US670453A - Steel casting. - Google Patents

Description

NITED STATES PATENT OFFICE.

ANDRES G. LUNDIN, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE PLACE.

STEEL CASTING.

SPECIFICATION forming part of Letters Patent N 0. 670,453, dated March 26, 19 01.

Application filed January 1 9| 1 89 9.

To aZZ whom it may concern:

Be it known that I, ANDRES G. LUNDIN, a subject of the King of Sweden and Norway, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Steel Castings, of which the following is a specification.

My invention relates to the manufacture of steel castings containing the ingredients IO mentioned below, such ingredients or constituents being in the proportions hereinafter set forth.

The present invention is particularly adapted for the manufacture of steel castings of medium or light weight, including softand tough castings, such as bicycle parts, and hard castings, such as chisels, hatchet-s, &c. I have found'by long experiment that such tools can be cast by means of my method and the employment of the ingredients proportioned as below specified and that the tools when cast are capable of receiving and retaining an excellent edge. Moreover, such castings as bicycle parts when made by my invention can be Welded, as I have found by actual experiment, so that an occasional defect may be remedied by the welding process.

In this invention I take steel scrap and melt it and add ferrosilicon, ferromanganese, and

aluminium in the manner and proportions indicated by the following example of manufacture:

One hundred (100) pounds of steel scrap is placed in a crucible in a furnace and melted to a boiling-point-say about 4,000 Fahrenheit. When the boiling point has been reached, one and a half (1%) to two and a half (2 pounds of ferrosilicon containing twelve (12) per cent. silicon is thrown into the molten metal. After the ferrosilicon has melted two (2) to eight (8) ounces of ferromanganese containing eighty (80) per cent. manganese is mixed with three pounds or less of aluminium, and this mixture is thrown into the molten metal, in which it quickly melts. The resulting composition or alloy is,

after all its constituents parts are melted, poured into a mold and cast into the shape Serial No. 702,739. (No specimens.)

desired. It will thus be seen that the percentage in weight of the ingredients added to the molten metal is substantially as follows: Fe rrosilicon containing twelve per cent. silicon, 1.5 to 2.5 per cent; ferromanganese containing eighty per cent. manganese, .125 to .5 per cent; aluminium, three per cent. or less.

It will readily be seen that the product of the above-described process is a trifle over one hundred pounds of metal, probably not more than one hundred and three or one hundred and four pounds, containing an addition to the original one hundred pounds of pure silicon 2.88 ounces to 4.8 ounces, equaling .18 to .3 per cent; pure manganese, 1.6 ounces to 6.4 ounces, equaling .1 to .4 per cent. aluminium, three pounds or less, equaling three per cent. or less, and the iron which bore the silicon and manganese.

Of course I do not confine myself to the employment of ferrosilicon or ferromanganese with the exact proportions of silicon and manganese mentioned; but if I use ferrosilicon containing a greater or less percentage than twelve per cent. of silicon or ferromanganese containing a greater or less percentage than eighty per cent. of manganese I vary the proportions of ferrosilicon and ferronianganese inserted in the molten metal so as to produce the above-mentioned proportions of pure siliconand pure manganese-viz., .18 to .3 per cent. of pure silicon and .1 to .4 per cent. of pure manganese in the product. a

I am aware that it is not broadly newin metallurgy to apply ferrosilicon or ferromanganose in certain proportions to molten metal, and I am also aware that aluminium has been used as an alloy in the manufacture of iron and steel. In this invention it should be understood that the improvement relates to the manufacture, of steel castings and also that the range of proportions above mentioned is essential in effecting the desired result.

In the example of man ufactu re given above I have mentioned that the scrap is melted in a crucible. I do not, however, confine myself to the employment of a crucible, as the scrap can be melted by the open-hearth pr0c-v ess, if desired.

Having thus fullydescribed my invention, what I claim, and desire to secure by Letters Patent, is-

As a new and improved article of manufacture, steel castings containing .18 per cent.

to .3 per cent. of silicon, .1 per cent. to .4 per cent. of manganese and three per cent. or less of aluminium.

ANDRES G. LUNDIN. Witnesses:

HENRY W. WILLIAMs, A. N. BONNEY.