For ω (Als≤0.01%) LSAW steel pipes, the use of two deoxidizers has small effect on tWhat is the Effect of Deoxidizer for LSAW Steel Pipe?he total oxygen content in the steel after VD treatment, and both can control ω (T.O controled below 20×10-6); Si-Al- After Ba deoxidation, lower total oxygen content can be obtained in each process, and the deoxidation effect of each process is stronger than that of Si-Ca.

When using two different deoxidizers, Si-Ca and Si-Al-Ba for LSAW steel pipes, the number and size of inclusions in the smelting process are quite different. After Si-Al-Ba deoxidation, the number of inclusions in each process is less than after Si-Ca is deoxidized, the size is smaller.

When two different deoxidizers, Si-Ca and Si-Al-Ba, are used for straight seam steel pipes, the molten steel undergoes obvious secondary oxidation during the casting process, but the secondary oxidation of Si-Al-Ba deoxidized molten steel is more serious.

There is a big difference between the composition of inclusions in forgings and the content of aluminum inclusions. When Si-Al-Ba is used for deoxidation, the inclusions in forgings are mainly block and chain alumina. When straight seam steel pipes are used for Si-Ca deoxidation, forging The inclusions in the material are mainly strip-shaped silico-manganese aluminate composite inclusions; the content of aluminum inclusions in the Si-Ca alloy deoxidizing forging material is less than that of the Si-Al-Ba alloy.