| 摘要 |
<p>A ferrous forging billet is treated before heating for forging by grit blasting it with aluminum oxide grit having a pre-blasting particle size in the range of from about 100 microns to about 180 microns, at a pneumatic pressure in the range of from about 60 psi to about 160 psi, and for a time period in the range of from about 30 seconds to about 60 seconds, so as to remove pre-existing scale from the surface of the billet stock, to roughen the cleaned billet surface and to embed particles of aluminum oxide in the cleaned and roughened billet surface, thereby to form a tightly adhering deposit of aluminum oxide particles which are dispersed over the billet surface and cover at least 10% thereof. This substantially inhibits the formation of oxides on the surface of the billet during heating for forging. <IMAGE></p> |
