Warm drawing process for high-tensile-strength steel wire

Abstract

The invention discloses a warm drawing process for high-tensile-strength steel wire. The warm drawing process for the high-tensile-strength steel wire comprises the following steps that S1, steel quicklime and steel intermediate alloy formed by chromium, zirconium, silver, lanthanum, yttrium and magnesium are added into a furnace, the furnace is covered with calcined charcoal, inert gas is introduced, smelting is carried out sequentially at the power of 400 KW, 600 KW and 800 KW, the smelting time of each power is smaller than or equal to 10 min, 50% of foundry returns, preheated ferrochrome and a nickel plate are added into the furnace after melting, a smelting additive is added in a molten state, and smelting is carried out at the power of 1,400 KW; and S2, after furnace burden is completely molten, preheated scrap steel and 50-60% of electrolytic manganese are added for melting, and after the furnace burden is completely molten, 1.5 Kg / t of steel quicklime and 1-2 Kg / t of steel slagremover are added for primary slag pulling treatment. According to the warm drawing process for the high-tensile-strength steel wire, the efficiency is improved, the internal structure of the steel wire is improved, the carbide cracking is reduced, the decarburization of the product is reduced, the excellent internal structure and surface quality of the final product are ensured, and at the sametime, the plasticity of the steel wire is improved on the basis of maintaining the high strength of the steel wire.

Description

technical field [0001] The invention relates to the technical field of steel wire warm drawing, in particular to a warm drawing process for high tensile strength steel wire. Background technique [0002] High-speed tool steel wire is used as a material for the production of tools such as taps, drills, and end mills, and occupies an important position in the tool industry. my country is a major producer of tungsten, molybdenum and vanadium, the main alloying elements in high-speed tool steel, and has unique resource conditions in high-speed steel production. High-speed steel wire accounts for 25% of the total high-speed steel, and the annual output is about 40,000-50,000 tons. Lithium-speed steel belongs to ledeburite steel, which is a high-alloy steel that is difficult to deform. For small-sized finished steel wire, it must be drawn through multiple passes, and annealing and subsequent processes must be repeated after each intermediate drawing. [0003] At present, most o...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the domestic high-tech steel wire production plants adopt the traditional cold-drawing production process, and the area reduction rate of each pass does not exceed 20%. The main reason is that the initial carbides in the raw materials are relatively large in size. It can only be broken but not deformed during processing. Repeated cold drawing and annealing will undoubtedly reduce the processing efficiency and increase the cost. Repeated annealing will also increase the decarburization and oxidation of the steel wire surface, which will affect the processing of subsequent tools.