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Ferritic stainless steel sheet for egr coolers

A technology of EGR cooler and stainless steel plate, which is applied in the direction of adding non-fuel substances to the charging system, machine/engine, fuel, etc., can solve the problems of formability and other problems, and achieve the effect of excellent brazeability

Inactive Publication Date: 2011-07-20
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the viewpoint of acid resistance, a large amount of Cu and Si are required, so it becomes hard, and when used as a steel plate, there is a problem with formability

Method used

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  • Ferritic stainless steel sheet for egr coolers
  • Ferritic stainless steel sheet for egr coolers
  • Ferritic stainless steel sheet for egr coolers

Examples

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Embodiment Construction

[0061] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0062] For the EGR cooler, brazability due to Ni or Cu is required. Therefore, the inventors of the present invention have earnestly studied the influence of alloy elements on brazeability. As a result, it was found that, as shown in the following formulas (1) and (2), in ferritic stainless steel sheets, Ti, which is often added for the purpose of improving workability or intergranular corrosion resistance, and Ti for the purpose of deoxidation On the other hand, Al to be added has an upper limit that can ensure good brazeability.

[0063] Ti-3N≤0.03 (1)

[0064] 10(Ti-3N)+Al≤0.5 (2)

[0065] To obtain good brazing properties, the molten solder needs to be wetted and spread on the surface of the stainless steel plate, but the surface film formed on the stainless steel plate under the brazing atmosphere affects the wettability. In addition, in the brazing a...

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Abstract

Disclosed is a ferritic stainless steel sheet for EGR coolers, which is characterized by containing at least, in mass%, not more than 0.03% of C, not more than 0.05% of N, not less than 0.1% but not more than 1% of Si, not less than 0.02% but not more than 2% of Mn, not less than 0.2% but not more than 1.5% of Cu, not less than 15% but not more than 25% of Cr, not less than 8(C + N)% but not more than 1% of Nb, and not more than 0.5% of Al, with the balance made up of Fe and unavoidable impurities. The ferritic stainless steel sheet is also characterized in that Ti is further contained therein in an amount satisfying formulae (1) and (2) in mass%, and that the amounts of Cr and Cu are within the ranges satisfying formula (3), wherein (1) Ti - 3N is not more than 0.03; (2) 10(Ti - 3N) + Al is not more than 0.5; (3) Cr + 2.3Cu is not less than 18.

Description

technical field [0001] The present invention relates to an exhaust gas recirculation (also called exhaust gas recirculation, Exhaust Gas Recirculation: hereinafter referred to as EGR) system used in, for example, a diesel engine or a gasoline engine of an automobile, and is suitable for passing engine cooling water or air, etc. Ferritic stainless steel plate for the EGR cooler that cools the exhaust gas. Background technique [0002] In recent years, in the field of automobiles, efforts have been made to suppress carbon dioxide gas emissions while further strengthening exhaust regulations due to increased awareness of environmental issues. In addition, in addition to efforts from fuels called bioethanol or biodiesel fuel, improvements in fuel consumption are being made by reducing weight or installing heat exchangers for heat recovery of exhaust heat, or implementing EGR, DPF (Diesel Particulate Filter) and urea SCR (Selective Catalytic Reduction: Selective Catalytic Reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/58F02M25/07
CPCF02M25/0701F02M25/0714C22C38/02F02M25/0734C22C38/26F28F21/089C22C38/04Y02T10/121F28F19/06C22C38/20C22C38/001F28F21/083F02M26/11F02M26/29F02M26/50C22C38/38C22C38/58
Inventor 平出信彦高桥明彦前田滋
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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