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US 3,994,752 AGranted
Annealing treatment for controlling warhead fragmentation size distribution
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorGeorge A. Hayes
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Abstract
Methods for controlling the sizes and shapes of fragments produced by ward casings are disclosed.
Claims1
A method for controlling the size and shape of fragments produced by a steel warhead casing having the nominal composition 1.1% C, 1.8% Mn, 0.009% P, 0.82% Si, 0.015% S, 0.01% Al and a balance of Fe wherein the percentages are by weight, said method comprising the steps of:
- a. heating said casing to austenitizing temperature of about 1,750.degree. F
- b. oil quenching said casing to a temperature within the range of from 250.degree. F to 150.degree. F;
- c. masking said casing with a plastic cover which leaves a first gridwork of bare metal exposed;
- d. coating said first grid work of bare metal with copper;
- e. removing said plastic cover to expose a second gridwork of non-coated bare metal;
- f. subjecting said casing to a carburizing atmosphere sufficient to produce a carburized gridwork which is more brittle than the copper coated gridwork;
- and
- g. air cooling said casing to room temperature.
5 more elements
Dependencies are inferred from the claim text.