Magnesium Alloy EZ33A
ASTM EZ33A · UNS M12330
EZ33A is a zinc–rare-earth–zirconium magnesium casting alloy (UNS M12330) used mainly in the T5 temper.
Reference datasheet — EZ33A 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 T5 condition
EZ33A tempers and conditions
EZ33A is supplied in 3 conditions, soft to hard. T5 is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Rarely supplied; only for non-critical parts or before final ageing, since EZ33A gains most of its stable strength from the T5 age. | 85 | 140 | 4 | 45 HB | 23 % IACS |
T5Default Cooled from hot working and artificially aged | Standard supply condition for aerospace sand castings: ~2–5 h at 215–220 °C gives stable properties and creep resistance to 250 °C. | 110 | 160 | 3 | 50 HB | 100 W/m·K |
T5 | Same ageing cycle applied to permanent-mould or investment castings; finer structure gives slightly higher strength and ductility than sand cast. | 110 | 170 | 4 | 52 HB | 24.6 % IACS |
What is EZ33A?
EZ33A is a zinc–rare-earth–zirconium magnesium casting alloy (UNS M12330) used mainly in the T5 temper. It is chosen for pressure tightness and stable properties up to about 250 °C, and is supplied as sand, permanent-mould and investment castings with 110 MPa yield, 160 MPa tensile, 3 % elongation, 50 HB and 100 W/m·K thermal conductivity. Strength is modest and corrosion resistance requires coating and galvanic isolation, but machinability (95) and weldability (75) are high, making salvage welding routine. EQ21A is the nearest alternative when higher strength is needed. EZ33A has a density of 1.8 g/cm³ (0.065 lb/in³), lighter than 63% of magnesium alloy grades. It melts at 545°C (1,013 °F). EZ33A has a yield strength of 110 MPa (16 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 83% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 44 GPa (6.38 Msi).
What is EZ33A used for?
- aircraft engine casings
- gearbox housings
- pressure-tight castings for hydraulic components
Advantages
- High service temperature — 250°C (482 °F), better than 93% of magnesium alloy grades
- Readily welded — 75/100, better than 91% of magnesium alloy grades
Limitations
- Low fracture toughness — 12 MPa·√m (10.9 ksi·√in), worse than 92% of magnesium alloy grades
- Limited ductility — 3%, worse than 85% of magnesium alloy grades
- Low strength — 110 MPa (16 ksi), worse than 83% of magnesium alloy grades
EZ33A properties
Typical room-temperature values for EZ33A-T5; bars are the position among magnesium alloy grades.
Physical3
EZ33A has a density of 1.8 g/cm³ (0.065 lb/in³), lighter than 63% of magnesium alloy grades. It melts at 545°C (1,013 °F).
Mechanical12
EZ33A has a yield strength of 110 MPa (16 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 83% of magnesium alloy grades. Elongation at break is 3% and the elastic modulus is 44 GPa (6.38 Msi).
Thermal6
EZ33A is rated for continuous service to 250°C (482 °F). It conducts heat at 100 W/m·K (57.8 BTU/hr·ft·°F), better than 57% of magnesium alloy grades. Thermal expansion is 26.1 µm/m·K (14.5 µin/in·°F).
Electrical3
EZ33A conducts electricity at 24.6 % IACS, better than 61% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (28/100), better than 78% of magnesium alloy grades.
Sustainability4
Producing a kilogram of EZ33A takes about 350 MJ of energy and emits 30 kg of CO₂ — more than 74% of magnesium alloy grades. Typical recycled content is 10%.
Manufacturability8
EZ33A's machinability is excellent (95/100, better than 54% of magnesium alloy grades); weldability very good (75/100); 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. EZ33A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EZ33A
Is EZ33A easy to machine?
Machines extremely fast with sharp, high-rake tools and generous chip clearance; use dry or mineral-oil cutting (never water-based) and manage fine chips/dust as a fire hazard.
Can EZ33A be welded?
Readily GTAW-welded with matching EZ33A filler in argon; pre-clean thoroughly and re-age at ~215 °C after welding to restore local properties — commonly used for casting salvage.
Can EZ33A be formed, bent or molded?
Sand, permanent-mould and investment casting only; excellent fluidity and low microporosity give pressure-tight thin-wall parts, but SF6-free protective cover gas or flux and Zr grain refinement control are essential.
EZ33A 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 |
|---|---|---|
| Zn | 2 – 3.1 | 2.6 |
| RErare-earth (didymium/mischmetal, Ce-rich) | 2.5 – 4 | 3.2 |
| Zrgrain refiner | 0.5 – 1 | 0.7 |
| Cuimpurity limit | ≤ 0.1 | |
| Niimpurity limit | ≤ 0.01 | |
| Others (each)total 0.30 max | ≤ 0.1 | |
| Mg | balance |
What surface finishes work on EZ33A?
Chromate/fluoride conversion coat or HAE/Dow 17/Tagnite anodic coating followed by epoxy primer and topcoat; isolate from steel and CFRP fasteners to avoid galvanic corrosion.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy EZ33A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M12330
- ASTM
- EZ33A-T5
How much does EZ33A cost?
EZ33A is a high-cost magnesium alloy ($$$$), pricier than about 78% 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.
EZ33A — frequently asked
What is EZ33A used for?
EZ33A is typically used for aircraft engine casings, gearbox housings and pressure-tight castings for hydraulic components. In short: pressure-tight magnesium casting; stable to 250 °C; best weldability in family.
What is the yield strength of EZ33A?
EZ33A has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 83% of magnesium alloy grades. Strength varies by condition: see the 3 listed tempers.
Is EZ33A easy to machine?
Yes — machinability is rated excellent (95/100, better than 54% of magnesium alloy grades). Machines extremely fast with sharp, high-rake tools and generous chip clearance; use dry or mineral-oil cutting (never water-based) and manage fine chips/dust as a fire hazard.
Can EZ33A be welded?
Yes — weldability is rated very good (75/100). Readily GTAW-welded with matching EZ33A filler in argon; pre-clean thoroughly and re-age at ~215 °C after welding to restore local properties — commonly used for casting salvage.
What surface finishes work on EZ33A?
Chromate/fluoride conversion coat or HAE/Dow 17/Tagnite anodic coating followed by epoxy primer and topcoat; isolate from steel and CFRP fasteners to avoid galvanic corrosion.
Can EZ33A be formed, bent or molded?
Sand, permanent-mould and investment casting only; excellent fluidity and low microporosity give pressure-tight thin-wall parts, but SF6-free protective cover gas or flux and Zr grain refinement control are essential.
What is the maximum service temperature of EZ33A?
EZ33A is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EZ33A-T5 and EZ33A-F?
T5 is the default condition — standard supply condition for aerospace sand castings: ~2–5 h at 215–220 °C gives stable properties and creep resistance to 250 °C. F: rarely supplied; only for non-critical parts or before final ageing, since EZ33A gains most of its stable strength from the T5 age. Yield strength is 110 MPa in T5 versus 85 MPa in F.
How much does EZ33A cost?
EZ33A is a high-cost magnesium alloy ($$$$), pricier than about 78% 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)
- AMS 4442 — Magnesium Alloy Castings, EZ33A-T5 — SAE International (2018)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — 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.