阅读说明：本技术 调质型27SiMn耐磨钢板的生产方法 (production method of quenched and tempered 27SiMn wear-resistant steel plate ) 是由 邓建军 李�杰 陈起 龙杰 吕建会 张亚丽 任鑫磊 刘彦强 陈振业 张启远 谢向 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种调质型27SiMn耐磨钢板的生产方法,其包括轧制、淬火和回火工序；所述轧制工序：第一阶段开轧温度为1050～1150℃,晾钢厚度为钢板厚度+50mm；第二阶段开轧温度为880～930℃；轧后水冷,返红温度为400℃～600℃；所述淬火工序：淬火温度为850℃～880℃,保温时间为2～2.50min/mm,保温后水冷；所述回火工序：回火温度为350～450℃,保温时间为2.5～3.0min/mm,保温后空冷,即可得到所述的耐磨钢板。本方法采用控轧+离线亚温淬火+离线回火的工艺,获取均匀细小的组织结构,从而确保所生产钢板具有优良的综合力学性能。本方法所得调质型27SiMn耐磨钢板厚度为8～110mm,具有强度适中、-20℃低温冲击韧性优良、硬度均匀的特点。(The invention discloses a production method of a quenched and tempered 27SiMn wear-resistant steel plate, which comprises the working procedures of rolling, quenching and tempering; the rolling process comprises the following steps: the first stage is that the initial rolling temperature is 1050-1150 ℃, and the steel airing thickness is the sum of the thickness of a steel plate and 50 mm; the second stage rolling temperature is 880-930 ℃; water cooling is carried out after rolling, and the temperature of red returning is 400-600 ℃; the quenching step comprises: quenching temperature is 850-880 ℃, heat preservation time is 2-2.50 min/mm, and water cooling is carried out after heat preservation; the tempering process comprises the following steps: tempering temperature is 350-450 ℃, heat preservation time is 2.5-3.0 min/mm, and air cooling is carried out after heat preservation, so that the wear-resistant steel plate can be obtained. The method adopts the processes of controlled rolling, offline sub-temperature quenching and offline tempering to obtain a uniform and fine tissue structure, thereby ensuring that the produced steel plate has excellent comprehensive mechanical properties. The thickness of the quenched and tempered 27SiMn wear-resistant steel plate obtained by the method is 8-110 mm, and the quenched and tempered 27SiMn wear-resistant steel plate has the characteristics of moderate strength, excellent low-temperature impact toughness at-20 ℃ and uniform hardness.)

1. a production method of a quenched and tempered 27SiMn wear-resistant steel plate is characterized by comprising the following steps: the method comprises the working procedures of rolling, quenching and tempering; the rolling process comprises the following steps: the first stage is that the initial rolling temperature is 1050-1150 ℃, and the steel airing thickness is the sum of the thickness of a steel plate and 50 mm; the second stage rolling temperature is 880-930 ℃; water cooling is carried out after rolling, and the temperature of red returning is 400-600 ℃;

The quenching step comprises: quenching temperature is 850-880 ℃, heat preservation time is 2-2.50 min/mm, and water cooling is carried out after heat preservation;

The tempering process comprises the following steps: tempering temperature is 350-450 ℃, heat preservation time is 2.5-3.0 min/mm, and air cooling is carried out after heat preservation, so that the wear-resistant steel plate can be obtained.

2. The method for producing the quenched and tempered 27SiMn wear-resistant steel plate according to claim 1, characterized in that: in the rolling procedure, the compression ratio of the blank and the steel plate is more than or equal to 3.

Technical Field

the invention belongs to the technical field of metallurgy, and particularly relates to a production method of a quenched and tempered 27SiMn wear-resistant steel plate.

Background

The 27SiMn steel plate belongs to high-carbon high-silicon steel, and is widely applied to manufacturing of key parts of engineering machinery such as mines, coal mines, metallurgy and the like. In China, the order is usually made in a hot rolling state, and when equipment is manufactured, a workpiece needs to be subjected to oil quenching and tempering treatment so as to obtain higher strength and hardness and meet the requirement of equipment manufacturing. This hot rolled state ordering scheme not only extends the manufacturing cycle of the facility, but also results in a significant increase in cost.

Disclosure of Invention

The invention aims to provide a production method of a high-performance quenched and tempered 27SiMn wear-resistant steel plate.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the method comprises the working procedures of rolling, quenching and tempering; the rolling process comprises the following steps: the first stage is that the initial rolling temperature is 1050-1150 ℃, and the steel airing thickness is the sum of the thickness of a steel plate and 50 mm; the second stage rolling temperature is 880-930 ℃; water cooling is carried out after rolling, and the temperature of red returning is 400-600 ℃;

The quenching step comprises: quenching temperature is 850-880 ℃, heat preservation time is 2-2.50 min/mm, and water cooling is carried out after heat preservation;

the tempering process comprises the following steps: tempering temperature is 350-450 ℃, heat preservation time is 2.5-3.0 min/mm, and air cooling is carried out after heat preservation, so that the wear-resistant steel plate can be obtained.

In the rolling procedure of the invention, the compression ratio of the blank and the steel plate is more than or equal to 3.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention adopts the processes of controlled rolling, offline sub-temperature quenching and offline tempering to obtain a uniform and fine tissue structure, thereby ensuring that the produced steel plate has excellent comprehensive mechanical properties. The thickness of the quenched and tempered 27SiMn wear-resistant steel plate is 8-110 mm, and the quenched and tempered 27SiMn wear-resistant steel plate has the characteristics of moderate strength, excellent low-temperature impact toughness at-20 ℃ and uniform hardness; when subsequent equipment is manufactured, oil quenching and tempering treatment on the machined part are not needed, the manufacturing period of the equipment can be effectively shortened, and the production cost is reduced.

The steel plate obtained by the invention has a uniform and fine structure, so that the strength, hardness and low-temperature impact performance of the steel plate are ensured; the yield strength (Rp0.2) of the obtained steel plate is 900MPa to 1150MPa, the tensile strength (Rm) is more than or equal to 1100MPa, and the elongation A50 percent is more than or equal to 14 percent; the transverse impact energy of the obtained steel plate at the temperature of minus 20 ℃ is more than or equal to 20J; the Brinell hardness of the surface of the steel plate is 280-350 HBWW.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.