The Effect of Oxygen on the Surface Quality of Titanium Containing Stainless Steel Plate
The most common waste of 08Crl8Ni10Ti stainless steel plate products is caused by surface defects such as scabs. This defect was found in the final process of inspecting the pickled steel plate. They are generated during the casting and solidification process of steel ingots in the steelmaking process, and are distributed under the skin of the steel ingots in the form of titanium oxides and nitrides (known as the non-uniformity of titanium). Microstructural analysis of the scar area indicates the presence of local aggregation of titanium oxide.
According to the properties of stainless steel, stainless steel containing Cr>8 and Ti>0.3 has a high equilibrium oxygen concentration. As the chromium content in steel increases, the solubility of oxygen in iron (the equilibrium concentration of oxygen) begins to decrease; When the chromium content reaches around 8%, the solubility of oxygen reaches its lowest value. However, further increasing the chromium content in the steel results in a significant increase in oxygen solubility, which is due to a decrease in oxygen activity as the chromium concentration increases. As is well known, when the titanium concentration in steel is 0.3, the solubility of oxygen is the smallest. The analysis of the total oxygen and aluminum content in steel shows that when the aluminum content of the finished steel is between 0.05 and 0.10, its yield is around 50%, while the average yield of titanium is 57. The oxygen content fluctuates in a large range of 0.006 to 0.024. As is well known, when smelting stainless steel, the oxidation level of slag depends on the oxide content of iron, manganese, and chromium. In smelting experiments with different aluminum consumption, slag selection experiments were also conducted. The relationship is determined based on the total content of Cr2O3, FeO, and MnO in the slag (as shown in Figure 1). Obviously, when the aluminum consumption is 0.8kg/t, as the oxidation degree of steel slag increases, the oxygen content in the finished steel increases significantly. When the aluminum consumption increases to 1.2kg/t, it will largely suppress the secondary oxidation process during tapping and reduce the impact of slag oxidation degree.
The consumption of silicon calcium alloy is at 4.5kg/t. The relationship between oxygen content and slag oxidation degree in steel with different aluminum consumption
1. 1.2kg/t aluminum block for 4 people; 2. 3 cast aluminum blocks 0.8kg/t
The addition method and quantity of aluminum blocks affect the local aggregation of titanium oxide in the subcutaneous area of the steel ingot, thereby affecting the shear and scrap rate of the finished steel. The first grade product rate of the steel plate reaches 82.5. The above research results indicate that. During the production of Cr Ni Ti stainless steel, the method of increasing the deoxygenation depth can be used to reduce the oxygen content of the molten steel.
According to the properties of stainless steel, stainless steel containing Cr>8 and Ti>0.3 has a high equilibrium oxygen concentration. As the chromium content in steel increases, the solubility of oxygen in iron (the equilibrium concentration of oxygen) begins to decrease; When the chromium content reaches around 8%, the solubility of oxygen reaches its lowest value. However, further increasing the chromium content in the steel results in a significant increase in oxygen solubility, which is due to a decrease in oxygen activity as the chromium concentration increases. As is well known, when the titanium concentration in steel is 0.3, the solubility of oxygen is the smallest. The analysis of the total oxygen and aluminum content in steel shows that when the aluminum content of the finished steel is between 0.05 and 0.10, its yield is around 50%, while the average yield of titanium is 57. The oxygen content fluctuates in a large range of 0.006 to 0.024. As is well known, when smelting stainless steel, the oxidation level of slag depends on the oxide content of iron, manganese, and chromium. In smelting experiments with different aluminum consumption, slag selection experiments were also conducted. The relationship is determined based on the total content of Cr2O3, FeO, and MnO in the slag (as shown in Figure 1). Obviously, when the aluminum consumption is 0.8kg/t, as the oxidation degree of steel slag increases, the oxygen content in the finished steel increases significantly. When the aluminum consumption increases to 1.2kg/t, it will largely suppress the secondary oxidation process during tapping and reduce the impact of slag oxidation degree.
The consumption of silicon calcium alloy is at 4.5kg/t. The relationship between oxygen content and slag oxidation degree in steel with different aluminum consumption
1. 1.2kg/t aluminum block for 4 people; 2. 3 cast aluminum blocks 0.8kg/t
The addition method and quantity of aluminum blocks affect the local aggregation of titanium oxide in the subcutaneous area of the steel ingot, thereby affecting the shear and scrap rate of the finished steel. The first grade product rate of the steel plate reaches 82.5. The above research results indicate that. During the production of Cr Ni Ti stainless steel, the method of increasing the deoxygenation depth can be used to reduce the oxygen content of the molten steel.
