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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.
| 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 | Cp=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 | Compressive
yield strength |
|||||
|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation in
50 mm (2 in.) |
Brinell
500 kg load, 10 mm ball |
|||||
| KSI | MPa | KSI | MPa | % | KSI | MPa | ||
| Extruded
hollow shapes and tubing |
35 | 241 | 24 | 165 | 16 | 46 | 12 | 83 |
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