SMn 21

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Japan JIS SMn21 机械结构用锰钢和锰铬钢 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: SMn21 / SMn 21

Category	Grade	Standard	Region/Area	Standard Content
Metals	SMn 21	JIS G4106	Japan	机械结构用锰钢和锰铬钢

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

Element	Min	Max	Similar
Si	0.1500	0.3500	-
S	-	0.0300	-
P	-	0.0300	-
Ni	-	0.2500	-
Mn	1.2000	1.5000	-
Cr	-	0.3500	-
C	0.1700	0.2300	-

Mechanical Properties of steel grade SMn 21

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)
431 (≥)	294 (≥)	34	11	41	Solution and Aging, Annealing, Ausaging, Q+T,etc	243

Physical Properties of steel grade SMn 21

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
44	-	-			0.31	-
342	839	-	43.3	211		-
245	-	33	12.2			312	231

Heat Treatment of steel grade SMn 21

Heat treated : 1139°C - 1899°C

Technological Curves of steel grade SMn 21

No Curve

Cross Reference Table (Equivalent Grade) of SMn 21

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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