Magnesium Alloy AZ31B

General Characteristics
The AZ31B Certainly the most widely available of the magnesium grades, AZ31B is produced in a wide variety of shapes from sheet and plate through bar forms. It is commonly used as an alternative to aluminum alloys due to its high strength to weight ratio. Care must be taken in machining the grade, however, because the chips and powder can be flammable. Typical uses include variety of aerospace applications and general commercial applications requiring good properties and high strength to weight ratio.
Typical Chemical Composition

Weight % Al Mn Zn Ca Si Cu Ni Fe Other Mg

minimum 2.50 0.20 0.60 — — — — — — Bal

maximum 3.50 — 1.40 0.04 0.10 0.05 0.005 0.005 0.30

Weight %	Al	Mn	Zn	Ca	Si	Cu	Ni	Fe	Other	Mg
minimum	2.50	0.20	0.60	—	—	—	—	—	—	Bal
maximum	3.50	—	1.40	0.04	0.10	0.05	0.005	0.005	0.30

Characteristics		English	Metric
Nominal density	25°C / 78°F	0.064 lbs/in³	1.77 g/cm³
Specific heat		C_p=0.2441+0.000105T-2783T²
Coefficient of thermal expansion	20°C / 68°F	14 micro in/in- °F	26 micro m/m- °K
Thermal conductivity	100-300°C (212-572°F)	56 BTU/ft- hr – °F	96 W/m – °K
Electrical resistivity	20°C / 68°F	92 nΩ · m
Electrical conductivity	20°C / 68°F	18.5 %IACS

Form	Tensile					Hardness	Shear strength
	Ultimate		Yield		Elongation in 50 mm (2 in.)	Brinell 500 kg load, 10 mm ball
	KSI	MPa	KSI	MPa	%		KSI	MPa
Sheet -annealed	37	255	22	150	21	56	21	145
Sheet – hard rolled	42	290	32	220	15	73	23	160