High-carbon and low-alloy steel wire rod for producing fine steel wires, and its manufacturing method

Abstract

The invention discloses a high-carbon and low-alloy steel wire rod for producing fine steel wires, and its manufacturing method. The steel wire rod comprises 0.87-1.1wt% of C, 0.1-1.0wt% of Si, 0.3-1.2wt% of Mn, 0.1-1.0wt% of Cr, 0.015wt% or less of P, 0.010wt% or less of S, 0.0010wt% or less of Ti, 0.0050wt% or less of N, 0.0005-0.0020wt% of total aluminum, 0.0010-0.0030wt% of total oxygen, and the balance Fe and inevitable impurities. The manufacturing method is characterized in that de-oxidation alloying is carried out after converting, and the contents of Al and Ti residual in Si-Fe and Mn-Fe used in the above process are not greater than 0.03%, and the addition amounts of the Si-Fe and the Mn-Fe are 1.5-2.5kg / t and 3.5-4.5kg / t respectively; de-oxidation alloying is carried out in the refining process, the contents of Al and Ti residual in Si-Fe and Mn-Fe used in the refining process are not greater than 0.03%, and the addition amounts of the Si-Fe and the Mn-Fe are 0.5-1.0kg / t and 0.4-0.9kg / t respectively in the refining process; and the content of Al in molten steel in the refining process is 0.0002-0.0015%, and the total oxygen content in the molten steel is 0.0020-0.0040%. The tensile strength of the steel wire rod in the invention is 80-150Mpa higher than that of common 80-grade steel wire rods, the area reduction index is not less than 35%, there is no netted cementite structure, and the length-width ratio of 90% or more of oxide inclusions in the rolling direction is greater than 3, so drawing demands of users are satisfied.

Description

technical field [0001] The invention belongs to the field of low-alloy high-carbon steel, and in particular relates to a high-carbon low-alloy steel wire rod for producing thin steel wires and a manufacturing method thereof. Background technique [0002] It is well known that for high carbon steel wire rod, the tensile strength of the wire rod can be increased by increasing the carbon content. The invention patent entitled "High-strength steel wire rod and high-strength steel wire with excellent fatigue properties (application number) CN94192615.X" provides a high-strength steel wire rod and high-strength steel wire with excellent fatigue properties. Used in steel cords, steel belts and high-strength steel wires; the steel wires are used in steel wire ropes and PC (prestressed concrete) steel wires. The invention patent contains (by mass %) 0.7%-1.1% of C, 0.1%-1.5% of Si, 0.1%-1.5% of Mn, not more than 0.02% of P, not more than 0.02% of S, and others are Fe and unavoidabl...

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Problems solved by technology

The composition of the patented alloy is complex, which is not conducive to cost reduction

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