US1863159A - Alloys - Google Patents

Description

Patented June 14, 1932 UNITED STATES ROBERT ABBOTT HADFIELD, OF WESTMINSTER, ENGLAND ALLOYS No Drawing. Application filed April 26, 1928, Serial 273,156, and in France December 24, 1924.

This application, which is a continuation in part of in application for Letters Patent Serial No. 56,325, dated December 16th, 1924, has reference to the production of alloys capable of oifering considerable resistance to corrosion by air, fresh water, salt water, and various acids and other mediums that attack ordinary iron or steel, and which shall also possess good mechanical characteristics, including high tensile and compression strength and ductility.

Various alloys have heretofore been proposed possessing these characteristics in various degrees and the present invention has for its object to produce alloys possessing the said characteristics in an enhanced degree, whereby they are rendered available for various industrial purposes.

For this purpose, an alloy according to the present invention, comprises, in addition to iron, from about 0.05 to 1% of carbon, from about 6 to 25% of chromium, from about 5 upward but less than 20% of nickel, from about 1 to 5% of tungsten, from about 1 to 3% of copper, from about 0.05 to 1% of silicon and from about 0.10 to 4% of manganese, the combined chromium and nickel content being in all cases from 18 to 32%. The percentage of the various elements contained in such an alloy ma vary within the limits mentioned to suit di erent purposes for which the alloy is to be used.

The following are analyses of some examples of the alloys that have been found, by experiment, to offer excellent resistance to corrosion by acids, both hot and cold, and to other chemicals, for instance a solution of ammonic chloride, and which moreover possess considerable strength and toughness and are capable of being readily worked to convert them into articles of different shapes to adapt them for use in industries of various kinds.

1. Iron, with carbon about 0.20%, nickel about 10.2%, chromium about 16.1%, tungsten about 1.37% and copper about 2%, with about 0.35% of silicon and about 0.39% of manganese.

2. Iron, with carbon about 0.22%, nickel about 7.3%, chromium about 16.2%, tungsten about 1.87% and copper about 1.90%, with about 0.28% of silicon and about 0.10% of balt, vanadium, titanium oraluminium, or

'two or more of such elements, usually in small percentages, say from about 0.5 up to 6%, may, in some cases, also be included in alloys according to the present invention for improving their qualities in certain respects to meet special requirements.

As molybdenum is the equivalent of tungsten in its power of imparting the above mentioned characteristics to the alloy, it is to be understood that this element is included in the term tungsten in the appended claims.

What I claim is I 1. An alloy comprising, in addition to iron, from about 0.05 to 1% of carbon, from about 6 to 25% of chromium, from about 5% upward but less than 20% of nickel, from 1 to 5% tungsten, from 1 to 3% of cop er, from about 0.05 to 1% silicon and from a out 0.10 to 1% of manganese, the combined chromium and nickel content being from 18 to 32%.

' 2. An alloy comprising about 0.20% carbon, about 0.35% silicon, about 0.39% manganese, about 10.2% nickel, about 16.1% chromium, about 1.37% tungsten and about 2% copper, the remainder being principally iron.

3. An alloy comprising about 0.06% carbon, about 0.14% silicon, about 0.52% manganese, about 19.8% nickel, about 10.1% chromium, about 1.94% tungsten and about 1.81% copper, the remainder being principally iron.

4. An alloy comprising about 0.22% carbon, about 7.3% nickel, about 16.2% chromium, about 1.87% tungsten, about 1.9% copper, about 0.28% silicon and about 0.10% manganese.

Signed at the city of London, this third day of April, 1928.

ROBERT ABBOTT HADFIELD.

England,