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Method for realizing evenly cooling of strip steel

A technology of uniform cooling and strip steel, applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of uneven surface cooling, complex technical devices, lack of versatility, etc., achieve good stability and speed, improve cooling speed, The effect of reducing the formation of oxide film

Active Publication Date: 2009-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Description
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Problems solved by technology

The common problem of these methods is that it cannot solve the fluctuation of the jet water column itself, so that the temperature difference in the width direction of the strip is formed, resulting in uneven surface cooling.
[0010] The various vapor film suppression or elimination technical devices realized in the above patents are complicated, difficult to implement, have limitations, and lack of versatility

Method used

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  • Method for realizing evenly cooling of strip steel
  • Method for realizing evenly cooling of strip steel
  • Method for realizing evenly cooling of strip steel

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Embodiment Construction

[0029] Parameter determination in the jet:

[0030] Concentration 0.02-0.5% and molecular weight 2 million:

[0031] Based on the known empirical formula, it can be known that polyoxyethylene is added to the jet, and its stable range L is: L=(1+αc)L 0 . α is an empirical constant 2.5×10 2 , c is the relative mass concentration c of polyoxyethylene in water, which must satisfy c≤0.5%. L 0 is the stable range of the water jet in the initial state. The larger the molecular weight, the longer the molecular chain, and the polymer with a molecular weight lower than 2 million cannot effectively eliminate the effect of stabilizing the jet at the boundary of the vortex. figure 2 It shows the vortex phenomenon at the water boundary when no polyoxyethylene is added, and illustrates the role of polyoxyethylene molecular chains in eliminating eddy currents; image 3 Shown is the steady-state jet flow after adding polyoxyethylene to ensure jet velocity and pressure, thereby improving...

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Abstract

The invention discloses a method for realizing evenly cooling of strip steel. The method comprises the following steps that: a water soluble polymer or a copolymer with drag reduction property is added into cooling water, the concentration is 0.02 to 0.5 percent, and the molecular weight is more than 200 millions. Compared with the prior art, the method has the advantages that by adding the polymer in jet flow, the pressure of the jet flow is stronger, and the stability is more stable, so that the vapor film can be effectively and evenly eliminated; and the vapor film is made to be quickly thinned and disappears, thereby reducing the generation of an oxide film and improving the cooling speed.

Description

technical field [0001] The invention relates to the water-cooling technology for continuous annealing of cold-rolled steel strips, in particular to steel plates submerged in water during the water-cooling process, through cooling water and mixed jets containing additives, to eliminate eddy currents at the boundaries of the water jets and improve the speed and stability of the water jets , so that the steam film on the surface of the strip is quickly and evenly destroyed by the mixing jet. Background technique [0002] The core of continuous annealing development is the development of cooling technology. According to different cooling methods after soaking, the currently developed cooling methods are: gas jet cooling (GJC), high-speed gas jet cooling (HGJC), water cooling (WQ), roll cooling (RC), gas-water cooling ( AcC), hot water cooling (HOWAC), high-speed hydrogen injection cooling (H 2 -HGJC), water cooling + roll cooling (WQ+RC), roll cooling + gas jet cooling (RC+GJC...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D11/00
Inventor 熊斐杨赛丹
Owner BAOSHAN IRON & STEEL CO LTD
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