A NEW OR IMPROVED PROCESS OF MANUFACTURING CAST STEEL
Year: 1872

page_text: LETTERS PATENT to Henri Adrien Bonneville, of the British and
Foreign Patent Offices, 18, Rue de la Chaussée D'Antin, Paris,
France, and 6, Piccadilly, in the County of Middlesex, Patent Agent,
for the Invention of "A NEW OR IMPROVED PROCESS OF MANUFACTURING
CAST STEEL."-A communication from Hilaire André Levallois,
residing at No. 26, Rue de Chabrol, Paris, in France, Metallurgist.
Scaled the 10th October 1872, and dated the 10th August 1872.
COMPLETE SPECIFICATION filed by the said Henri Adrien Bonneville
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 10th August 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRI
ADRIEN BONNEVILLE, of the British and Foreign Patent Offices, 18, Rue
de la Chaussée D'Antin, Paris, France, and 6, Piccadilly, in the County
of Middlesex, Patent Agent, send greeting.
WHEREAS I am in possession of an Invention for "A NEW OR IMPROVED
PROCESS OF MANUFACTURING CAST STEEL," (communicated to me by Hilaire

page_text: André Levallois, residing at 26, Rue de Chabrol, Paris, France, Metal-
lurgist,) and have petitioned Her Majesty to grant unto me, my exe-
cutors, administrators, and assigns, Her Royal Letters Patent for the
same, and have made solemn Declaration that it is a communication.
NOW KNOW YE, that I, the said Henri Adrien Bonneville, do t
hereby declare that the following Complete Specification, under my hand
and seal, fully describes and ascertains the nature of the Invention, and
the manner in which the same is to be performed, that is to say :—
The Invention relates to improvements in the production of a com-
bined quality of cast steel not easily liable to rust, and the cost price of 1
which is about the same as that of ordinary cast steel of good quality,
varying according to the proportion of the elements employed. The
improved process admits of perfect regularity in the manufacture of this
particular quality of steel composed of an alloy of iron, tungsten, and
nickel, in the following proportions (or thereabouts) by weight:-
1

page_text: inverse proportion to the quantity of metal treated, between one-half of
one part and two entire parts of flux to one hundred parts of metal.
As soon as the mass has attained a liquid state it is run off in the
usual way into a sand or metal mould, the latter being coated with a
mixture of clay and per-carburet of iron. Before and during the process
of running off the fused metal a vacuum is produced either in the sand
-or metal mould by covering the bottom of the funnel with a parchment
membrane, which is destroyed by the contact of the fused metal. This
membrane is fixed between the funnel and the tedge.
When the alloy is run into a metal mould the ingot is removed as
soon as it becomes solidified, annealed in a closed vessel, and allowed to
cool gradually.
The steel produced by the above process may be hammered in tho
´same way as ordinary steel.
The flux previously referred to is composed of the following in-
gredients:—For a total of one hundred parts, thirty-six of common
boric acid or sub-borate of soda, thirty-two parts of calcined silex, and
thirty-two parts of washed carbonate of lime. These elements are
pulverised in a mortar together and introduced in small quantities into
a crucible at a white heat, liquified, and run off on to a fluted cast-iron
plate, and, lastly, the flux thus obtained is crushed into small pieces
before it is made use of.
.
What I claim as my Invention, and desire to secure by Letters Patent,
is, the manufacture of a new or improved cast steel by combining soft
iron, tungsten, and nickel in various proportions, as herein described,
other hade
before it is made use of.
What I claim as my Invention, and desire to secure by Letters Patent,
is, the manufacture of a new or improved cast steel by combining soft
iron, tungsten, and nickel in various proportions, as herein described,
without the addition of any other body.
In witness whereof, I, the said Henri Adrien Bonneville, have
hereto set my hand and seal, this Eight day of August, in the
year of our Lord One thousand eight hundred and seventy-two.