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Ferrite-based stainless steel having excellent processability and high-temperature strength and method for manufacturing same

A high-temperature strength and ferrite technology, applied in the field of ferritic stainless steel, can solve the problems of insufficient understanding of the influence of high-temperature characteristics

Active Publication Date: 2021-04-30
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although many studies have been conducted on the influence of alloys such as Mo, Nb, etc. as elements improving high-temperature characteristics, in practice, the understanding of the influence of crystal grains and precipitates that appear inside materials at high temperatures on high-temperature characteristics is insufficient

Method used

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  • Ferrite-based stainless steel having excellent processability and high-temperature strength and method for manufacturing same
  • Ferrite-based stainless steel having excellent processability and high-temperature strength and method for manufacturing same
  • Ferrite-based stainless steel having excellent processability and high-temperature strength and method for manufacturing same

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Embodiment approach

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided to convey the technical idea of ​​the present disclosure to those of ordinary skill in the art. However, the present disclosure is not limited to these embodiments, and may be embodied in another form. In the drawings, in order to clarify the present disclosure, parts irrelevant to the description may not be shown, and in addition, the size of components is shown more or less exaggerated for easy understanding.

[0025] Furthermore, when a part "includes" or "includes" an element, unless there is a specific description to the contrary, the part may also include other elements without excluding other elements.

[0026] Expressions used in the singular include expressions in the plural unless there are clearly different meanings in the context.

[0027] In order to ensure high temperature strength for ensuring...

Embodiment

[0064] 20mm bar samples were prepared with the alloy compositions shown in Table 1 below using laboratory scale fusion stainless steel and ingot production equipment. After hot rolling to 6 mm according to reheating temperature, reduction ratio, holding time according to formula (1), and coiling temperature as shown in Table 2, hot rolling annealing was performed at 1,100° C., and after cold rolling to 2.0 After mm, annealing is performed at 1,100°C to produce the final product.

[0065] [Table 1]

[0066] steel type C N Si mn P Cr Mo Nb W distinguish A 0.0088 0.0114 0.3 0.4 0.02 18 1.1

0.52 1.2 comparative example B 0.0104 0.0083 0.2 0.5 0.03 17.8 2.0 0.65 0.3

comparative example C 0.0089 0.0091 0.3 0.4 0.02 18.4 1.9 0.21

0.4

comparative example D 0.0123 0.0102 0.4 0.3 0.03 18.6 25 0.14

0.3

comparative example E 0.0092 0.0090 0.2 0.4 0.02 22.4 1.7 0.53 1.7...

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Abstract

Disclosed are an ferrite-based stainless steel having improved processability and high-temperature strength through component system composition and control of precipitate distribution and a method for manufacturing same. The ferrite-based stainless steel having excellent processability and high-temperature strength, according to an embodiment of the present invention, comprises: 0.0005 to 0.02 wt% of C; 0.005 to 0.02 wt% of N; 0.01 to 1.0 wt% of Si; 0.01 to 1.2 wt% of Mn; 0.001 to 0.05 wt% of P; 10.0 to 25.0 wt% of Cr; 1.5 to 3.0 wt% of Mo; 0.3 to 0.7 wt% of Nb; 0.5 to 2.0 wt% of W; the balance of Fe; and inevitable impurities, wherein the number of precipitates having an averaged diameter of 0.5 [mu]m or less is 105 / mm<2> or less.

Description

technical field [0001] The present disclosure relates to ferritic stainless steel having excellent workability and high temperature strength, and more particularly, to ferritic stainless steel capable of improving workability and high temperature strength through control of component composition and precipitate distribution and methods of manufacture thereof. Background technique [0002] Ferritic stainless steel is a steel with high price competitiveness compared with austenitic stainless steel because ferritic stainless steel has excellent corrosion resistance even if a small amount of noble alloy elements are added. Ferritic stainless steel is used for exhaust system parts (exhaust-manifold, collector cone) having an exhaust gas temperature of 800° C. or higher. The exhaust manifold of the automobile exhaust system is directly exposed to high-temperature exhaust gas of 800°C or higher, and requires very high safety in a long-term operating environment. For this reason, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/26C22C38/02C22C38/04C22C38/00C21D8/02
CPCC22C38/22C22C38/00C22C38/04C22C38/26C22C38/02C21D8/02C21D8/0205C22C38/44C21D8/0226C22C38/002C22C38/48C22C38/001C21D6/005C21D6/004C21D9/46C21D6/008Y02P10/20C21D2211/005
Inventor 朴志彦郑壹酂朴美男
Owner 浦项股份有限公司