Magnesium Alloy MgMn2-H24
Temper
UNS M15100 · ASTM M1A
H24 = strain hardened and partially annealed, half hard
Use where flat sheet stiffness and higher yield strength matter more than forming ductility.
Values for the H24 condition
Other MgMn2 tempers and conditions
MgMn2 is listed in 4 conditions; see the grade overview at MgMn2.
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 | — |
H24This page 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-H24?
MgMn2-H24 is MgMn2 in the H24 temper — use where flat sheet stiffness and higher yield strength matter more than forming ductility. MgMn2-H24 has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 75% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi). MgMn2-H24 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). F is the default condition FabDigit quotes; H24 is available on request or by drawing note.
Advantages
- High electrical conductivity — 33 % IACS, better than 97% of magnesium alloy grades
- Conducts heat well — 136 W/m·K (78.6 BTU/hr·ft·°F), better than 96% of magnesium alloy grades
- Readily welded — 82/100, better than 94% of magnesium alloy grades
- High strength — 180 MPa (26.1 ksi), better than 75% of magnesium alloy grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 78% of magnesium alloy grades
MgMn2-H24 properties
Typical room-temperature values for MgMn2-H24; 20 are specific to this condition. Other listed values are MgMn2 reference data and may not represent this condition. Bars are the position among magnesium alloy grades.
Physical3
MgMn2-H24 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-H24 has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 75% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
MgMn2-H24 is rated for continuous service to 120°C (248 °F). It conducts heat at 136 W/m·K (78.6 BTU/hr·ft·°F), better than 96% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
MgMn2-H24 conducts electricity at 33 % IACS, better than 97% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (28/100), better than 78% of magnesium alloy grades.
Sustainability4
Producing a kilogram of MgMn2-H24 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-H24's machinability is excellent (96/100, better than 87% of magnesium alloy grades); weldability very good (82/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with MgMn2-H24
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).
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.
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 | — |
MgMn2-H24 — frequently asked
What is MgMn2-H24 used for?
MgMn2-H24 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-H24?
MgMn2-H24 has a typical yield strength of 180 MPa (26.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 75% of magnesium alloy grades. Strength varies by condition: see the 4 listed tempers.
Is MgMn2-H24 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-H24 be welded?
Yes — weldability is rated very good (82/100). 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-H24?
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-H24 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-H24?
MgMn2-H24 is rated for continuous use to about 120°C (248 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.