Abstract: An aluminum alloy product of extremely high hardness is conformable for use in the manufacture of various products, such as, golf clubs and pump partshaving a body or first layer of an aluminum alloy treated by successive precipitation hardening and reverse quenching to produce a hardness exceeding 140 HBN, and an outer alumina layer or surface coating is applied by hard-anodizing to a predetermined thickness on the first layer and being of even greater hardness than the first layer.

Abstract: A process for removing impurities from molten metal by propelling a bullet toward and into the molten metal at a velocity sufficient for the bullet to penetrate, vaporize, and react with the impurities. The bullet contains a reactive substance, is heavier than the molten metal, and is formed of a metal or metals which are to remain with the molten metal when it is solidified.

Abstract: Magnesium bullets are shot into molten Ferrous alloys in a ladle to react with oxygen and sulfur to form magnesium gas and slag. Boron and ferro-boron bullets are also employed with magnesium bullets. The resulting iron alloys have superior physical properties. The machine which discharges the bullets into the ladle includes a first solenoid actuated gate supporting the lowermost bullet in a column of additive bullets received in a tubular upright magazine of an air gun so as to release the bullets by gravity, one at a time, into the chamber of the air gun.The air gun is disposed over a container of molten metal. A second solenoid actuated gate releasably supports the bullet in the chamber and a solenoid actuated valve in a compressed air line releases the air to drive the bullet down through the barrel of the gun and into molten metal. The angle of the counce can be varied. The arrangement is particularly useful for introducing magnesium into white iron and introducing boron into gray steel.