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Rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel and preparation method thereof

A high-chromium ferrite and stainless steel technology is applied in the field of rare earth-containing ultra-pure high-chromium ferrite anti-wrinkle stainless steel materials and its preparation. The effect of solving continuous casting cracking and increasing the reduction of area

Inactive Publication Date: 2018-03-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the effects of using electromagnetic stirring and controlling the water flow in the secondary cooling section of continuous casting through the solidification process are not satisfactory. Therefore, it is necessary to study super ferritic stainless steel with fine-grained structure to improve processing performance.
[0004] Chinese Patent Application No. CN98801478 discloses a ferritic stainless steel plate with good resistance to deep drawing and wrinkle-like deformation and its manufacturing method. It restricts the content of main elements in stainless steel. The rolling temperature range, the invention patent does not involve the addition of rare earth
However, the research on ultra-pure high-chromium ferritic anti-wrinkle stainless steel containing rare earth is extremely rare.

Method used

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  • Rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel and preparation method thereof
  • Rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel and preparation method thereof
  • Rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] High chromium ferritic stainless steel needs to strictly control the process temperature in production. Because ferritic stainless steel has no phase transformation, when it is higher than 1050°C, the ferrite grows rapidly, which seriously affects the performance of the steel; at the same time, high-chromium ferritic stainless steel is easy to precipitate σ, Laves, etc. in the temperature range of 600-850°C Harmful precipitates, σ and Laves are chromium-rich phases, and their formation will cause the matrix to be poor in chromium, thereby seriously reducing the corrosion resistance of steel; at the same time, the hard and brittle σ and Laves phases will also affect the processing and mechanical properties of steel . The heat treatment process after hot rolling and cold rolling is to eliminate harmful phases. Considering comprehensively, and through a large number of experimental studies, the preparation of the rare earth-containing ultra-pure high-chromium ferritic ant...

Embodiment 2-6

[0064] In this example, on the basis of Example 1, the content of the chemical components added in Table 1 for the preparation of rare earth-containing ultra-pure high-chromium ferrite with good wrinkle resistance is specifically adopted, wherein the rare earth element RE is preferably pure Ce , pure Ce refers to the refined Ce block; according to the steel smelting, hot rolling, heat treatment and other process parameters in Table 2, the rare earth-containing ultra-pure high-chromium ferritic wrinkle-resistant stainless steel was prepared.

[0065] Table 1. Chemical composition list (unit is weight percent %)

[0066] serial number

C

N

Si

mn

P

S

Cr

Mo

Nb

Ti

Ni

O

RE

Example 2

0.0042

0.0074

0.35

0.38

0.0097

0.0041

26.69

3.12

0.26

0.20

2.44

0.0029

0.013

Example 3

0.0064

0.0084

0.42

0.39

0.0092

0.0033

27.03

3.35

0.30

0.21

2.49

0.0026

0...

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Abstract

The invention relates to a rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel and a preparation method thereof. The rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel is prepared from the following chemical components in percentage by weight: less than 0.015% of C+N (carbon+nitrogen), less than or equal to 1.0% of Si (silicon), less than or equal to 1.0% of Mn (manganese), less than or equal to 0.04% of P (phosphor), less than or equal to 0.03% of S (sulfur), 25.0% to 28.0% of Cr (chromium), 3.0% to 4.0% of Mo (molybdenum), 1.0% to 3.5% of Ni (nickle), 0.2% to 1.0% of Ti+Nb (titanium+niobium), less than 0.1% of rare earth element, and the balance of Fe (iron) and unavoidable impurities. The rare earth-containing superpure high-chromium ferrite anti-wrinkle stainless steel has the characteristics that the ferrite stainless steel with high chromium grade and low carbon and nitrogen content and containing Nb, Ti and rare elements is obtained, and the anti-wrinkle property is excellent; especially, the condensing tissues are fined, the segregation due to columnar crystals in the condensing process of casting ingots or casting blanks is reduced, the defect of surface wrinkles in the superpure high-chromium ferrite stainless steel in the rolling process is relieved, and the high-efficiency smelting of the super ferrite stainless steel is realized.

Description

technical field [0001] The invention belongs to the field of stainless steel products and its manufacture, and in particular relates to a rare earth-containing ultra-pure high-chromium ferrite anti-wrinkle stainless steel material and a preparation method thereof. Background technique [0002] The Cr content of super ferritic stainless steel is generally 25% to 30%, which belongs to high Cr ferritic stainless steel. Because of its high Cr and extremely low C and N content, it has excellent corrosion resistance and comprehensive mechanical properties, and is widely used in the condenser cooling equipment of Binhai Power Station. Compared with Ti tubes, it has excellent mechanical and anti-seismic properties, and its corrosion resistance is equal to or even better than that of Ti tubes, and its cost is lower due to its low Ni content. Compared with white copper tubes, its erosion resistance, pitting corrosion, crevice corrosion and other properties are more excellent. It has ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50
CPCC22C38/44C21D8/0226C21D8/0236C21D8/0247C22C38/001C22C38/005C22C38/02C22C38/04C22C38/48C22C38/50
Inventor 李阳杨光姜周华徐光杜鹏飞梁轶杰陈常勇姚聪林
Owner NORTHEASTERN UNIV
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