A device and method for simulating the formation of oxide film on the surface of thin strip continuous casting crystal roll

Abstract

The invention discloses a device for simulating oxide film generation on a thin-strip continuous casting crystallization roll and a method thereof. The device comprises a melting system, an atmospherecontrol system, a film collecting system, an oxygen partial pressure measuring instrument which is used for measuring the oxygen partial pressure in an induction furnace, and a temperature acquiringsystem which is connected with a thermocouple that is embedded into a substrate. The wall surface of the furnace body which corresponds with the upper part of a crucible is provided with an air curtain cover. The inside wall of the air curtain curve is provided with a plurality of gas holes which can eject protective gas for preventing contact between the protective atmosphere and outer air. The film collecting film comprises the substrate above a crucible, and a lifting mechanism which controls the substrate to lift. The substrate is internally provided with a cooling liquid pipe with a cooling medium. The device and the method can be used for simulating an oxide film generating process on the surface of a crystallization roll in actual double-roll thin-strip continuous casting and has high simulating performance and high economic performance. Furthermore the oxide deposited film formed on the substrate can be easily collected, thereby facilitating research of an oxide film forming mechanism and influence of the oxide film to heat transferring in a sub-quick solidification process.

Description

technical field [0001] The invention belongs to the technical field of sub-rapid solidification of metals, and in particular relates to a device and method for simulating the formation of an oxide film on the surface of a strip continuous casting crystal roll. Background technique [0002] In 1856, Bessemann tried to obtain the steel strip directly from molten steel in the factory. This is done by pouring molten steel between two water-cooled rollers to cast steel sheets. Due to the limitation of technology at that time, the further development of this method was limited. For a long time after that, someone proposed a ring rolling mill scheme. In 1940, the possibility of casting silicon steel and stainless steel was confirmed, but due to quality problems and unqualified technology, industrial production could not be realized. In the 1960s, Bethlehem Company and Oregon Branch in the United States, Uzinol Company in France, and Metal Materials Research Institute in Japan set...

AI Technical Summary

Problems solved by technology

At present, it is mainly to directly study the oxide film formed on the surface of the crystal roll of the pilot strip caster and the plant strip caster, but the cost of this method is high, and the experimental conditions are difficult to control

Therefore, someone has developed a laboratory thermal simulation device for laboratory-scale research. The document "The effect of surface oxidefilms on heat transfer behavior in the strip casting process" (P. Nolli, A. CRAMB et al., Iron & steel technology) is published A device for metal droplet method is developed. A small amount of metal with a certain mass in a quartz tube with a nozzle is melted to form a droplet by induction heating, and then the metal droplet falls on the water-cooled copper substrate by blowing argon gas, and finally on the substrate. A layer of oxide film is formed on the surface. This device can be used to study the formation process of oxidation and the influence on the interface heat transfer, but the amount of metal droplets is too small, and the method of dripping and solidification is difficult to simulate the actual metal liquid on the crystallization roller. subrapid solidification process

The invention patent with application number 201710271478.1 discloses an atmosphere-controlled metal interface film deposition device and its method. By inserting a water-cooled copper substrate into a steel molten pool, a layer of solidified steel shell is formed on the surface of the substrate, and then withdrawn from the molten pool. The oxide film deposited on the surface of the substrate can be obtained after cutting the solidified billet shell, and the oxidized components can be analyzed. However, due to the lack of thermocouples inside the substrate, it is impossible to study the influence of the oxide film on the interface heat transfer, and the furnace body lacks atmosphere measuring devices such as oxygen probes. , it is difficult to control the atmosphere of the experimental environment; at the same time, it is difficult for this device to truly simulate the sub-rapid solidification behavior of the metal inside the high-speed rotating crystallization roller in thin strip continuous casting

In addition, since the solidified slab shell is formed after one insertion, the oxide film cannot be deposited continuously for multiple times. The accuracy is a key technical problem to be solved urgently in the industry

Images