The invention relates to a seamless
steel tube for a rare-earth-containing L625Q submerged pipeline and a production method of the seamless
steel tube. The production method comprises the following steps: carrying out pretreatment on
blast furnace molten iron so that the S content of the
blast furnace molten iron is reduced to below 0.010% in percentage by
mass; adding the treated
blast furnace molten iron and steel
scrap to a top-bottom combined blowing converter for
smelting, adopting deoxidation
alloy in the steel tapping process for deoxidation alloying, carrying out final deoxidation by adopting an aluminum deoxidation technology, carrying out
slag blocking or deslagging in the steel tapping process, adding
lime blocks after adding the
alloy in the steel tapping process, then adding the smelted molten iron to an LF (
Ladle Furnace) for refining, blowing
argon during refining, and heating for warming in a manner of gradually increasing the warming speed; then carrying out
slag making, desulfurization, composition adjustment and warming operations; adopting the operation of white
slag making, and adding
ferrovanadium alloy and
ferrotitanium alloy; finally continuously blowing
argon gas softly at the bottom, adding
rare earth wires, and then carrying out VD (
Vacuum Distillation) vacuum treatment, round billet
continuous casting, tube blank heating, perforating,
continuous rolling,
sizing, cooling, saw
cutting, heat treatment, straightening, flaw detection and chamfering.