Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel

Abstract

The invention provides steel-smelting complex deoxidizing agent- calcium-aluminium- ferrum alloy. It is to solve problems of great loss of aluminium during deoxidation process, low effective component content, bad utilization rate and large consumption, easy secondary oxidation and Al2O3 generation. The alloy comprises aluminium 20- 70%, calcium 1- 10% and left is ferrum and inevitable foreign substance. The manganese 1- 20%, silicon 1- 20% and titanium 1- 5% can be added into said alloy to prevent alloy efflorescence and increase steel alloy element. The invention is characterized by high deoxidation efficiency, lowered foreign substance content in steel, smooth steel smelting process, improved steel quality and reduced cost.

Description

technical field

[0001] The invention is an aluminum-calcium-iron alloy used for deoxidation in steelmaking. technical background

[0002] In steelmaking, impurities such as oxygen and sulfur in molten steel must be removed to ensure the cleanliness of molten steel in order to improve the quality of steel. Deoxidation in steelmaking is mainly done with additive deoxidizers. The main material for deoxidation is aluminum and aluminum-based composite alloys. Aluminum and aluminum-based composite alloys have large burning losses during the deoxidation process, low active ingredients, poor utilization rates, and large additions. At the same time, it is easy to secondary oxidation to produce Al 2 o 3 Inclusions often cause water blocking. Among the deoxidizing elements, calcium is equivalent to aluminum, and it has desulfurization effect. But due to its light specific gravity (1.54g / cm 3 ), flammable (melting point 850°C), cannot be used directly in steelmaking. Contents of ...