AJAX furnace
The AJAX furnace was a modification of the tilting open hearth furnace that used blown oxygen to improve productivity. The process was used in the UK during the 1960s at a time of transition from open hearth to oxygen-based steelmaking.
History and description
[edit]The AJAX process invented in 1957, and named after its originator, Albert Jackson. The process involved modifying an open hearth furnace to use oxygen instead of air.[1] The use of oxygen in the open hearth negated the need for an external fuel source, as with Linz-Donawitz converters.[2]
The furnaces were used at the United Steel Companies at the Appleby-Frodingham steelworks near Scunthorpe, Lincolnshire, England as an alternative to installing completely new oxygen based steelmaking plant. In operational practice at Appleby-Frodingham the design initially increased productivity by 38%, as well as reducing scrap requirement from 3.5 to 0.2 long hundredweight (178 to 10 kg) per 1 long ton (1,000 kg). Later productivity increases were from 70% to 100%, with conversion costs reduced to 68%.[3] By 1962 five of the six open hearth furnaces at the plant had been converted.[1] Conversion time of the open hearths to the oxygen-based process was around 28 days on average, with a stated capital cost of £180,000 each.[4]
In 1966 the Appleby-Frodingham steelworks decided to replace the AJAX production with Linz-Donawitz (LD) converters.[3]
See also
[edit]References
[edit]- ^ a b "Giant continuous casting plant at Scunthorpe", New Scientist (305): 595, 20 Sep 1962
- ^ Garmonsway, Donald (20 July 1961), "A survey of oxygen steelmaking", New Scientist (244): 153–155
- ^ a b Heal, David W. (1974), "The Steel Industry in Post War Britain", Industrial Britain, David and Charles, pp. 92–5, 119–120
- ^ Allen, James Albert (1967), Studies in Innovation in the Steel and Chemical Industries, p. 206
Further reading
[edit]- Jackson, Albert (1969), Oxygen Steelmaking for steelmakers
- US patent 3169159, Albert Jackson, "Open-hearth furnace", issued 1965-Feb-9