Magnesium HM21A-F Alloy (UNS M13210)

Aug 2 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties

Introduction

Magnesium alloys are designated using the ASTM and SAE system in which the first part indicates the two main alloying elements in the alloy and the second part represents their percentages.

The following datasheet gives an overview of magnesium HM21A-F alloy.

Chemical Composition

The following table shows the chemical composition of magnesium HM21A-F alloy.

Element Content (%)
Magnesium, Mg 97
Thorium, Th 1.5 - 2.5
Manganese, Mn 0.45 - 1.1

Physical Properties

The physical properties of magnesium HM21A-F alloy are given in the following table.

Properties Metric Imperial
Density 1.78 g/cm³ 0.0643 lb/in³
Melting point 605-650 °C 1120-1200 °F

Mechanical Properties

The mechanical properties of magnesium HM21A-F forgings alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 230 MPa 33400 psi
Yield strength (@strain 0.200 %) 140 MPa 20300 psi
Elongation at break 15% 15%
Poisson's ratio 0.35 0.35
Elastic modulus 45 GPa 6530 ksi
Shear modulus 17 GPa 2470 ksi

Thermal Properties

The thermal properties of magnesium HM21A-F alloy are highlighted in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 26.8 µm/m°C 14.9 µin/in°F
Thermal conductivity 135 W/mK 937 BTU in/hr.ft².°F

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