HM21A

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America MIL HM21A Magnesium alloy sheet and plate (hm21a) and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: HM21A / HM21A

Category	Grade	Standard	Region/Area	Standard Content
Metals	HM21A	MIL M 8917A	America	Magnesium alloy sheet and plate (hm21a)

Chemical composition(mass fraction)(wt.%) of the HM21A

Element	Min	Max	Similar
Th	1.5000	2.5000	-
Mn	0.4500	1.1000	-
Mg	-	-	-
Others each	-	0.1000	-
Others total	-	0.3000	-

Mechanical Properties of steel grade HM21A

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)
932 (≥)	817 (≥)	31	42	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	411

Physical Properties of steel grade HM21A

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	-	-			0.31	-
445	615	-	24.3	341		-
823	-	43	21.2			443	414

Heat Treatment of steel grade HM21A

Heat treated : 1134°C - 1523°C

Technological Curves of steel grade HM21A

No Curve

Cross Reference Table (Equivalent Grade) of HM21A

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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