Method of making a hardened bullet

Details Method of making a hardened bullet Method of making a hardened bullet

1993-10-26

1995-11-07

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148400, C22C 1100, F42B 700

Patent

active

054644879

ABSTRACT:
A method of a hardening a solid metal object consisting essentially of lead which has been swaged cold wrought, such as a bullet, and a hardened swaged wrought bullet are disclosed in which the bullet is formed from a lead or lead alloy blank by swaging the blank under high pressure in a forming die, heating the formed wrought bullet to a temperature near but less than the slump temperature of the metal, and then quenching the heated swaged wrought bullet in a liquid to rapidly reduce its temperature. The swaged wrought bullet as thus formed is seamless and has a hardness which exceeds at least 15 Brinell.

REFERENCES:
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patent: 4048922 (1977-09-01), Buljovcic
patent: 4332629 (1982-06-01), McWhinnie
patent: 4528911 (1988-07-01), DePhillipo et al.
patent: 4753688 (1988-06-01), Myers
Metals Handbook, American Society for Metals, 8th Ed., vol. 1, 1961, p. 1061.
Metals Handbook, American Society for Metals, 10th Ed., vol. 2, 1990, pp. 544, 546, 547, 550.
Scovill, Heat-Treating Cast Bullets, The Handloaders' Bullet Making Annual, 1990, pp. 18, 19, 82-85.
Venturino, Reloading, Handgunning, Nov./Dec. 1993, pp. 24 and 26.

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