400MPa-grade low-carbon tire bead wire-drawing steel BT400BK and preparation method thereof

Abstract

The invention relates to 400MPa-grade low-carbon tire bead wire drawing steel BT400BK and a preparation method thereof. The low-carbon tire bead wire drawing steel BT400BK comprises the following chemical components in percentage by mass: 0.09%-0.12% of C, 0.12%-0.20% of Si, 0.45%-0.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S, less than or equal to 0.08% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.08% of Cu, less than or equal to 0.010% of Alt, less than or equal to 0.030% of As, less than or equal to 0.010% of Sn, less than or equal to 0.15% of Cu + Cr + Ni, less than or equal to 0.0070% of N and the balance of Fe. The method comprises the steps of converter smelting, steel ladle alloying, static argon blowing, LF furnace refining, continuous casting, a heating process, a rolling process and the like. The finished steel product prepared through the method is good in tensile strength and cleaning performance, excellent in wire rod surface quality, and excellent in plasticity and ductility.

Description

technical field [0001] The invention relates to the technical field of bead wires, in particular to a 400MPa low-carbon bead wire drawing steel BT400BK and a preparation method thereof. Background technique [0002] Bead wire is mainly used in the tire industry. The high product quality and low-cost comprehensive advantages of my country's bead wire companies have gained relatively broad development opportunities in the global procurement model of the tire industry. At the same time, the speed of tire product replacement is accelerating. Enterprises have put forward higher requirements for the research and development of skeleton material technology. The application of high-performance bead wire can not only improve the safety performance of tires, but also meet the requirements of green environmental protection. [0003] The steel BT400BK for 400MPa bead wires is used in the middle wire of tires, which has very strict requirements on the cleanliness of molten steel (maximum ...

AI Technical Summary

Problems solved by technology

The proportion of brittle inclusions and Ti-inclusions in bead wire steel BT400BK prepared by the existing method increased, 16.67% of the brittle inclusions were over 40 μm in size, the largest titanium inclusion width was over 20 μm, and the tensile strength was biased. Low ≤ 400MPa, unable to meet the above requirements, there is still room for further improvement and improvement

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