Salamander A-20 Super Crucible
- Brand: Salamander
- Style: A-20
- Material: Ceramic Bonded Clay Graphite
- Dimensions: 197mm (top dia.) 260mm (inside hgt) x 145mm (bottom dia.)
- Crucible Capacity: 47.8kg 14kt Au
- Casting Temperature: 850°C - 1600°C (1562°F - 2912°F)
- Designed for: Fuel-Fired and Medium / High-Frequency Induction Furnaces
- Country of origin: United States
Proven by their quality and long life!
A high quality ceramic bonded clay graphite crucible range manufactured by plastic forming techniques.
These crucibles are used to provide consistent performance in fuel-fired furnaces and medium / high-frequency induction furnaces. The smaller sizes are typically used to melt precious metals, while larger sizes can be used for some ferrous alloys such as grey iron as well as to melt non-ferrous alloys.
Manufactured from premium grade raw materials to ISO9000:2000 quality standards.
- Clean melting
- High refractoriness
- Good thermal conductivity
- Good resistance to chemical corrosion
Preheating / First Use
A new crucible should initially be heated slowly and evenly to 600ºC on low power, avoiding local impingement of flame. Subsequently, the full heat input rate should be utilized to achieve a uniform bright red condition over the whole crucible (circa 900ºC / 1650ºF) at which point the crucible should be charged immediately taking care to avoid packing metal tightly or bridging ingots across the crucible. The furnace controls can then be set to achieve the desired metal operating temperature and heating should continue at the full rate until the metal has reached the desired temperature. In the case of crucibles to be fed with molten metal, it is important that the crucible body temperature is equivalent to or slightly above that of the molten metal in order to minimize thermal stress.
As soon as the crucible has reached the specified pre-heat temperature, charge and melt immediately. Charge light scrap and returns first in order to form a cushion for heavier material. Use tongs to charge ingots and place large pieces and ingots vertically allowing space for expansion. Only add flux once the metal is molten.