Method and device for spray evaporation cooling of hot-rolled high-strength rebar

Abstract

The invention discloses a method and a device for spray evaporation cooling of a hot-rolled high-strength rebar, and belongs to the technical field of steel rolling. The device comprises a water and air supply system, six segments of a spray evaporation cooling device, infrared thermometers and a computer operating system, wherein the water and air supply system is composed of a main water pipe, a filter screen, a main air pipe, an air storage tank, a valve bracket system, a water supply pipe and an air supply pipe. Pressure gauges and flow gauges of the valve bracket system transmit pressure parameters and flow parameters of water and air supply to the computer operating system through long-distance instrument signals. According to the device for spray evaporation cooling of the hot-rolled high-strength rebar, grain refinement and bainite transformation are controlled through a grouped and segmented stepped accelerated cooling mode of spray evaporation cooling nozzles, so that strength of the hot-rolled rebar is improved remarkably and required elongation, yield strength ratio and anti-seismic property are acquired on the premise of avoiding martensite ring formation caused by conventional through water cooling, alloy content and new water consumption are reduced, and red rust on the surface of the rebar due to through water cooling is prevented.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling, and particularly relates to a water mist vaporization cooling device and method for hot-rolled high-strength steel bars [A Method and Device of Spray Evaporative Cooling (SEC) for Hot-Rolled High-Strength Rebar]. Background technique [0002] At present, countries around the world generally adopt the water-through cooling method to control and cool the hot-rolled steel bars after rolling to improve the strength of the steel bars. After the Belgian Institute of Metallurgy CRM developed Tempcore through water cooling technology in the 1970s [1,2] In Europe and the Commonwealth of Nations, most of the countries in Europe and the Commonwealth of the Commonwealth adopt this water-through cooling method, which uses the residual heat of the steel core to temper the surface quenched martensite, and obtain the tempered martensite ring on the surface of the steel section. The core obtains ferrite-pearlite...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a water mist vaporization cooling device and method for hot-rolled high-strength steel bars, to solve the above-mentioned problems of martensite rings on the surface and red rust on the surface caused by the water-through cooling process

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