Method of producing powdered steel products

Claim 1

A METHOD OF MAKING A HEAT-TREATABLE ARTICLE OF STAINLESS STEEL WHICH COMPRISES COMPACTING A MIXTURE OF BETWEEN 11 AND 25% OF A POWDERED FORM OF CHROMIUM AND UP TO 2.5% OF A POWDERED FORM OF NICKEL, AND BALANCE LOW CARBON, DEOXIDIZED, HIGHTLY-COMPRESSIBLE IRON POWDER AT A PRESSURE ABOVE 50 TONS PER SQUARE INCH, SINTERING THE RESULTING COMPACT AT A TEMPERATURE ABOVE 2000*F. IN A HYDROGEN ATMOSPHERE HAVING A DEW POINT BELOW -25* F. TO DECREASE THE CARBON CONTENT OF THE COMPAFT TO BELOW 0.1%, COINING THE RESULTING SINTERED COMPACT AT A PRESSURE ABOVE 60 TONS PER SQUARE INCH, AND CARBURIZING SAID SINTERED AND CINED COMPACT AT A TEMPERATURE ABOVE 2000* F. IN A HYDROGEN ATMOSPHERE HAVING A DEW POINT BELOW -15*F. AND IN THE PRESENCE OF, BUT OUT OF CONTACT WITH, SOLID CARBON UNTIL SAID COMPACT CONTAINS CARBON IN THE RANGE OF 0.08 TO 1.0%.

Claim 2

A METHOD OF MAKING A HEAT-TREATABLE ARTICLE OF STAINLESS STEEL WHICH COMPRISES COMPACTING A MIXTURE OF BETWEEN 11 AND 25% OF A POWDERED FORM OF CHROMIUM AND UP TO 2.5% OF A POWDERED FORM OF NICKEL, AND BALANCE LOW CARBON, DEOXIDIZED, HIGHTLY-COMPRESSIBLE IRON POWDER AT A PRESSURE ABOVE 50 TONS PER SQUARE INCH, SINTERING THE RESULTING COMPACT AT A TEMPERATURE ABOVE 2000*F. IN A HYDROGEN ATMOSPHERE HAVING A DEW POINT BELOW -25* F. TO DECREASE THE CARBON CONTENT OF THE COMPAFT TO BELOW 0.1%, COINING THE RESULTING SINTERED COMPACT AT A PRESSURE ABOVE 60 TONS PER SQUARE INCH, AND CARBURIZING SAID SINTERED AND CINED COMPACT AT A TEMPERATURE ABOVE 2000* F. IN A HYDROGEN ATMOSPHERE HAVING A DEW POINT BELOW -15*F. AND IN THE PRESENCE OF, BUT OUT OF CONTACT WITH, SOLID CARBON UNTIL SAID COMPACT CONTAINS CARBON IN THE RANGE OF 0.08 TO 1.0%.