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Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel

A technology of grain-oriented electrical steel and nitrogen, applied in the field of steel rolling production, can solve the problems of high energy consumption, increased production cost, long process, etc., and achieves saving coating liquid usage, good insulation and punching properties, and saving gas consumption. Effect

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

AI Technical Summary

Problems solved by technology

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

Method used

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  • Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel
  • Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel
  • Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel

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Embodiment Construction

[0017] Describe below in conjunction with specific embodiment:

[0018] 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), the furnace shell is an airtight welded structure.

[0019] 1) Close the preheating furnace section, non-oxidizing heating furnace section, and radiant tube heating furnace section to keep them in the shutdown state.

[0020] 2) Turn on the soaking furnace section, and when the process temperature is 850-950°C, pass in nitrogen for purging, and control the furnace pressure to 20-50MPa.

[0021] 3) The main purpose of controlling the strip speed to 50~120 m / min and the flow rate of the circulating gas cooler is to control the plate temperature to 650°C t...

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Abstract

The invention discloses an annealing method for total nitrogen produced cold-rolled non-oriented electrical steel, and the method is as follows: closing a preheating furnace section, a non-oxidizing heating furnace section and a radiant tube heating furnace section to make the preheating furnace section, the non-oxidizing heating furnace section and the radiant tube heating furnace section in a shutdown state; entering a steel plate into a soaking furnace section, using the soaking furnace section for heating annealing of the steel plate, leading in nitrogen at the temperature of 850-950 DEG C; and controlling the strip steel speed below 120 m / min to enable the steel plate temperature to be 650-850 DEG C. The Furnace pressure is 20-50Pa. The product with an oxidized surface layer has good insulation and punching properties, the use of a coating liquid is saved or not needed, and gas consumption is saved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and relates to an annealing method for cold-rolled non-oriented electrical steel, in particular to an annealing method for producing cold-rolled non-oriented electrical steel with full nitrogen. Background technique [0002] Cold-rolled or hot-rolled silicon steel with low-grade (grades below 50W470) whose outer layer is oxidized or bluish has stable performance, and the insulation effect can be achieved with a thin coating or no coating. The outer silicon oxide steel is oxidized on the surface of ordinary silicon steel, that is, by applying coating liquid. This outer silicon oxide steel has the same purpose as ordinary silicon steel, and the silicon steel with the oxide layer has good punching performance. Blued silicon steel is a kind of uncoated silicon steel. Its general production method is to produce cold-rolled electrical steel by using the existing technology, and then th...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D1/74C21D9/52
Inventor 叶铁高振宇
Owner ANGANG STEEL CO LTD
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