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Water hammer prevention method for medium plate quenching machine

A quenching machine, steel plate technology, applied in quenching devices, heat treatment equipment, furnaces, etc., can solve problems such as water pressure fluctuations, and achieve the effect of reducing water hammer

Active Publication Date: 2020-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method of water-proof hammer for medium and thick plate quenching machine, which solves the problem of overpressure of the high pressure 0.8MPa and low pressure 0.4MPa water pressure of the quenching machine; solves the problem of high pressure 0.8MPa and low pressure 0.4MPa water pressure of the quenching machine Fluctuation issue; water hammer issue with quenching machine finally resolved

Method used

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  • Water hammer prevention method for medium plate quenching machine
  • Water hammer prevention method for medium plate quenching machine
  • Water hammer prevention method for medium plate quenching machine

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Take the quenching process of NM400 steel plate with a thickness of 30mm as an example. The length of the steel plate is 20m. figure 1 The application technology of the quenching process of the arranged quenching machine is taken as an example to further describe the process method. attached figure 1The first zone of the roller hearth heating furnace heats the steel plate to 900°C, and the steel plate is sent to the attached figure 1 Quenching to 50°C in zone 2 of the quenching machine, and the quenched steel plate is sent to the attached figure 1 Cooling bed zone 3. Among them, there are 4 groups of high-pressure section coolers and they are fully opened, and the attached diameter is DN800. figure 2 The water supply main pipe 8 of the high pressure section will have a flow rate of 4200m 3 0.8MPa high-pressure water per hour passes through two attachments with a diameter of DN600 figure 2 The branch bellows 9 of the high-pressure section is sent to the attached ...

Embodiment 2

[0043] Take the normalized cooling process for the production of 60mm thick Q390 steel plate as an example. The length of the steel plate is 18m. figure 1 The application technology of the normalized cooling process of the arranged quenching machine is taken as an example to further describe its process method. attached figure 1 The first zone of the roller hearth heating furnace heats the steel plate to 850°C, and the steel plate is sent to the attached figure 1 The 2nd zone of the quenching machine is normalized and cooled to 610°C, and the steel plate after normalized cooling is sent to the attached figure 1 Cooling bed zone 3. Among them, the coolers in the high-pressure section are not open and empty, and the coolers in the low-pressure section have a total of 18 groups and are fully opened. Attached with a diameter of DN800 figure 2 The flow rate of the low-pressure section water supply main pipe 13 is 4800m 3 / h of 0.4MPa low-pressure water through four attachments...

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Abstract

The invention provides a water hammer prevention method for a medium plate quenching machine, and belongs to the technical field of metal heat treatment cooling. The method comprises the following technological processes of heating a steel plate with the thickness range of 8-120mm to 800-980 DEG C by a roller hearth heating furnace, conveying the heated steel plate to a furnace rear quenching machine area by a conveying roller way to quench the heated steel plate to room temperature or normalize and cool the heated steel plate to be lower than or equal to 680 DEG C, and conveying the cooled steel plate to a cooling bed through the conveying roller way. According to the water hammer prevention method, a buffer water drum is additionally arranged between a water supply main pipe and a coolerwater supply branch pipe, the water supply main pipe and the buffer water drum are connected through a multi-branch corrugated pipe, the two ends of the water supply main pipe are provided with pressure maintaining and releasing valves separately, a cooler pneumatic opening and closing valve is additionally provided with a speed regulation module and is opened and closed in a time-staggered manner and an overpressure alarm is given. After the water hammer prevention method is adopted, it is guaranteed that the high-pressure water pressure of the quenching machine is stabilized at 0.8 MPa + / -0.02 MPa, and the low-pressure water pressure is stabilized at 0.4 MPa + / -0.02 MPa; and the phenomena of water hammer and water pressure fluctuation of the quenching machine are avoided, and the structure performance of the steel plate subjected to quenching and normalizing and cooling by the method well meets the requirements.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment and cooling, in particular to a hammer-proof method for a medium-thick plate quenching machine. Background technique [0002] Quenching is the most widely used process method in steel heat treatment process. The quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to make it fully or partially austenitized, and then cool it at a temperature greater than the critical cooling rate. The heat treatment process of rapid and rapid cooling to below Ms (or isothermal near Ms) for martensite (or bainite) transformation. It is a heat treatment method to obtain an unbalanced structure dominated by martensite (there is also a heat treatment method to obtain bainite or maintain single-phase austenite according to needs). Due to the decrease in strength of some ferrite+pea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D1/62C21D9/00
CPCC21D1/62C21D9/0081C21D11/005
Inventor 刘涛余伟陈雨来江海涛米振莉张立杰井梁詹智敏
Owner UNIV OF SCI & TECH BEIJING
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