Do everyone know what nitrided chromium iron does? In fact, nitrided chromium iron is often used as a deoxygenation and desulfurization agent. Now that we know what nitrided chromium iron does, who knows the impact of deoxygenation and desulfurization agents on non-metallic inclusions in high-pressure boiler tube steel?
about ω (Als) ≤ 0.01% high-pressure boiler tube steel, the use of two deoxidizers has little effect on the total oxygen content in the steel after VD treatment, and both can reduce the ω (T.O) controlled at 20 × Below 10-6; After Si-Al-Ba deoxygenation, lower total oxygen content can be obtained in all processes, and the deoxygenation effect of each process is stronger than that of Si-Ca deoxygenation.
When using two different deoxidizers, Si Ca and Si Al Ba, there are significant differences in the amount and scale of impurities added during the exercise process. The amount of impurities added in each process after Si Al Ba deoxidization is smaller than that after Si Ca deoxidization, and the scale is smaller.
When using two different deoxidizers, Si Ca and Si Al Ba, significant secondary oxidation occurs in the molten steel during the casting process, but the secondary oxidation of Si Al Ba deoxidized steel is more severe.
There is a significant difference in the composition of impurities and the content of aluminum impurities in the forged material. When using Si Al Ba deoxygenation, the impurities in the forged material are mainly block and chain shaped alumina. When using Si Ca deoxygenation, the impurities in the forged material are mainly strip shaped silicon manganese aluminate composite impurities; The content of aluminum impurities in Si Ca alloy deoxygenated forgings is lower than that in Si Al Ba alloy deoxygenated forgings.