| 摘要 |
<p>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.</p> |
