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Low-cr ferritic stainless steel with excellent formability and high temperature properties, and manufacturing method therefor

A technology of high-temperature characteristics and manufacturing methods, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of poor high-temperature strength and high-temperature oxidation resistance, and rising manufacturing costs, and achieve excellent high-temperature strength characteristics, prevent formability, improve Effect of High Temperature Oxidation Resistance

Pending Publication Date: 2021-07-23
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] However, the high-temperature strength and high-temperature oxidation resistance are inferior to those of high-Cr and Nb-added steel, so there is a limit to the expansion of applications
Increasing Cr content or adding Nb to improve high-temperature strength and high-temperature oxidation resistance causes an increase in manufacturing costs

Method used

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  • Low-cr ferritic stainless steel with excellent formability and high temperature properties, and manufacturing method therefor
  • Low-cr ferritic stainless steel with excellent formability and high temperature properties, and manufacturing method therefor

Examples

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Embodiment approach

[0034] 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 other forms. In the drawings, in order to clearly explain the present disclosure, parts irrelevant to the description may not be shown, and furthermore, the size of components is more or less exaggerated for easy understanding.

[0035] Furthermore, when a part "includes" or "includes" an element, unless there is a description specifically to the contrary, the part may also include other elements, and other elements are not excluded.

[0036] Expressions used in the singular include plural expressions unless there are clearly different meanings in the context.

[0037] As a result of conducting various studies to improve hi...

Embodiment

[0081] Using stainless steel laboratory scale melting and ingot production equipment, 20 mm bar samples were prepared with the alloy composition system shown in Table 1 below. After reheating at 1200°C and hot rolling to 6 mm, hot rolling annealing was performed at 1100°C. And after cold rolling to 2.0 mm, annealing heat treatment was performed at 1100°C. For some inventive examples only, cold-rolled and annealed steel sheets were produced by rapid cooling to 500° C., holding for 7 minutes, and air cooling after heat treatment. The remaining inventive examples and comparative examples were subjected to air cooling after the annealing heat treatment.

[0082]

[0083] distinguish C N Si mn Cr Ti Cu Al sn Comparative example 1 0.005 0.010 0.41 0.21 11.4 0.21 0.05 0.02 0 Comparative example 2 0.006 0.008 0.6 0.21 12.1 0.19 0.15 0.02 0.05 Comparative example 3 0.007 0.007 0.2 0.21 11.1 0.18 0.24 0.03 0.06 Co...

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Abstract

Disclosed are low-Cr ferritic stainless steel with excellent formability and high temperature properties, and a manufacturing method therefor. Embodiments of the present invention may provide: low-Cr ferritic stainless steel, which has excellent high temperature strength and high temperature oxidation resistance and secures formability, corresponding to high Cr ferritic stainless steel without an increase in the Cr amount or an addition of Nb, by optimizing the amounts of Ci, Si, and Sn and utilizing solid solution strengthening and precipitation strengthening; and a manufacturing method therefor.

Description

technical field [0001] The present disclosure relates to a low-Cr ferritic stainless steel, and more particularly, to a low-Cr ferritic stainless steel capable of securing formability while having excellent high-temperature strength and high-temperature oxidation resistance, and a method of manufacturing the same. Background technique [0002] Ferritic stainless steel has excellent corrosion resistance while adding cheaper alloying elements, and has high price competitiveness compared with austenitic stainless steel. In particular, low-Cr ferritic stainless steels of 9% to 14% are superior in cost competitiveness and are used for exhaust system components (mufflers, exhaust manifolds, collector cone, etc.). [0003] However, high-temperature strength and high-temperature oxidation resistance are inferior to those of high-Cr and Nb-added steel, so there is a limit to the expansion of uses. Increasing the Cr content or adding Nb to improve high-temperature strength and high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/20C22C38/28C22C38/06C22C38/02C22C38/04C22C38/00C21D9/46C21D6/00
CPCC22C38/20C22C38/04C22C38/02C21D9/46C22C38/28C22C38/004C22C38/008C21D1/19C21D8/0247C21D2211/005C21D2211/004C21D6/002C21D8/0236C21D8/0205C21D8/0273C21D6/02C21D1/18C22C38/001C22C38/06C22C38/00C21D6/005C21D6/008
Inventor 郑壹酂林珍佑柳汉振
Owner 浦项股份有限公司
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