C21D   1/00		Ǯ㡥ƤʤޤŲޤϾᤷΰŪˡޤ	General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering	16737
C21D   1/02		¤ޤϰˤ줿ʤޤϺιŲǤäѰʳβǮɬפȤʤ	Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation	1344
C21D   1/04		ĶȡޤųʻѤ	with simultaneous application of supersonic waves, magnetic or electric fields	1498
C21D   1/06		ɽ̹Ų	Surface hardening	3916
C21D   1/08		бˤ	with flames	528
C21D   1/09		ŵŪ뤤ưͥ륮ˤΡγͤˤΡΣ	by direct application of electrical or wave energy; by particle radiation	4061
C21D   1/10		ŵͶƳˤΡΣ	by electric induction	7512
C21D   1/18		ŲʣãģͥˡθξƤɤȼ뤤ȼʤʾ֣ãģˡΣ	Hardening(<b>C21D1/02</b> takes precedence);Quenching with or without subsequent tempering(quenching devices <b>C21D1/62</b>)	22718
C21D   1/19		ǾˤΡΣ	by interrupted quenching	880
C21D   1/20		졤㡥١ʥȹŲΣ	Isothermal quenching, e.g. bainitic hardening	1525
C21D   1/22		ޥƥѡΣ	Martempering	505
C21D   1/25		áäδ֤ξƤʤޤȤ߹礻ŲʤĴΣ	Hardening, combined with annealing between 300 &deg;C and 600 &deg;C, i.e. heat refining ("Verg&uuml;ten")	2383
C21D   1/26		Ƥʤޤˡ	Methods of annealing	21896
C21D   1/28		Ƥʤ餷	Normalising	4289
C21D   1/30		ϽƤʤޤ	Stress-relieving	2425
C21D   1/32		𲽾Ƥʤޤ㡥	Soft annealing, e.g. spheroidising	2196
C21D   1/34		Ǯˡʣãģͥ	Methods of heating(<b>C21D1/06</b> takes precedence)	5036
C21D   1/38		ŤˤǮ	Heating by cathodic discharges	272
C21D   1/40		ľ񹳲Ǯ	Direct resistance heating	1922
C21D   1/42		ͶƳǮ	Induction heating	8006
C21D   1/44		Ǯˤ	in heat-treatment baths	351
C21D   1/46			Salt baths	1278
C21D   1/48		°	Metal baths	205
C21D   1/50			Oil baths	90
C21D   1/52		бˤ	with flames	2655
C21D   1/53		ήưǤβǮΣ	Heating in fluidised beds	378
C21D   1/54		ޤŵŪ¬ˤŲη	Determining when the hardening temperature has been reached by measurement of magnetic or electrical properties	62
C21D   1/55		㡥ü̾Σ	Hardenability tests, e.g. end-quench tests	280
C21D   1/56		ޤˤäħŤ줿	characterised by the quenching agents	635
C21D   1/58			Oils	1086
C21D   1/60			Aqueous agents	1826
C21D   1/607		ͻΣ	Molten salts	487
C21D   1/613		Ρ̾ϵΤǤղ뤤϶ŸǤƤΣ	Gases; Liquefied or solidified normally gaseous material	904
C21D   1/62			Quenching devices	10845
C21D   1/63		ˤΡΣ	for bath quenching	6908
C21D   1/64		ήΤˤΡΣ	with circulating liquids	2277
C21D   1/667		ץ졼ѤΤΡΣ	for spray quenching	6649
C21D   1/673		ѤΤΡΣ	for die quenching	1990
C21D   1/68		Ǯ뤤Ϥδ֤ŬѤŪʤʪ뤤ߺ	Temporary coatings or embedding materials applied before or during heat treatment	672
C21D   1/70		Ǯ뤤ϾΤ	while heating or quenching	1880
C21D   1/72		ɽ̤βѲ֤ݸʤ	during chemical change of surfaces	303
C21D   1/74		ԳʷϵޤʴǤǮˡ	Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material	7982
C21D   1/76		ʷϵĴ	Adjusting the composition of the atmosphere	3787
C21D   1/767		۴ĤˤΡƲǮΡΣ	with forced gas circulation; Reheating thereof	1047
C21D   1/773		뤤ϿˤΡΣ	under reduced pressure or vacuum	4107
C21D   1/78		ʬवʤȤ߹碌Ǯ	Combined heat-treatments not provided for above	2534
C21D   1/82		ǮϤˤæˡʵŪæ££ŪæãŲŪæãƣ	Descaling by thermal stresses(mechanically <b>B21</b>, <b>B23</b>; chemically <b>C23</b>; electrolytically <b>C25F1/00</b>)	207
C21D   1/84		椵줿ʶ°ΰѤѾ££ˡΣ	Controlled slow cooling(cooling-beds for metal rolling <b>B21B43/00</b>)	1311
C21D   3/00		Ȼˡˤ°νѤϧʶŪݸʤãģ	Diffusion processes for extraction of non-metals; Furnaces therefor(local protective coatings <b>C21D1/72</b>)	160
