High-performance low-carbon Mo-containing bainite steel and preparation method thereof

Abstract

The invention relates to high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of adding Mo into smelting components of Fe-C-Mn-Si low-carbon steel, smelting in vacuum, casting into a steel billet, and rolling the steel billet into a plate; heating the rolled plate to 880-900 DEG C at the heating speed of 5-10 DEG C / s, and keeping the temperature for 10-20 minutes; cooling to 410-420 DEG C by water, cooling to 340-350 DEG C by air, and keeping the temperature for 30-40 minutes; cooling to room temperature by water to prepare the high-performance low-carbon Mo-containing bainite steel. The high-performance low-carbon Mo-containing bainite steel comprises the following chemical components: 0.15wt%-0.22wt% of C, 1.48wt%-1.55wt% of Si, 1.95wt%-2.04wt% of Mn, 0.14wt%-0.15wt% of Mo, less than 0.008wt% of P, less than 0.002wt% of S, less than 0.004wt% of N and the balance of Fe and inevitable impurities. The preparation method has the characteristics of low cost, short cycle and simple process; the prepared high-performance low-carbon Mo-containing bainite steel is excellent in comprehensive performance.

Description

technical field

[0001] The invention belongs to the technical field of high-performance low-carbon bainite steel. In particular, it relates to a high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. Background technique

[0002] High-performance low-carbon bainitic steel is mainly used in construction machinery, marine facilities, bridges, automobiles, shipbuilding and pressure vessels. With the development of science and technology and economy, the requirements for its strength and toughness are increasing. Most of the existing low-carbon bainitic steels are added with a large amount of alloying elements, such as Nb, Ti, Ni, B, etc., some of which are expensive and increase the production cost; in addition, the production process of the existing low-carbon bainitic steels Most of them adopt relaxation precipitation phase transformation technology or long-time isothermal treatment process. Although these technologies can obtain high-stren...