High-strength and high-toughness steel for rock drilling tools and production method thereof

Abstract

The invention discloses high-strength and high-toughness steel for rock drilling tools and a production method thereof. The high-strength and high-toughness steel for the rock drilling tools is prepared from the chemical compositions in percentage by mass: 0.18%-0.24% of C, 0.80%-1.20% of Si, 2.30%-2.60% of Mn, less than or equal to 0.30% of Cr, 0.30%-0.40% of Mo, less than or equal to 0.30% of Ni, 0.06%-0.12% of V, 0.010%-0.040% of Al, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.0050%-0.0080% of N and the balance of Fe and inevitable impurities. Without the addition of a precious alloy Ni and a low hardenability element Cr, the strength, impact toughness and hardenability of the steel for the rock drilling tools are significantly increased by increasing the content of Si, Mn, Mo, V and other alloying elements, and the requirements of the rock drilling tools in low cost, good forging performance, high hardenability, high strength and high toughness are met.The process of "smelting + continuous casting + continuous rolling"is adopted, the production process is simple, the tensile strength of the product is more than or equal to 1450 Mpa and the impact Aku2 is more than or equal to 60 J, and the characteristics of low cost, simple process and stable product performance are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a high-strength and high-toughness steel for rock drilling tools and a production method thereof. Background technique [0002] With the rapid development of my country's economic construction, the demand for rock drilling tools in construction engineering fields such as ore mining, foundation construction, energy construction, and traffic road development is increasing. Rock drilling tools are very critical mechanical parts in the field of engineering construction. The quality of drilling tools determines the progress and work efficiency in the construction process. Therefore, higher requirements are put forward for the performance and quality of drilling tools. During the rock drilling process, the drilling tool itself bears huge impact, torsion and external wear, and the working conditions are very harsh, which makes the drilling tool a vulnerable and consumable product. A...

AI Technical Summary

Problems solved by technology

Most rock drilling tools use medium-high carbon steel, which has poor forging performance, resulting in low impact toughness and short service life of rock drilling tools. However, the steel of rock drilling tools with excellent performance uses a large amount of precious alloy Ni, and the cost is relatively high. high

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