Magnesium Alloy EZ33
ASTM EZ33 · EN MC65120, MgRE3Zn2Zr
EZ33 is a rare-earth/zinc/zirconium magnesium sand and investment casting alloy (EZ33A, MgRE3Zn2Zr, MC65120), normally used in the T5 condition.
Reference datasheet — EZ33 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
EZ33 tempers and conditions
EZ33 is supplied in 2 conditions, soft to hard. T5 is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Untreated as-cast state, used for non-critical or low-stress parts and as the starting point before T5 ageing; slightly lower yield strength and less dimensional stability at temperature. | 90 | 145 | 3 | 45 HB | 25 % IACS |
T5Default Cooled from hot working and artificially aged | Standard supplied condition for EZ33A sand and investment castings; best combination of creep resistance, pressure tightness and dimensional stability to 250 °C. | 110 | 160 | 3 | 50 HB | — |
What is EZ33?
EZ33 is a rare-earth/zinc/zirconium magnesium sand and investment casting alloy (EZ33A, MgRE3Zn2Zr, MC65120), normally used in the T5 condition. It is specified for pressure-tight, creep-resistant castings that run hot, with service to about 250 °C, 110 MPa yield, 160 MPa tensile, 3% elongation and 50 HB, and it is among the most weldable magnesium casting alloys. Room-temperature strength is well below ZE41 and WE54, and bare corrosion resistance is very low, so a conversion or anodic coating plus primer is required. ZE41 is the alternative when ambient strength matters more than creep resistance. EZ33 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). EZ33 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 EZ33 used for?
- aircraft gearbox casings
- engine casings
- pressure-tight castings
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
- Hard to polish — 45/100, worse than 93% 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
EZ33 properties
Typical room-temperature values for EZ33-T5; bars are the position among magnesium alloy grades.
Physical3
EZ33 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).
Mechanical11
EZ33 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
EZ33 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
EZ33 conducts electricity at 25 % IACS, better than 69% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), worse than 77% of magnesium alloy grades.
Sustainability4
Producing a kilogram of EZ33 takes about 380 MJ of energy and emits 30 kg of CO₂ — more than 93% of magnesium alloy grades. Typical recycled content is 20%.
Manufacturability8
EZ33'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. EZ33 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EZ33
Is EZ33 easy to machine?
Machines very freely at high speed with sharp, high-rake tools; use dry or mineral-oil cutting (never water-based), keep chips coarse and store swarf in covered steel bins because fine dust is a fire hazard.
Can EZ33 be welded?
Readily GTAW/GMAW welded and weld-repaired with EZ33A filler; low hot-cracking tendency, re-age 5 h at 216 °C after repair to restore properties.
Can EZ33 be formed, bent or molded?
Sand and investment casting alloy with excellent fluidity and pressure tightness; requires SF6-free protective cover gas or flux, Zr-preserving melt practice and slow directional solidification for thin sections.
EZ33 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 earths as didymium/misch metal, cerium-rich | 2.5 – 4 | 3.2 |
| Zrgrain refiner | 0.5 – 1 | 0.7 |
| Cuimpurity limit | ≤ 0.1 | |
| Niimpurity limit | ≤ 0.01 | |
| Others (each)total others max 0.30 | ≤ 0.3 | |
| Mg | balance |
What surface finishes work on EZ33?
Not anodizable like aluminium — apply chromate/fluoride conversion or Dow 17/HAE anodic coating followed by epoxy primer and paint; insulate all steel and copper fasteners to avoid galvanic attack.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy EZ33 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- EZ33A
- EN / DIN / Werkstoff-Nr.
- MC65120MgRE3Zn2Zr
How much does EZ33 cost?
EZ33 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.
EZ33 — frequently asked
What is EZ33 used for?
EZ33 is typically used for aircraft gearbox casings, engine casings and pressure-tight castings. In short: creep resistance to 250 °C; most weldable Mg casting; excellent pressure tightness.
What is the yield strength of EZ33?
EZ33 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 2 listed tempers.
Is EZ33 easy to machine?
Yes — machinability is rated excellent (95/100, better than 54% of magnesium alloy grades). Machines very freely at high speed with sharp, high-rake tools; use dry or mineral-oil cutting (never water-based), keep chips coarse and store swarf in covered steel bins because fine dust is a fire hazard.
Can EZ33 be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW welded and weld-repaired with EZ33A filler; low hot-cracking tendency, re-age 5 h at 216 °C after repair to restore properties.
What surface finishes work on EZ33?
Not anodizable like aluminium — apply chromate/fluoride conversion or Dow 17/HAE anodic coating followed by epoxy primer and paint; insulate all steel and copper fasteners to avoid galvanic attack.
Can EZ33 be formed, bent or molded?
Sand and investment casting alloy with excellent fluidity and pressure tightness; requires SF6-free protective cover gas or flux, Zr-preserving melt practice and slow directional solidification for thin sections.
What is the maximum service temperature of EZ33?
EZ33 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 EZ33-T5 and EZ33-F?
T5 is the default condition — standard supplied condition for EZ33A sand and investment castings; best combination of creep resistance, pressure tightness and dimensional stability to 250 °C. F: untreated as-cast state, used for non-critical or low-stress parts and as the starting point before T5 ageing; slightly lower yield strength and less dimensional stability at temperature. Yield strength is 110 MPa in T5 versus 90 MPa in F.
How much does EZ33 cost?
EZ33 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 — Standard Specification for Magnesium-Alloy Sand Castings — ASTM International (2021)
- AMS 4442 — Magnesium Alloy Castings, EZ33A-T5 — SAE International (2018)
- ASM Handbook Vol.2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASM Handbook Vol.13B: Corrosion — 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.