A ferritic stainless steel with good toughness and corrosion resistance and its manufacturing method

A technology of corrosion resistance and manufacturing method, applied in the field of ferritic stainless steel and its manufacturing, can solve the problems of not involving the influence of toughness, not involving the corrosion resistance of sulfuric acid, etc. The effect of expanding the scope of application

Active Publication Date: 2021-04-02
BAOSTEEL DESHENG STAINLESS STEEL
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Problems solved by technology

[0010] The above-mentioned patent focuses on optimizing the alloy composition and hot-rolling process, so as to improve the toughness of the material, especially the toughness at room temperature, and does not involve the influence of Ni element on the toughness of ferritic stainless steel; Corrosion research also focuses on conventional pitting corrosion resistance and crevice corrosion resistance, and does not involve research on sulfuric acid corrosion resistance

Method used

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  • A ferritic stainless steel with good toughness and corrosion resistance and its manufacturing method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with embodiment.

[0033] Table 1 shows the composition of the steel examples of the present invention and comparative examples, and Table 2 and Table 3 show the properties of the steel examples of the present invention and comparative examples.

[0034]It can be seen that for low carbon and nitrogen medium chromium ferritic stainless steel (chromium content between 19.0% and 24.0%), with the increase of Ni content (comparative example 1 and comparative example 2), that is, the Ni content increases from 0.5% After reaching 1.5%, its sulfuric acid corrosion resistance increases, the corrosion weight loss rate decreases from 245 μg to 198 μg, and the corrosion resistance is still low, which does not belong to the protection scope of the present invention.

[0035] When the Ni content increased to more than 2.0% (Example 1), even though its chromium content was lower than that of Comparative Examples 1 an...

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Abstract

The invention relates to a ferrite stainless steel with good toughness and good corrosion resistance, and a manufacturing method thereof. The ferrite stainless steel comprises, by weight, 0.002-0.02% of C, 0.002-0.02% of N, 0.05-0.60% of Si, 0.05-0.60% of Mn, 19.0-24.0% of Cr, 2.0-4.0% of Ni, 0.01-0.10% of Zr, 0.1-0.7% (0.1 inclusive and 0.7 inclusive) of Nb + Ti + Zr, 0.4% or less of Ti, and the balance of Fe and inevitable impurities. The ferrite stainless steel ha good room temperature toughness and good sulfuric acid corrosion resistance, the room toughness of the ferrite stainless steel is 70 J or above, and the sulfuric acid corrosion resistance weight loss is less than 1.0 [mu]g / mm<2>h.

Description

technical field [0001] The invention relates to ferritic stainless steel and a manufacturing method thereof, in particular to a ferritic stainless steel with good toughness and corrosion resistance and a manufacturing method thereof. Background technique [0002] Ferritic stainless steel does not contain or only contains a small amount of nickel. It is low in cost and has good stamping performance. Therefore, it is widely used in various aspects of daily life such as buildings, household appliances, kitchen products, and automobile exhaust systems. However, compared to the typical face-centered cubic structure of 304 austenitic stainless steel, ferritic stainless steel has a body-centered cubic crystal structure, which determines that it will inevitably appear cold and brittle. The ductile-brittle transition temperature of ordinary ferritic stainless steel is above room temperature except for the low-chromium type, and as the thickness increases, its room temperature toughne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/48C22C38/50
CPCC21D8/0226C21D8/0273C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/48C22C38/50
Inventor 杜伟张伟张鑫许海刚吴狄峰奚雅敏
Owner BAOSTEEL DESHENG STAINLESS STEEL
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