High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire

Abstract

The invention relates to a high-carbon steel wire with good fine steel cord drawing machining performance. Chemical components of the steel wire include, by mass percentage, 0.60-1.00% of C, 0.10-0.60% of Si, 0.10-0.20% of Mn, 0.20-0.50% of Cr, smaller than or equal to 0.01% of S, smaller than or equal to 0.013% of P, smaller than or equal to 0.05% of Cu, smaller than or equal to 0.0010% of Ca, smaller than or equal to 0.005% of V, 0.0010-0.0040% of N, smaller than 0.0010% of solid dissolved N, smaller than or equal to 0.0030% of Al, smaller than or equal to 0.02% of Mo, smaller than or equal to 0.02% of Ni, smaller than or equal to 0.0005% of B and the balance Fe. Due to the fact that the key elements in the steel wire are optimized, the steel wire which has the good mechanical performance, a specific pearlite microstructure and more simple components is obtained, and the requirement for the good steel cord drawing machining performance is met.

Description

technical field [0001] The invention belongs to the high-carbon steel wire that can be used as tire radial cord after being drawn to a fine steel wire, especially the high-carbon steel wire with improved drawing processing performance and optimized drawing process and a manufacturing method thereof. Background technique [0002] With the rapid development of the world economy, especially the rapid development of China's economy. Highway, automobile, transportation and other industries are still developing rapidly, and the proportion of all-steel radial truck tires and light-duty radial tires for automobiles continues to increase, and the market prospect is very good. The lightweighting of automobiles requires steel wires to have higher strength. For example, in the process of wire drawing and further production of fine steel cord, due to the large amount of drawing deformation and high strength of steel wire, it is easy to break, resulting in a decrease in productivity and ...

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Problems solved by technology

[0003] Application No. 201180050074.0 discloses a high-carbon steel wire with excellent wire drawing process. In order to improve the wire drawing performance, by adding sufficient Ti content, N becomes TiN, so as to reduce the solid solution N of the steel type as much as possible, and ensure the specified amount of solid solution B , to improve wire drawing performance; however, Ti compounds such as TiN, which are formed by solid solution N and Ti, exist in steel as brittle inclusions, which have high hardness and polygonal shape, and are prone to broken wires during the drawing and twisting process of steel wires , which significantly affects wire quality and production efficiency

[0004] Application No. 201180012852.7 discloses a high-carbon steel wire rod with excellent wire drawing processability and fatigue after wire drawing. In order to improve the drawability of the wire rod and the fatigue characteristics after wire drawing, sufficient B content is added to make B solid solution N as a BN compound. Precipitation, but the B added for the solid solution of N forms too much BC and Fe compound will gather and precipitate along the pearlite grain boundary in the center of the wire rod, forming a coarse BC center network compound, resulting in the drawing of the wire rod in the subsequent channel Embrittlement during the process, which deteriorates the wire drawing processability

[0005] Application No. 200980100006.3 discloses wire rods with excellent ductility, high-strength steel wires and their manufacturing methods. By adding one or both of Mo and W, the growth of pearlite in the high temperature range above 600 ° C is suppressed, and the thick flaky pearlite is further suppressed. At the same time, it improves the hardenability, inhibits the formation of ferrite, and increases the proportion of sorbite, but excessive addition of these elements inhibits the growth of pearlite in the entire temperature range, which makes the cooling time longer, reduces productivity, and precipitates in the center of the wire rod Compounds of Mo2C and W2C will also reduce the wire drawing processability of the material

[0006] Application No. 200980100006.3 discloses wire rods with excellent ductility, high-strength steel wires and their manufacturing methods. By adding one or both of Mo and W, the growth of pearlite in the high temperature range above 600 ° C is suppressed, and the thick flaky pearlite is further suppressed. At the same time, it improves the hardenability, inhibits the formation of ferrite, and increases the proportion of sorbite, but excessive addition of these elements inhibits the growth of pearlite in the entire temperature range, which makes the cooling time longer, reduces productivity, and precipitates in the center of the wire rod Compounds of Mo2C and W2C will also reduce the wire drawing processability of the material

[0007] To sum up, in order to meet the good drawing performance of the existing steel cord steel, more complex steel element composition is used, which not only increases the cost of raw materials, but also the added trace elements often have other adverse effects, which affects the manufacturing process of the wire rod. also increased difficulty

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