Prevention of split crack of carbon in intermediate carbon and alloy structural steel ingot by adding titanium and process for producing same

Abstract

The invention discloses a titanium-adding technology in medium carbon and structural alloy steel slab to prevent diastema. The aim of the invention is to provide a process to use titanium as a substitute for aluminium in terminal deoxidization, ingoting and annealing process to prevent diastema The gross mass comprises 0.03%-0.06% of terminal deoxidization agent titanium and 0.02%-0.04% of terminal deoxidization agent aluminium. Ingoting and annealing process: no need to move forward to annealing process pit or hood for annealing process after more than 6-10 times the time when melted iron is injected into mould, demoulding and when steel slab surface temperature decreases to the temperature bellow 100 Deg. C warehousing-in after qualification test. Without demoulding and annealing in pit or hood just after congealing of milted iron, this invention prevents diastema of medium carbon and structural alloy steel slab, so it reduces intensity of labor, cancels pit or hood installation, more importantly it reduces diastema substantially and shortens period of production. This invention not only decreases capital loss but also guarantees quality.

Description

technical field [0001] The invention relates to metallurgical technology, and more specifically relates to the prevention of longitudinal cracking of medium-carbon carbon and alloy structural steel ingots and its production process. Background technique [0002] At present, the production of medium-carbon carbon and alloy structural steel ingots is to smelt solid raw materials into molten steel through an electric furnace, and finally add aluminum to deoxidize, and then pour into the ingot mold. After cooling for a long time, it can be out of the pit and the cover can be formed. In such a final deoxidation process, workers must operate beside the red-hot steel ingot, and the working conditions are poor. At the same time, certain sites and facilities must be provided. Although it is time-consuming, labor-intensive, and expensive, it cannot guarantee that the medium-carbon carbon and alloy structural steel ingots will not produce longitudinal cracks. Contents of the inventi...

AI Technical Summary

Problems solved by technology

Although it is time-consuming, labor-intensive and expensive, it cannot guarantee that the medium-carbon carbon and alloy structural steel ingots will not produce longitudinal cracks.