Improvements in the Manufacture of Crucible Steel.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Crucible Steel.
I, SEBASTIAN DANNER, of Poldihütte, Kladno, Bohemia, in the Empire of
Austria, Works Director, do hereby declare the nature of this invention
to be as follows:-
This invention relates to the manufacture of crucible steel and has for its object
to provide a process whereby cheaper and cleaner steel can be produced than by
the ordinary process.
According to the usual process the raw materials are brought directly into the
crucible so that they cannot completely fill the same and any impurities present
in them remain in the crucible steel.
According to the process forming the subject of this invention these disad-
vantages are avoided by subjecting the raw material to a preliminary treatment in
a Martin furnace or in a converter whereby its carbon is reduced to the necessary
quantity and it is freed from manganese, sulphur and phosphorus
The fluid mass is then poured into the crucible which it completely fills on
account of its altered condition of aggregation.
The rest of the process for the refining of the steel resembles the present process.
The resulting product is a very clean material produced at a low cost in con-
sequence of the preliminary treatment in the Martin furnace or converter.
Dated this 28th day of December 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in the Manufacture of Orucible Steel.
I, SEBASTIAN DANNER, of l'oldihütte, Kladno, Bohemia, in the Empire of
Austria, Works Director, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention relates to the manufacture of crucible steel and has for its object
to provide a process whereby cheaper and cleaner steel can be produced than by
the ordinary process.
According to the usual process the raw materials are brought directly into the
crucible so that they cannot completely fill the same and any impurities present
in them remain in the crucible steel.
According to the process forming the subject of this invention these disad-
vantages are avoided by subjecting the raw material to a preliminary treatment in

page_text: a Martin furnace or in a converter whereby its carbon is reduced to the necessary
quantity and it is freed from manganese, sulphur and phosphorus.
The fluid mass is then poured into the crucible which it completely fills on
account of its altered condition of aggregation
The rest of the process for the refining of the steel resembles the usual process:
The resulting product is a very clean material' produced at a low cost in con-
sequence of the preliminary treatment in the Martin furnace or converter.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed. I declare that what
I claim is:
1. The described process) fin; the manufacture of crucible steel, such process con-
sisting in first subjecting the raw material to a preliminary treatment in a Martin
furnace or in a converter so as to reduce its carbon to the. required quantity and
free it from impurities, in then pouring it in a fluid condition into a crucible and
in refining it in the usual manner, substantially as described.
2. Crucible steel manufactured by the process hereinbefore described.
j'
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant..