Ferritic stainless steel excellent in corrosion resistance to exhaust condensate and brazing properties and method for producing the same
A corrosive and brazable technology, which is applied in the field of ferritic stainless steel and its manufacturing, can solve the problems that the exhaust condensate corrosion resistance and brazability cannot be satisfied at the same time, and achieve excellent corrosion resistance of exhaust condensate and the effect of brazeability
Active Publication Date: 2019-03-01
NIPPON STEEL STAINLESS STEEL CORP
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Problems solved by technology
[0018] However, the inventions disclosed in Patent Document 1 to Patent Document 5 cannot satisfy both the corrosion resistance and brazing performance against exhaust condensed water.
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[0129] The present invention will be described in more detail based on examples.
[0130] Steels having the compositions shown in Table 3A and Table 3B were melted, hot-rolled to a plate thickness of 4 mm, annealed at 1050° C. for 1 minute, and then pickled. Thereafter, cold rolling was performed until the sheet thickness became 1 mm. In particular, the roll roughness, reduction ratio, and cold rolling speed of the final pass of cold rolling were respectively performed under the conditions shown in Table 3C. The annealing of the cold-rolled sheet was performed by controlling the residence time at 650°C to 950°C and the residence time at 950°C to 1050°C, respectively, as shown in Table 3C.
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The present invention relates to a ferritic stainless steel, which contains C: 0.001-0.030%, Si: 0.01-1.00%, Mn: 0.01-2.00%, P: 0.050% or less, S: 0.0100% or less, in mass %, Cr: 11.0 to 30.0%, Mo: 0.01 to 3.00%, Ti: 0.001 to 0.050%, Al: 0.001 to 0.030%, Nb: 0.010 to 1.000%, and N: 0.050% or less, and the remainder includes Fe and unavoidable impurities , and the amount (mass%) of Al, Ti and Si satisfies Al / Ti≥8.4Si-0.78.
Description
technical field [0001] The present invention relates to a ferritic stainless steel used in an exhaust condensate environment and a manufacturing method thereof. Exhaust gas recirculation devices such as automobile mufflers, exhaust heat recovery devices, and EGR (Exhaust Gas Recirculation: Exhaust Gas Recirculation) coolers are examples of components exposed to the environment of exhaust gas condensate. [0002] This application claims priority based on Japanese Patent Application No. 2014-222201 filed on October 31, 2014 and Japanese Patent Application No. 2015-210741 filed on October 27, 2015, the contents of which are incorporated herein. Background technique [0003] In recent years, in the field of automobiles, since various components contained in exhaust gas cause air pollution and environmental pollution, regulations have been strengthened. Therefore, taking the car's CO 2 For the purpose of reducing emissions and improving fuel consumption, not only high-efficienc...
Claims
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IPC IPC(8): C22C38/00C21D9/46C22C38/38C22C38/60
CPCC21D6/002C22C38/004C22C38/005C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C21D9/46C21D8/0205C21D8/0236C21D8/0273C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C21D1/74C21D8/0221C21D8/0247C22C38/38C22C38/60C21D2211/005C22C38/00C22C38/20C22C38/32C22C38/001C22C38/002C22C38/46C22C38/52C22C38/54
Inventor 安部雅俊滨田纯一平出信彦神野宪博福元成雄金子农林笃刚
Owner NIPPON STEEL STAINLESS STEEL CORP