Aluminum ferroboron composite intermediate alloy and method of use thereof

Abstract

The invention relates to aluminum-boron-ferro compound master alloy and a method thereof, which belongs to the ferrous alloy technical field. The percent by weight of chemical composition is: Al: 10-30%, Mn: <=2.0%, B: 2-10%, P :< =0.1, S: <=0.1% and C :< =1.0%, the allowance is Fe, and a used technique thereof is to add molten steel in the late period. The adding method in the smelting process comprises following steps: deoxidizing the molten steel weakly at the rear of a convertor, refining work stations to finish deoxidation and desulfurization, then, controlling the content of the aluminum to the weight range of 0.01-0.030% according to the requirements of molten steel finished products, here, adding the aluminum-boron-ferro compound master alloy in a mode of lump materials, stirring for 5-20 minutes, when the temperature is 1550-1650DEG C, and taking steel ladles out of a refining station. The method of the invention has the advantages that the stability control of the component of boron in the boron micro-alloying process is prominently increased, the yielding rate of the boron is increased, the method of the invention can be used to smelt trace boron alloyed structural steel and in a thin slab continuous casting and continuous rolling assembly line to produce low-carbon aluminium sedation boron microalloy steel.

Description

technical field [0001] The invention relates to the technical field of iron-based alloys, and in particular provides an aluminum-boron-iron composite master alloy and a use method thereof. It is mainly suitable for smelting boron steel or boron microalloyed steel, especially for the production of hot-rolled low-carbon aluminum-killed boron microalloyed steel in thin slab continuous casting and rolling production lines. Background technique [0002] Boron is located in the second period of the periodic table of chemical elements and is the first element of group IIIA. Its melting point is 2000°C to 2600°C. It still maintains high chemical activity at steelmaking temperatures and has a strong relationship with oxygen and nitrogen. Strong affinity, and can combine with sulfur and carbon, but not as good as aluminum, titanium, zirconium. [0003] Boron can effectively deoxidize and denitrify in the steelmaking process, and essentially change the aging tendency caused by nitroge...

AI Technical Summary

Problems solved by technology

Simultaneously solve the problem of simple operation in boron microalloying process

[0016] Another object of the present invention is to broaden the application scope of boron element, utilize boron element segregation in the austenite grain boundary and its influence on suppressing ferrite nucleation and promoting grain growth to solve the problem of thin slab continuous casting and rolling production line. The problem of high yield strength in the production of low-carbon aluminum-killed boron micro-alloyed steel hot-rolled strip

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