Production method of invar steel wire with high surface quality

Abstract

The invention discloses a production method of a high-surface-quality invar steel wire. The production method comprises the working procedures of vacuum melting, electroslag remelting, forging blank forming, rolling, cold drawing and aging heat treatment. The rolling procedure comprises the steps of high-temperature blooming, high-temperature temperature compensation and spinning water cooling; in the high-temperature temperature compensation step, the temperature is compensated to 1100-1200 DEG C, and the temperature compensation time is 0.5-2 hours; a cold-drawing process: performing peeling and double-abrasive-belt polishing treatment before drawing to the last but one pass or when drawing to D > d + 0.8 mm, and then continuing drawing; wherein D is the diameter of mm of the wire in the drawing process, and d is the diameter of mm of the finished wire; and in the aging heat treatment process, a protective atmosphere is adopted for annealing treatment. The method is suitable for producing invar steel wires with the diameter of 3.0-6.5 mm, the produced wires are bright in surface, free of oxide skin, scratches and drawing powder residues and good in mechanical property, the tensile strength of the wires is larger than or equal to 1100 MPa, and the percentage elongation after fracture at the gauge length of 250 mm is larger than or equal to 5%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of invar wire with high surface quality. Background technique [0002] Invar alloy, also known as Invar, has been widely used in the core material of double-capacity conductors (aluminum-clad Invar core super heat-resistant aluminum alloy stranded wire) in recent years because of its extremely low linear expansion coefficient. At present, the processing of Invar wire for power transmission wires is a cold drawing process. In order to reduce the drawing force and improve the surface quality of the wire, film agents and drawing lubricant powder are used during the drawing process. After drawing, the wire surface remains The coating agent, drawing powder, etc. will affect the next step of the aluminum cladding process, and need to be removed by pickling, peeling or grinding, which will prolong the production cycle and increase the production cost. ...

AI Technical Summary

Problems solved by technology

[0005] In the patent application "an alloy material for overhead wires and its production method" (application number 201911275204.5), "aluminum-clad nickel-molybdenum alloy steel wire for overhead wires and its production method" (application number 201910552315.X), "a Alloy Steel for Overhead Conductor, Production Method of Alloy Steel and Overhead Conductor” (Application No. 201810343144.5) and “Alloy Steel Core Wire for Overhead Conductor and Its Production Method” (Application No. 201911190132.4), vacuum smelting, electroslag Refining, forging, rolling, solution treatment, cold drawing, heat treatment, and secondary cold drawing. Under this process, the metallurgical quality of Invar has improved, but surface control such as peeling treatment has not been adopted during the cold drawing process. At the same time, the last process is cold drawing, and the film agent and drawing powder will still remain on the surface. Pickling or grinding is required for the next step of aluminum cladding.

Images