Magnesium Alloy MgMn2
UNS M15100 · ASTM M1A
MgMn2 is a low-alloy wrought magnesium-manganese alloy standardized under ISO, essentially the international counterpart to ASTM M1A (UNS M15100).
Reference datasheet — MgMn2 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the F condition
MgMn2 tempers and conditions
MgMn2 is supplied in 4 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum warm formability and for parts that will be extensively welded or deep-drawn at 250–350 °C. | 105 | 220 | 15 | 40 HB | 34 % IACS |
as-forged bar stock and die forgings | For press forgings and hand forgings where uniform fine grain and weld repairability are required. | 160 | 250 | 10 | 47 HB | 33 % IACS |
FDefault As fabricated | Standard stocked condition for M1A/MgMn2 extrusions — best combination of weldability, corrosion behaviour and moderate strength. | 180 | 255 | 12 | 44 HB | — |
Strain hardened and partially annealed, half hard | Use where flat sheet stiffness and higher yield strength matter more than forming ductility. | 180 | 250 | 6 | 48 HB | 33 % IACS |
What is MgMn2?
MgMn2 is a low-alloy wrought magnesium-manganese alloy standardized under ISO, essentially the international counterpart to ASTM M1A (UNS M15100). With no aluminium or zinc it is chosen for corrosion resistance and weldability (weldability score 88) rather than strength, and is supplied in F, O, H24 and forged conditions with 180 MPa yield, 255 MPa tensile, 12 % elongation and 44 HB. Service temperature is limited to about 150 C and formability is poor (score 28), so most shaping is done hot. AZ31B is the usual alternative where higher strength matters more than weld behaviour. MgMn2 has a density of 1.76 g/cm³ (0.0636 lb/in³), lighter than 94% of magnesium alloy grades. It melts at 648°C (1,198 °F). MgMn2 has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 75% of magnesium alloy grades. Elongation at break is 12% and the elastic modulus is 45 GPa (6.53 Msi).
What is MgMn2 used for?
- corrosion-resistant sheet and tube
- lightly loaded structural parts
- welded assemblies
Advantages
- Conducts heat well — 138 W/m·K (79.7 BTU/hr·ft·°F), better than 98% of magnesium alloy grades
- High electrical conductivity — 33 % IACS, better than 97% of magnesium alloy grades
- Readily welded — 88/100, better than 96% of magnesium alloy grades
- Forms and bends easily — 28/100, better than 79% of magnesium alloy grades
- High strength — 180 MPa (26.1 ksi), better than 75% of magnesium alloy grades
MgMn2 properties
Typical room-temperature values for MgMn2-F; bars are the position among magnesium alloy grades.
Physical3
MgMn2 has a density of 1.76 g/cm³ (0.0636 lb/in³), lighter than 94% of magnesium alloy grades. It melts at 648°C (1,198 °F).
Mechanical13
MgMn2 has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 75% of magnesium alloy grades. Elongation at break is 12% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
MgMn2 is rated for continuous service to 150°C (302 °F). It conducts heat at 138 W/m·K (79.7 BTU/hr·ft·°F), better than 98% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
MgMn2 conducts electricity at 33 % IACS, better than 97% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 88% of magnesium alloy grades.
Sustainability4
Producing a kilogram of MgMn2 takes about 340 MJ of energy and emits 27 kg of CO₂ — more than 59% of magnesium alloy grades. Typical recycled content is 20%.
Manufacturability7
MgMn2's machinability is excellent (96/100, better than 87% of magnesium alloy grades); weldability excellent (88/100); formability poor (28/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. MgMn2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with MgMn2
Is MgMn2 easy to machine?
Machines faster than any other structural metal — use sharp, high-rake, well-polished tools, generous chip clearance, no water-based coolant on fine chips, and keep a class-D extinguisher and swarf management plan for fire risk.
Can MgMn2 be welded?
Excellent for GTAW/GMAW with argon or Ar-He and EZ33A/M1A-type filler; the absence of Al and Zn means no post-weld stress-relief cracking, so it is the go-to grade for welded magnesium assemblies (light stress relief ~260 °C only for tight tolerances).
