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Overview ZA alloys were initially developed for gravity casting. Their mechanical properties compete directly with bronze, cast iron and aluminum using sand, permanent mold and plaster mold casting methods. Beginning in the late 1950's and continuing into the 1970's, Noranda, New Jersey Zinc Co. Ltd., St. Joe Mineral Co. and ILZRO contributed to development of the ZA alloy group. Zinc and Aluminum are the major alloy constituents, along with other minor additions of magnesium and copper. The numbers associated with the name represent the amount of aluminum in the alloy (i.e. ZA8 has 8% aluminum). Distinguishing features of ZA alloys include high as-cast strength, excellent bearing properties, as well as low energy (melting) requirements. Eastern Alloys manufactures the entire ZA alloy group. There are many different gravity-casting processes such as permanent mold, graphite permanent mold, plaster, and sand. In general these processes are used for low to medium volume requirements, and also as a prototyping technique. Top Mechanical Properties     ZA-8 ZA-12 ZA-27   Sand Cast Perm Mold Sand Cast Perm Mold Sand Cast Sand Cast HT Ultimate Tensile Strength: psi x 103 (MPa) 38 (263) 32-37 (221-255) 40-46 (276-317) 45-50 (310-345) 58-64 (400-441) 45-47 (310-324) Yield Strength - 0.2% Offset: psi x 103 (MPa) 29 (200) 30 (206) 31 (214) 39 (269) 54 (372) 37 (255) Elongation: % in 2" 1-2 1-2 1-3 1-3 3-6 8-11 Shear Strength: psi x 103 (MPa) - 35 (241) 37 (255) - 42 (290) 33 (228) Hardness: Brinell 85 85-90 89-105 89-105 110-120 90-110 Impact Strength: ft-lb (J) 156 (20) - 193 (25) - 353 (47) 433 (58) Fatigue Strength Rotary Bend - 5x108 cycles: psi x 103 (MPa) - 7.5 (52) 15 (103) - 25 (172) 15 (103) Compressive Yield Strength 0.1% Offset: psi x 103 (MPa) 29 (199) 31 (214) 33(227) 34 (234) 48 (331) 37 (255) Modulus of Elasticity - psi x 106 (MPa x 103) 12.4 (85.5) 12.47 (85.5) 12.07 (82.7) 12.07 (82.7) 11.37 (77.9) 11.37 (77.9) Poisson's Ratio 0.29 0.29 0.30 0.30 0.32 0.32   Top Physical Properties     ZA-8 ZA-12 ZA-27   Sand Cast Perm Mold Sand Cast Perm Mold Sand Cast Sand Cast HT Density: lb/cu in (g/cm3) 0.227 (6.3) 0.227 (6.3) 0.218 (6.0) 0.218 (6.0) 0.181 (5.0) 0.181 (5.0) Melting Range: °F (°C) 707-759 (375-404) 707-759 (375-404) 710-810 (377-432) 710-810 (377-432) 708-903 (376-484) 708-903 (376-484) Electrical Conductivity: %IACS 27.7 27.7 28.3 28.3 29.7 29.7 Thermal Conductivity: BTU/ft/hr/°F (W/m/hr/°C) 66.3 (114.7) 66.3 (114.7) 67.1 (116.1) 67.1 (116.1) 72.5 (125.5) 72.5 (125.5) Coefficient of Thermal Expansion: 68-212°F µin/in/°F (100-200°C µm/mm/°C) 12.9 (23.3) 12.9 (23.3) 13.4 (24.2) 13.4 (24.2) 14.4 (26.0) 14.4 (26.0) Specific Heat: BTU/lb/°F (J/kg/°C) .104 (435) .104 (435) .107 (448) .107 (448) .125 (534) .125 (534) Pattern of Die Shrinkage: in/in 1/8 in/ft 5/32 in/ft 1/8 in/ft 5/32 in/ft 5/32 in/ft 5/32 in/ft Top Compositions   Chemical Specification (per ASTM) (% by Weight) ZA-8 ZA-12 ZA-27 Ingot Casting Ingot Casting Ingot Casting Al 8.2-8.8 8.0-8.8 10.8-11.5 10.5-11.5 25.5-28.0 25.0-28.0 Mg .020-.030 .015-.030 .020-.030 .015-.030 .012-.020 .010-.020 Cu 0.8-1.3 .8-1.3 0.5-1.2 0.5-1.2 2.0-2.5 2.0- 2.5 Fe (max) .065 .075 .065 .075 .072 .075 Pb (max) .005 .006 .005 .006 .005 .006 Cd (max) .005 .006 .005 .006 .005 .006 Sn (max) .002 .003 .002 .003 .002 .003 Ni (other)x10 - - - - - - Zn Bal. Bal. Bal. Bal. Bal. Bal. Color Code ASTM B908 Blue Orange Purple       Top   Shapes and Sizes   Products Shapes and Weights (lbs.) (click on a shape below for details)   Standard Ingots Standard Sow ZA-8 22 2,200 ZA-12 21 - ZA-27 17 - Top Eastern Alloys, Inc. is a member of the London Metal Exchange, or LME, ILZRO, Interzinc, NADCA, and DDC. Overview Mechanical Properties Physical Properties Compositions Shapes and Sizes   Print this page  Contact us: Henry Henning Dr. PO Box 317 Maybrook, NY 12543 Tel: (845) 427-2151 Fax: (845) 427-5185 More Contacts>
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