Copper (Cu) - chromium (Cr) - zirconium (Zr) - mischmetal alloy and processing heat treatment

摘要

The present invention relates to the production of copper (Cu) - chromium (Cr) - zirconium (Zr) - mischmetal alloy which is an electrode material for resistance welding and spot welding of electrical contact materials and steel sheets, The present invention relates to a heat treatment, which comprises copper (Cu) as a main component, chromium (Cr) in an amount of 0.20 to 1.45% (weight percentage) and zirconium (Zr) in an amount of 0.25 to 2.00% , Which is a component capable of forming precipitates such as cerium copper CU _x Ce, lanthanum copper Cu _x La, niobium copper Cu _x Nd, and prandodinium copper Cu _x Pr during processing heat treatment, (Percent by weight) of mischmetal, which is a compound of Ce, Ce, La, Nd, Pr and the like in the range of 0.02 to 0.50% The present invention relates to a processing heat treatment capable of maintaining the hardness and the conductivity at HRC of 60 to 90 and IACS of 70 to 95%, respectively.;The material thus produced has excellent hardness and conductivity at high temperatures and exhibits excellent performance when it is used for resistance welding of electrical contacts and steel plates and electrodes for spots. The manufacturing method is as follows.;That is, an ingot after dissolving the above-mentioned copper (Cu) alloy is manufactured and forged, rolled, extruded or the like is performed at 800 to 950 占 폚 with a machining ratio of 7S (about 85% Cooling treatment such as rolling, forging, and drawing at a processing ratio of 70% or more at room temperature is carried out, and the above cold treatment is carried out at a temperature of 800 to 1,050 ° C for 30 minutes or more per 1 inch, Is maintained at a temperature of 350 to 550 캜 for 1 hour or more, and subjected to age-hardening heat treatment by water cooling, oil cooling, air cooling, etc., and the material after the above-mentioned process is used in this state or a component such as an electrode is produced. Depending on the target characteristics of the material or the product, the order of the cold working and the age hardening heat treatment may be changed, and in some cases, the cold working step may be omitted.