Six Factors Affecting The Absorption Rate Of Hollow Square Tube Alloys

The absorption rate of alloying elements, also known as the yield or recovery rate, refers to the percentage of the mass of alloying elements entering the steel to the total amount of alloying elements added. The type of steel being made, the type, quantity, and sequence of alloy additions, end-point carbon, operating factors, etc., all affect the alloy element absorption rate. The factors affecting the absorption rate of hollow square tube alloys can be summarized as the following six points:

(1) Add the deoxidizing agent with weak deoxidizing ability first, and then add the deoxidizing agent with strong deoxidizing ability. This can not only ensure that the deoxidation degree of the molten steel in the hollow square tube meets the requirements of the steel type but also facilitate the floating of the deoxidation products so that the quality meets the requirements of the steel type;

(2) The amount of molten steel and the absorption rate of alloy elements must be estimated accurately to ensure the stability of the composition of molten steel;

(3) In the low-carbon drawing process of square rectangular tube steel, the order of adding deoxidizer is: first strong and then weak. The practice has proved that reducing inclusions in steel can greatly improve and stabilize the absorption rate of elements, and accordingly reduce the amount of alloy. However, corresponding refining measures must be adopted;

(4) There are many alloy powders, with low density and low absorption rates. Different alloy elements have different absorption rates. The same alloy and different steel types have different absorption rates;

(5) In order to obtain fine-grained steel, the aluminum content in steel should reach 0.02%-0.05%. For this reason, the amount of aluminum added per ton of steel should be 0.4-2.0kg/t, and the final aluminum content of steel types with high carbon content less, steel with low carbon content needs more aluminum.

(6) The hollow square tube oxygen top-blown converter mainly uses molten iron as raw material. When molten iron is blown into steel, impurity elements such as C, Si, Mn, P, and S must be removed. At the same time, part of the iron is oxidized and discharged with the furnace gas, while the other part remains in the slag. Splashing during the blowing process also loses part of the metal.