Ferritic steel alloy with improved high temperature properties

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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148 12EA, 148 36, 148 37, C22C 3806, C22C 3826, C22C 3828

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042617391

ABSTRACT:
A ferritic steel having improved creep or sag resistance and oxidation resistance at temperatures ranging from about 732.degree. to 1093.degree. C. after a final anneal at 1010.degree. to 1120.degree. C., together with good weldability, the steel consisting essentially of, by weight percent, from about 0.01% to 0.06% carbon, about 1% maximum manganese, about 2% maximum silicon, about 1% to about 20% chromium, about 0.5% maximum nickel, about 0.5% to 2% aluminum, about 0.1% to 0.05% nitrogen, 1.0% maximum titanium, with a minimum titanium content of 4 times the percent carbon plus 3.5 times the percent nitrogen, about 0.1% to 1.0% columbium, with the sum total of titanium plus columbium not exceeding about 1.2%, and remainder essentially iron. In the form of cold reduced strip and sheet stock the steel has particular utility in motor vehicle components.

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