Magnesium Alloy AZ92A
ASTM AZ92A · UNS M11920
AZ92A is a higher-aluminum Mg-Al-Zn sand-casting alloy (UNS M11920) supplied in F, T4, T5, T6 and T61 conditions, and it is also the standard filler alloy for magnesium repair welding.
Reference datasheet — AZ92A 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 T6 condition
AZ92A tempers and conditions
AZ92A is supplied in 5 conditions, soft to hard. T6 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost as-cast condition for lightly stressed, dimensionally stable parts; low ductility. | 97 | 172 | 2 | 65 HB | 73 W/m·K |
Solution heat treated and naturally aged | Choose when maximum ductility, toughness and shock resistance are needed from an AZ92A casting. | 97 | 275 | 10 | 63 HB | 63 W/m·K |
Cooled from hot working and artificially aged | Cheap stabilising age straight from the mould: slightly higher yield and hardness than F, minimal distortion, but very low elongation. | 103 | 172 | 1 | 69 HB | 75 W/m·K |
T6Default Solution heat treated and artificially aged | Standard high-strength condition: best combination of yield strength, hardness and pressure tightness for structural AZ92A castings. | 145 | 275 | 3 | 84 HB | 72 W/m·K |
T6 variant, underaged | Quench-assisted T6 variant used when a faster ageing cycle and slightly higher hardness are required on thick sand castings. | 150 | 275 | 2 | 84 HB | 11.5 % IACS |
What is AZ92A?
AZ92A is a higher-aluminum Mg-Al-Zn sand-casting alloy (UNS M11920) supplied in F, T4, T5, T6 and T61 conditions, and it is also the standard filler alloy for magnesium repair welding. It offers more strength, hardness and pressure tightness than AZ91: 145 MPa yield, 275 MPa tensile, 3% elongation and 84 HB, with 72 W/m·K conductivity and service to 150 °C. Machinability is the highest in the family at a score of 97. Elongation and weldability (score 55) are lower than AZ91E, high solidification shrinkage demands heavy risering, and all surfaces need conversion coating plus paint. AZ92A has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F). AZ92A has a yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 45 GPa (6.53 Msi).
What is AZ92A used for?
- Pressure-tight sand castings
- Industrial gearbox and pump housings
- Filler rod for AZ91 and AZ63 weld repair
- Permanent-mold machine components
- Plaster-cast tooling and prototype hardware
- Load-bearing equipment brackets
Limitations
- Low electrical conductivity — 11.5 % IACS, worse than 92% of magnesium alloy grades
- Limited ductility — 3%, worse than 85% of magnesium alloy grades
AZ92A properties
Typical room-temperature values for AZ92A-T6; bars are the position among magnesium alloy grades.
Physical3
AZ92A has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F).
Mechanical13
AZ92A has a yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AZ92A is rated for continuous service to 150°C (302 °F). It conducts heat at 72 W/m·K (41.6 BTU/hr·ft·°F), worse than 69% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
AZ92A conducts electricity at 11.5 % IACS, worse than 92% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), worse than 57% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AZ92A takes about 350 MJ of energy and emits 30 kg of CO₂ — more than 74% of magnesium alloy grades. Typical recycled content is 25%.
Manufacturability8
AZ92A's machinability is excellent (97/100, better than 92% of magnesium alloy grades); weldability good (55/100); formability not recommended (10/100).
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. AZ92A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AZ92A
Is AZ92A easy to machine?
Outstanding machinability at high speed with sharp positive-rake tools and light or no coolant — but fine chips/dust are a fire hazard, keep dry (never water-based mist), collect chips in covered steel bins and have Class D extinguisher on hand.
Can AZ92A be welded?
GTAW/GMAW in argon with AZ92A filler (also the standard filler for AZ91/AZ63 repairs); preheat thick sections, avoid restraint to prevent hot cracking and stress-relieve or re-age after welding.
Can AZ92A be formed, bent or molded?
A casting alloy only — sand, permanent-mould and plaster casting with good fluidity and pressure tightness; use SF6-free cover gas (SO₂/HFC-134a), generous risering because of high solidification shrinkage; not cold formable.
AZ92A 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 |
|---|---|---|
| Al | 8.3 – 9.7 | 9 |
| Zn | 1.6 – 2.4 | 2 |
| Mn0.10 % min required for corrosion control | 0.1 – 0.35 | 0.15 |
| Si | ≤ 0.3 | |
| Cu | ≤ 0.25 | |
| Ni | ≤ 0.01 | |
| Fehigh-purity limit; older specs allow more | ≤ 0.01 | |
| Others (each)total 0.30 % max | ≤ 0.1 | |
| Mg | balance |
What surface finishes work on AZ92A?
Not sulphuric-anodizable: apply chromate/chrome-free conversion coat, Dow 17/HAE or PEO anodic coating, then epoxy primer and topcoat; electrically isolate from steel, aluminium and copper fasteners to prevent galvanic attack.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AZ92A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M11920
How much does AZ92A cost?
AZ92A 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.
AZ92A — frequently asked
What is AZ92A used for?
AZ92A is typically used for pressure-tight sand castings, industrial gearbox and pump housings, filler rod for AZ91 and AZ63 weld repair, permanent-mold machine components, plaster-cast tooling and prototype hardware and load-bearing equipment brackets. In short: hardest AZ-series casting alloy; pressure-tight sand castings; standard magnesium filler alloy.
What is the yield strength of AZ92A?
AZ92A has a typical yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Strength varies by condition: see the 5 listed tempers.
Is AZ92A easy to machine?
Yes — machinability is rated excellent (97/100, better than 92% of magnesium alloy grades). Outstanding machinability at high speed with sharp positive-rake tools and light or no coolant — but fine chips/dust are a fire hazard, keep dry (never water-based mist), collect chips in covered steel bins and have Class D extinguisher on hand.
Can AZ92A be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW in argon with AZ92A filler (also the standard filler for AZ91/AZ63 repairs); preheat thick sections, avoid restraint to prevent hot cracking and stress-relieve or re-age after welding.
What surface finishes work on AZ92A?
Not sulphuric-anodizable: apply chromate/chrome-free conversion coat, Dow 17/HAE or PEO anodic coating, then epoxy primer and topcoat; electrically isolate from steel, aluminium and copper fasteners to prevent galvanic attack.
Can AZ92A be formed, bent or molded?
A casting alloy only — sand, permanent-mould and plaster casting with good fluidity and pressure tightness; use SF6-free cover gas (SO₂/HFC-134a), generous risering because of high solidification shrinkage; not cold formable.
What is the maximum service temperature of AZ92A?
AZ92A 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 AZ92A-T6 and AZ92A-F?
T6 is the default condition — standard high-strength condition: best combination of yield strength, hardness and pressure tightness for structural AZ92A castings. F: lowest-cost as-cast condition for lightly stressed, dimensionally stable parts; low ductility. Yield strength is 145 MPa in T6 versus 97 MPa in F.
How much does AZ92A cost?
AZ92A 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
- ASTM B80 — Magnesium-Alloy Sand Castings — ASTM International (2015)
- ASTM B199 — Magnesium-Alloy Permanent Mold Castings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASTM D1732 — Preparation of Magnesium Alloy Surfaces for Painting — ASTM International (2019)
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.