阅读说明：本技术 钒钢铸件处理方法 (Vanadium steel casting treatment method ) 是由 唐庆伟 童自谦 周黎明 俞卫松 于 2020-05-18 设计创作，主要内容包括：本申请公开了钒钢铸件处理方法,包括如下步骤,高温扩散退火阶段：在炉内将材料升温至980℃～1000℃,保温处理6h～10h,然后冷却,冷却至400℃时将材料取出炉进行空冷,并在材料温度不低于200℃的条件下进行切割；正火处理阶段：在炉内将材料升温至975℃～1005℃,保温处理12小时以上,然后用雾冷及空冷的方式对材料进行降温,待材料温度降至250℃以下；回火处理阶段：在炉内将材料升温至720℃～740℃,保温处理14小时以上,然后在炉内降温冷却,待温度降至300℃以下时出炉。本发明具有如下有益效果：只需经历高温扩散退火阶段、正火处理阶段以及回火处理阶段这三个阶段,耗时时间短,能耗低。(The application discloses a vanadium steel casting treatment method, which comprises the following steps of: heating the material to 980-1000 ℃ in a furnace, carrying out heat preservation treatment for 6-10 h, then cooling, taking the material out of the furnace for air cooling when the material is cooled to 400 ℃, and cutting under the condition that the temperature of the material is not lower than 200 ℃; and (3) normalizing treatment stage: heating the material to 975-1005 ℃ in a furnace, carrying out heat preservation treatment for more than 12 hours, and then cooling the material in a mist cooling and air cooling mode until the temperature of the material is reduced to below 250 ℃; and (3) tempering treatment stage: heating the material to 720-740 ℃ in a furnace, carrying out heat preservation treatment for more than 14 hours, then cooling in the furnace, and discharging when the temperature is reduced to below 300 ℃. The invention has the following beneficial effects: only three stages of high-temperature diffusion annealing, normalizing and tempering are needed, so that the time consumption is short and the energy consumption is low.)

1. A method for treating a vanadium steel casting is characterized by comprising the following steps,

and (3) high-temperature diffusion annealing stage: heating the material to 980-1000 ℃ in a furnace, carrying out heat preservation treatment for 6-10 h, then cooling, taking the material out of the furnace for air cooling when the material is cooled to 400 ℃, and cutting under the condition that the temperature of the material is not lower than 200 ℃;

and (3) normalizing treatment stage: heating the material to 975-1005 ℃ in a furnace, carrying out heat preservation treatment for more than 12 hours, then cooling the material in an air cooling mode after taking out of the furnace and carrying out fog cooling for 3 hours, and cooling the material to below 250 ℃;

and (3) tempering treatment stage: heating the material to 720-740 ℃ in a furnace, carrying out heat preservation treatment for more than 14 hours, then cooling in the furnace, and discharging when the temperature is reduced to below 300 ℃.

2. The method for treating vanadium steel castings according to claim 1, wherein the temperature rise rate in the high temperature diffusion annealing stage is not higher than 70 ℃/h.

3. The method for treating vanadium steel castings according to claim 1, wherein the furnace temperature reduction rate in the high temperature diffusion annealing stage is not higher than 70 ℃/h.

4. The method of treating vanadium steel castings according to claim 1, wherein the temperature rise rate in the normalizing treatment stage is not higher than 100 ℃/h.

5. The method for treating the vanadium steel casting according to claim 1, wherein the temperature rise rate during the temperature rise stage in the tempering treatment stage is not higher than 70 ℃/h, and the temperature drop rate during the temperature drop in the furnace is not higher than 70 ℃/h.

Technical Field

The invention relates to the field of castings, in particular to a vanadium steel casting treatment method.

Background

ZG17Cr1Mo1V is the main material for manufacturing turbine castings, the turbine castings manufactured by the material need to meet various mechanical property parameters, at present, the method for manufacturing the turbine castings by the material comprises the steps of firstly processing the turbine castings in a heating furnace at 990 ℃ for more than 10 hours, then cooling and cutting, processing the turbine castings at 990 ℃ for more than 12 hours after cutting, then cooling to below 250 ℃, then raising the temperature, processing at 950 ℃ for more than 12 hours, cooling and then raising the temperature to 730 ℃ for more than 14 hours after processing. The treatment process is long in time consumption, high in energy consumption and low in production efficiency.

Disclosure of Invention

The invention provides a vanadium steel casting treatment method aiming at the problems.

The technical scheme adopted by the invention is as follows:

a method for treating a vanadium steel casting comprises the following steps,

and (3) high-temperature diffusion annealing stage: heating the material to 980-1000 ℃ in a furnace, carrying out heat preservation treatment for 6-10 h, then cooling, taking the material out of the furnace for air cooling when the material is cooled to 400 ℃, and cutting under the condition that the temperature of the material is not lower than 200 ℃;

and (3) normalizing treatment stage: heating the material to 975-1005 ℃ in a furnace, carrying out heat preservation treatment for more than 12 hours, then cooling the material in an air cooling mode after the material is taken out of the furnace and cooled for 3 hours, and cooling the material to below 250 ℃;

and (3) tempering treatment stage: heating the material to 720-740 ℃ in a furnace, carrying out heat preservation treatment for more than 14 hours, then cooling in the furnace, and discharging when the temperature is reduced to below 300 ℃.

According to the scheme, the whole material only needs to be subjected to three stages, namely a high-temperature diffusion annealing stage, a normalizing treatment stage and a tempering treatment stage, and compared with two normalizing treatments in the traditional treatment scheme, the method is short in time consumption and low in energy consumption.

Optionally, the temperature rise speed in the high-temperature diffusion annealing stage is not higher than 70 ℃/h.

Optionally, the cooling speed in the furnace in the high-temperature diffusion annealing stage is not higher than 70 ℃/h.

Optionally, the temperature rise speed in the normalizing treatment stage is not higher than 100 ℃/h.

Optionally, the temperature rise speed in the temperature rise stage in the tempering treatment stage is not higher than 70 ℃/h, and the temperature reduction speed in the furnace is not higher than 70 ℃/h.

The invention has the beneficial effects that: only three stages of high-temperature diffusion annealing, normalizing and tempering are needed, so that the time consumption is short and the energy consumption is low.

The specific implementation mode is as follows:

the present invention will be described in detail with reference to examples.