A rolling method for controlling the grain size of stainless steel sheets for thermonuclear fusion reactors

Abstract

The invention belongs to a rolling method of steel plates, and particularly relates to a rolling method of the grain size of stainless steel plates used for controlling thermonuclear fusion reactors. The rolling method includes the steps of steel ingot heating, blooming, raw material plate heating, hot rolling and steel plate cooling. In the step of steel ingot heating, firstly, steel ingots are heated, the starting temperature of heating is 700 DEG C, the temperature is kept for 1-2 hours, and then the temperature is slowly raised to 900 DEG C; the 900 DEG C temperature is kept for 6-6.5 hours, then the temperature is continuously raised to be between 1200 DEG C and 1310 DEG C, and lastly, the temperature is kept between 1200 DEG C and 1310 DEG C for 3-4 hours. In the step of raw material plate heating, firstly, the starting temperature of heating is 700 DEG C, the temperature is kept for 1-1.5 hours, and then the temperature is raised to 900 DEG C; the 900 DEG C temperature is kept for 5-5.5 hours, then, the temperature is continuously raised to be between 1200 DEG C and 1310 DEG C, and lastly, the temperature is kept between 1200 DEG C and 1310 DEG C for a period of time. The rolling method has the advantages of enabling the grain size of the steel plates to be between grade 6 and grade 8 steadily though controlling the time duration of heat preservation in different stages and controlling the rolling process.

Description

technical field [0001] The invention belongs to a steel plate rolling method, in particular to a rolling method for controlling the crystal grain size of a stainless steel plate used in a thermonuclear fusion reactor. Background technique [0002] The ITER program (International Thermonuclear Experimental Reactor International Thermonuclear Experimental Reactor) is a new nuclear power experiment project participated by seven countries and regions including the European Union, the United States, China, Japan, Russia, India and South Korea. The quality requirements of the nitrogen-containing stainless steel plates are very high, not only the metallurgical quality requirements such as the chemical composition of the material are strict, but also the material's normal temperature, low temperature performance, performance difference, and macroscopic and microstructure. The microstructure of a material determines its performance, so whether an excellent microstructure can be obtai...

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Problems solved by technology

The steel plate produced by the existing die-casting manufacturing process, due to the unique process characteristics of die-casting (small reduction ratio), the heating temperature, final rolling temperature, deformation mode, and deformation amount of 316LN austenitic stainless steel plate cannot be controlled in the production process. When appropriate, the grain size of the finished product is generally coarse (generally 4~8) and cannot meet the requirements of the thermonuclear experimental reactor (the thermonuclear experimental reactor requires 6 or more)

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