been as high as 30J / cm 2 Above, the main reason for the insufficient strength of the shovel tooth section is that the hardness gradient from the surface to the core is too steep, and the hardenability of the material is insufficient. At the same time, the excessive non-martensitic structure of the shovel tooth section and the decrease in impact toughness are also one of the main reasons for fracture.

[0005] Therefore, the shovel tooth materials in the prior art cannot meet the use requirements in terms of strength and toughness, and research on shovel tooth materials with high strength and high toughness has become an inevitable development trend

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