Ferritic Stainless Steel for Use as Conduit Members for Emission of Automotive Exhaust Gas
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[0014]Such stainless steels as SUH409, SUS430J11 and SUS429 have been used as materials good of heat-resistance in an atmosphere to which conduit members are exposed. Some parts or members, which are heated up to 800-900° C. at highest, need high-temperature strength fairly higher than conventional steels. Such a part or member ordinarily has a complicated profile, so that it shall be made of a stainless steel good of formability and low-temperature toughness, which are never estimated from Mo-alloyed steel. Moreover, the part or member is likely to break down due to thermal fatigue, since thermal stress is repeatedly applied to the complicated profile.
[0015]The inventors have researched and examined effects of various alloying elements on properties of such a part or member, and discovered that a ferritic stainless steel is improved in all of high-temperature strength below 900° C., formability and low-temperature toughness by addition of both V and Cu to the same level of Nb, Mo-a...
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