Austenitic stainless steel

An austenitic and stainless steel technology, applied in lighting and heating equipment, heat exchange equipment, etc., can solve the problems of scale peeling, countermeasures have not been shown, etc., to achieve extended service life, excellent resistance to scale peeling, and prevent wear and tear Effect

Active Publication Date: 2008-06-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these gazettes, there is no recognition of scale peeling, which becomes a problem under the above-mentioned heating-cooling cycle, and its countermeasures have not yet been shown.

Method used

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  • Austenitic stainless steel
  • Austenitic stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment

[0112] The present invention will be described in more detail with reference to examples. However, the following examples are for the purpose of illustration and do not limit the present invention.

[0113] The steels with test numbers 1 to 36 (test numbers 1 to 32 are within the scope of the present invention, and 33 to 36 are outside the scope of the present invention) with the steel composition shown in Table 1 are smelted with a 10 kg vacuum induction heating furnace respectively. . The steel of test number 17 was deoxidized during refining under two different conditions because the number of inclusions was changed (17a, 17b)

[0114] [Table 1]

[0115] try

test

make up

No.

Chemical composition of steel (mass%) (the balance is Fe and impurities)

C

Si

mn

Cu

Cr

Ni

Al

N

P

S

...

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Abstract

Even after repeated high-temperature heating-cooling cycles, it still has excellent scale peeling resistance that can inhibit the peeling of protective oxide scales formed on the steel surface, and can be used in high temperature, especially high temperature humidified gas environments above 1023K. System stainless steel with the following steel composition: C: 0.01-0.15%, Si: 0.01-3%, Mn: 0.01-2%, Cu: 0.1-2.5%, Cr: 23-30%, Ni: 16-25% , Al: 0.005 to 0.20%, N: 0.001 to 0.40%, P: 0.04% or less, S: 0.01% or less, and one or more rare earth elements selected from the Y and Ln groups: total 0.005 to 0.1%, the balance is substantially composed of Fe and unavoidable impurities, and the inclusions containing Y and Ln group elements on the steel surface are 5×10-3 / μm2 or less.

Description

technical field [0001] The present invention relates to austenitic stainless steel, and more specifically to austenitic stainless steel excellent in scale peeling resistance in a high-temperature humidified gas environment. The austenitic stainless steel of the present invention is particularly suitable for applications subject to frequent repeated heating-cooling cycles in a high-temperature humidified gas environment, such as heat exchangers and reformers for distributed power sources. Background technique [0002] Microgas turbines and various fuel cells used as distributed generation generally have heat exchangers (regenerators) that use the heat of combustion exhaust gas to heat fuel air from the point of view of improving thermal efficiency. ) cogeneration system. The heat exchanger is composed of stainless steel corrugated fins, metal plates, and the like. Among the stainless steels used, high heat resistance and good weldability and workability are desired. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58
CPCC22C38/42C22C38/005C22C38/001F28F21/083Y02E60/50C22C38/40
Inventor 西山佳孝大塚伸夫
Owner NIPPON STEEL CORP
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