Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1989-04-20
1990-12-04
Yee, Deborah
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
148 4, 148 13, 148901, 148329, 148318, 21912166, 156664, 204140, 75 1042, C23C 2200, C23C 826, C23C 3304, C23F 404
Patent
active
049753355
ABSTRACT:
This application is a continuation-in-part of application Ser. No. 07/218695, filed Aug. 8, 1988. This invention describes a series of Fe-Mn-Al-C based corrosion resistance alloys. It also describes how to obtain such alloys which has comparable good corrosion resistance in many environments to conventional stainless steel as 304 and 430. The correlation of chemical compositions among the manganese, aluminum, carbon and other minor elements ae discussed. Therefore they are made to be practical and more definitive. According to more advanced understanding in overall of the Fe-Mn-Al-C based alloys that are included in this invention have to be surface treated and/or pickled, passivated by the methods included in this invention. After the surface treatments, the final products will have an obviously comparable depleted manganese and/or higher chromium on the alloy surface and will have better corrosion resistance than the conventional Fe-Mn-Al-C and Fe-Mn-Al-C-Cr based alloys.
In addition, the manufacture and fabrication processes for the present designed Fe-Mn-Al-C based alloys also include the meltings, mixings, ingot castings, hot workings, cold workings, heat treatments and surface treatments.
REFERENCES:
patent: 4157923 (1979-06-01), Yen et al.
Fancy Steel Corporation
Yee Deborah
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