A kind of ultra-low carbon wire rod for blasting lead wire and its production method

Abstract

The invention provides an ultralow carbon coil rod for a blasting fuse and a production method thereof and belongs to the technical field of steel smelting and high-speed wire rolling. The ultralow carbon coil rod comprises the following chemical components in a percent by mass: smaller than or equal to 0.012% of C, smaller than or equal to 0.012% of Si, 0.15-0.30% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S and the balance of iron and unavoidable impurities. The production method comprises the following specific production procedures: manufacturing a casting blank of optimized components, heating a steel blank, rolling a wire material, cooling the wire material and slowly cooling. The production method ensures that the tensile strength of the coil rod is smaller than or equal to 310MPa, the elongation rate is larger than or equal to 45%, and electric conductivity is stably controlled between 14.5% and 15.0%. After drawing and thermal treatment, a blasting fuse finished product has a resilience angle which is smaller than 58 degrees and resistance being between 0.50 omega / m and 0.60 omega / m under the condition that the diameter is between 0.52mm and 0.54mm, and the processing requirements and the technical index requirements of the blasting fuse 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 an ultra-low-carbon wire rod for blasting lead wire and a production method thereof. Background technique [0002] Due to the particularity of the industry where the downstream processed finished product is located, the hot-rolled wire rod for blasting lead wire requires the wire rod itself to have a precise range of electrical conductivity values ​​and good comprehensive mechanical properties and drawability, so that the finished product after processing has a diameter of 0.52 Under the condition of -0.54mm, the rebound angle is less than 58°, and the resistance meets the requirement of 0.50-0.60Ω / m. [0003] Most of the blasting lines currently on the market use low-carbon steel wire rods, and low-carbon steel wire rods have the following disadvantages and deficiencies in the production of blasting lines: 1. Low-carbon ste...

AI Technical Summary

Problems solved by technology

[0003] Most of the blasting lines currently on the market use low-carbon steel wire rods, and low-carbon steel wire rods have the following disadvantages and deficiencies in the production of blasting lines: 1. Low-carbon steel wire rods have high deformation resistance, and the blasting wires after drawing The softness of the finished wire is poor, and it is difficult to meet the requirement of springback angle <58°; 2. The downstream processing technology has a large limit on the original size of low-carbon steel wire rod, and only low-carbon steel wire rod with a diameter of 5.5mm can be used; 3. Strict requirements on the level of inclusions