Can MgMn2 be formed, bent or molded?
Cold forming is very limited by the HCP structure; bend, draw and stretch at 230–350 °C with heated tooling, and use generous bend radii (≥5t cold, ≈2t hot).
MgMn2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mnprincipal alloying element; ties up Fe as harmless intermetallics | 1.2 – 2 | 1.5 |
| Alimpurity limit | ≤ 0.3 | |
| Znimpurity limit | ≤ 0.3 | |
| Si | ≤ 0.1 | |
| Cukept low for corrosion resistance | ≤ 0.05 | |
| Nikept low for corrosion resistance | ≤ 0.01 | |
| Fecontrolled by Mn addition | ≤ 0.03 | |
| Ca | ≤ 0.3 | |
| Others (each)total 0.30 max | ≤ 0.05 | |
| Mg | balance |
What surface finishes work on MgMn2?
Never leave bare in service — apply chromate-free conversion coating, Dow 17/HAE anodic or PEO coating plus epoxy primer, and insulate all steel/aluminium fasteners with washers or sealant to prevent galvanic corrosion.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy MgMn2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M15100
- ASTM
- M1A
How much does MgMn2 cost?
MgMn2 is a premium-cost magnesium alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
MgMn2 — frequently asked
What is MgMn2 used for?
MgMn2 is typically used for corrosion-resistant sheet and tube, lightly loaded structural parts and welded assemblies. In short: best-welding wrought magnesium; aluminium-free, low-strength grade; fastest-machining structural metal.
What is the yield strength of MgMn2?
MgMn2 has a typical yield strength of 180 MPa (26.1 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 75% of magnesium alloy grades. Strength varies by condition: see the 4 listed tempers.
Is MgMn2 easy to machine?
Yes — machinability is rated excellent (96/100, better than 87% of magnesium alloy grades). Machines faster than any other structural metal — use sharp, high-rake, well-polished tools, generous chip clearance, no water-based coolant on fine chips, and keep a class-D extinguisher and swarf management plan for fire risk.
Can MgMn2 be welded?
Yes — weldability is rated excellent (88/100). Excellent for GTAW/GMAW with argon or Ar-He and EZ33A/M1A-type filler; the absence of Al and Zn means no post-weld stress-relief cracking, so it is the go-to grade for welded magnesium assemblies (light stress relief ~260 °C only for tight tolerances).
What surface finishes work on MgMn2?
Never leave bare in service — apply chromate-free conversion coating, Dow 17/HAE anodic or PEO coating plus epoxy primer, and insulate all steel/aluminium fasteners with washers or sealant to prevent galvanic corrosion.
Can MgMn2 be formed, bent or molded?
Cold forming is very limited by the HCP structure; bend, draw and stretch at 230–350 °C with heated tooling, and use generous bend radii (≥5t cold, ≈2t hot).
What is the maximum service temperature of MgMn2?
MgMn2 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between MgMn2-F and MgMn2-O?
F is the default condition — standard stocked condition for M1A/MgMn2 extrusions — best combination of weldability, corrosion behaviour and moderate strength. O: pick for maximum warm formability and for parts that will be extensively welded or deep-drawn at 250–350 °C. Yield strength is 180 MPa in F versus 105 MPa in O.
How much does MgMn2 cost?
MgMn2 is a premium-cost magnesium alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ISO 3116 — Magnesium and magnesium alloys — Wrought magnesium alloys — ISO (2019)
- ASTM B107/B107M — Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes and Wire — ASTM International (2021)
- ASTM B91 — Magnesium-Alloy Forgings — ASTM International (2017)
- ASTM B275 — Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Magnesium alloys) — ASM International (1990)
- ASM Specialty Handbook — Magnesium and Magnesium Alloys — ASM International (1999)
- ASM Handbook Vol. 13B — Corrosion: Materials (Corrosion of Magnesium and Magnesium Alloys) — ASM International (2005)
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.