High-strength high-carbon steel wire rod and production method thereof

Abstract

The invention provides a high-strength high-carbon steel wire rod and a production method thereof. The high-strength high-carbon steel wire rod comprises the following components by weight percentage: 0.85%-0.90% of C, 0.1%-1.0% of Si, 0.3%-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.0010% of Ti and the rest Fe. The production method comprises the following steps of: 1), smelting: preprocessing molten iron, controlling sulfur to be less than 0.005%, and feeding less than or equal to 0.040% of Ti into a convertor, wherein the smelting final-point phosphorus content of the convertor is less than or equal to 0.010%, the final-point molten steel temperature of the convertor is at 1,570-1,680 DEG C, the refining process temperature is at 1,530-1,625 DEG C, and the refining time is for 20-50minutes; 2), continuous casting: adopting a large square ingot for the continuous casting, wherein the tundish molten steel superheating temperature is not more than 30 DEG C; and 3), continuous rolling and wire rod rolling, wherein the diameter of the wire rod is 5.5-8.0mm, the laying temperature is 870-910 DEG C, the sorbite transformation process temperature of the wire rod is controlled at 640-600 DEG C, the transformation time is controlled at 7-12seconds, and the sorbite transformation process average supercooling temperature of the wire rod is controlled at 60-80 DEG C. Due to the adoption of the high-strength high-carbon steel wire rod disclosed by the invention, the tensile strength can reach 1,200 MPa-1,300MPa, and the area reduction index is not less than 30%.

Description

technical field [0001] The invention belongs to the technical field of wire rods, in particular to a high-strength, high-carbon steel wire rod and a production method thereof. Background technique [0002] With the development of the automobile tire industry, the demand for wire rods for high-strength steel cords is increasing. The invention patent entitled "High Carbon Steel Wire Rod and Its Preparation Method (Application No.: 200910169807.7)" provides a high carbon steel wire rod with a tensile strength above 1200MPa and an area shrinkage rate above 35% and its preparation process , the wire rod contains basic components such as C, Si, Mn, Cr and V, and optional components such as Ni, Cu, Al, B, Ti, Nb and Mo, and also contains the balance of Fe and impurities. Its preparation process Including the sequential smelting, casting, rolling and controlled cooling processes. The high-carbon steel wire rod has excellent mechanical properties and less alloying elements. Howeve...

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However, from the perspective of cost control, the patented technology contains alloying ele...

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