JPS5839743A - Heat treatment and water cooling apparatus thereof - Google Patents

Abstract

PURPOSE:To simultaneously carry out the anticorrosive treatment and cooling of a metallic strip by passing the strip through a heating chamber in nonoxidizing atmosphere, introducing the strip heated to a high temp. into an air cooling chamber, blowing a nonoxidizing gas at a low temp., and introducing the strip cooled to a specified temp. into a tank for cooling water incorporated with a corrosion inhibitor. CONSTITUTION:A metallic strip 1 is passed through a heating chamber 5 filled with a nonoxidizing atmospheric gas. The strip 1 heated to a prescribed high temp. is introduced into an air cooling chamber 6, where a nonoxidizing gas is blown at a low temp. to cool the strip 1 to 150-300 deg.C. The cooled strip 1 is further cooled to <=80 deg.C by immersion in a cooling water tank 7 holding cooling water incorporated with a corrosion inhibitor. The tank 7 has been installed over a receiving tank 10 for receiving overflowing cooling water, and the water in the tank 10 is returned to the tank 7 through a circulating pump 11, piping 12 and a cooler 13. A temp. sensor 14 put in the tank 7 detects the temp. of the water, and the cooler 13 is worked so as to maintain the water at the prescribed temp.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat treatment method for brightly annealing a metal strip such as a steel alloy material, and a water-cooled cooling device used in the heat treatment method.

For example, when brightly annealing a copper alloy strip, conventionally, the metal strip is heated to a predetermined high temperature in a heating chamber, then cooled to near room temperature in a cooling chamber under a non-oxidizing atmospheric gas, and then as needed. Then, the 9 pieces of metal were immersed in a rust preventive tank containing a rust preventive agent, and in order to further increase the rust preventive effect, they were immersed in a hot water wash tank with wrinkled strips, heated to 10K, and then dried at 11K. As a result, the strip line becomes long and the equipment cost is high.Also, since cooling and heating are repeated, thermal energy is wasted and the running cost is high.

The present invention aims to solve the above-mentioned drawbacks, and is a major breakthrough in saving equipment and energy by simplifying the process by adding cooling, rust prevention, and hot water washing.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a layout diagram of a strip line to which this heat treatment method is applied, in which a metal strip 1 is fed into a heating chamber 6 from an unwinding device 2 at one end through a guide roll 3 and a tension control roll group 4.

The heating w16 is performed by using a direct-fired heating furnace that performs reductive combustion using a direct-fired burner installed in the furnace, or by supplying reducing gas or inert gas into the furnace using a radiant 1-burner installed in the furnace. The furnace is filled with a non-oxidizing atmosphere gas at a high temperature (11 for steel alloys) at which the desired hardness, tensile strength, elongation, grain size, etc. can be obtained for the metal strip 1.
so@c ~yso@c') IC heating. Reference numeral 6 denotes an air-cooled room into which the strip 1 manufactured by the company is introduced, and in the air-cooled room, a low-temperature non-oxidizing atmospheric gas cooled by a cooler (not shown) is blown onto the metal strip. '
Cool at 0~300''C1.

A water-cooled cooling device shown in FIG. 2 is provided next to the air-cooled chamber e, and the metal strip 1 is immersed in a cooling water tank T of the water-cooled cooling device. The cooling water tank has a metal strip 1 on the opposite side wall 8.8.
A seal roll 9 is provided at the entrance/exit to allow cooling water to be stored at a higher water level than the entrance/exit. A receiver tank I is formed to receive the water, and the receiver tank I and the cooling water tank T are connected. # by l-ring pump H! r A colander is interposed in the pipe u, and the cooling water in the receiving tank I is constantly circulated to the cooling water tank T. 14 is a temperature sensor that detects the temperature of the water in the cooling water tank 7, and the amount of cooling water that is passed to the cooler n so that the detected temperature is maintained at a predetermined value is determined by the intransitive *
*Controlled by the person in charge. 16 is a level switch that detects the water level in the water tank W and operates an automatic water supply valve provided in the water supply pipe ν so that the water level is maintained within a certain range. However, a known rust preventive agent is mixed into the cooling water for the lever, but 1
9 is a concentration sensor that detects the concentration of the rust preventive agent, and 9 is a pipe that replenishes the rust preventive agent to the cooling water tank 7, and an automatic control valve 21 provided there is used to adjust the concentration to the concentration indicated by the concentration indicator controller 4. The automatic control valve provides negative control to maintain the rust preventive concentration in the tank. 23 is a ringer roll for wiping away moisture. In addition, Chiku is a drying room that blows warm air on both sides of the metal strip 1, part is a roll group for tension control of winding N@, 26 is a guide roll, and l is a winding device.

For this reason, air cooling room 6/! The metal strip 1, which has been cooled from 0"C to 300@C, is then placed in a cooling water tank 7 containing a rust preventive agent, and subjected to rust prevention treatment and at the same time is water cooled to
After being cooled down to a temperature below, it is dried in a drying room. In this case, once the metal strip 1 is
! Air cooling to an intermediate temperature between 0 and 3000C causes the metal strip to undergo thermal stress and wrinkles due to sudden water cooling! This is to prevent deformation such as I from occurring. In addition, generally known rust inhibitors are
In this case, a rust preventive agent is mixed into the cooling water and the remaining heat during cooling is utilized to improve the efficiency of the rust preventive treatment.

As explained above in the embodiments, the heat treatment method of the present invention is to heat a metal strip by cooling it in the air.
By cooling it to 300'C and then passing it through cooling water to cool it to below to''c, it is possible to perform both cooling and rust prevention treatment at the same time, so the equipment is efficient and the line length is short, reducing equipment costs. This is extremely beneficial as it reduces the amount of carbon dioxide and saves thermal energy.Also, the water-cooled cooling system used for this process automatically controls temperature and rust preventive concentration. The desired heat treatment can be easily achieved.

[Brief explanation of drawings]

FIG. 7 is a layout diagram of a slip line to which the heat treatment method of the present invention is applied, and FIG. 2 is a schematic diagram showing an embodiment of a water-cooled cooling device. 1...Metal strip, 5...Heating chamber, 6...
...air cooling room, 7...cooling water tank, 8...side wall, short...receiving tank, 11...circulation pump, 12...
Piping, 13... Cooler, 14... Temperature sensor,
15...Automatic control valve, 1g...Concentration sensor,!
1...Automatic yosetsuben. Patent applicant: Daido Steel Co., Ltd.

Claims (1)

[Scope of Claims] 1. A heating chamber filled with non-oxidizing atmospheric gas (metallic gas)
The scissors metal strip was heated to a predetermined high temperature by passing through the lip, then the metal strip was guided into a cool air chamber and a low-temperature non-oxidizing atmosphere gas was blown onto it.
0, and then immersed the metal strip in a cooling water tank filled with cooling water mixed with a rust preventive agent.
(A heat treatment method characterized by cooling to below 100 ml.) 1. A receiving tank is formed at the bottom of a cooling water tank in which openings and exits of metal strips are provided on opposing side walls to receive cooling water overflowing from the cooling water tank, A circulating pump connects the receiving tank and the cooling water tank, and a cooler is interposed in the piping, a temperature sensor is provided to detect the water temperature in the cooling water tank, and the cooler is operated so that the detected temperature is maintained at a predetermined value. At the same time, a concentration sensor was provided to detect the concentration of the rust preventive agent in the cooling water tank, and an automatic control valve was configured to be controlled by the signal from the concentration sensor in order to supply the rust preventive agent to the cooling water tank. A water-cooled cooling capacity characterized by: