A heat treatment method for re-sorbitizing steel wire or steel strip

A heat treatment method and sorbite technology, applied in the field of heat treatment, to achieve the effect of realizing sorbite structure size and realizing control

Active Publication Date: 2018-01-19
GUIZHOU GUDA CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So as to meet the relevant heat treatment alternative process requirements

Method used

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  • A heat treatment method for re-sorbitizing steel wire or steel strip
  • A heat treatment method for re-sorbitizing steel wire or steel strip
  • A heat treatment method for re-sorbitizing steel wire or steel strip

Examples

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Embodiment 1

[0014] Example 1: 3.2 mm 70 steel cold-drawn steel wire is re-sorbitized and heat-treated, and the wire is heated to an austenite temperature of 860 ° C in a tube furnace. After a period of heat preservation, 0.5 The compressed air at -0.3 MPa immediately cools the steel wire out of the furnace. The steel wire is cooled while it is out of the furnace. Before being cooled by the compressed air, the temperature of the steel wire remains at the austenitizing temperature. -1s or so to complete, the time is controlled by the cooling speed of the compressed gas to ensure that any part of the steel wire will not be cooled below 200°C. The steel wire is forced to cool for 0.5-1s without any treatment, or it is allowed to enter a casing continuously and stand for a period of time. The resulting structure has a high sorbite rate, small interlamellar spacing, and a small sorbite group size, such as figure 1 and figure 2 as shown, figure 1 For the steel wire microstructure (SEM) after...

Embodiment 2

[0015] Example 2: For a 65Mn strip with a thickness of 0.75mm and a width of 15mm, heat it to 890°C for austenitization isothermal, and after cooling to 800°C, immediately use a cooling rate of 200-250°C / s for spraying. Cooling, the spray cooling time per unit length is about 2 seconds, and immediately leave the spray cooling port to cool naturally to room temperature.

[0016] Such as image 3 and Figure 4 Shown: image 3 It is a sample SEM processed according to the method of the present invention, and its structure is mainly uniform and fine sorbite, and the sorbite rate is high. Figure 4 It is the SEM of the conventional salt bath isothermal quenching style, and the lamellar layer is obviously coarsened, and the massive proeutectoid ferrite is very obvious.

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Abstract

The invention discloses a heat treatment method for re-sorbitizing steel wires or steel strips. The heat treatment method comprises the following steps: heating the steel wires or steel strips to austenite temperature, quickly cooling the austenitized isothermal steel wires or steel strips to the temperature range more than the martenitic transformation point of a material or the temperature range of 200-450 DGE C, then sending the steel wires or steel strips into an insulation sleeve for standing and heat preservation, and thus completing sorbite phase transformation; controlling the temperature of the sleeve to any temperature point between the room temperature and 500 DEG C. The method for sorbitizing the steel wires or steel strips does not need isothermal equipment of lead bath and salt bath and does not need special isothermal devices. The cool temperature is controlled by changing the cooling speed, and therefore the size of sorbite structures is controlled.

Description

technical field [0001] The invention relates to the technical field of heat treatment for re-sorbitization of steel wires and strips. Background technique [0002] During the cold deformation processing of some carbon steel wires and thin plates and strips, due to the work hardening after the cold deformation reaches a certain level, it cannot be further deformed. , Uniform and fine pearlite (Sorbitite) structure, which meets the requirements of its use organization or meets the requirements of further processing. [0003] Traditionally, the re-solvitization of wire rods and thin plates and strips needs to be reheated to the austenitization temperature. After a period of heat preservation, they are placed in liquid lead or salt for a period of time in a lead bath or a salt bath. Isothermal at a specific temperature obtains the corresponding fine pearlite (sorbite) structure. However, its manufacturing process is relatively difficult to control. In order to obtain a smaller...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/52
Inventor 梁宇梁益龙魏泽民熊虎
Owner GUIZHOU GUDA CABLE CO LTD
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