US1876724A

US1876724A - Wear resisting ferrous alloy

Info

Publication number: US1876724A
Application number: US421306A
Authority: US
Inventors: Mitchell H Alton; Alfred W Gregg
Original assignee: Bonney Floyd Co
Current assignee: Bonney Floyd Co
Priority date: 1930-01-16
Filing date: 1930-01-16
Publication date: 1932-09-13
Anticipated expiration: 1949-09-13

Description

' 2o many others,

Patented Sept. 13, 1932 H. ALTON MITCHELL AND ALFRED w. QBEGG, OF

BONNEY-FLOYD COMPANY, OF COLUMBUS,

WEAR BESISTING No Drawing.

This invention relates to a novel and improved wear resisting ferrous alloy which we have developed for use in the construction and formation of machine parts that are, in 6 use, subjected to friction, abrasion and other conditions tending to wear and render the' same unfit for eflicient service.

It has long been known that, for parts of machinery which must withstand severe .wear, m abrasion and shock, a relatively soft body of material such as steel, coated or surfaced with a much harder material, gives far superior results. The relatively softer body material has ideal properties to withstand shock without fracture, while the very hard surface will withstand the abrasion and wear to which it may be. subjected. Cases in which our in I vention is especially applicable are, among dipper teeth, bucket lips, tool points, well drilling bits, conveyor parts, crushing rolls and etc. In most cases these parts are made-up of a relatively soft base metal such as cast, rolled or forged carbon or, alloy steel which has inferior abrasion resistant properties. Our invention has partic- .ular reference to a material for applying a surface or coating on such cast, rolled or. forged material to greatly increase its useful life under conditions of -severe service;

The'alloy to which-this invention refers may be cast in suitable form'to cover and protect the parts subjected to wear by at- V taching' it thereto by .welding, mechanical means or it may beprepared in the form of welding rod and applied to these parts by any welding process such as electric arc welding, 40 oxy-acetylene welding and the like. The latter method is usually preferred, but our invention is notto be limited to this preferred method of application.

Broadly, the range of proportions of alloying elements in our composition is as follows:

COLUMBUS OHIO, ASSIGNOBS- TO THE OHIO; A CORPORATION OF OHIO IERROUS ALLOY Application filed January 16, 1980. Serial No. 421,806.

. Per cent the balance being iron, except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

A composition which we have used successfully is as follows:

An alloy of approximately the following composition I Per cent Tungsten 4.00 Chromium 4. 00 Nickel a 1. 00 Carbon 3. 00 Manganese Silicon 1. 00 Aluminum 50 Vanadium 1. 00

the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture. This alloy when applied to the wearing parts of dipper teeth and the like has increased their useful life in many cases as much as tenfold. The resistance to abrasion ,is a direct result of the extreme hardness of the material which in most cases is in excess of 700 measured on standard Brinell hardness scale. This ex:

treme hardness is broughtabout by the pe-.

culiar combination of the alloysused and malntalned without any I hardening heat treatment such as isrequlred by many of theso-called tool steels.

' One of the outstanding features of this alloy resides in the fact that it fuses at arelatively low temperature, considerably below the fusing temperature of other hardening Tungsten 1.00 to 12.00 Chromium 1.00 to 10. 00 Nickel 10 t0 5. 00 Aluminum 10 "to 8. 00 Vanadium 10 to 2. 00 Carbon 1.75 to 4.00 Manganese...- 50 to 5. 00 S1l1con .20 to 3.00

alloys now in use for similar purposes. This low fusing temperature is of very great importance in the matter of avoiding injury to the relatively softer materials to which the alloy is applied. Again, the alloy is both economical to produce and apply and its application to a softer body of metal increases many times the ordinary life of the latter with accompanying economy in the matter of maintaining a machine so protected in prolonged use and operation. This last factor is of considerable importance in the operation of many large machines wherein the time required to replace worn parts is of far greater economic importance than the mere value of the worn or substituted parts.

Molybdenum may be added to the above compositions in amounts from .10% to 6.00%. Examples of such a composition are as follows:

Per cent Tungsten 1. 00 to 12. 00 Chromium -1. 00 to 10. 00 Nickel 10 to 5. 00 Aluminum 10 to 8. 00 Vanadium 10 to 2. 00 Carbon 1.75 to 4.00 Manganese 50 to 5. 00 Silicon 20 to 3. 00 Molybdenum 10 to 6. 00

the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

Per cent Tungsten 2. 00 to 6. 00 Chromium 2. 00 to 6. 00 Nickel 50 t0 3. 00 Aluminum 10 to 4. 00 Vanadium 10 to 1. 00 Carbon 2. 00 to 3. 50 Manganese 50 to 2. 00 Silicon 20 to 2. 00 Molybdenum 3. 00 to 6. 00

the balance being iron except for impurities such as phosphorus and sulphur, which are incldental to the manufacture.

' Per cent Tungsten 4.00 Chromium 4.00 Nickel 1.00 Carbon 3. 00 Manganese .75 Silicon 1. 00 Molybdenum 5.00 Aluminum .50 Vanadium 1. 00

While the invention has been described in detail, particularly with reference to the matter of the specific composition and preparation of the materials entering into the formation of our improved alloy, yet it will be understood that we do not limit ourselves to the exact formula given but reserve the right to employ such variations or equivalents that can be said to fall within the scope and spirit of the following claims.

\Vhat is claimed is:

1. An alloy welding rod containing 1.00% to 12.00% tungsten, 1.00% to 10.00% chromium, .10% to 5.00% nickel, 10% to 8.00% aluminum, .10% to 2.00% vanadium, 1.75% to 4.00% carbon, .50% to 5.00% manganese, .20% to 3.00% silicon, the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

2. An alloy welding rod containing 2.00% to 6.00% tungsten, 2.00% to 6.00% chromium, .50% to 3.00% nickel, .10% to 4.00% aluminum, 10% to 1.00% vanadium, 2.00% to 3.50% carbon, .50% to 2.00% manganese, 20% to 2.00% silicon, the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manuthe balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

4. An alloy welding 'rod containing 1.00% to 12.00% tungsten, 1.00% to 10.00% chromium, .10% to 5.00% nickel, 10% to 8.00% aluminum, .10% to 2.00% vanadium, 1.75% to 4.00% carbon, .50% to 5.00% manganese, .20% to 3.00% silicon, .10% to 6.00% molybdenum, the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

5. An alloy welding rod containing 2.00% to 6.00% tungsten, 2.00% to 6.00% chromium, .50% to 3.00% nickel, .10% to 4.00%

aluminum, .10% to 1.00% vanadium, 2.00%

to 3.50% carbon, .50% to 2.00% manganese. 20% to 2.00% silicon, 3.00% to 6.00% molyb' denum, the balance being iron except for impurities such as phosphorus and sulphur, which are incidental to the manufacture.

6. An alloy welding rod of approximately the following composltion:

Per cent Tungsten 1 4. 00 .Chromium 4.00 NickeL 1.00 Carbon 3.00 Manganese .75 Silicon 1.00 Molybdenum 5.00 Aluminumu; .50 Vanadium 1.00

the balance being iron except for impurities such as phosphorus and sulphur, whioh are incidental to the manufacture.

Intestimony whereof we aflix our signatures.

H. ALTON MITCHELL. ALFRED W. GREGG.