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Method for preparing foam steel through recarburization, injection and rapid cooling

A technology of foam steel and recarburizer, applied in the field of foam steel production, to achieve the effects of uniform performance, guaranteed performance, and simple process

Active Publication Date: 2022-05-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution is to pass gas into the solidified metal to make the metal porous. Only micro-nano pores of several hundred nanometers or several microns can be formed in the metal. It is only a porous metal, and strictly speaking, it does not not foam steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, a method for preparing foamed steel by carbon injection and rapid cooling is as follows:

[0034] 1. Molten steel smelting: use an induction furnace to melt steel raw materials, and the temperature of molten steel after heating and melting is controlled at 1550°C.

[0035] 2. Carburizing of molten steel: adding carburizing agent to molten steel, the carbon content in the carburizing agent is 95%, so that the carbon content in molten steel is increased to 0.1%.

[0036] 3. CO injection 2 : Inject CO into molten steel after carburization 2 , the injection pressure is 0.4Mpa, the injection flow rate is 1 liter / hour, and the injection time is 6 minutes; when the temperature is above 850°C, the ratio of CO to CO 2 The existence of CO is more stable, and the generation of CO is an endothermic reaction, and the high-temperature molten steel provides a large amount of heat, which is beneficial to CO 2 Chemical reaction with C in steel, ie CO 2 +C=2CO↑, t...

Embodiment 2

[0040] In the present embodiment, a kind of rapid cooling method for preparing foamed steel is as follows:

[0041] 1. Molten steel smelting: Induction furnace is used to melt steel raw materials, and the temperature of molten steel after heating and melting is controlled at 1520°C.

[0042] 2. Carburizing of molten steel: adding carburizing agent to molten steel, the carbon content in the carburizing agent is 92%, so that the carbon content of molten steel is increased to 0.5%.

[0043] 3. CO injection 2 : Inject CO into molten steel after carburization 2 , the injection pressure is 0.3Mpa, the injection flow rate is 2 liters / hour, and the air blowing time is 5 minutes; when the temperature is above 850°C, the ratio of CO to CO 2 The existence of CO is more stable, and the generation of CO is an endothermic reaction, and the high-temperature molten steel provides a large amount of heat, which is beneficial to CO 2 Chemical reaction with C in steel, ie CO 2 +C=2CO↑, the am...

Embodiment 3

[0047] In the present embodiment, a kind of rapid cooling method for preparing foamed steel is as follows:

[0048] 1. Molten steel smelting: use an induction furnace to melt steel raw materials, and the temperature of molten steel after heating and melting is controlled at 1480°C.

[0049] 2. Carburizing molten steel: adding a carburizing agent to the molten steel, the carbon content of which is 90%, so that the carbon content in the molten steel is increased to 1.0%.

[0050] 3. CO injection 2 : Inject CO into molten steel after carburization 2 , the injection pressure is 0.2Mpa, the injection flow rate is 0.5 liters / hour, and the air blowing time is 3 minutes; when the temperature is above 850°C, the ratio of CO to CO 2 The existence of CO is more stable, and the generation of CO is an endothermic reaction, and the high-temperature molten steel provides a large amount of heat, which is beneficial to CO 2 Chemical reaction with C in steel, ie CO 2 +C=2CO↑, the amount of ...

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Abstract

The invention relates to a method for preparing foamed steel by recarburization, injection and rapid cooling, which comprises the following steps: adding carbon into smelted molten steel to increase the carbon content in the molten steel, injecting CO2 into the recarburized molten steel, and reacting the CO2 with the carbon in the steel to generate CO; and the reacted molten steel is rapidly poured into a mold with a water cooling device, so that the molten steel is rapidly cooled and solidified, and the foamed steel with uniform bubbles is obtained. According to the method, CO2 gas is injected to react with carbon in molten steel to generate CO gas, the CO gas is retained in the steel in the form of bubbles, and then the foam steel with uniformly distributed bubbles is obtained through rapid cooling.

Description

technical field [0001] The invention relates to the technical field of foamed steel production, in particular to a method for preparing foamed steel by carbon injection and rapid cooling. Background technique [0002] Foamed steel is a structure-function integrated material with a large number of connected or disconnected holes evenly distributed in the steel matrix. As a functional material, it has various properties such as sound absorption, heat insulation, flame retardancy, and electromagnetic shielding. As a structural material, by changing the porosity and pore structure, the steel density, elastic modulus and yield strength can be changed. In the case of the same amount of steel, a reasonable design can effectively improve the overall stability and local stability of structural members, thereby increasing the bearing capacity and achieving the purpose of saving steel. [0003] At present, the preparation methods of foam steel mainly include molten metal foaming meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/072C21C7/00B22D25/00B22D27/04
CPCC22C33/04C21C7/072C21C7/0025B22D25/005B22D27/04
Inventor 李广帮魏崇一廖相巍尚德礼常桂华吕春风
Owner ANGANG STEEL CO LTD
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