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Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate

A technology of corrosion resistance and treatment process, which is applied in the optimization of corrosion resistance of austenitic stainless steel components, and in the field of metallurgy, can solve the problems of long annealing cycle, coarse grain structure, discount of GBCD optimization effect, etc., to improve intergranular corrosion The effects of resistance, grain shedding reduction, and simplified optimization process

Inactive Publication Date: 2011-05-11
SHANDONG UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

For the first optimization process, the annealing period is too long and the grain structure is coarse, which is not conducive to the industrial production of the optimization method.
In the second optimization process, although the alloy samples after 6% cold rolling have more or less increased the proportion of special grain boundaries on the original basis in the subsequent annealing process, the optimization effect of the grain boundary characteristic distribution is not good. Stable, such as 6% deformation alloy sample is annealed at 900 ℃ for a long time (48h and 72h), the optimization effect of the distribution of grain boundary characteristics is not obvious
In addition, the previous experiments found that when the initial state of the alloy changes, its GBCD optimization effect is also greatly reduced

Method used

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  • Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate
  • Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate
  • Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The hot-rolled 316 austenitic stainless steel plate is optimized. The alloy composition is (mass ratio, wt%): 0.013C, 0.69Si, 0.96Mn, 0.31P, 0.001S, 17.4Cr, 12.45Ni, 2.0Mo, The initial sample grain size was 20 μm.

[0036] In the first step, using a Φ180 two-roller test rolling mill, the hot-rolled plate is subjected to cold-rolling deformation with a reduction of 4%.

[0037] In the second step, the cold-rolled alloy plate is annealed. The temperature rise rate of the vacuum annealing furnace is 20-30°C / min, and it is kept at 925°C for 80-90 minutes, then water-cooled to obtain an incomplete recrystallized structure; Keep warm at ℃ for 10-15 minutes (heating rate is 20-30 ℃ / min), water-cooled; repeat the process of the previous step 2 times.

[0038] The corrosion-resistant Cr-Ni stainless steel plate obtained after optimization treatment was tested by EBSD, and its grain boundary ratio and reconstruction diagram are shown in Table 1 and Figure 4 shown. The proport...

Embodiment 2

[0042] The 304 austenitic stainless steel plate that has been solid-solved at 1050°C for 30 minutes is optimized. S, 0.07Mo, initial sample with a grain size of 15 μm.

[0043] In the first step, the stainless steel plate is first subjected to cold rolling deformation with a reduction of 5%.

[0044] In the second step, the cold-rolled alloy plate is kept at 920°C for 70-80 minutes (the heating rate is 20-30°C / min), water-cooled to obtain an incomplete recrystallized structure; and then kept at 1060°C for 10-15 minutes ( The heating rate is 20-30°C / min), water cooling; repeat the process of the previous step once.

[0045] The corrosion-resistant Cr-Ni stainless steel plate obtained after optimization treatment was tested by EBSD, and its grain boundary ratio and reconstruction diagram are shown in Table 2 and Figure 5 shown. The proportion of the optimized special grain boundary is 79.6%, and it is distributed on the general high-angle grain boundary, which effectively in...

Embodiment 3

[0049] The 304 austenitic stainless steel plate aged at 650°C for 2 hours after solid solution was optimized. P, 0.0053S, 0.07Mo, the grain size is 20μm, and carbides are discontinuously precipitated along the grain boundaries.

[0050] In the first step, the alloy plate is subjected to cold rolling deformation with a reduction of 3%.

[0051] In the second step, the cold-rolled alloy plate is kept at 900°C for 70-80min (heating rate is 20-30°C / min), and water-cooled; then it is kept at 1050°C for 10-15min (heating rate is 20-30°C / min). min), water cooling; repeat the previous step process 3 times.

[0052] The corrosion-resistant Cr-Ni stainless steel plate obtained after optimization treatment was tested by EBSD, and its grain boundary ratio and reconstruction diagram are shown in Table 3 and Image 6 shown. The proportion of the optimized special grain boundary is 86.6%, and it is distributed on the general high-angle grain boundary, which effectively interrupts the netw...

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Abstract

The invention discloses a corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and a Cr-Ni type corrosion-resistant plate based on the same, belonging to the technical field of metallurgy. The optimizing treatment process comprises the steps of cold rolling and annealing, and is characterized in that after the plate is subjected to 3-5% of cold rolling, the deformed plate is subjected to multi-step annealing treatment. Common large-angle grain boundaries in the microscopic structure of the Cr-Ni type corrosion-resistant plate subjected to optimizing treatment have the preferable distribution characteristic on the {111} crystal face, and the proportion of the special grain boundaries is not lower than 75%; and the Cr-Ni type corrosion-resistant plate has favorable corrosion resistance. On the premise of optimizing the grain boundary characteristic distribution of the alloy, the invention shortens the annealing cycle, and certain induced common large-angle grain boundaries have the characteristic of low energy, thereby obviously enhancing the intergranular corrosion resistance of the alloy.

Description

technical field [0001] The corrosion resistance optimization treatment process of Cr-Ni type stainless steel and the corrosion resistance plate belong to the field of metallurgy technology, and are mainly used in the field of corrosion resistance optimization of austenitic stainless steel components such as nuclear power and petrochemical industry. Background technique [0002] Austenite is a solid solution in which carbon and (or) other elements are solid-dissolved in γ-iron, and the crystal structure is face-centered cubic. A corrosion phenomenon between the grains of stainless steel under the action of a corrosive medium is called intergranular corrosion. When the stainless steel with intergranular corrosion is subjected to stress, it will fracture along the grain boundary and its strength will almost completely disappear. This is one of the most dangerous forms of damage to stainless steel. One of the main factors causing the low intergranular corrosion resistance of au...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/44
Inventor 方晓英王卫国秦聪祥郭红刘志勇
Owner SHANDONG UNIV OF TECH
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