US1948244A - Chilled roll and method of making same - Google Patents

Description

Patented Feb. 20, 1934 CHILLED ROLL AND METHOD OF MAKING SAME William H. Seaman, Hammond, Ind.

No Drawing. Application May 3, 1930, Serial No. 449,687. Renewed December 11, 1933 2 Claims. (01. 80-58) The present invention relates in general to a novel alloy of iron for use in a chilled cast iron roll employed for rolling steel and other metals.

One of the objects of the present invention is to provide an alloy iron of such character that when cast in chill molds will give a sclerescopic hardness throughout the chill of from 80 to 90.

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.

A still further object is to provide an iron alloy chilled roll which may be-used convenient- 1y for rolling mill work.

Still another object is to provide a chill roll of this character which for lighter work may be employed in cold rolling.

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

It has been difficult to obtain an alloy cast iron roll which could be employed for cold rolling work. This necessitated the employment of a forged steel case hardened roll which was not only exceedingly expensive, but short lived and diflicult to make.

My improved alloy of iron is suitable to be cast into chill rolls and will have a sclerescopic hardness of from 80 to 90 throughout the chill.

The general characteristic of this iron alloy roll is a very high carbon content, the efiect of which is to increase the hardness. This results in considerably more graphitic carbon in the gray iron interior of the roll. There is also a high nickel content which increases the hardness and in combination with the carbon renders the chill of uniform texture throughout the chill. Alow chromium content is also present, being approximately 10% olf the nickel. The chromium in connection with the carbon and nickel produces a chilled alloy iron roll that is exceedingly hard throughout the depth thereof as well as being of uniform texture, tough and resilient.

Of course, in addition to these main constituents there are the usual elements of manganese, silicon, sulphur, and phosphorus in suitable proportions. The proportions of the elements of the iron alloy in addition to iron to obtain a chill roll having a sclerescopic hardness of 80 to 90 and the characteristics set forth are given below:--

'r.c. Mn Si s P Cr Ni 3.15 .18 .25 .115 .18 .25 3.50 Hardness 80 to 90 to to to to to to to The sclerescopic hardness from 85 to 90 permits cold rolling of numerous shapes which have heretofore required case hardened forged steel rolls. This greatly reduces the cost of material rolled.

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

I claim:

1. 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 .25 to about .35 silicon and from about .25 to about .35 chromium and from about .18 to about .22 manganese and securing hardness of said chill by using carbon and nickel as desired from about 3.15 to about 3.20 carbon and from about 3.50 to about 4.0nickel.

2. A chilled iron alloy roll containing a small amount of silicon, chromium and manganese to ensure a chill, said amounts running from about .25 to about .35 silicon and from about .18 to about .22 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 3.15 to about 3.20 and said nickel running from about 3.50 to about 4.0.

' WILLIAM H. SEAMAN.