| 摘要 |
A heat treatment process for metal articles in a roll type furnace is disclosed, in particular relatively thin for steel parts which easily warp when exposed to heat, such as ball bearing raceways, sheet metal rounds, blades and the like. The metal articles are heated in stages up to 800-850 DEG C in several pre-heating zones (I, II) with atmospheres containing free oxygen. Then the metal articles are heated in a high temperature zone (III) in a reducing atmosphere containing no free oxygen and run through this zone relatively quickly. The burners of the high temperature zone (III) are timed with shorter or longer periods, depending on the quantity of metal articles supplied and the amount of heat to be transmitted. The rolls are set in the high temperature zone (III) at a short distance from each other and the baffle plates (S, US) between the zones (I, II, III) are set at the smallest possible distance from the rolling track or the metal articles on the rolling track. The burners are located above and below the rolling track. |
