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Ferritic stainless steel having excellent ductility and method for manufacturing same

Inactive Publication Date: 2017-10-05
POSCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The ferritic stainless steel described in this patent has a high degree of ductility, meaning it can be easily bent and shaped without breaking. This makes it useful in a variety of applications where flexibility and durability are important.

Problems solved by technology

However, ferrite stainless steels have poor ductility and thus it is difficult to use ferritic stainless steels instead of austenitic stainless steels in many applications.
However, meaningful results have not yet been reported.

Method used

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  • Ferritic stainless steel having excellent ductility and method for manufacturing same
  • Ferritic stainless steel having excellent ductility and method for manufacturing same

Examples

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Embodiment Construction

[0062]Molten steels having the compositions shown in Table 1 were prepared and were cast at a constant speed under the conditions shown in Table 2 in order to produce slabs. The slabs were subjected to a hot rolling process and a hot band annealing process to obtain hot-rolled sheets. In Table 1, the contents of elements are given in wt %, and in Table 2, the slab cooling rate is an average cooling rate measured based on the surface temperature of a slab within the temperature range of 1100° C. to 1200° C.

TABLE 1SteelCSiMnPSCrTiAlNA0.0120.250.160.0310.00311.00.150.0400.012B0.0150.350.80.0250.00212.00.210.0320.015

TABLE 2Slab Cooling RateHot BandHot Band(° C. / sec) within theAnnealingAnnealingTemperature Range ofTemperatureTimeSteel1100° C. to 1200° C.(° C.)(min)NotesA260030InventiveExample 1A280015InventiveExample 2A680015ComparativeExample 1B190015InventiveExample 3B690015ComparativeExample 2

[0063]Thereafter, the hot-rolled sheets were photographed using a transmission electron micro...

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Abstract

Ferritic stainless steel having a high degree of ductility and a method for manufacturing the ferritic stainless steel are provided. The stainless steel includes, by wt %, C: 0.005% to 0.1%, Si: 0.01% to 2.0%, Mn: 0.01% to 1.5%, P: 0.05% or less, S: 0.005% or less, Cr: 10% to 30%, Ti: 0.005% to 0.5%, Al: 0.01% to 0.15%, N: 0.005% to 0.03%, and the balance of Fe and inevitable impurities, wherein the ferritic stainless steel includes 3.5×106 or fewer particles of an independent Ti(CN) precipitate per square millimeter (mm2) of ferrite matrix.

Description

TECHNICAL FIELD[0001]The present disclosure relates to ferritic stainless steel having a high degree of ductility and a method for manufacturing the ferritic stainless steel, and more particularly, to a new kind of ferritic stainless steel provided by improving ferritic stainless steel having poor ductility compared to austenitic stainless steel for use in applications requiring high ductility, and a method for manufacturing the ferritic stainless steel.BACKGROUND ART[0002]Ferritic stainless steels have a high degree of corrosion resistance even though the contents of expensive alloying elements in the ferritic stainless steels are low. That is, ferritic stainless steels are more competitive in price than austenitic stainless steels. Ferritic stainless steels are used in applications such as construction materials, transportation vehicles, or kitchen utensils. However, ferrite stainless steels have poor ductility and thus it is difficult to use ferritic stainless steels instead of a...

Claims

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Application Information

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IPC IPC(8): C21D9/00C22C38/06C22C38/04C21D6/00C22C38/00B22D27/04C21D8/02C22C38/28C22C38/02
CPCC21D9/0081C21D2211/005C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001B22D27/04C21D8/0205C21D8/021C21D8/0226C21D8/0263C21D6/008C21D6/005C21D6/002C22C38/28C22C38/00C21D2211/004B22D11/002
Inventor PARK, SOO-HOSHIM, JAE-HONG
Owner POSCO
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