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Protective gas for annealing of metal materials

A technology of protective gas and metal materials, applied in the production of hydrogen, etc., can solve the problems of uneven mechanical properties, unsatisfactory surface quality, long annealing cycle, etc., achieve shortened annealing cycle, improve internal quality and surface quality, and improve annealing effect of ability

Inactive Publication Date: 2011-09-14
TIANJIN YIBO STEEL MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products after bright annealing have problems such as unsatisfactory surface quality, uneven mechanical properties, long annealing cycle, and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Ammonia decomposition equipment is used to prepare a mixture of hydrogen and nitrogen with a hydrogen content of 75% and a nitrogen content of 25%, which can be used as a protective gas after being dried and purified by a purification system.

[0008] The density of hydrogen is 1 / 14 that of nitrogen, and the thermal conductivity of hydrogen is 7 times that of nitrogen. Hydrogen is light in weight and strong in permeability. It can penetrate between the steel coil layers to give full play to the characteristics of large thermal conductivity and significantly improve heat transfer efficiency. Hydrogen is a reducing gas, which can reduce iron oxide to iron at high temperatures.

[0009] Make full use of the advantages and potential of hydrogen in annealing, improve the quality of annealing products and shorten the annealing cycle.

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PUM

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Abstract

The invention discloses protective gas for the annealing of metal materials. In the protective gas, mixed gas comprises 75 percent of hydrogen and 25 percent of nitrogen, and a ratio of the mixed gas containing the hydrogen and the nitrogen is appropriate; and the protective gas is easy and convenient to prepare and high in quality after annealing.

Description

Technical field [0001] The invention relates to a heat treatment process technology, in particular to a protective gas used for annealing of metal materials, which is suitable for a protective atmosphere strong circulation hood type bright annealing furnace. Background technique [0002] At present, when the strong-circulation hood-type bright annealing furnace is working, the furnace needs to be filled with protective gas. The originally used nitrogen-hydrogen protective gas contains 96-98% nitrogen and 2-4% hydrogen. The products after bright annealing have the problems of unsatisfactory surface quality, insufficient mechanical properties, long annealing cycle, and high energy consumption. Summary of the invention [0003] The problem to be solved by the present invention is to overcome the shortcomings of the existing ratio and provide a protective gas for annealing metal materials. The protective gas has a reasonable formula and simple preparation, and the produced products a...

Claims

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Application Information

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IPC IPC(8): C21D1/74C01B3/04
CPCY02E60/364Y02E60/36
Inventor 于付亭
Owner TIANJIN YIBO STEEL MAKING
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