Corrosion resistance steel and production method thereof

A technology for corrosion-resistant steel and molten steel, which is applied in the field of alloy steel and can solve problems such as expensive alloying elements

Inactive Publication Date: 2013-11-20
ZUORAN JINGJIANG EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of sulfuric acid dew point corrosion-resistant steel by these methods often requires a large amount of expensive alloying elements

Method used

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  • Corrosion resistance steel and production method thereof
  • Corrosion resistance steel and production method thereof
  • Corrosion resistance steel and production method thereof

Examples

Experimental program
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preparation example Construction

[0039] The present invention also provides a preparation method for the above-mentioned corrosion-resistant steel, comprising the following steps:

[0040]A) 0.08-0.12wt% of C, 0.20-0.40wt% of Si, 0.36-0.65wt% of Mn, 0.70-1.10 of Cr, 0.25-0.45wt% of Cu, 0-0.035wt% of S, 0 ~0.035wt% P and Fe are mixed and smelted to obtain molten steel;

[0041] B) Put 0.05-0.3wt% rare earth into the bottom of the ladle, pour the first volume part of molten steel, add 0.08-0.10wt% Sb, then pour the second volume part of molten steel, and stir to obtain the sample Sample;

[0042] C) heat-treating the sample to obtain corrosion-resistant steel;

[0043] The Fe is the balance.

[0044] The present invention has no special limitation on the sources of all raw materials, which can be commercially available, and it is preferable to select relevant metal materials or alloy materials according to the content of metal elements. Wherein, the contents of the metal elements are the same as those menti...

Embodiment 1

[0058] 1.1 According to the composition of raw material elements: 0.1wt% C, 0.3wt% Si, 0.45wt% Mn, 1.0wt% Cr, 0.4wt% Cu, 0.10wt% Sb, 0.05wt% Y, S≤ 0.035wt%, P≤0.035wt% and the balance of Fe. Weigh mineral raw materials 10# steel, low chromium cast iron, red copper, antimony and rare earth Y, with a total weight of 8kg; manually knock and crush the rare earth Y block to 2-3mm powder.

[0059] 1.2 Heat the 10# steel weighed in 1.1 to 1600°C in a 10kg medium-frequency induction furnace and melt it. After the molten steel is melted, add low-chromium cast iron and red copper in sequence, and heat it to 1650°C. After deoxidation and slag removal on the molten steel surface, the electric furnace was turned off and sedated for 2 minutes, and then the electric furnace was turned on again to raise the temperature to 1650°C, and the aluminum wire deoxidation treatment and slag removal treatment were performed again to obtain molten steel.

[0060] 1.3 Put 4g of the rare earth Y powder o...

Embodiment 2

[0065] 2.1 According to the composition of raw material elements: 0.1wt% C, 0.3wt% Si, 0.45wt% Mn, 1.0wt% Cr, 0.4wt% Cu, 0.10wt% Sb, 0.15wt% Y, S≤ 0.035wt%, P≤0.035wt% and the balance of Fe. Weigh mineral raw materials 10# steel, low chromium cast iron, red copper, antimony and rare earth Y, with a total weight of 8kg; manually knock and crush the rare earth Y block to 2-3mm powder.

[0066] 2.2 Heat the 10# steel weighed in 2.1 to 1600°C in a 10kg medium-frequency induction furnace to melt. After the molten steel is melted, add low-chromium cast iron and red copper in sequence, and heat it to 1650°C. After deoxidation and slag removal on the molten steel surface, the electric furnace was turned off and sedated for 2 minutes, and then the electric furnace was turned on again to raise the temperature to 1650°C, and the aluminum wire deoxidation treatment and slag removal treatment were performed again to obtain molten steel.

[0067] 2.3 Put 12g of the rare earth Y powder obta...

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Abstract

The present invention provides a corrosion resistance steel and a production method thereof. The method comprises: carrying out mixing smelting on C, Si, Mn, Cr, Cu, S, P and Fe to obtain molten steel; placing rare earth into the bottom of a pouring ladle, pouring a first part by volume of the molten steel, adding Sb, pouring a second part by volume of the molten steel, and stirring to obtain a sample; and carrying out a heat treatment to obtain the corrosion resistance steel. Compared with the corrosion resistance steel in the prior art, the corrosion resistance steel of the present invention has the following characteristics that: 1, rare earth is adopted as trace elements to be added to the steel, such that the structure can be refined, and the rare earth can react with sulfur and oxygen in the steel to produce high melting point rare earth compounds so as to reduce harms of sulfur and oxygen inclusions and increase corrosion resistance of the steel; 2, rare earth elements have large atomic radiuses, such that brittleness precipitation in the second phase grain boundary can be reduced so as to increase corrosion resistance of the steel; and 3, with addition of rare earth and Sb, burning loss of rare earth elements can be reduced, utilization rates of rare earth elements can be increased, and the metal Sb can be completely and uniformly dissolved so as to uniformize structure components and increase corrosion resistance of the steel.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a corrosion-resistant steel and a preparation method thereof. Background technique [0002] In the industrial production process of the petrochemical industry, various corrosive media are often encountered, such as various strong acids (nitric acid, sulfuric acid, etc.), various organic acids (acetic acid, formic acid, etc.), various salt solutions (seawater, etc.) etc.) and an atmosphere containing corrosive gas and water vapor, which will have a strong corrosive effect on the containers, reaction towers, pipes, various pumps, etc. used in the production process. In order to produce safe and reliable operations, appropriate metals should be selected materials to manufacture these devices. The addition of certain alloying elements to steel can effectively improve the corrosion resistance of steel, and this type of alloy steel is called corrosion-resistant steel. ...

Claims

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Application Information

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IPC IPC(8): C22C38/60B22D1/00
Inventor 高义民张锦红皇志富邢建东王欣欣张军
Owner ZUORAN JINGJIANG EQUIP MFG
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