Aluminum AlSi7Mg0.6-SR (Stress relieved)
Heat-treated state
EN AlSi7Mg0.6
Standard build-plate stress relief before part removal; softens the structure but maximises ductility and dimensional stability.
Values for the SR condition
Other AlSi7Mg0.6 tempers and conditions
AlSi7Mg0.6 is listed in 6 conditions; see the grade overview at AlSi7Mg0.6.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Standard build-plate stress relief before part removal; softens the structure but maximises ductility and dimensional stability. | 210 | 300 | 13 | 83 HB | 38 % IACS |
As built (as printed) | Highest as-printed strength from the ultrafine cellular Si network; choose when residual stress and distortion are acceptable and no thermal exposure follows. | 250 | 400 | 7 | 108 HB | 26 % IACS |
T6 variant, underaged | Pick when elongation and damage tolerance matter more than peak strength, e.g. crash- or fatigue-critical brackets. | 255 | 330 | 13 | 96 HB | 41 % IACS |
hot isostatic pressing (≈500–520 °C / 100 MPa) followed by solution treatment and ageing | Closes residual gas porosity to cut fatigue scatter; specified for flight-critical and cyclically loaded AM hardware. | 280 | 350 | 14 | 102 HB | 40 % IACS |
T6Default Solution heat treated and artificially aged | Default aerospace condition: balanced strength, ductility and fatigue life with a homogeneous spheroidised Si structure. | 285 | 355 | 10 | 105 HB | 39 % IACS |
Cooled from hot working and artificially aged | Cheapest strengthening route: no solution treatment or quench, so geometry stays true while strength rises above as-built. | 300 | 420 | 6 | 115 HB | 31 % IACS |
What is AlSi7Mg0.6-SR?
AlSi7Mg0.6-SR is AlSi7Mg0.6 heat treated to SR — standard build-plate stress relief before part removal; softens the structure but maximises ductility and dimensional stability. AlSi7Mg0.6-SR has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — stronger than 56% of aluminum grades. Elongation at break is 13% and the elastic modulus is 72 GPa (10.4 Msi). AlSi7Mg0.6-SR has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 555°C (1,031 °F). T6 is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
- Ductile — tolerates forming and impact — 13%, better than 79% of aluminum grades
AlSi7Mg0.6-SR properties
Typical room-temperature values for AlSi7Mg0.6-SR; 10 are specific to this condition. Other listed values are AlSi7Mg0.6 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
AlSi7Mg0.6-SR has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 555°C (1,031 °F).
Mechanical15
AlSi7Mg0.6-SR has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — stronger than 56% of aluminum grades. Elongation at break is 13% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
AlSi7Mg0.6-SR is rated for continuous service to 200°C (392 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
AlSi7Mg0.6-SR conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 57% of aluminum grades.
Sustainability4
Producing a kilogram of AlSi7Mg0.6-SR takes about 215 MJ of energy and emits 13.5 kg of CO₂ — more than 93% of aluminum grades. Typical recycled content is 10%.
Manufacturability8
AlSi7Mg0.6-SR's machinability is good (60/100, worse than 51% of aluminum grades); weldability good (65/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with AlSi7Mg0.6-SR
Is AlSi7Mg0.6 easy to machine?
Machines easily with polished-flute carbide or PCD tooling at high speed and generous coolant; abrasive Si particles wear HSS quickly and the alloy smears if feeds are too light.
Can AlSi7Mg0.6 be welded?
Laser and TIG weldable with 4043/4047 filler; expect Mg burn-off, hot-crack sensitivity in restrained joints, and re-heat-treatment to restore T6 properties.
Can AlSi7Mg0.6 be formed, bent or molded?
Not a wrought forming alloy — shaped by LPBF or casting; on the printer it needs 45° overhang support, a preheated plate (100–200 °C) and stress relief before build-plate removal.
What surface finishes work on AlSi7Mg0.6?
Blast/tumble to remove partially melted powder, then chemical conversion coating or hard anodize (dark grey); shot peening or machining of critical surfaces markedly improves fatigue life.
AlSi7Mg0.6 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 |
|---|---|---|
| Si | 6.5 – 7.5 | 7 |
| Mghigher than AlSi10Mg; drives Mg2Si age hardening | 0.45 – 0.7 | 0.6 |
| Tigrain refiner | 0.08 – 0.25 | 0.15 |
| Fekept low to avoid brittle β-AlFeSi platelets | ≤ 0.19 | 0.1 |
| Cu | ≤ 0.05 | — |
| Mn | ≤ 0.1 | — |
| Zn | ≤ 0.07 | — |
| Beonly in the US A357.0 variant (0.04–0.07 Be); EN AC-42200 and most AM powders are Be-free | ≤ 0.07 | — |
| Others (each)total ≤0.10 | ≤ 0.03 | — |
| Al | balance | — |
AlSi7Mg0.6-SR — frequently asked
What is AlSi7Mg0.6-SR used for?
AlSi7Mg0.6-SR is typically used for aerospace brackets, thin-wall castings-replacement parts, heat-treated structural AM parts and automotive lightweight components. In short: highest-elongation LPBF Al-Si; strong T6 heat-treat response; fatigue-critical AM alloy.
What is the yield strength of AlSi7Mg0.6-SR?
AlSi7Mg0.6-SR has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — stronger than 56% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is AlSi7Mg0.6-SR easy to machine?
Reasonably — machinability is rated good (60/100, worse than 51% of aluminum grades). Machines easily with polished-flute carbide or PCD tooling at high speed and generous coolant; abrasive Si particles wear HSS quickly and the alloy smears if feeds are too light.
Can AlSi7Mg0.6-SR be welded?
Yes — weldability is rated good (65/100). Laser and TIG weldable with 4043/4047 filler; expect Mg burn-off, hot-crack sensitivity in restrained joints, and re-heat-treatment to restore T6 properties.
What surface finishes work on AlSi7Mg0.6-SR?
Blast/tumble to remove partially melted powder, then chemical conversion coating or hard anodize (dark grey); shot peening or machining of critical surfaces markedly improves fatigue life.
Can AlSi7Mg0.6-SR be formed, bent or molded?
Not a wrought forming alloy — shaped by LPBF or casting; on the printer it needs 45° overhang support, a preheated plate (100–200 °C) and stress relief before build-plate removal.
What is the maximum service temperature of AlSi7Mg0.6-SR?
AlSi7Mg0.6-SR is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AlSi7Mg0.6-T6 and AlSi7Mg0.6-SR?
T6 is the default condition — default aerospace condition: balanced strength, ductility and fatigue life with a homogeneous spheroidised Si structure. SR: standard build-plate stress relief before part removal; softens the structure but maximises ductility and dimensional stability. Yield strength is 285 MPa in T6 versus 210 MPa in SR.
Sources
- EN 1706 — Aluminium and aluminium alloys, castings (EN AC-42200 AlSi7Mg0.6) — CEN (2020)
- ISO/ASTM 52907 — Additive manufacturing, feedstock materials, methods to characterize metal powders — ISO/ASTM (2019)
- AMS 4289 / ASTM B108 — A357.0 aluminium alloy castings — SAE / ASTM (2019)
- ASM Handbook Vol. 2 — Properties of Aluminum Casting Alloys (A357.0) — ASM International (1990)
- LPBF material datasheets for AlSi7Mg0.6 / A357 powder — EOS / SLM Solutions / Renishaw / Höganäs (2023)
- AM alloy property compilations (as-built, stress-relieved, T5/T6/T61, HIP) — Senvol / MMPDS-adjacent AM literature (2023)
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.