Zinc ZA-27 (Zn-27Al-2Cu-0.015Mg), Sand Cast

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Zinc ZA-27 (Zn-27Al-2Cu-0.015Mg), Sand Cast
Categories:	Metal; Nonferrous Metal; Zinc Alloy
Material Notes:	Used in bearing applications. ZA-27 has a higher bearing load capacity than bronze bearing alloys, although its environment (both temperature and corrosive) is more limited.
Key Words:	Zinc Foundry Alloy; UNS Z35841 (Castings); UNS Z35840 (Ingot)
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Physical Properties	Metric	English	Comments

Density	5.02 g/cc	0.181 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	90	90	500 kg load; 10 mm hardened steel ball
Hardness, Knoop	143	143	Estimated from Brinell Value
Hardness, Rockwell A	45.5	45.5	Estimated from Brinell Value
Hardness, Rockwell B	72	72	Estimated from Brinell Value
Hardness, Vickers	129	129	Estimated from Brinell Value
Tensile Strength, Ultimate	420 MPa	60900 psi
Tensile Strength, Yield	365 MPa @Strain 0.2 %	52900 psi @Strain 0.2 %
Elongation at Break	4.5 %	4.5 %	in 5 cm
Modulus of Elasticity	77.9 GPa	11300 ksi
Compressive Strength	330 MPa	47900 psi	0.1% offset
Fatigue Strength	172 MPa @# of Cycles 5.00e+8	24900 psi @# of Cycles 5.00e+8	Reverse Bend
Fracture Toughness	23.7 MPa-m½	21.6 ksi-in½
Shear Strength	292 MPa	42400 psi
Charpy Impact, Unnotched	48.0 J @Thickness 6.35 mm	35.4 ft-lb @Thickness 0.250 in	square bar
Coefficient of Friction	0.030 - 0.070	0.030 - 0.070

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000580 ohm-cm	0.00000580 ohm-cm

Thermal Properties	Metric	English	Comments
Heat of Fusion	128 J/g	55.1 BTU/lb
CTE, linear	26.0 µm/m-°C @Temperature 20.0 - 200 °C	14.4 µin/in-°F @Temperature 68.0 - 392 °F
Specific Heat Capacity	0.525 J/g-°C	0.125 BTU/lb-°F
Thermal Conductivity	125 W/m-K	868 BTU-in/hr-ft²-°F
Melting Point	376 - 484 °C	709 - 903 °F
Solidus	376 °C	709 °F
Liquidus	484 °C	903 °F

Processing Properties	Metric	English	Comments
Casting Temperature	515 - 545 °C	959 - 1010 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	25 - 28 %	25 - 28 %	Addition, Casting
	25.5 - 28 %	25.5 - 28 %	Addition, Ingot form
Cadmium, Cd	<= 0.0050 %	<= 0.0050 %	Impurity, Ingot form
	<= 0.0060 %	<= 0.0060 %	Impurity, Casting
Copper, Cu	2.0 - 2.5 %	2.0 - 2.5 %	Addition, Casting
	2.0 - 2.5 %	2.0 - 2.5 %	Addition, Ingot form
Iron, Fe	<= 0.072 %	<= 0.072 %	Impurity, Ingot form
	<= 0.075 %	<= 0.075 %	Impurity, Casting
Lead, Pb	<= 0.0050 %	<= 0.0050 %	Impurity, Ingot form
	<= 0.0060 %	<= 0.0060 %	Impurity, Casting
Magnesium, Mg	0.010 - 0.020 %	0.010 - 0.020 %	Addition, Casting
	0.012 - 0.020 %	0.012 - 0.020 %	Addition, Ingot form
Tin, Sn	<= 0.0020 %	<= 0.0020 %	Impurity, Ingot form
	<= 0.0030 %	<= 0.0030 %	Impurity, Casting
Zinc, Zn	69.396 - 72.488 %	69.396 - 72.488 %	As balance; Ingot per ASTM B 669
	69.39 - 72.99 %	69.39 - 72.99 %	As balance; Castings per ASTM B 791

References for this datasheet.

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MZN27A / 14520

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