A kind of high-quality hypoeutectoid tool steel wire rod and production method thereof

Abstract

The invention discloses a high-quality hypoeutectoid tool steel wire rod and a production method thereof. The chemical composition of the wire rod and its mass percentage are as follows: C: 0.63-0.68%, Si: 1.10-1.20%, Mn: 0.60‑0.70%, P≤0.025%, S≤0.025%, Cr: 0.30‑0.40%, Mo: 0.50‑0.60%, V: 0.20‑0.30%, Ni: 0.10‑0.20%, Cu≤0.25%, the rest are Iron and inevitable impurities; the production method includes molten steel smelting, continuous casting, billet transportation, slow cooling storage, furnace heating, high-pressure descaling, controlled rolling, and controlled cooling processes. By optimizing the composition and using the means of controlled rolling and controlled cooling, the invention obtains the tool steel wire with high strength and good plasticity, effectively avoids the occurrence of brittle fracture, facilitates subsequent drawing and machining, and can replace the tool steel sheet.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-quality hypoeutectoid alloy tool steel wire rod and a production method thereof. Background technique [0002] In recent years, in order to improve the performance of steel, there has been an increasing demand for high-quality special steel such as tool steel and cutting tool steel at home and abroad. Due to the high hardness of high-carbon alloy tool steel, the rolling production is difficult, and the process requirements are high. At first, my country's high-quality special steel mainly consisted of profiles and narrow strip steel with a width of less than 500mm, and there was no high-carbon hot-rolled coil that had been eutectoid. . Due to the high yield of large-width coils and the relatively stable quality of converter smelting products, major domestic steel mills have begun to research and develop medium- and high-carbon hot-rolled coils. High-alloy pl...

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Problems solved by technology

[0008] At present, most tool steels use eutectoid high alloys, and most of them are made of plates. Due to the blank shape, the plates need to be cut, and the cutting loss can reach 3-5%. In addition, surface cracks are prone to occur during the production process, resulting in low yield and high cost.

However, with the optimization of the manufacturing process, the use of wire rods to manufacture tool steel products has a higher utilization rate and lower cost. Therefore, some domestic special steel wire rod manufacturers try to produce different types of hypereutectoid high-alloy tool steels, but the quality of tool steel Unstable, high brittle fracture rate

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