Method for shortening natural aging of 82B wire rod

A technology of natural aging and wire rod, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problem of low solubility, achieve good mechanical properties, improve drawing quality, and shorten the natural aging period

Inactive Publication Date: 2016-10-12
GUIZHOU WIRE ROPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aging phenomenon of high carbon steel wire rod is mainly caused by the escape of hydrogen, which has a high solubility in austenite but a low solubility in pearlite

Method used

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Embodiment Construction

[0018] Below in conjunction with embodiment the present invention is described in further detail:

[0019] Take the production of steel wire rod with a diameter of Ф12.5mm and steel grade 82B as an example:

[0020] The method for shortening the natural aging period of 82B wire rod of the present invention comprises following implementation steps:

[0021] (1) Put the 82B wire rod into the hydrochloric acid tank with step concentration for pickling, the wire rod goes through 5 hydrochloric acid tanks for hydrochloric acid pickling, and removes the iron scale, and then puts the wire rod into the high-pressure water washing tank in turn , clean water tank, surface adjustment tank for treatment;

[0022] When the ambient temperature is 20°C, tank 1: the HCL concentration is 80-140g / L, the ferrous ion concentration is ≤250g / L, and the temperature is 25-30°C;

[0023] 2# tank: HCL concentration is 120-180g / L, ferrous ion concentration is ≤200g / L, temperature is 30-35℃;

[0024] ...

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Abstract

The invention discloses a method for shortening the natural aging of a 82B wire rod. The method comprises the following steps: pickling a wire rod with gradient-concentration hydrochloric acid, wherein the pickling temperature reaches 30-50 DEG C, and the pickling time is 500-650 seconds; flushing with high-pressure water, and performing surface conditioning treatment; performing medium-temperature phosphorization in a phosphorization tank at 60-75 DEG C, wherein the phosphorization time is 200-260 seconds; putting the product in a high-temperature hot water tank at a temperature of over 85 DEG C, and staying for 70 seconds; and standing for 1-2 days for natural aging. The escape of hydrogen and the disappearance of residual stress can be accelerated, which is equivalent to artificial aging of the wire rod. In the invention, the aging period of the wire rod is greatly shortened, the mechanical properties of the wire rod are good, the problem in production turnover is solved, and the steel wire drawing quality is improved.

Description

technical field [0001] The invention relates to the natural aging problem of the 82B wire rod, shortens the natural aging period of the wire rod, solves the production turnover problem, reduces capital occupation, and improves drawing quality. Background technique [0002] It usually takes 2-5 days for the wire rod with a diameter of Ф12.5mm and steel grade 82B to be delivered to the production site from the production line of the raw material manufacturer. At this time, the wire rod is used immediately. It is generally required that the 82B wire rod should be placed at room temperature for a natural aging period of 15 days in summer and 30 days in winter. This natural limitation period brings troubles to downstream production turnover, high inventory pressure, and long product circulation cycle, which greatly occupies production funds. The freshly rolled 82B wire rod will have residual stress, and the hydrogen element in the steel has not escaped and diffused in time, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D6/00C21D11/00C23G1/08C23C22/13
CPCC21D9/52C21D6/00C21D11/00C23C22/13C23G1/08
Inventor 张宗前江渝吴光虎胡邮邮张青吴丽
Owner GUIZHOU WIRE ROPE
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