| ReturnTo Theme-Group-Choice | Onelevelup |
| 4K042 | HEAT TREATMENT OF ARTICLES | |
| C21D9/00 -9/44;9/50-9/50,102@Z | ||
| C21D9/00-9/00@Z;9/02-9/44;9/50-9/50,102@Z | AA | AA00 KIND OF HEAT-TREATED ARTICLE |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA07 | AA08 | AA09 | AA10 |
| . Springs | . . Wound springs including spiral springs | . . Plate springs | . Rails | . . in special shapes | . Tubes | . . with different diameters | . . Multilayered tubes | . . Bent tubes | . Cutlery e.g. knives sickles or scissors | |||
| AA11 | AA12 | AA13 | AA14 | AA15 | AA16 | AA17 | AA18 | AA19 | AA20 | |||
| . . Razors | . Cutting tools e.g. drills or milling cutters | . Saws | . Axes including rods or shafts | . . with different diameters | . . Crankshafts | . . Camshafts | . Gears | . Racks | . Rolls including rollers or sleeves | |||
| AA21 | AA22 | AA23 | AA24 | AA25 | AA26 | |||||||
| . . Composite rolls | . Bearings | . Rings including cylindrical bodies | . with welded areas | . Others | . Clad materials | |||||||
| BA | BA00 PURPOSE OR EFFECT |
BA01 | BA02 | BA03 | BA04 | BA05 | BA06 | BA07 | BA08 | BA09 | BA10 | |
| . Strength including collapse strength or crushing strength | . Toughness or brittleness resistance including impact fracture resistance | . Wear resistance including hardness | . Fatigue resistance | . Workability including cutting works | . Corrosion resistance | . . against stress corrosion | . Hydrogen resistance | . Residual stress | . Prevention of warps or bends including uniform treatments | |||
| BA11 | BA12 | BA13 | BA14 | |||||||||
| . Weldability | . Electricity or magnetism including nonmagnetism | . Efficiency workability or economy | . Others | |||||||||
| CA | CA00 ALLOY COMPONENT OR KIND OF STEEL |
CA01 | CA02 | CA03 | CA04 | CA05 | CA06 | CA07 | CA08 | CA09 | CA10 | |
| . Defined alloy components | . . Boron | . . Calcium | . . Cobalt | . . Copper | . . Chromium of less than 5% | . . Chromium of 5% or more | . . Molybdenum | . . Niobium | . . Nickel of less than 5% | |||
| CA11 | CA12 | CA13 | CA14 | CA15 | CA16 | CA17 | ||||||
| . . Nickel of 5% or more | . . Titanium | . . Vanadium | . . Rare earth metals i.e. REM | . Defined kinds of steel | . . Stainless steel | . . Cast iron | ||||||
| DA | DA00 KIND OF HEAT TREATMENT |
DA01 | DA02 | DA03 | DA04 | DA05 | DA06 | DA07 | ||||
| . Quenching | . Tempering | . Annealing | . Normalising i.e. drawing of temper | . Aging | . Others | . . Remelting | ||||||
| DB | DB00 MEANS FOR HEATING |
DB01 | DB02 | DB03 | DB04 | DB05 | DB06 | DB07 | DB08 | |||
| . Electromagnetic induction | . Direct power distribution | . Arc discharge | . Lasers | . Electron beams | . Burners | . Furnaces | . Others | |||||
| DC | DC00 HEATING CONDITION |
DC01 | DC02 | DC03 | DC04 | DC05 | ||||||
| . Heating speed | . Heating temperature | . Maintaining time | . Atmosphere | . Others | ||||||||
| DD | DD00 MEANS FOR COOLING |
DD01 | DD02 | DD03 | DD04 | DD05 | DD06 | |||||
| . Solids | . Liquids | . . Immersion | . . Sprays | . Gases | . Others | |||||||
| DE | DE00 COOLING CONDITION |
DE01 | DE02 | DE03 | DE04 | DE05 | DE06 | DE07 | ||||
| . Cooling speed | . . Rapid cooling | . . Radiation or air cooling | . . Annealing or furnace cooling | . . defined by numerical values or algorithms | . Cooling temperature zones | . Others | ||||||
| DF | DF00 TRANSFER OR ROTATION OF ARTICLES DURING PROCESSING |
DF01 | DF02 | |||||||||
| . Transferring articles | . Rotating articles | |||||||||||
| EA | EA00 DEVICE OR CONTROL |
EA01 | EA02 | EA03 | ||||||||
| . Devices | . with measurement or control | . . Heating control |