Steel wire rod for annealing-free solder wire and production process thereof

Abstract

The invention belongs to the metallurgy field and relates to a production process of a steel wire rod, particularly the steel wire rod for an annealing-free solder wire and a production process of the steel wire rod, wherein the steel wire rod comprises elements in weight percentage as follows: 0.07-0.1% of C, 1.25-1.4% of Mn, 0.4-0.6% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.2-0.55% of Mo, 0.5-1.0% of Ni, less than or equal to 0.2% of Cu, less than or equal to 0.2% of Ti and less than or equal to 0.1% of Al with the balance of Fe. The process comprises steps of detecting a blank, heating the steel blank, descaling by high-pressure water, roughly and intermediately rolling, pre-finishing rolling, cooling in a first section by water, finishing rolling bya unit, cooling in a second section by water, diameter reducing and sizing rolling, cooling in a third section by water, spinning, cooling by wind, finishing and delivering to a warehouse. The methodof the invention employs a rolling-controlled and cooling-controlled process to execute process control of the steel wire rod of the solder wire to obtain an F+P tissue appropriate to draw, and has advantages as follows: good comprehensive mechanical property is realized, a solder wire factory can avoid annealing and perform multi-pass drawing without wire breakage, the production efficiency is greatly increased and the production cost is reduced at the same time.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a production process of a wire rod, in particular to an annealing-free welding wire steel wire rod and a production process thereof. Background technique [0002] In the prior art, when welding wire production enterprises use ER69-3 and other welding wire steel wire rods as raw materials to make welding wires, due to the poor plasticity index of welding wire steel wire rods, it is generally necessary to perform intermediate annealing on welding wire steel wire rods to produce welding wires. The production process is relatively complicated, and the processing cost is relatively high; the welding wire made by intermediate annealing using the existing welding wire steel wire rod is prone to wire breakage after multi-pass drawing, and the energy consumption is high, the production efficiency is low, and the area shrinkage rate is low. Product properties such as elongation and elongation cannot...

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Problems solved by technology

[0002] In the prior art, when welding wire production enterprises use ER69-3 and other welding wire steel wire rods as raw materials to make welding wires, due to the poor plasticity index of welding wire steel wire rods, it is generally necessary to perform intermediate annealing on welding wire steel wire rods to produce welding wires. The production process is relatively complicated, and the processing cost is high; the welding wire made by intermediate annealing using the existing welding wire steel wire rod is prone to wire breakage after multi-pass drawing, and the energy consumption is high, the production efficiency is low, and the area shrinkage rate is low. Product properties such as elongation and elongation cannot meet user requirements

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