800MPa seamless steel pipe for marine drilling platform pile leg containing rare earth and manufacturing method of 800MPa seamless steel pipe
An offshore drilling platform and seamless steel pipe technology, applied in the direction of manufacturing converters, etc., can solve the problems of high production cost, high production difficulty, complicated production process, etc., and achieve the effect of low production cost and low production difficulty
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[0078] Example 1-3
[0079] The raw materials by weight percentage are: 90% blast furnace hot metal and 10% heavy steel scrap.
[0080] The production process sequence is: hot metal pretreatment → top and bottom combined blowing converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting → cutting → tube billet heating → piercing → continuous rolling tube → sizing → cooling → sawing → Heat treatment → straightening → flaw detection.
[0081] The specific production process is as follows:
[0082] The 90-ton blast furnace molten iron is pretreated with "metal magnesium powder" for desulfurization and deoxidation, so that the S content in the molten iron is reduced to less than 0.010% by weight.
[0083] The 90 tons of pre-treated molten iron is mixed into a 100-ton top-bottom combined blowing converter, and then 10 tons of heavy steel scrap are added, and then smelted by a single slag process. The final slag basicity is controlled at 3.0 and silicon ...
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