For the straight seam steel pipe, the use of two kinds of deoxidizer has little effect on the total oxygen content in steel after VD treatment, and the total oxygen content in each process after Si-Al-Ba deoxidation, Si-Ca deoxidation effect.
When using Si-Ca and Si-Al-Ba two kinds of deoxidizer, the number and size of inclusions in the smelting process are different, and the number of inclusions in each process after Si-Al-Ba deoxidation is less than Si-Ca deoxidation, and the smaller size.
When Si-Ca and Si-Al-Ba two kinds of deoxidizing agents are used in straight seam welded pipe, the secondary oxidation of liquid steel occurs during the casting process, but the secondary oxidation of Si-Al-Ba deoxidized steel is more serious.
The inclusions in forging materials are different from those in aluminum inclusions. When the Si-Al-Ba deoxidization is used, the inclusions in the forging materials are mainly block and chain-like alumina, while the Si-Ca deoxidation The content of aluminum inclusions in the deoxidized forging material of Si-Ca alloy is less than that of Si-Al-Ba alloy.
