Fire-resistant steel and preparation method thereof

A refractory and molten steel technology, applied in the field of refractory steel, can solve the problems of incompletely clear interaction mechanism of alloying elements, increase of industrial production cost, complex addition process, etc., optimize industrial preparation process and reduce the formation of irregularly shaped inclusions , The effect of simplifying the preparation process

Inactive Publication Date: 2019-04-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, those skilled in the art have gradually found that although adding elements such as Nb, Mo, Cr, V, Ti to steel is a very effective method to improve the high temperature strength of steel, however, due to the addition of various alloying elements, different alloying elements The difference in properties and the interaction between them, as well as the interaction mechanism between alloying elements and steel itself are not completely clear, and some inclusions may even be introduced that lead to deterioration of material properties; at the same time, more importantly, a variety of alloying elements in The addition process in the process of steel smelting is relatively complicated, which greatly increases the cost of industrial production and reduces the efficiency

Method used

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Examples

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preparation example Construction

[0041] On the other hand, the embodiment of the present invention also provides a preparation method of fire-resistant steel, the preparation method basically follows the continuous casting and rolling forming process of traditional threaded steel, and performs composition adjustment and Optimization, specifically including the following steps:

[0042]Step 1. Pretreating the molten iron to reduce harmful components in the molten iron to a set range. Preferably, this step is specifically: completing the initial deoxidation and desulfurization process of molten iron in the electric arc furnace, so that the harmful components of oxygen, sulfur, phosphorus, etc. inside the molten iron are reduced to the range required by steelmaking, so as to improve steelmaking efficiency.

[0043] Step 2, performing smelting treatment on the pretreated molten iron to obtain molten steel.

[0044] Among them, during the smelting process, carbon, ferrosilicon or silicon, ferromanganese or metal...

Embodiment 1

[0062] Step 1. Perform a pretreatment process on the molten iron in the converter, so that the harmful components such as oxygen, sulfur, and phosphorus inside the molten iron are reduced to the range required for steelmaking.

[0063] Step 2. Carry out refining treatment outside the furnace to the pretreated molten iron: add carbon, ferrosilicon or silicon, ferromanganese or metal manganese, aluminum to the molten iron, so that the composition of the molten steel obtained after the smelting treatment is: by weight percentage Calculated, carbon is 0.19%, silicon is 0.25%, manganese is 1.65%, aluminum is 0.015%, sulfur is 0.001%, and phosphorus is 0.004%. A La-Ce alloy for providing rare earth elements is added to finally obtain molten steel with a rare earth content of 0.036% (the balance is Fe and unavoidable impurities).

[0064] Step 3, then put the molten steel into the ladle according to the ordinary process, and lift it to the top of the continuous casting machine by the...

Embodiment 2

[0066] The main difference between Example 2 and Example 1 is that the composition of the molten steel obtained after the smelting treatment is: by weight percentage, carbon is 0.05%, silicon is 1.0%, manganese is 1.0%, aluminum is 0.02%, sulfur It is 0.001%, phosphorus is 0.003%, rare earth is 0.005%, and the balance is Fe and unavoidable impurities.

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PUM

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Abstract

The invention discloses fire-resistant steel and a preparation method thereof, and relates to the technical field of fire-resistant steel. According to the technical scheme mainly adopted, the fire-resistant steel comprises the following components including, by weight, 0.05-0.2% of carbon, 0-1.0% of silicon, 0-2.0% of manganese, 0.01-0.04% of aluminum, 0-0.005% of sulphur, 0-0.015% of phosphorus,50 ppm-500 ppm of rare earth and the balance Fe and inevitable impurities. The invention mainly provides the fire-resistant steel modified and optimized based on the rare earth element microalloyingprinciple and a preparation method thereof. While the fire-resistant steel is made to have a high-temperature service property, no Nb, Mo and V is added or the contents of the Nb, Mo and V are decreased, and the production cost of the fire-resistant steel is lowered.

Description

technical field [0001] The invention relates to the technical field of fire-resistant steel, in particular to a fire-resistant steel and a preparation method thereof. Background technique [0002] With the rapid development of the modern construction industry, the method of coating the surface of building materials with refractory coatings to improve fire resistance has been gradually abandoned by people. The main reasons are: the cost of buildings with surface coatings will increase, and the surface refractory coating The coating will affect people's health and will increase the pollution to the environment. Therefore, people gradually began to try to improve the fire-resistant performance of buildings from the perspective of building materials themselves, and one of the important directions is to strengthen the development of fire-resistant steel. The so-called fire-resistant steel refers to the general provisions that the yield strength at 600 ° C for 1 to 3 hours is gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/06
CPCC22C33/06C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06
Inventor 王培郭飞蒋中华李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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