US1948245A - Chilled roll and method of making same - Google Patents

Description

UNITED STATES PATENT OFFICE 1,948,245 CHIILED ROLL AND lWE'IHOD OF MAKING SAME The present William H. Seaman, Hammond, Ind.

No Drawing. Application May 3, 1930, Serial No. 449,688. Renewed December 11, 1933 4 Claims.

invention relates in general to a novel alloy of iron for use in a chilled cast iron roll employed for rolling iron,

metals.

steel and other One of the objects of the present invention is to provide an alloy iron of such character that when cast in a chilled mold will give throughout the chill depth a sclerescopic hardness of from A further object is to provide an iron alloy roll in which the chill is of substantially uniform hardness throughout its depth.

Another object is to provide an iron alloy roll in which the depth of the chill may be varied as desired.

A still further object is to provide an iron alloy chilled roll which may be used in cold rolling.

Still another object is of this character which may entirely for the case hardened forged at present employed in to provide a chilled roll be substituted steel rolls cold rolling.

Still another object is to provide an alloy roll of this character which will wear longer, give more uniform results necessary for this class and be very much cheaper than the case hardened steel of work.

rolls heretofore There are other objects of my invention which together with the foregoing will be described in the detailed specification that is to follow.

It has been exceedingly difficult heretofore to make a chilled cast iron of sufficient hardness to alloy roll which would be be employed for any cold rolling work. This necessitated the employment of a forged steel case exceedingly expensive hardened roll which was and in which it was difficult to secure uniform hardness throughout the surface of the roll. Furthermore, a case hardened roll of this character is soon as the roll wears short lived in that as sufliciently to penetrate to be discarded. Rolls of this character cost as much as $1.25 per pound.

Consequently, in view of rolls was exceedingly eximproved alloy of iron is suitable to work done by these pensive. My

the above objections the be cast in chilled rolls and will give a sclerescopic hardness of from 90 to depth, which may be co quantity of the constitu 100 throughout its chill ntrolled by modifying the ents employed.

The general characteristic of this iron alloy roll is a very high carbon content, the effect of which is to increase the siderably more graphiti interior of the roll.

hardness. There is con- 0 carbon in the gray iron The roll is also characterized by a high nickel content, which increases the hardness and in comb ination with the carbon renders the chill of uniform texture throughout its depth. A very low chromium content is also present, being less than 10% of the nickel. The chromium, in conjunction with the carbon and nickel, produces an alloy which when cast in a chilled mold provides a roll that is exceedingly hard and tough throughout the depth of the chill, as well as being of uniform texture, tough and resilient. Furthermore, the bond between the chill and the gray iron interior is very close.

Of course, in addition to these main constituents there are the usual alloy elements of manganese, silicon, sulphur and phosphorus in suitable proportions. The proportions of the elements of the alloy in addition to iron, to obtain a chilled roll having a sclerescopic hardness from 90 to 100 with the characteristics set forth suitable for substitution in places now requiring I (-Ccrbon may be as high as 3.85 in special instances where more chill and somewhat greater hardness may be required).

This alloy is cast in chilled molds in the same mechanical manner as ordinary chilled rolls. The result is a chilled roll having a sclerescopic hardness throughout its chill which is of considerably greater depth thanordinary, of from 90 to 100, and very strong and tough throughout. This roll will wear longer and give better service than forged steel rolls. This'follows not only from the hardness of the material of the chill but from its uniformity and depth. The cost of making the cast roll is much less than the cost of a forged steel case hardened roll and since, as outlined above, much better results are secured than with the forged steel roll, the work product is more satisfactory and very much cheaper.

The life of this cast roll is also very much longer and the roll presents innumerable advantages over the. forged steel roll, as will be apparent to those skilled in the art. Rolls of this character may be employed for cold rolling 105 wherever it has been necessary heretofore to employ forged steel case hardened rolls. I

My invention may be variously modified without departing from the spirit and scope thereof, as set forth in the appended claims. 1m

Iclaim: 1. The method of making chilled iron alloy rolls which consists in ensuring a chill by using small quantities of silicon, manganese and chromium and securing hardness of said chill by employing carbon and nickel from about 3.25 to about 3.35 carbon and from about 4.75 to about 5.0 nickel.

2. The method of making chilled iron alloy rolls which consists in ensuring a chill by using small quantities of silicon, manganese and chromium and securing hardness of a varying degree by using carbon and nickel in varying amounts from about 3.25 to about 3.35 carbon and from about 4.75 to about 5.0 nickel.

3. The method of making chilled iron alloy rolls which consists in ensuring a chill by using small quantities of silicon, manganese and chromium running from about .15 to about .25 silicon and from about .25 to about .35 chromium and from about .15 to about .20 manganese and securing hardness of said chill by using carbon and nickel as desired from about 3.25 to about 3.35 carbon and from about 4.75 to about 5.0 nickel. 4. A chilled iron alloy roll containing small amounts of silicon, chromium and manganese to ensure a chill, said amounts running from about .15 to about .25 silicon and from about .15 to about .20 manganese and from about .25 to about .35 chromium, said roll also containing substantial quantities of carbon and nickel to secure hardness of said chill, said carbon running from about 3.25 to about 3.35 and said nickel running from about 4.75 to about 5.0.

WILLIAM H. SEAMAN.