15B21 RH

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America SAE 15B21RH Restricted hardenability bands for selected alloy steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 15B21RH / 15B21 RH

Category	Grade	Standard	Region/Area	Standard Content
Metals	15B21 RH	SAE J 1868	America	Restricted hardenability bands for selected alloy steels

Chemical composition(mass fraction)(wt.%) of the 15B21 RH

Element	Min	Max	Similar
Si	0.1500	0.3500	-
S	-	0.0400	-
P	-	0.0250	-
Ni	-	0.2500	-
Mo	-	0.0600	-
Mn	0.8000	1.1000	-
Cu	-	0.3500	-
Cr	-	0.2000	-
C	0.1700	0.2200	-
B	0.0005	0.0030	-

Mechanical Properties of steel grade 15B21 RH

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)
748 (≥)	621 (≥)	41	43	22	Solution and Aging, Annealing, Ausaging, Q+T,etc	222

Physical Properties of steel grade 15B21 RH

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
12	-	-			0.11	-
975	399	-	31.3	231		-
656	-	34	33.2			122	434

Heat Treatment of steel grade 15B21 RH

Heat treated : 1484°C - 1652°C

Technological Curves of steel grade 15B21 RH

No Curve

Cross Reference Table (Equivalent Grade) of 15B21 RH

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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