High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof

Abstract

The invention relates to high-strength-and-toughness low alloy wear resistant steel and a manufacturing method thereof, belonging to the technical filed of metallurgy. The high-strength-and-toughness low alloy wear resistant steel comprises the following components by weight percent: 0.15-0.20% of C, 0.1-0.5% of Si, 1.2-1.6% of Mn, less than or equal to 0.015% of P, less than or equal of 0.005% S, 0.02-0.04% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.16-0.22% of Mo, 0.001-0.0015% of B and the balance of Fe, and simultaneously the carbon equivalent Ceq (%) is less than or equal to 0.55. The manufacturing method comprises the following steps: smelting molten steel and pouring into a slab, and carrying out rough rolling after heating and heat insulation; and then carrying out complete quenching treatment, or sub-temperature quenching treatment, or carrying out the complete quenching treatment and then carrying out the sub-temperature quenching treatment, and adopting low temperature tempering to eliminate stress after the quenching. The method of the invention ensures higher hardness, simultaneously can obviously improve the impact toughness of steel plates, increase the impact resistance of the steel plates, and prolong the service life of mechanical equipment, and can obtain wear resistant steel plates with different strength and toughness grades by using the steel with same components and different quenching processing methods.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength, high-toughness low-alloy wear-resistant steel and a manufacturing method thereof. Background technique

[0002] Low-alloy wear-resistant steel is mainly used in mechanical equipment such as engineering, mining, construction, agriculture, cement production, ports, electric power and metallurgy with harsh working conditions, such as bulldozers, loaders, excavators, dump trucks and various mining machinery, etc. . Not only high strength and hardness are required to resist wear, but also a certain impact resistance is required. According to different conditions of use, users have different requirements for the performance of wear-resistant steel products. Wear-resistant steel plates with different hardness and toughness should be used to achieve the purpose of prolonging the service life of mechanical equipment. At present, the impact toughness of lo...

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