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Ferrite-based stainless steel having excellent impact toughness, and method for producing same

An impact toughness, stainless steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of deterioration of impact characteristics, increased brittleness, insufficient rolling reduction, etc., to achieve the effect of excellent impact toughness

Pending Publication Date: 2020-07-31
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

[0005] In addition, during hot rolling, it is difficult to obtain fine grains due to insufficient rolling reduction, and brittleness is further increased due to the formation of coarse grains and uneven grains, and impact characteristics are deteriorated

Method used

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  • Ferrite-based stainless steel having excellent impact toughness, and method for producing same
  • Ferrite-based stainless steel having excellent impact toughness, and method for producing same
  • Ferrite-based stainless steel having excellent impact toughness, and method for producing same

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Embodiment approach

[0032] 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 implemented in another form. In the drawings, parts irrelevant to the description may not be shown to clarify the present disclosure, and also, for easy understanding, the size of components is more or less exaggerated.

[0033] Furthermore, when a part "comprises" or "includes" an element, the part may also include other elements, and other elements are not excluded, unless specifically described to the contrary.

[0034] Expressions used in the singular include plural expressions unless there are clearly different meanings in the context.

[0035] Various methods have been investigated to improve the toughness of ferritic stainless s...

Embodiment

[0084] A slab having the composition shown in Table 1 was heated to 1200°C, and then hot-rolled to a thickness of 10.0mm by setting the total reduction ratio at the rear of the rough rolling to 55%, so that the finish rolling finish temperature was 940°C . At this time, the mass flow temperature of the rough-rolled bar before finish rolling was set to about 1000°C.

[0085] 11Cr-0.2Ti ferrite was prepared by non-annealing (A), 930℃ hot rolling annealing (B: B-1, B-2) and 1020℃ hot rolling annealing (C) on 10.0mm thick hot rolled steel plate Body stainless steel plate. 930° C. hot-rolled and annealed steel sheets, which are the range of examples of the present disclosure, were produced in two types, B-1 and B-2, to determine reproducibility.

[0086] [Table 1]

[0087]

[0088] 1. Microstructure

[0089] figure 1 is a photograph showing the microstructure of a hot-rolled annealed steel sheet at annealing temperatures according to embodiments of the present disclosure.

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Abstract

Disclosed are a hot rolled annealed ferrite-based stainless steel sheet having excellent impact properties and a thickness of at least 6 mm, and a method for producing same. A ferrite-based stainlesssteel having excellent impact toughness according to an embodiment of the present invention includes, by wt%, more than 0% and at most 0.01% of C, at most 0.8% of Si, at most 0.5% of Mn, 10-14% of Cr,0.01-0.45% of Ti, and more than 0% and at most 0.015% of N, with the remainder comprising Fe and inevitable impurities, and the average misorientation between grains in the microstructure is 0.6 to 1.1 degrees.

Description

technical field [0001] The present disclosure relates to a ferritic stainless steel having excellent impact toughness and a manufacturing method thereof, and more particularly, to a ferritic stainless hot-rolled annealed steel sheet having a thickness of 6 mm or more containing Ti and having excellent impact properties and manufacturing thereof method. Background technique [0002] Ferritic stainless steel has poor workability, impact toughness, and high-temperature strength compared with austenitic stainless steel, but since it does not contain a large amount of Ni, it is cheap and has low thermal expansion. In recent years, it is preferably used as an automotive exhaust system component material. In particular, flanges for exhaust systems have recently been converted to ferritic stainless steel thick plates with improved corrosion resistance and durability due to microcracks and exhaust gas leakage problems. [0003] STS409L material is a steel grade that prevents weld s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/00C22C38/20C22C38/50C21D8/02C21D9/46
CPCC21D8/02C21D9/46C22C38/00C22C38/20C22C38/28C22C38/02C22C38/04C22C38/001C22C38/06C22C38/004C21D8/0205C21D8/0226C21D8/0263C21D6/002C21D6/00C22C38/50C21D2201/05C21D2211/005C21D6/004C21D6/005C21D6/008C22C38/42
Inventor 孔正贤
Owner 浦项股份有限公司