Production method and application of low-carbon steel containing boron and titanium, and high-speed wire rods thereof

Abstract

The invention discloses a production method and an application of low-carbon steel containing boron and titanium, and high-speed wire rods thereof. The low-carbon steel containing boron and titanium contains the main chemical ingredients in percentage by mass: not greater than 0.08% of carbon, not greater than 0.10% of silicon, not greater than 0.60% of manganese, not greater than 0.030% of phosphorus, not greater than 0.035% of sulphur, not less than 0.020% of aluminium, 0.0040-0.0080% of boron, not less than 0.060% of titanium, and the balance Fe and other inevitable impurities. The specific production method is that low-carbon steel billets containing boron and titanium are charged into a furnace and subjected to heating operation, a finish rolling temperature is 940+ / -10 DEG C, a spinning temperature is 910+ / -10 DEG C, and a slow cooling process is adopted for a cooling process for the wire rods. The tensile strengths of the high-speed wire rods made from the low-carbon steel containing boron and titanium are reduced to 360-380MPa, and the mechanical property of the low-carbon steel is close to the level of about 350MPa of the mechanical property of common low-carbon steel, thus the problem of low cold upsetting and wire-drawing use performance of the low-carbon steel after boron element and titanium element are added is solved, and the deep processing requirements of the wire rods are met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and high-speed wire rolling, and in particular relates to a production method and application of boron-containing titanium low-carbon steel and high-speed wire. Background technique [0002] Low-carbon steel high-speed wire rod is the main variety of wire rod in my country. Its output accounts for more than 80% of the total wire rod output. It is usually used for cold heading and wire drawing. It is required that the deformation resistance of low-carbon steel wire rod should not be too high. Adding trace alloys to low-carbon steel has become a trend to improve the competitiveness of high-speed wire rod products, and the attention of boron and titanium elements in trace alloys is high. With the change of the content of boron and titanium in the steel, the grain structure, phase composition and precipitate form of the steel are all affected, and these effects have a great relationshi...

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Problems solved by technology

[0003] The technical problem to be solved in the present invention is to provide a production method and application of boron-containing titanium low-carbon steel and its high-speed wire rod, a production method of boron-containing titanium low-carbon steel and its high-speed wire rod when the carbon content is not more than 0.08 % low-carbon steel, add 0.0040-0.0080% boron and not less than 0.060% titanium, adjust the process parameters to control rolling and cooling, change the microstructure transformation during the cooling process of the wire rod, and obtain uniform and fine grains Grain structure reduces the mechanical properties of this boron-containing titanium low-carbon steel high-speed wire to that of ordinary low-carbon steel, and solves the problem of poor cold heading and wire drawing performance of low-carbon steel after adding boron and titanium elements. Boron-containing titanium low-carbon steel high-speed wire rods with specifications ranging from 5.5mm-16.0mm can meet the requirements for deep processing of wire rods

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