A high temperature oxidation resistant austenitic stainless steel

A technology for oxidizing austenite and stainless steel, applied in the field of metallurgy, can solve problems such as high Ni content, complex alloy composition system, increased manufacturing cost and production difficulty, and achieve the effect of improving high temperature oxidation resistance

Active Publication Date: 2022-01-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy composition system is complex, the Ni content is relatively high, and precious metal elements such as W are added, which increases the manufacturing cost and production difficulty
Moreover, the austenitic heat-resistant stainless steel applied for in this patent is only suitable for ultra-supercritical coal-fired boilers, and its purpose is to obtain good resistance to high-temperature oxidation and high creep performance, but its maximum service temperature can only reach about 700°C , not suitable for long-term service in a high temperature environment above 900°C

Method used

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  • A high temperature oxidation resistant austenitic stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition of the high-temperature oxidation-resistant austenitic stainless steel of this embodiment is shown in Table 1.

[0039] The preparation method of the high-temperature oxidation-resistant austenitic stainless steel of the present embodiment is as follows:

[0040] The heating temperature of the ingot billet is 1230°C, the final rolling temperature is 900°C, and the finished plate size is 5×1500×4000mm. The solution heat treatment process is selected as 1050°C-10min.

[0041] After the obtained hot-rolled plate has been served at 900°C for 300 hours, the oxidation weight gain is 2.81×10 -6 g / mm 2 .

Embodiment 2

[0043] The composition of the high-temperature oxidation-resistant austenitic stainless steel of this embodiment is shown in Table 1.

[0044] The preparation method of the high-temperature oxidation-resistant austenitic stainless steel of the present embodiment is as follows:

[0045] The heating temperature of the ingot billet is 1240°C, the final rolling temperature is 910°C, and the finished sheet size is 8×1600×4500mm. The solution heat treatment process is selected as 1050°C-16min.

[0046] After the obtained hot-rolled plate has been served at 900°C for 300 hours, the oxidation weight gain is 2.78×10 -6 g / mm 2 .

Embodiment 3

[0048] The composition of the high-temperature oxidation-resistant austenitic stainless steel of this embodiment is shown in Table 1.

[0049] The preparation method of the high-temperature oxidation-resistant austenitic stainless steel of the present embodiment is as follows:

[0050] The heating temperature of the ingot billet is 1250°C, the final rolling temperature is 910°C, and the finished sheet size is 12×1600×4500mm. The solution heat treatment process is selected as 1050°C-24min.

[0051] The room temperature tensile strength of the obtained hot-rolled plate was 654 MPa, and the room temperature yield strength was 261 MPa. The obtained hot-rolled sheet has an oxidation weight gain of 2.73×10 after serving at 900°C for 300 hours -6 g / mm 2 .

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Abstract

The invention provides a high-temperature oxidation-resistant austenitic stainless steel, which is characterized in that, in terms of weight percentage, it comprises: C≤0.080%, Si≤1.50%, Mn≤2.00%, P≤0.045%, S≤0.030%, Ni 19.00-22.00%, Cr 24.00-26.00%, B 0.20-0.40%, N≤0.03%, and the balance is Fe and unavoidable impurities. The high-temperature oxidation resistance of the austenitic stainless steel of the invention is improved, and it can serve for a long time in a high-temperature environment, and the service time is at least 2-3 times that of the current common austenitic stainless steel.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a high-temperature oxidation-resistant austenitic stainless steel. Background technique [0002] High-temperature oxidation brings a lot of harm, and the oxide skin is formed on the surface, which causes the size of the used parts to change and affects the function of use. When the scale is broken, the metal matrix is ​​further oxidized. In some areas, due to the difference in the distribution of alloying elements, the oxidation is severe, causing stress concentration and stress fatigue of the used parts. At high temperatures, the scale will evaporate, which greatly aggravates the damage and scrap of parts. [0003] The Chinese invention patent application with the application number 201310727913.9 discloses a high-temperature oxidation-resistant austenitic heat-resistant stainless steel. The mass percentage of its chemical composition is: C<0.02%, Si 2.0-2.5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/54
CPCC22C38/02C22C38/04C22C38/58C22C38/54C22C38/001C21D2211/001
Inventor 曾莉张威郭宏钢王岩
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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