High-strength wear-resistant steel plate and preparation method thereof

Abstract

The invention relates to a high-strength wear-resistant steel plate and a preparation method thereof. The steel comprises the following chemical components in percentage by mass: 0.12 to 0.22 percent of C, 0.25 to 0.50 percent of Si, 1.10 to 1.80 percent of Mn, 0.025 to 0.055 percent of Als, 0.30 to 1.00 percent of Cr, 0.20 to 0.60 percent of Ni, 0.10 to 0.50 percent of Mo, 0.010 to 0.050 percent of Ti, 0.0010 to 0.0050 percent of B, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S and the balance of Fe and inevitable impurities. The invention also provides the preparation method of the steel grade. The wear-resistant steel of the invention has the advantages of rational design of the chemical components, no Nb and V component systems, simple rolling process, on-line quenching process, quick production rhythm and stable product performance and can be widely applied to mechanical equipment under various extremely severe working conditions.

Description

technical field [0001] The invention relates to a high-strength wear-resistant steel plate and a preparation method thereof, in particular to a method for preparing a high-strength wear-resistant steel plate by an online quenching process, and also to a heat treatment method for the wear-resistant steel, belonging to the field of low-alloy high-strength steel. Background technique [0002] Today, with the rapid development of science and technology and modern industry, the operating speed of mechanical equipment is getting higher and higher, and many workpieces and equipment fail rapidly due to wear and tear, resulting in material waste and economic losses that are quite alarming. According to statistics, the economic loss caused by the wear and tear of mechanical equipment and its parts accounts for about 4% of the total output value of the national economy. Therefore, solving wear and prolonging the service life of components has become the primary issue that needs to be c...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many patents for the manufacture of high-strength wear-resistant steel plates. Most of the production methods use micro-alloying elements to improve hardenability. After rolling, the steel plates are reheated off-line and then heat-treated to obtain the performance requirements of high-strength wear-resistant steel. In this type of method, the matrix grains of the steel plate grow significantly after reheating, which affects the performance of the steel plate, so more alloy element content is required to meet the performance requirements. At the same time, the off-line quenching process requires repeated heating in the process, which has the disadvantage of high production costs.

For example, published on June 10, 2009, the patent application number is 200710193075.6, the name is "a quenched and tempered wear-resistant steel and its heat treatment method", the chemical composition of the patent is C 0.14-0.18%, Si 0.20-0.40% by mass , Mn 1.20-1.40%, P≤0.015%, S≤0.005%, Ni 0.40-0.55%, Cr 0.50-0.70%, Mo 0.40-0.50%, Nb 0.02-0.03%, V 0.04-0.55%, A10.020 -0.045%, Ti 0.015-0.030%, B 0.0015-0.0030%, this patent adopts controlled rolling + quenching and tempering treatment, the strength, plasticity and toughness are all low, but a certain amount of Nb and V are added, and it belongs to offline quenching+ Tempering treatment, more alloying elements and more processes make the cost higher

Published on March 24, 2010, the patent application number is 200810200029.9, and the name is "high-strength martensitic wear-resistant steel and its production process". The plasticity is poor, which is mainly because the martensite structure after quenching is unstable, and a large internal stress remains in the system, which leads to poor plasticity, and tempering is mainly to make the unstable structure obtained by quenching Transform into a stable structure, reduce the quenching stress and improve the plasticity and toughness of the wear-resistant steel, so that the wear-resistant steel has high hardness and wear resistance after quenching. At the same time, the patent mentions the use of controlled rolling. Finish rolling can only be done when it is warm, which greatly affects the rolling production rhythm

[0005] The first issue published in "China Foundry Equipment and Technology" in 2004 is titled "New Wear-resistant Cast Steel for the Production of Crusher Hammers". The design of the wear-resistant steel composition involved has high C and Mn contents. Severe segregation is very easy to occur in production, which affects the good microstructure and properties of wear-resistant steel. If casting slabs are produced by die casting, it will greatly affect the production rhythm and increase the production cost.

[0006] Patent No. ZL200380103628.4, ZL200380103647.7 and ZL200380103648.1 involve processes and plates, which have the disadvantages of adding Nb and V microalloying elements and high cost

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