Treatment of Cast Iron.
Year: 1892

page_text: Date of Application, 22nd Mar., 1892
Complete Specification Left, 22nd Dec., 1892-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
Treatment of Cast Iron.
We, FREDERICK SUGDEN of 31 Bathley Street, Meadows, Nottingham,
Gentleman and THOMAS SUGDEN of 30 Melford Road, Forrest Hill, London,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
The invention has for its object the treatment of cast-iron so as to render it
capable of being hardened in a similar manner to steel.
The treatment consists essentially in adding to cast-iron while in a fluid or molten
state, a quantity of bone or bone dust. A suitable proportion of bone to metal is
from 3 to 10% according to quality.
A convenient way of introducing the bone or bone dust is to place it in the ladle
before pouring in the molten metal from the cupola; the whole being then well
stirred together so as to become thoroughly mixed.
By preference bones are used which have been steamed and freed from fatty
matter, dirt, sand and the like.
The hardening effected by this process is uniform through the material, and by
re-heating and allowing it to cool, it may be softened. The hardening and softening
may be effected several times.
Cast iron which has undergone this treatment may be machined in the ordinary
way before hardening.
Dated this 4th day of March 1892.
GEO. H. RAYNER,
37, Chancery Lane, London, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Treatment of Cast Iron.
We, FREDERICK SUGDEN, of 31 Bathley Street, Meadows, Nottingham,
Gentleman and THOMAS SUGDEN of 30 Melford Road, Forrest Hill, London,
Mechanical Engineer, 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 has for its object the treatment of cast iron so as to render it
capable of being hardened in a similar manner to steel.
The treatment consists essentially in adding to cast iron while in a fluid or molten
state, a quantity of bone or bone dust. A suitable proportion of bone to metal is
from 3 to 10%, according to quality of iron. A convenient way of introducing
the bone or bone dust is to place it in the ladle before pouring in the molten
metal from the cupola, the whole being then well stirred together so as to become
thoroughly mixed.
By preference bones are used which have been steamed and freed from fatty
matter, dirt, sand and the like. The hardening effected by this process is uniform
through the material, and by rebeating and allowing it to cool, it may be softened.
The hardening and softening may be effected several times. Cast iron which
has undergone this treatment may be machined in the ordinary way before
hardening.
The process of making castings by this method does not differ from the ordinary
practice of an iron-founder, excepting in the addition of bone or bone dust to

page_text: the metal when in a fluid state. By this process articles can be made by the
ordinary process of casting which are otherwise made of wrought iron.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The treatment of cast iron by the addition of bone or bone dust in about
the proportions mentioned, according to the quality of the metal, while the
latter is in a molten or fluid state, substantially as described and for the purposes
specified.
Dated this bond day of Decembar 1005
GEO. H. RAYNER,.
37, Chancery Lane, London, W.C., Agent for the Applicants.