Magnesium Alloy EZ33-T5
Temper · default condition
ASTM EZ33 · EN MC65120, MgRE3Zn2Zr
T5 = 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.
Values for the T5 condition
Other EZ33 tempers and conditions
EZ33 is listed in 2 conditions; see the grade overview at EZ33.
- F
- T5
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 |
T5DefaultThis page 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-T5?
EZ33-T5 is EZ33 in the T5 temper — standard supplied condition for EZ33A sand and investment castings; best combination of creep resistance, pressure tightness and dimensional stability to 250 °C. EZ33-T5 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). EZ33-T5 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).
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-T5 properties
Typical room-temperature values for EZ33-T5; 11 are specific to this condition. Other listed values are EZ33 reference data and may not represent this condition. Bars are the position among magnesium alloy grades.
Physical3
EZ33-T5 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-T5 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-T5 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-T5 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-T5 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-T5'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. Confirm any required mill or lot documentation when quoting.
Working with EZ33-T5
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.
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.
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 | — |
EZ33-T5 — frequently asked
What is EZ33-T5 used for?
EZ33-T5 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-T5?
EZ33-T5 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-T5 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-T5 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-T5?
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-T5 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-T5?
EZ33-T5 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.