Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel

A technology of oriented electrical steel and annealing, which is applied in the field of steel rolling production, can solve the problems of high cost, high energy consumption, and long process, and achieve the effects of saving coating liquid, reducing the thickness of the insulating layer, and good punching performance

Active Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is longer and energy consumption is higher, which ultimately leads to higher costs

Method used

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  • Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel
  • Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel
  • Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel

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Embodiment Construction

[0019] Describe below in conjunction with specific embodiment:

[0020] The present invention adopts a horizontal continuous annealing furnace. The annealing furnace has a total length of 295m, consisting of 2 sections of preheating furnace (PH), 5 sections of non-oxidizing heating furnace (NOF), 5 sections of radiant tube heating furnace (RTF), 14 sections of soaking furnace (SF), and circulating protective gas cooler (RJC) composition. The furnace shell is an airtight welded structure.

[0021] 1) The nitrogen circulation in the control circulation gas cooler, the oxygen content is 800±50ppm.

[0022] 2) Control the cooling fan output of the circulating cooler so that the plate temperature leaving the circulating cooler is 400±30°C.

[0023] 3) Control the dew point of the soaking furnace to 20±5°C.

[0024] 4) The dew point of the circulating cooler is controlled at 20±5°C.

[0025] Table 1 embodiment and routine process control

[0026]

[0027] Through the above ...

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Abstract

The invention discloses an annealing method of external layer-oxidized cold-rolled non-oriented electrical steel. The circulation in a circulating gas cooler of a continuous annealing furnace is nitrogen circulation, and the oxygen content is 600-1000 ppm; the plate temperature when the steel plate exits the circulating cooler is 200-450 DEG C; the dew point of the circulating cooler is 40 to -40 DEG C; the dew point of a soaking pit furnace is 60 to -60 DEG C. The product with surface oxidation has good insulating properties and punching performance; the insulating layer thickness is decreased to realize the purpose of saving coating solution; the short-flow production of silicon steel with an oxide layer on the surface is realized; and bluing silicon steel can be produced directly.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and relates to a production method of cold-rolled non-oriented electrical steel, in particular to an annealing method of cold-rolled non-oriented electrical steel whose outer layer is oxidized. Background technique [0002] At present, the domestic cold-rolled silicon steel production of cold-rolled non-oriented silicon steel continuous annealing coating unit generally adopts a horizontal continuous annealing furnace. The annealing furnace is composed of a preheating furnace, a non-oxidizing heating furnace, a radiant tube heating furnace, a soaking furnace, and a circulating protective gas cooler. The furnace shell is an airtight welded structure to achieve bright annealing. The preheating furnace is used to burn residual gas and hydrogen. The non-oxidizing furnace is heated by an open flame. The main purpose is to quickly heat the steel plate. The steel plate is heated and he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C23C8/14
Inventor 叶铁高振宇白日沈福涛
Owner ANGANG STEEL CO LTD
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