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Method for preparing foamed steel through foaming

A foam steel and composite blowing agent technology, applied in the field of foam steel production, can solve the problems of not being able to effectively control the reaction effect of the foaming agent, increasing the residence time, and having no substantial effect, so as to achieve rapid solidification, Improved 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

In this technical scheme, a stainless steel mesh is used to cover the foaming agent to prevent the foaming agent from floating up and increase the time that the molten steel stays in the decomposition temperature range of the foaming agent, but it can only play a role in delaying, and cannot Effectively control the reaction effect of the blowing agent, without substantial effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In the present embodiment, the preparation process of foamed steel is specifically as follows:

[0046] 1. Nano-CaCO 3 Mixed with iron powder: nano CaCO 3 The particle size is 100 nanometers; the Fe content in the iron powder is 99.93%, and the particle size of the iron powder is 400 mesh; nano-CaCO 3 Mix with iron powder at a mass ratio of 1:10; use a ball mill for mixing, and the mixing time is 5 hours. Iron powder can realize the dispersion of nano-materials, thereby obtaining a uniform mixed powder. The mixture of nano-CaCO3 and iron powder is cold-pressed into a block of 10mm×10mm×50mm by a press under a pressure of 3MPa to obtain a tackifier.

[0047] 2. Manganese nitride and chromium nitride mixed: the particle size of manganese nitride and chromium nitride is 40 microns, the nitrogen content in manganese nitride is 8%, the nitrogen content in chromium nitride is 7%, the manganese nitride and nitrogen Chromium is mixed in a mass ratio of 1:2.

[0048] 3. Molt...

Embodiment 2

[0053] In the present embodiment, the preparation process of foamed steel is specifically as follows:

[0054] 1. Nano-CaCO 3 Mixed with iron powder: nano CaCO 3 The particle size is 70 nanometers; the Fe content in the iron powder is 99.95%, the particle size of the iron powder is 200 mesh, and the nanometer CaCO 3 Mix with iron powder at a mass ratio of 1:20; use a ball mill for mixing, and the mixing time is 2 hours. Iron powder can realize the dispersion of nano-materials and obtain a uniform mixed powder. The nano-CaCO 3 The mixture with iron powder is cold-pressed into a block of 10mm×10mm×50mm to obtain a tackifier.

[0055] 2. Manganese nitride and chromium nitride mixed: the particle size of manganese nitride and chromium nitride is 60 microns, the nitrogen content in manganese nitride is 7%, the nitrogen content in chromium nitride is 10%, the manganese nitride and nitrogen Chromium is mixed in a mass ratio of 1:1.

[0056] 3. Molten steel melting: Vacuum induct...

Embodiment 3

[0061] In the present embodiment, the preparation process of foamed steel is specifically as follows:

[0062] 1. Nano-CaCO 3 Mixed with iron powder: nano CaCO 3 The particle size of the iron powder is 20 nanometers; the Fe content in the iron powder is 99.96%, the particle size of the iron powder is 100 mesh, and the nanometer CaCO 3 Mix with iron powder at a mass ratio of 1:15; use a ball mill for mixing, and the mixing time is 4 hours. Iron powder can realize the dispersion of nano-materials and obtain a uniform mixed powder. The nano-CaCO 3 The mixture with iron powder is cold-pressed into a block of 10mm×10mm×50mm to obtain a tackifier.

[0063] 2. Manganese nitride and chromium nitride mixed: the particle size of manganese nitride and chromium nitride is 80 microns, the nitrogen content in manganese nitride is 5%, the nitrogen content in chromium nitride is 15%, the manganese nitride and nitrogen Chromium is mixed in a mass ratio of 1:3.

[0064] 3. Molten steel mel...

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Abstract

The invention relates to a method for preparing foamed steel by foaming, which comprises the following steps of: firstly adding a tackifier which is composed of nano CaCO3 and iron powder and has a foaming effect into smelted molten steel, then adding a composite foaming agent composed of manganese nitride and chromium nitride, foaming under vacuum, and cooling to obtain the foamed steel. The mixture of chromium nitride and manganese nitride is used as the composite foaming agent, continuous foaming can be achieved, control over the foaming process is better facilitated, and therefore the performance of the foamed steel is guaranteed; meanwhile, nano calcium oxide generated after the tackifier nano calcium carbonate with the foaming effect is decomposed is uniformly dispersed in the steel and serves as a heterogeneous core of molten steel solidification, rapid solidification of the molten steel is facilitated, and therefore the performance of the foamed steel is improved.

Description

technical field [0001] The invention relates to the technical field of foam steel production, in particular to a method for preparing foam steel by foaming. 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 method, metal deposition method, ho...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C1/08
CPCC22C33/04C22C1/08C22C1/086
Inventor 李广帮魏崇一廖相巍尚德礼常桂华吕春风
Owner ANGANG STEEL CO LTD