Rapid induction heating and air cooling heat treatment process for steel wire

Abstract

The invention discloses a rapid induction heating and air cooling heat treatment process for a steel wire. The process comprises the following steps of: rapidly heating a high-carbon steel wire with the diameter of 2 to 4mm to austenitizing temperature in an induction heating mode within three seconds, keeping the temperature for 5 to 20 seconds, and rapidly cooling the heated steel wire to sorbite low temperature in an air cooling mode to obtain a fine sorbite structure, wherein the rapid air cooling rate is 80 to 200 DEG C / second. The process has the advantages that the process is environment-friendly and easy and convenient to operate, expensive heat treatment equipment is not needed, manufacturing cost is low, production efficiency is high, and the like; and by the process, obvious social benefit and economic benefit are achieved.

Description

technical field [0001] The invention relates to a rapid induction heating steel wire air cooling heat treatment process, which belongs to the technical field of steel wire rope metal wire heat treatment. Background technique [0002] Existing steel wire rope manufacturing process, at first needs to manufacture steel wire and then carry out twisting into strand, finally synthesize into rope. In the steel wire manufacturing process, the raw material wire rod of sorbite is drawn into a certain diameter steel wire after pre-treatment. Due to deformation work hardening, most steel wires cannot be drawn to the final size at one time, and intermediate heat treatment is required to obtain a fine sorbite structure to eliminate deformation work hardening, so that the steel wire regains the ability to deform. This heat treatment method is called Padden deal with. In the intermediate heat treatment process of the steel wire, it is necessary to carry out isothermal treatment in a lead ...

AI Technical Summary

Problems solved by technology

The main problems are that the cooling rate of the high-temperature section is not as fast as that of the lead bath, and the cooling rate of the low-temperature section is faster than that of the lead bath quenching, which is easy to obtain martensite and cause brittleness, resulting in unstable quality of carbon steel wire, difficult process operation, and main performance indicators lower than that of lead bath quenching. Therefore, it has not been promoted and applied

In the carbon wire rod, some enterprises have adopted the air cooling method to process the rolled wire rod (the diameter of the wire rod is 8 ~ 15mm), and more than 90% of the sorbite structure can be obtained, but because the cooling rate of this treatment method is relatively slow Low, can only obtain sorbite with coarse group size and interlayer spacing, so its strength and plasticity are low, which cannot meet the performance requirements of steel wire

Therefore, the existing heat treatment process for steel wire used for steel wire rope is still not ideal.