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US 6,706,416 B1Granted
Process for manufacturing corrosion resistant composite metal products
OwnerAntonino Giorgio Cacaceinventor
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OwnerAntonino Giorgio Cacaceinventor
Estimating the term…
A method of producing a corrosion resistant ferrous product is disclosed. The product is produced by rolling a heated billet which comprises a mass of mild steel swarf in a stainless steel jacket. Two reducing agents are present in the jacket when the billet is heated. The first reducing agent is in the form of powdered aluminum, titanium turnings or other metal having a greater affinity for oxygen than chrome and which promotes the formation of CO rather than CO2 from air or oxygen which enters or evolves in the billet above about 800° C. The second reducing agent is in gaseous or vapour form substantially below that temperature. The second reducing agent may be provided by premixing with the swarf such substances as ammonium chloride or urea, which dissociate to form reducing gases when heated. Alternatively, the billet can be heated in a reducing furnace and the gas in the furnace may act as the second reducing agent.
A method of producing a corrosion resistant ferrous product in which a billet which comprises a mass of particulate material composed substantially of engineering steel in a stainless steel jacket is heated to a temperature at which the billet can be plastically worked, the method comprising the step of providing in the jacket a first reducing agent in the form of a metal having a greater affinity for oxygen than chrome and a second reducing agent which is present in gaseous or vapor form in the jacket at a temperature substantially below 800° C.
A method of producing a corrosion resistant ferrous product in which a billet which comprises a mass of particulate material composed substantially of engineering steel in a stainless steel jacket is heated to a temperature at which the billet can be plastically worked, the method comprising the step of providing in the jacket a first reducing agent selected from the group consisting of aluminum, titanium and zirconium and a substance selected from the group consisting of ammonium chloride, urea, iron bromide and ferric chloride.
A billet which comprises, in a stainless steel jacket, a mass of particulate material composed substantially of engineering steel, a first reducing agent in the form of a metal having a greater affinity for oxygen than chrome, and a second reducing agent in the form of a substance selected from the group consisting of ammonium chloride and urea.
Dependencies are inferred from the claim text.