C21B   3/00		Ŵ¤ˤŪħʺϧãã	General features in the manufacture of pig-iron(mixers for pig-iron <b>C21C1/06</b>)	394
C21B   3/02		źʪ㡥Ϻޡä뤳Ȥˤ	by applying additives, e.g. fluxing agents	416
C21B   3/04		ʪ㡥饰β	Recovery of by-products, e.g. slag	1630
C21B   3/06		ͻվ饰ν	Treatment of liquid slag	4816
C21B   3/08		饰	Cooling slag	4886
C21B   3/10		饰ݥåȡ饰	Slag pots; Slag cars	1616
C21B   5/00		ϹϧˤŴ¤	Making pig-iron in the blast furnace	11336
C21B   5/02		üŴ¤㡥źʪ㡥¾°λʪźäˤ	Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals	767
C21B   5/04		üΥ饰¤	Making slag of special composition	379
C21B   5/06		ϹϧˡˤϧĺѤ	using top gas in the blast furnace process	1431
C21B   7/00		Ϲϧ	Blast furnaces	7429
C21B   7/02			Internal forms	278
C21B   7/04		üѲʪĤ	with special refractories	293
C21B   7/06		ϧΤΥ饤˥	Linings for furnaces	1660
C21B   7/08		ϧĺ	Top armourings	281
C21B   7/10		ѡ	Cooling; Devices therefor	4428
C21B   7/12		иΤ󹦤ޤ̩	Opening or sealing the tap holes	3778
C21B   7/14		ӽ֡㡥饰	Discharging devices, e.g. for slag	3903
C21B   7/16			Tuy&egrave;res	4406
C21B   7/18		٥뤪ӥۥå	Bell-and-hopper arrangements	2680
C21B   7/20		ʪʬۤ뤿֤Ĥ	with appliances for distributing the burden	3216
C21B   7/22			Dust arresters	2675
C21B   7/24		ޤ¾θ	Test rods or other checking devices	5490
C21B   9/00		ϹϧؤξǮ뤿Ǯϧ	Stoves for heating the blast in blast furnaces	1798
C21B   9/02		Ǯϧ	Brick hot-blast stoves	456
C21B   9/04		ǳƥեȤĤ	with combustion shaft	250
C21B   9/06		饤˥	Linings	521
C21B   9/08		ݴɼǮϧ	Iron hot-blast stoves	72
C21B   9/10		¾κ㡥	Other details, e.g. blast mains	1994
C21B   9/12		ϹϧǮۤޤϥ饤	Hot-blast valves or slides for blast furnaces	745
C21B   9/14		ǳѶͽǮ	Preheating the combustion air	414
C21B   9/16		ǮѤޤϴ	Cooling or drying the hot-blast	424
C21B  11/00		ϹϧˤʤŴ¤	Making pig-iron other than in blast furnaces	2059
C21B  11/02		㥷եϧˤ	in low shaft furnaces	1276
C21B  11/06		꡼ˤ	in rotary kilns	199
C21B  11/08		ϧϧˤ	in hearth-type furnaces	348
C21B  11/10		ŵϧˤ	in electric furnaces	828
C21B  13/00		ľˡˤ볤ŴޤϹݤ¤	Making spongy iron or liquid steel, by direct processes	8000
C21B  13/02		ľΩϧˤ	in shaft furnaces	2610
C21B  13/04		ȥȤˤ	in retorts	304
C21B  13/06		¿ϧˤ	in multi-storied furnaces	265
C21B  13/08		žϧˤ	in rotary furnaces	1634
C21B  13/10		ϧϧˤ	in hearth-type furnaces	1373
C21B  13/12		ŵϧˤ	in electric furnaces	1318
C21B  13/14		¿ʳˡ	Multi-stage processes	2216
C21B  15/00		¾ˡˤŴʪŴˡŲˡˤΣãã	Other processes for the manufacture of iron from iron compounds(by electrolysis <b>C25C1/06</b>)	927
C21B  15/02		ǮȿˤΡ㡥ƥߥåȴԸ	Metallothermic processes, e.g. thermit reduction	194
C21B  15/04		Ŵܥ˥뤫Τ	from iron carbonyl	83
