Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Reexamination Certificate
2004-06-16
2010-11-23
Wyszomierski, George (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
C148S218000
Reexamination Certificate
active
07837810
ABSTRACT:
Thermo-mechanical properties of welds in stainless steel is substantially improved by the implementation of a post weld heat treatment that illiminates sigma phase in the heat treated zone and favors niobium carbonitride precipitate formation in a desirable size range. In most cases, post weld heat treated material can be employed in pressurized devices at temperatures exceeding 550° C., which is currently regarded the upper safe temperature limit, and material according to the inventive subject matter was tested at temperature of up to 850° C. without reheat cracking.
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patent: 4418258 (1983-11-01), McNealy et al.
patent: 4814236 (1989-03-01), Qureshi et al.
patent: 6127643 (2000-10-01), Unde
patent: 55069218 (1980-05-01), None
Messer Barry
Oprea Vasile
Phillips Terrell T.
Fish & Associates PC
Fluor Technologies Corporation
Wyszomierski George
Zhu Weiping
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