Method for producing high cleanliness steel excellent in...

Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal

Reexamination Certificate

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C148S320000

Reexamination Certificate

active

07608130

ABSTRACT:
The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li—Si alloy having a Li content between 20 and 40% and/or Li2CO3as a Li-containing substance to a molten steel. The Li-containing substance is added to the molten steel after the completion of a series of steps of a ladle refining process including composition adjustment, temperature adjustment and slag refining. The high-cleanliness steel has a total-Li content between 0.020 and 20 ppm by mass and contains 1.0 or below oxide inclusion particle having a major diameter of 20 μm or above at a maximum in 50 g of the steel wire. The steel contains an oxide inclusion that has a CaO content between 15 and 55%, SiO2content between 20 and 70%, an Al2O3content of 35% or below, a MgO content of 20% or below and a Li2O content between 0.5 and 20%. The high-cleanliness steel has improved fatigue characteristics and improved cold workability.

REFERENCES:
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The Iron and Steel Institute of Japan, Recent Development of Production Technology for Super-clean Wire Rod, Nishiyama Memorial Technical Lecture, pp. 147-155, with English Translation 1988.
Peter Spiekermann, “Alloys—a special problem of patent law ? (T)”, AIPPI, vol. 40, No. 11, XP-002445420, 1995, pp. 738-753.
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