C21D   3/02		°ν	Extraction of non-metals	157
C21D   3/04		æú	Decarburising	1196
C21D   3/06		Ǥν	Extraction of hydrogen	473
C21D   3/08		Ǥν	Extraction of nitrogen	92
C21D   3/10		°νѤϧ	Furnaces therefor	102
C21D   5/00		ŴǮ	Heat treatment of cast-iron	2843
C21D   5/02		ͤŴββ	improving the malleability of grey cast-iron	66
C21D   5/04		ŴǮ	of white cast-iron	210
C21D   5/06		ò	Malleabilising	41
C21D   5/08		úǤλˤ	with oxidation of carbon	15
C21D   5/10		ʪǹԤʤ	in gaseous agents	88
C21D   5/12		ξʪǹԤʤ	in solid agents	15
C21D   5/14			Graphitising	75
C21D   5/16		Ƥ	Packing agents	1
C21D   6/00		ŴǮΣ<br><br><b><ul></ul></b><br>ʣ˥롼ףʬहȤϡͭѤʾɽƤȻפŴǮˡ˴ؤϡ롼ףãģãģʬषƤ褤㤨Фϡʬ൭ȹ碌ѤŴǮˡθǽȤʤ뤳ȤפǤȹͤˤ롣̳ŪʬϡղþɤȤͿ롣Σ<br>ʣ˥롼ףʬहȤϡͭѤʾɽƤȻפʪϡ롼ףããããʬषƤ褤㤨Фϡʬ൭ȹ碌ѤŴǮθǽˤʤ뤳ȤפǤȹͤˤ롣̳ŪʬϡղþɤȤͿ롣Σ	Heat treatment of ferrous alloys; <br><br><b><u>Note(s)</u></b><br><br><ul><li>When classifying in group <b>C21D6/00</b>, any aspect of the method for the heat treatment of ferrous alloys which is considered to represent information of interest for search may also be classified in groups <b>C21D1/02 to C21D1/84</b> . This can, for example, be the case when it is considered of interest to enable searching of heat treatment methods of ferrous alloys using a combination of classification symbols. Such non-obligatory classification should be given as "additional information".</li><li>When classifying in group <b>C21D6/00</b>, any alloying constituent which is considered to represent information of interest for search may also be classified in groups <b>C22C38/02 to C22C38/60</b> . This can, for example, be the case when it is considered of interest to enable searching of heat treatment of specific ferrous alloys using a combination of classification symbols. Such non-obligatory classification should be given as "additional information".</li></ul>	20693
C21D   6/02		ϽФˤŲΣ	Hardening by precipitation	1189
C21D   6/04		ðʲѤˤŲΣ	Hardening by cooling below 0&deg; C	1639
C21D   7/00		ùѷˤŴޤϹݤʪŪβɡʶ°εŪù֣£££	Modifying the physical properties of iron or steel by deformation(apparatus for mechanical working of metal <b>B21</b>, <b>B23</b>, <b>B24</b>)	800
C21D   7/02		ֲùˤ	by cold working	1470
C21D   7/04		ɽֲ̤ù	of the surface	1448
C21D   7/06		åȥԡ˥󥰤ޤϤहΤˤ	by shot-peening or the like	3018
C21D   7/08		Х˥󥰻ž夲ޤϤहΤˤ	by burnishing or the like	252
C21D   7/10		ṳ̀ˤ֤Ρ㡥󥯥꡼Ŵ	of the whole cross-section, e.g. of concrete reinforcing bars	639
C21D   7/12		ɾΤγȴɤˤ	by expanding tubular bodies	227
C21D   7/13		Ǯֲùˤ	by hot working	1932
C21D   8/00		Ǯȷ礷ѷ뤤ϸǮȼѷˤŴ°ޤŴʪŪβɡ¤뤤ϰˤ줿ʤ뤤ϺιŲǤäѰʳβǮɬפȤʤΣãģˡΣ	Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation <b>C21D1/02</b>)	12792
C21D   8/02		Ĥ뤤ϥȥåפ¤ˤΡʣãģͥˡΣ	during manufacturing of plates or strips (<b>C21D8/12</b> takes precedence)	31224
C21D   8/021		󥴥åȤޤϥ֤¤ޤϽޤΡΣ	involving particular fabrication steps or treatments of ingots or slabs	
C21D   8/0221		ùʳħΡΣ	characterised by the working steps	
C21D   8/0247		ǮħΡΣ	characterised by the heat treatment	
C21D   8/0278		ɽ̽ޤΡʣãģͥˡΣ	involving a particular surface treatment(<b>C21D8/0294</b> takes precedence)	
C21D   8/0294		ޤΡΣ	involving a localised treatment	
C21D   8/04		ʤѤĤ뤤ϥȥåפ¤㡥ʤѤΤΡΣ	to produce plates or strips for drawing, e.g. for deep-drawing	3313
C21D   8/06		뤤¤ˤΡΣ	during manufacturing of rods or wires	7269
