Abstract
The precipitation of TiN inclusion during solidification of different carbon content of 0.72%, 0.82% and 0.95% in tire cord steel is thermodynamically studied respectively. The results show that the carbon content has obvious effect on TiN inclusion precipitated in tire cord steel of different strength levels. With the carbon content of tire cord steel increasing, the temperature before solidifying reduced gradually and the required activity product of titanium and nitrogen for TiN inclusion precipitation also declined gradually. With the same condition of initial Ti and N content in liquid steel, the size of TiN inclusion precipitated in tire cord steel of higher carbon content is bigger than that of lower carbon content. In order to control the harmful effects on processability of TiN inclusion precipitated in hypereutectoid tire cord steel of the ultra high strength level, the measures of smelting process must be taken to further reduce the titanium and nitrogen content in liquid steel.
Highlights
The results show that the carbon content has obvious effect on TiN inclusion precipitated in tire cord steel of different strength levels
In order to control the harmful effects on processability of TiN inclusion precipitated in hypereutectoid tire cord steel of the ultra high strength level, the measures of smelting process must be taken to further reduce the titanium and nitrogen content in liquid steel
The tire cord steel is a kind of high carbon steel, which is used for the production of car tyres meridian steel wire
Summary
The tire cord steel is a kind of high carbon steel, which is used for the production of car tyres meridian steel wire. With the car lightening and considering the safety of the car, the strength level of car tyre cord steel wire is improving. In order to control the harmful effects of titanium inclusion in hypereutectoid tire cord steel on the drawing performance of wire rod, steelmakers should take tough measures of steelmaking and refining technology to remove the content of Ti and N in the molten steel to the limit as much as possible. In order to provide theoretical guidance to control TiN inclusion precipitated in the hypereutectoid tire cord steel of the ultra high strength level, the effect of carbon content on Ti inclusion precipitated in tire cord steel of different intensity levels is studied on the basis of thermodynamics in this paper
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