Iron boron is an additive used in steelmaking that can significantly improve the physical and chemical properties of steel, improving its mechanical properties, wear resistance, non-variable properties and corrosion resistance. Iron boron can also promote the purification of inclusions in molten steel, reduce the adhesion of slag, and improve the efficiency and quality of steelmaking. In addition, iron boron can also reduce the difficulty of hot processing of steel, so that the shape of steel is easier to plastic deformation.
The advantages of iron boron
Compared with other steelmaking additives, iron boron has the advantages of small amount of addition, significant effect and low price. As a trace additive, the dosage of iron boron is usually between 0.0005% and 0.0035%, and the effect of iron boron can be maintained for a long time. Due to the small amount of its addition, the influence of iron boron on the composition and chemical properties of steel is relatively small, and the improvement of the comprehensive properties of steel is local rather than overall. This feature can meet the processing needs of specific steel materials, making it more widely applicable and widely used in various fields of the steel industry.
What are the effects of boron iron powder
Mainly used in steel and cast iron. Used in alloy structural steel, spring steel, low alloy high strength steel, heat resistant steel, stainless steel, etc. Boron can improve toughness and wear resistance in cast iron, and is widely used in the manufacture of automobiles, tractors, machine tools, etc.
There are three production methods of iron boron
thermit, electric thermit and electric carbothermic reduction.
- Thermit method. Boric acid was heated to 800℃ and dehydrated to obtain boron anhydride with boron trioxide content >95% as boron raw material, and the mixture of aluminum and magnesium aluminum alloy as reducing agent was ignited in the melting furnace to produce low carbon iron boron. In order to ensure the automatic reaction, it is necessary to add a heating agent. Unit charge reaction heat control in 2929~3347 kJ/kg, melting using the upper ignition method, the reaction process is rapid and intense.
- Electric thermit method. Cheap boron ore can be used, and aluminum magnesium alloy and heating agent can not be added to the reducing agent. Low aluminum-boron iron can be obtained by refining and dealuminization in an electric furnace. The electric furnace power used in the electric thermit process for smelting iron boronis usually 500~1000 kV · An, and the working voltage is 60~80 volts. The furnace body is made of magnesia lining and equipped with a slag discharge port. The furnace body is placed on a flat car that can be pulled out from under the electrode. In order to facilitate iron extraction, the bottom of the furnace is coated with magnesia powder. The charge is composed of an ignition agent (boron anhydride, iron scale and aluminum particles), a main material (boron anhydride, aluminum particles, iron scale or iron ore) and a settler (iron scale or iron ore, aluminum material and lime). When smelting, the ignition agent is first added to the furnace, after it is melted, the power is applied, and the main material is evenly added to the furnace with the screw feeder, and the heating is melted. After the charge is all melted, the power is cut off, it is left to stand for about 10 minutes, and the settler is added to make the metal beads in the slag fully settle, after about 5 minutes, most of the slag is discharged, and the alloy is removed after cooling in the furnace. If smelting iron boron with low boron content, boron ore can be used instead of boron anhydride.
- Electrocarbon-thermal reduction method. Iron boronis produced by carbon reduction in a small magnesian or carbonaceous lined electric arc furnace or ore furnace. The raw materials used are boron anhydride, boron concentrate, steel chips, charcoal and so on. Usually the intermittent production method is used, the mixed furnace charge is slowly added to the furnace, when the charge is melted and the flow is good, the iron outlet is opened, so that the slag iron flows into the ingot mold lined with the furnace at the same time, and the slag iron is separated after cooling.
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