Aluminum QC-10 · temper
Aluminum QC-10-T7451
Properties of the T7451 condition, compared with the other QC-10 tempers.
Use this designation when the mould plate must be called out by an equivalent registered 7xxx temper; properties match the standard QC-10 supply condition.
What is QC-10-T7451?
QC-10-T7451 is QC-10 in the T7451 temper — use this designation when the mould plate must be called out by an equivalent registered 7xxx temper; properties match the standard QC-10 supply condition. QC-10-T7451 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 538 MPa (78 ksi) — stronger than 95% of aluminum grades. Elongation at break is 9% and the elastic modulus is 71.5 GPa (10.4 Msi). QC-10-T7451 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 95% of aluminum grades. It melts at 490°C (914 °F).
Advantages
- High strength — 483 MPa (70.1 ksi), better than 95% of aluminum grades
- Easy to machine — 85/100, better than 95% of aluminum grades
- Polishes to a fine finish — 80/100, better than 94% of aluminum grades
- Tough — resists crack growth — 34 MPa·√m (30.9 ksi·√in), better than 90% of aluminum grades
Limitations
- Difficult to weld — 20/100, worse than 89% of aluminum grades
QC-10-T7451 properties
Typical room-temperature values for QC-10-T7451 — 8 properties are specific to this condition; the rest are grade-level values shared by every QC-10 temper. Each bar shows where the value sits among the aluminum grades in FabDigit's library — further right is higher.
Physical3
QC-10-T7451 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 95% of aluminum grades. It melts at 490°C (914 °F).
Mechanical13
QC-10-T7451 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 538 MPa (78 ksi) — stronger than 95% of aluminum grades. Elongation at break is 9% and the elastic modulus is 71.5 GPa (10.4 Msi).
Thermal6
QC-10-T7451 is rated for continuous service to 150°C (302 °F). It conducts heat at 155 W/m·K (89.6 BTU/hr·ft·°F), better than 71% of aluminum grades. Thermal expansion is 23.5 µm/m·K (13.1 µin/in·°F).
Electrical3
QC-10-T7451 conducts electricity at 40 % IACS, better than 72% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of QC-10-T7451 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 75% of aluminum grades. Typical recycled content is 20%.
Manufacturability7
QC-10-T7451's machinability is excellent (85/100, better than 95% of aluminum grades); weldability poor (20/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other QC-10 tempers and conditions
QC-10 is also supplied in 1 other condition. The full side-by-side table is on the QC-10 overview.
- STDThe only commercially stocked condition: solution heat treated, stretch/stress-relieved and overaged thick plate ready for direct cavity machining.483 MPa yield · 165 HB
- T7451Use this designation when the mould plate must be called out by an equivalent registered 7xxx temper; properties match the standard QC-10 supply condition.483 MPa yield · 165 HB
Working with QC-10-T7451
Is QC-10 easy to machine?
Cuts 3–5× faster than P20 steel with polished-flute carbide, high rake and air/MQL or flood coolant; excellent for high-speed cavity roughing but watch chip evacuation in deep pockets.
Can QC-10 be welded?
Not arc weldable in the normal sense — repair by TIG with 7xxx/4043 filler loses local strength and hardness; prefer laser cladding, friction-stir or mechanical inserts.
Can QC-10 be formed, bent or molded?
Supplied only as stress-relieved thick plate for material removal; avoid cold forming and avoid re-solution treating, which destroys the flatness and residual-stress balance.
What surface finishes work on QC-10?
Hard (Type III) anodize, electroless nickel or PVD for wear and corrosion protection of cavities; can be polished to a fine mould finish but is easily dented, so plate protective coatings on high-wear faces.
QC-10 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 |
|---|---|---|
| Znproprietary chemistry, close to AA 7050 | 5.7 – 6.7 | 6.2 |
| Mg | 1.9 – 2.6 | 2.2 |
| Cu | 2 – 2.6 | 2.3 |
| Zrgrain-structure control | 0.08 – 0.15 | 0.11 |
| Fe | ≤ 0.15 | — |
| Si | ≤ 0.12 | — |
| Mn | ≤ 0.1 | — |
| Cr | ≤ 0.04 | — |
| Ti | ≤ 0.06 | — |
| Al | balance | — |
QC-10-T7451 — frequently asked
What is QC-10-T7451 used for?
QC-10-T7451 is typically used for plastic injection mould cavities and cores, blow moulds, prototype and bridge tooling, mould bases and frames, vacuum-forming and thermoforming tools and machining fixtures and jigs. In short: high-strength mold plate.
What is the yield strength of QC-10-T7451?
QC-10-T7451 has a typical yield strength of 483 MPa (70.1 ksi) and a tensile strength of 538 MPa (78 ksi) — stronger than 95% of aluminum grades. Strength varies by condition: see the 2 listed tempers.
Is QC-10-T7451 easy to machine?
Yes — machinability is rated excellent (85/100, better than 95% of aluminum grades). Cuts 3–5× faster than P20 steel with polished-flute carbide, high rake and air/MQL or flood coolant; excellent for high-speed cavity roughing but watch chip evacuation in deep pockets.
Can QC-10-T7451 be welded?
Not readily — weldability is rated poor (20/100). Not arc weldable in the normal sense — repair by TIG with 7xxx/4043 filler loses local strength and hardness; prefer laser cladding, friction-stir or mechanical inserts.
What surface finishes work on QC-10-T7451?
Hard (Type III) anodize, electroless nickel or PVD for wear and corrosion protection of cavities; can be polished to a fine mould finish but is easily dented, so plate protective coatings on high-wear faces.
Can QC-10-T7451 be formed, bent or molded?
Supplied only as stress-relieved thick plate for material removal; avoid cold forming and avoid re-solution treating, which destroys the flatness and residual-stress balance.
What is the maximum service temperature of QC-10-T7451?
QC-10-T7451 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.
Can FabDigit make parts in QC-10-T7451?
Yes — QC-10-T7451 is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Alcoa QC-10 Aluminum Mold Plate technical data — Alcoa / Arconic (2016)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- MMPDS-17 (7050 plate allowables, analogue data) — Battelle/FAA (2022)
- Aluminum Association Teal Sheets — Alloy and Temper Designations — The Aluminum Association (2018)
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.