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Ferritic stainless steel with excellent wrinkling characteristics and surface quality and method for producing the same

A technology of stainless steel and ferrite, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., to achieve the effect of excellent wrinkling characteristics, high r value, and excellent surface gloss

Active Publication Date: 2021-06-29
POSCO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there have been few attempts to improve the texture by symmetrical rolling or asymmetrical rolling of hot-rolled steel sheets coiled at high temperature before annealing, followed by continuous annealing

Method used

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  • Ferritic stainless steel with excellent wrinkling characteristics and surface quality and method for producing the same
  • Ferritic stainless steel with excellent wrinkling characteristics and surface quality and method for producing the same
  • Ferritic stainless steel with excellent wrinkling characteristics and surface quality and method for producing the same

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Embodiment approach

[0039] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. These embodiments are provided to fully convey the concept of the disclosure to those of ordinary skill in the art. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. In the drawings, in order to clearly describe the present disclosure, parts irrelevant to the description are omitted, and the size of elements may be exaggerated for clarity.

[0040] The ferritic stainless steel having excellent wrinkling characteristics and excellent surface quality according to an embodiment of the present disclosure contains 0.005% to 0.1% of carbon (C), 0.01% to 2.0% of silicon (Si ), 0.01% to 1.5% manganese (Mn), 0.05% or less phosphorus (P), 0.005% or less sulfur (S), 10% to 30% chromium (Cr), 0.005% to 0.1 % nitrogen (N), 0.005% to 0.2% aluminum (Al), the re...

Embodiment

[0083] Molten steel having the composition shown in Table 1 was continuously cast to prepare slabs, and the slabs were hot rolled by reheating. Then, the hot-rolled steel sheet with an initial thickness of 3 mm to 7 mm is cold-rolled once before thermal annealing.

[0084] Table 1

[0085]

[0086] The primary cold rolling is performed at a reduction ratio of 20% to 50% using conventional cold rolling or asymmetric cold rolling. After thermal annealing and pickling of the primary cold-rolled steel sheets, secondary cold rolling was performed at a reduction ratio of 50% to 85%, followed by cold annealing and pickling to prepare samples.

[0087] The samples were processed and subjected to a 15% tensile test in directions of 0°, 45° and 90° with respect to the rolling direction to measure the r value (Lankford value). From the r values ​​measured in all directions (r 0 、r 45 and r 90 ) to calculate the r-bar value (r-bar=(r 0 + r 90 +2*r 45 ) / 4). In addition, the wri...

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Abstract

Disclosed are ferritic stainless steels having excellent wrinkling characteristics and surface of the final product by further performing cold rolling before hot rolling annealing heat treatment to change the microstructure of the central part of the cross section, and a method for producing the same quality. The ferritic stainless steel according to the present invention comprises in weight %: 0.005% to 0.1% of C; 0.01% to 2.0% of Si; 0.01% to 1.5% of Mn; 0.05% or less of P; 0.005% or more less S; 10% to 30% Cr; 0.005% to 0.1% N; 0.005% to 0.2% Al; and the balance is Fe and other unavoidable impurities, where γ max 20% or more and less than 50%, and the fine groove area ratio of the surface is 2.0% or less.

Description

technical field [0001] Embodiments of the present disclosure relate to a ferritic stainless steel having excellent ridging characteristics and excellent surface quality and a method of manufacturing the same, and more specifically, to A ferritic stainless steel having excellent wrinkling properties and excellent surface quality by improving the structure in the center of the thickness by rolling, and a manufacturing method thereof. Background technique [0002] Generally, stainless steels are classified according to composition or metal structure. According to the metal structure, stainless steel is divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel and duplex stainless steel. Among these stainless steels, ferritic stainless steel, which is excellent in corrosion resistance despite having a small amount of expensive alloying elements, has been widely used in various kitchen utensils, automobile exhaust system parts, building mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/00C22C38/02C21D8/02C21D9/46
CPCC21D8/0405C21D8/0426C21D8/0436C21D8/0473C21D9/48C22C38/00C22C38/004C22C38/02C22C38/04C22C38/06C22C38/18C21D2211/005C21D6/002C22C38/40C22C38/001C21D8/0226C21D8/0236C21D9/46C21D8/0263C21D8/0268C21D8/0273C21D9/0081
Inventor 朴秀湖李凯蔓
Owner POSCO CO LTD
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