C21D   8/08		󥯥꡼䶯ΤΤΡΣ	for concrete reinforcement	1183
C21D   8/10		ɾΤ¤ˤΡΣ	during manufacturing of tubular bodies	4365
C21D   8/12		üżͭʤ¤ˤΡΣ	during manufacturing of articles with special electromagnetic properties	10340
C21D   8/1205		󥴥åȤޤϥ֤¤ޤϽޤΡΣ	involving particular fabrication steps or treatments of ingots or slabs	
C21D   8/1216		ùʳħΡΣ	characterised by the working steps	
C21D   8/1244		ǮħΡΣ	characterised by the heat treatment	
C21D   8/1277		ɽ̽ޤΡʣãģͥˡΣ	involving a particular surface treatment(<b>C21D8/1294</b> takes precedence)	
C21D   8/1294		ޤΡΣ	involving a localised treatment	
C21D   9/00		ʪѤǮ㡥ƤʤޤŲޤϾᤷѤϧ	Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor	47080
C21D   9/02		Х	for springs	2844
C21D   9/04		졼	for rails	1877
C21D   9/06		ȷˤʤ뷹򾯤ʤ	with diminished tendency to become wavy	225
C21D   9/08		ɾΤӥѥ	for tubular bodies or pipes	10773
C21D   9/10		ƽƽƿ	shotgun barrels	45
C21D   9/12		ˤ	barrels for ordnance	29
C21D   9/14		פޤѰѥ	wear-resistant or pressure-resistant pipes	511
C21D   9/16		礦	for explosive shells	116
C21D   9/18		ʥա礫ޡϤߡޤμưǹ	for knives, scythes, scissors, or like hand cutting tools	763
C21D   9/20		Ȥο	for blades for skates	31
C21D   9/22		ɥѡߡ󥰥åѡں﹩	for drills; for milling cutters; for machine cutting tools	1817
C21D   9/24		Τ	for saw blades	843
C21D   9/26		ѡۡʥɥ󥰡ˤλ	for needles; for teeth for card-clothing	217
C21D   9/28		̥ե	for plain shafts	3336
C21D   9/30		󥯥եѡॷե	for crankshafts; for camshafts	2160
C21D   9/32		ѡ֤ޤϤह	for gear wheels, worm wheels, or the like	4772
C21D   9/34		ѡ	for tyres; for rims	1454
C21D   9/36		ܡѡ	for balls; for rollers	2133
C21D   9/38			for roll bodies	2395
C21D   9/40		ѡ졼	for rings; for bearing races	6034
C21D   9/42			for armour plate	195
C21D   9/44		ۻΩ饤˥󥰤Τѡ㡥ȡ󥰤ޤϻ	for equipment for lining mine shafts, e.g. segments, rings or props	37
C21D   9/46		°	for sheet metals	20011
C21D   9/48		ʤĺ	deep-drawing sheets	2704
C21D   9/50		ܷѼ	for welded joints	4703
C21D   9/52		ѡȥå	for wires; for strips	12230
C21D   9/54		ȥåפޤǮϧ	Furnaces for treating strips or wire	2595
C21D   9/56		ȥåפޤǮϢ³ϧ	Continuous furnaces for strip or wire	8984
C21D   9/567		ήưǲǮΡΣ	with heating in fluidised beds	146
C21D   9/573		ѤΡΣ	with cooling	4019
C21D   9/58		ˤǮˤ	with heating by baths	221
C21D   9/60		ͶƳǮˤ	with induction heating	1019
C21D   9/62		ľ񹳲Ǯˤ	with direct resistance heating	989
C21D   9/63		ȥåפΥåǻٻΡΣ	the strip being supported by a cushion of gas	509
C21D   9/64		ѥƥϧ	Patenting furnaces	228
C21D   9/66		ϧ	Tower-type furnaces	128
C21D   9/663		٥뷿ϧΣ	Bell-type furnaces	1307
C21D   9/665		Сƥåɤޤϥɡե󥰤줿ΡΣ	inverted or side-facing	22
C21D   9/667		ޥơϧΣ	Multi-station furnaces	86
C21D   9/67		ޤüʷϵʪΤŬ礷ΡΣ	adapted for treating the charge in vacuum or special atmosphere	206
C21D   9/673		°񡤤ޤϥ٥뷿ϧäεΣ	Details, accessories, or equipment peculiar to bell-type furnaces	1321
C21D   9/675		ޤӽ֤Σ	Arrangements of charging or discharging devices	100
C21D   9/677		Ǯ֤Σ	Arrangements of heating devices	156
C21D   9/68		ϧ°봬赡Ǯִ赡ִ赡£ã	Furnace coilers; Hot coilers(cold coilers <b>B21C47/00</b>)	648
C21D   9/70		󥴥åѤϧʤǮϧ	Furnaces for ingots, i.e. soaking pits	3004
C21D  10/00		ǮޤϲùʳˡˤʪŪβɡΣ	Modifying the physical properties by methods other than heat treatment or deformation	3521
C21D  11/00		ǮΥץޤĴΣ	Process control or regulation for heat treatments	15738
