21 B 3

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France AFNOR NF 21B3 Case hardening steels - Technical delivery conditions and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 21B3 / 21 B 3

Category	Grade	Standard	Region/Area	Standard Content
Metals	21 B 3	NF A35-551	France	Case hardening steels - Technical delivery conditions

Chemical composition(mass fraction)(wt.%) of the 21 B 3

Element	Min	Max	Similar
Si	0.2000	0.3500	-
S	-	0.0350	-
P	-	0.0350	-
Mn	0.6000	0.9000	-
C	0.1800	0.2400	-
B	0.0008	-	-
Al	0.0200	-	-
Si	0.1000	0.4000	-
S	-	0.0250	-
P	-	0.0350	-
Mn	0.6000	0.9000	-
C	0.1800	0.2400	-
B	0.0008	0.0050	-

Mechanical Properties of steel grade 21 B 3

Yield R_p0.2 (MPa)	Tensile R_m (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
948 (≥)	562 (≥)	11	12	32	Solution and Aging, Annealing, Ausaging, Q+T,etc	224

Physical Properties of steel grade 21 B 3

Temperature (°C)	Modulus of elasticity (GPa)	Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and	Thermal conductivity (W/m·°C)	Specific thermal capacity (J/kg·°C)	Specific electrical resistivity (Ω mm²/m)	Density (kg/dm³)	Poisson’s coefficient, ν
34	-	-			0.14	-
252	659	-	11.3	222		-
849	-	31	34.2			144	144

Heat Treatment of steel grade 21 B 3

Heat treated : 1394°C - 1599°C

Technological Curves of steel grade 21 B 3

No Curve

Cross Reference Table (Equivalent Grade) of 21 B 3

Grade	Standard	Country	Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1

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