HB500 grade hot continuous rolling high strength wear-resisting steel and production method thereof

Abstract

The invention relates to HB500 grade hot continuous rolling high strength wear-resisting steel which comprises the components in percentage: 0.21-0.30% of C, less than or equal to 0.20% of Si, 0.8-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.10-0.40% of Mo, 0.050-0.20% of Ti, 0.0005-0.0030% of B and less than or equal to 0.0050% of N, wherein the condition is met that Ti / N is greater than or equal to 10, and Mo / Ti is greater than or equal to 2. The preparation method comprises the following steps: smelting and continuously casting to blanks; directly heating the blanks; continuously rolling; batching; finishing and cutting; heating and insulating by a thermal treatment furnace; quenching by a roller type quenching machine; performing water cooling to reach room temperature; and annealing at low temperature and air-cooling to room temperature. According to the invention, the production cost is lower, and the Brinell Hardness of the steel plate after thermal treatment reaches 480-520 and KV2 at minus 40 DEG C is greater than or equal to 30J. The steel plate is excellent in shape, and the inequality in the length direction is less than or equal to 13mm / 1000mm. The steel plate is good in cold roll forming performance.

Description

technical field [0001] The invention relates to wear-resistant steel and a production method thereof, in particular to HB500 hot continuous rolling high-strength wear-resistant steel and a production method thereof. Background technique [0002] Wear-resistant steel is a kind of wear-resistant material widely used in various wear conditions such as metallurgy, mining, building materials, electric power, railways and military affairs. It is currently one of the most important steel types in my country's construction machinery industry. In recent years, with the development of the manufacturing industry, thin-gauge high-strength wear-resistant steel has become a new demand direction. Due to the harsh working environment of wear-resistant steel, it is required to have sufficient hardness to resist wear, and at the same time have a certain degree of toughness to prevent impact damage. In addition, thin gauge high-strength wear-resistant steel must also ensure good shape and exce...

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of many metal elements, many added precious elements and high production cost in the prior art, to provide a method that can not only use less metal elements but also use precious elements under the premise of ensuring the mechanical properties such as hardness and strength of the steel plate. HB500 grade hot-rolled high-strength wear-resistant steel that is common elements except Mo and whose production cost can be reduced by 20% and its production method

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