Technique for producing wire rod for low carbon drawn wire

Abstract

The invention relates to a technique of a wire rod for producing a low-carbon wire drawing. A production technique of converter - Ar-blowing refining - continuous casting - highline mill is adopted currently, which has the advantages of low production cost and little carburization and silicon-adding to the molten steel, but has the disadvantages of poor refining effect, high oxygen content, being difficult to deeply desulfurize and to remove inclusions, which influence the drawability of the wire rods, therefore, the technique of converter - ladle furnace (LF) refining - continuous casting - highline mill is invented, wherein, the LF ladle refining adopts reduction operation, aluminum wires are fed to enhance the molten steel to oxidize, then deoxidizers such as calcium carbide, aluminum granules, etc. are added to carry out diffusive deoxidation, and the whole course stirring on the condition of bottom argon-blowing is done simultaneously; when in refining, a white-slag refining system is adopted; before finishing the refining, calcium iron wires are fed in the LF, and then stirring on the condition of soft argon-blowing is done. The technique of the invention substitutes the original Ar-blowing refining with the ladle furnace (LF) refining so as to realize deoxidation and desulfurization of the molten steel and removal of the non-metal inclusions by absorption, therefore, the (O) in the steel is less than 20 PPm and the (S) is less than 0.010 percent, and the amount of carburization and silicon-adding to the molten steel can be respectively controlled within 0.02 percent; that continuous casting heats of the molten steel are more than 10 heats is realized in the invention, thus improving the quality and castability of the steel.

Description

technical field [0001] The invention relates to a low-carbon steel smelting, continuous casting and rolling process, in particular to a low-carbon low-silicon steel smelting, continuous casting and rolling process. technical background [0002] At present, converters produce low-carbon wire rods for wire drawing, including low-carbon steel wires for galvanizing and steel wires for welding, all of which are produced by converter → argon blowing refining → continuous casting → high-speed rolling mill. First, after the steel is smelted in the converter, the final deoxidation process using one or more deoxidizers such as aluminum manganese ferromanganese, silicon aluminum barium iron, silicon aluminum barium calcium iron, calcium carbide, etc. Argon blowing and stirring are carried out in the ladle, oxygen is fixed in the ladle, and aluminum wire is fed for deoxidation; then billets are poured into billets through continuous casting of billets, and finally wire rods for wire dra...

AI Technical Summary

Problems solved by technology

The traditional process has the advantages of lower production cost and less carbon and silicon increase in molten steel, but due to the limitation of refining means and time, the refining effect of molten steel is not good, the inclusions in steel cannot be fully removed, and it is difficult to achieve deep desulfurization of molten steel. The high oxygen content in the steel affects the drawability of the wire rod

At the same time, the control accuracy of molten steel composition is low, which also causes fluctuations in wire rod performance

[0003] In order to overcome the above-mentioned limitations of refining means and time, the inclusions in steel cannot be fully removed, it is difficult to realize deep desulfurization of molten steel, the oxygen content in steel is high, and the shortcomings of molten steel composition control are low. The new process not only adopts the process route of "converter → LF ladle refining → continuous casting → high-speed rolling mill" to produce low-carbon special wire rod for wire drawing

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