C
SECTION C — CHEMISTRY AND METALLURGY
  
METALLURGY
 C21
METALLURGY OF IRON
 C21B
MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00)
 C21B

Note(s)

This sub-class covers the production of iron or steel from source materials, e.g. the production of pig-iron, and apparatus specially adapted therefor, e.g. blast furnaces, air heaters (furnaces in general F27).

 C21B 1/00
( transferred to C22B 1/00 )
 C21B 3/00
General features in the manufacture of pig-iron (mixers for pig-iron C21C 1/06)
 C21B 3/02
·  by applying additives, e.g. fluxing agents
 C21B 3/04
·  Recovery of by-products, e.g. slag
 C21B 3/06
·  ·  Treatment of liquid slag (slag wool C03B; slag stones C04B)
 C21B 3/08
·  ·  ·  Cooling slag
 C21B 3/10
·  ·  ·  Slag pots; Slag cars
 C21B 5/00
Making pig-iron in the blast furnace
 C21B 5/02
·  Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
 C21B 5/04
·  Making slag of special composition
 C21B 5/06
·  Using top gas in the blast furnace process (in coke ovens C10B)
 C21B 7/00
Blast furnaces (lifts associated with blast furnaces B66B 9/06)
 C21B 7/02
·  Internal forms
 C21B 7/04
·  with special refractories (refractory materials C04B)
 C21B 7/06
·  ·  Linings for furnaces
 C21B 7/08
·  Top armourings
 C21B 7/10
·  Cooling; Devices therefor
 C21B 7/12
·  Opening or sealing the tap holes
 C21B 7/14
·  Discharging devices, e.g. for slag
 C21B 7/16
·  Tuyères
 C21B 7/18
·  Bell-and-hopper arrangements
 C21B 7/20
·  ·  with appliances for distributing the burden
 C21B 7/22
·  Dust arresters
 C21B 7/24
·  Test rods or other checking devices
 C21B 9/00
Stoves for heating the blast in blast furnaces
 C21B 9/02
·  Brick hot-blast stoves
 C21B 9/04
·  ·  with combustion shaft
 C21B 9/06
·  ·  Linings
 C21B 9/08
·  Iron hot-blast stoves
 C21B 9/10
·  Other details, e.g. blast mains
 C21B 9/12
·  ·  Hot-blast valves or slides for blast furnaces (valves in general F16K)
 C21B 9/14
·  Preheating the combustion air
 C21B 9/16
·  Cooling or drying the hot-blast
 C21B 11/00
Making pig-iron other than in blast furnaces
 C21B 11/02
·  in low shaft furnaces
 C21B 11/06
·  in rotary kilns
 C21B 11/08
·  in hearth-type furnaces
 C21B 11/10
·  in electric furnaces
 C21B 13/00
Making spongy iron or liquid steel, by direct processes
 C21B 13/02
·  in shaft furnaces
 C21B 13/04
·  in retorts
 C21B 13/06
·  in multi-storied furnaces
 C21B 13/08
·  in rotary furnaces
 C21B 13/10
·  in hearth-type furnaces
 C21B 13/12
·  in electric furnaces
 C21B 13/14
·  Multi-stage processes
 C21B 15/00
Other processes for the manufacture of iron from iron compounds (general methods of reducing to metal C22B 5/00; by electrolysis C25C 1/06)
 C21B 15/02
·  Metallothermic processes, e.g. thermit reduction
 C21B 15/04
·  from iron carbonyl