Lightweight MG · Mg-Al-Zn Wrought
Magnesium Alloy AZ31B
Magnesium Alloy AZ31B is a lightweight mg magnesium alloy — standard wrought magnesium. Typical values: 150 MPa yield, 1.78 g/cm³, rated to 150 °C. Available for CNC machining, Sheet metal at FabDigit.
Properties
Typical room-temperature values in the O (annealed) condition. Metric first, imperial in gray. The bars show where AZ31B sits against the other 12 magnesium alloy grades in the catalog.
Datasheet
| Yield strength | 150 MPa22 ksi |
|---|---|
| Tensile strength | 260 MPa38 ksi |
| Hardness | 49 HB |
| Density | 1.78 g/cm³0.064 lb/in³ |
| Specific strength (yield ÷ density) | 84 |
| Min service temp | -100 °C-148 °F |
| Max service temp | 150 °C302 °F |
| Electrical conductivity | 15 % IACS8.7 MS/m |
| Machinability | Excellent92 / 100 |
| Weldability | Very good75 / 100 |
| Formability | Fair40 / 100 |
| ISO 513 machining group | N |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other magnesium alloy grades
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. AZ31B is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to AZ31B. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Excellent92 / 100 |
|---|---|
| ISO material group | N.7 |
| Cutting speed (rough / finish) | 400 / 460 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1.5 mm |
| Drill depth limit | 8× diameter |
| Best surface (machined / polished) | Ra 0.8 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair40 / 100 |
|---|---|
| Weldability | Better75 / 100 |
| Bendable | Yes |
Conditions and tempers
How AZ31B is supplied and what each state is for. The default is what FabDigit quotes unless your drawing says otherwise.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
ODefault Annealed (O) | Softest — parts you will bend or deep-form; not for carrying load | — | — | — | — |
H24 Strain hardened, partially annealed (H24) | Bend + stiffness balance — general sheet-metal work | — | — | — | — |
F As fabricated (F) | No guaranteed properties — spacers, jigs, parts where strength is irrelevant | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on AZ31B, ranked by how often they make sense for this grade.
Heat treatment
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
|---|---|
| Stress Relief | Reduce residual stress without changing structure |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| CMM Inspection | Inspection |
| FAI Report | Inspection |
| Individual Bag | Packaging |
Surface finishes for AZ31B
Coatings and treatments compatible with magnesium alloy on the processes AZ31B runs on. Pick them in the quote configurator or call them out on the drawing.
Conversion Coating
- Anodizing Type II
- Chem Film (Alodine)
- Hard Anodize Type III w/ PTFE
- Hard Anodizing Type III
Organic Coating
- E-Coating
- Painting
- Powder Coating
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Embossing / Debossing
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Steel Stamping
- Vibro Engraving / Scribing
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AZ31B in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M11311
- ASTM
- B107
Stock forms
Raw-material forms FabDigit sources AZ31B in.
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.