Middle-thick-specification steel wire sorbitic cooling device and process

Abstract

The invention discloses a middle-thick- specification steel wire sorbitic cooling device and process. The cooling device defines a cooling water circulating system through a water storage tank with awater pump therein, a recycling water slot with two cooling water sleeves therein, and a cooling water tank, which are connected through pipelines. The process mainly adopts a spraying and two-grade sectional cooling process to replace a conventional lead-bath quenching process, so that a steel wire can be effectively prevented from cracking defects, middle-thick- specification steel wire sorbiticintermediate thermal treatment quality is guaranteed, and steel wire performance and stability are improved. The cooling process has the advantages of being free of pollution, low in energy consumption and simple in process. Besides, the temperature measured by an infrared temperature measurer is used to regulate water inlet amount and a distance between the two cooling water sleeves, and water medium can be utilized to realize different process requirements of steel wires of different specifications and materials, so that trouble of frequently replacing a quenching medium is avoided, operations are simplified, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal products, and more specifically relates to a sorbite cooling device and process for medium and thick steel wires. Background technique [0002] In the production process of high-carbon steel wire, it is necessary to carry out intermediate heat treatment of Sorbitization on the steel wire. So far, the traditional and commonly used method is lead bath quenching. The steps are as follows: After the steel wire is unrolled, it is heated to about 910°C at a high temperature and then quickly enters a lead bath at about 500°C to complete the rapid cooling and isothermal transformation of the steel wire. This traditional lead bath quenching process has the advantages of stable process, easy control and easy guarantee of mechanical properties of steel wire, so it is widely used in steel wire production. However, the lead bath quenching process also has serious deficiencies: 1. Lead is a poi...

AI Technical Summary

Problems solved by technology

However, the lead bath quenching process also has serious deficiencies: 1. Lead is a poisonous substance. If it is exposed to for a long time, it will cause great harm to the human body; 2. The melting point of lead is 327.5°C. It consumes a lot of energy, and on the other hand, it is also prone to volatilization and causes environmental pollution. The newly issued national policies have clearly stipulated that the heat treatment lead furnace is an obsolete equipment; The production of "not only consumes lead resources, but also affects the surface and other properties of the steel wire in the subsequent lead-drawing bath quenching process

[0003] Although the heat treatment industry at home and abroad has been looking for a sorbite treatment method that can replace lead, that is, the steel wire is directly wetted into water or other quenching media, and the cooling capacity is controlled by controlling the time, but due to the instability of the local solution temperature property, it is easy to cause the instability of steel wire performance

At present, this alternative treatment method is generally used on thin-gauge steel wires, and it often causes problems such as surface quenching cracks when applied to medium-thick-gauge steel wires.

Images