US1857825A - Metal roll - Google Patents

Description

Patented May 10, 1932 PATENT OFFICE WILLIAM H. SEAMAN, OF HAMMOND, INDIANA Maren ROLL No Drawing. Application filed June 27,

My invention relates to metal rolls for rolling metal articles such as metal strips, sheets and all manner of shapes, and particularly to rolls-of this kind known as chilled iron ala loy rolls because of their being cast in a chilled mold or in a sand mold with sufficiently'heavy condensing chills. v

The principal object of the invention is to provide a roll ofthe class specified which shall have certain highly desirable charac- I teristics or qualities such as tou hness, durability, hardness, freedom from re cracking,

,and shall also have a particularly hard outer portion especially advantageous for rolling .15 and advantageously associated with the remainder of the roll.

v The roll herein set forth for carrying out the invention, is a chilled cast iron alloy roll having a substantial or high carbon content running usually from about 3% to 3.75%

- and also having certain other modifying ingredients, such as manganese, silicon, sulphur, phosphorus, chromium and nickel, although not necessarily all of these ingredients or elements. The manganese will run from about to 50%; the sulphur from ap-- proximately .05% to 15%; the phosphorus from about .10% to the silicon from about {75% up, preferably to from .90% to 1.50%; the chromium from about up, preferably, running from about .7 5% to 2.00%; the nickel when used will be preferablyin excess of 20% and running from that amount up to 1.00% or even more. variation is permissible in all these elements or ingredients. Enough iron is used in addition to the foregoing to make up the total of The silicon and chromium, it will be noticed, are in substantial amounts and give the roll certain desirable qualities or characteristics. When the roll is cast either in a chill mold or in a sand mold with sufliciently heavy condensing chills, an outer or primary chill is formed on the outside of the roll and also an inner or secondary chill just 4 inside of the primary chill. The primary chill is. a hard skin or layer of solid close grained white iron and the secondary, chill has a grain structure resembling that of the Some 1927. Serial No. 201,968.

primary chill. Gray or mottled iron forms the central portion of the roll. The second-- ary chill has no clear line of demarkation between itself and the primary chill and the gray iron center or core. In aroll of sub- "stantially the constituency above set forth,

' from one to two inches thick. This produces a very advantageous form of roll because the primary chill is very tough and hard and not likely to break or crack or se arate from the roll and the secondary chill orms a very effective cushion'for the primary chill and an efl'ective connection between the primary k chill and roll center or core and also a very 7 good structure for rolling shapes.

These chills, the primary and secondary, may be varied in absolute and relative size by variation in the amount of silicon and chromium. The depth or size of the primary chill is controlled quite largely by the amount of silicon used, the size or thickness of the chill being less as the amount of silicon increases, and vice versal Similarl the depth or thickness of the secondary chi is largely controlled by the amount of chromium used, this secondary chill being greater as the amount of chromium increases and. less asthe amount of chromium decreases.-

It will be understood that changes and modifications may be made without departin from the spirlt of the invention.

hat I claim is v 1. A high carbon chilled iron alloy roll having small quantities of modifying elements including an appreciable quantity of nickel and also having substantial quantities of hardening and toughening elements and having a close grained white iron primary chill and a secondary chill having no distinct line of demarkation between itand the primary chill and having a grain structure resembling that of the primary chill.

2. 'A high carbon chilled iron alloy roll having small quantities of manganese, 'sul- 9 phur and phosphorus in excess of 10% and also having substantial uantities mium and silicon and having a close grained.

, white iron-primary chill and a secondary chill having no distinct line of demarkation between it and the primary chill and having a grain structure resembling that of the primary chill.

3. A high carbon chilled iron'alloy roll having small quantities of manganese, sulhos horns and an appreciable quantity o nic c1 and also having substantial quantities of chromium and silicon and having a close rained white iron primary chill and a secondary chill having no distinct line oi demarkation between it and the primary chill and having a grain structure resembling that of the primary chill. 1

4. A high carbon chilled iron alloy roll having small quantities of manganese, sulphur, phosphorus in excess of .10% and nickel and also having silicon and chromium each in amount between 1% and 2% and havinga close grained white iron primary chill and asecondary chill having no-distinct line of demarkation. between it and the primary 9 chill.

5. A high carbon chilled iron alloy roll having from 3.00% to 3.75% carbon, about 35% to 50% manganese, about .05% to .08% sulphur, about .20% to'1.00% nickel and from about 1.00%. to 1.50% silicon and about .7 5% to 2.00% chromium and having aclose grained white iron primary chill and a secondary chill having no distinct line of demarkation between it and the primary chill and having a grain structure resembling that of the primary chill and a gray or mottled iron core underlying the secondary chill. 6. A chilled castiron roll containing total carbon about 3.00% to 3.75%, chromium about .7 0% to 1.25%, phosphorous from-about 10% to about .40%, sulphur not over about 10% silicon about 50% to 1.50%, and manganese about .35% to 50%, and having a close grained white iron primary chill and a secondary chill having no distinct line of demarkation between it and the primary chill and having a grain structure resembhng that of the primary chill, and a gray or mottled iron core underlying the secondary chill,

In witness whereoflI hereunto. subscribe my'name this 24thday of Jun A. D., 1927. WILLIAM H. SEAMAN, v

of chro-