14. MATERIAL SELECTION GUIDE
98
Application
Protection tube material
APPLICATIONS / PROTECTION TUBE MATERIALS
Heat treatment
• Annealing
: - up to 704 °C
Black steel
- over 704 °C
Inconel 600, SS 446
• Carburizing hardening
: - up to 816 °C
Black steel, SS 446
-
1,093 °C
Inconel 600, SS 446
- over 1,093 °C
Ceramic
- nitriding salts bath
SS 446
- cyanide
Nickel (CP)
- neutral
SS 446
- high speed
Ceramic
Iron and Steel
• Basic oxygen furnace
Quartz
• Blast furnace:
- down comer
Inconel 600, SS 446
- stove dome
Silicon carbide
- hot blast main
Inconel 600
- stove trunk
Inconel 600
- stove outlet fue
Black steel
• Open hearth:
- fues and stack
Inconel 600, SS 446
- checkers
Inconel 600, cermets
- waste heat boiler
Inconel 600, SS 446
• Billet heating slab heating
and butt welding
: - up to 1,093°C
Inconel 600, SS 446
- over 1,093°C
Silicon ceramic carbide
• Bright annealing batch:
- top work temperature
Not required (use bare wire J T/C)
- bottom work temperature
SS 446
• Continuous furnace section:
- forging
Silicon ceramic carbide
- soaking pits
: - up to 1,093 °C
Inconel 600
- over 1,093 °C
Silicon ceramic carbide
Nonferrous materials
• Aluminium melting
Cast iron (white-washed)
• Aluminium heat treating
Black steel
• Brass or bronze
Not required (use dip-type T/C)
• Lead
SS 446, black steel
• Magnesium
Black steel, cast iron
• Tin
Extra heavy carbon steel
• Zinc
Extra heavy carbon steel