Magnesium Alloy AS41B · finish state · default condition
Magnesium Alloy AS41B As Cast
Properties of the As Cast condition, compared with the other AS41B tempers.
The only commercial condition: high-pressure die cast and used as-cast, chosen for thin-wall parts needing creep resistance to ~175 °C.
What is AS41B As Cast?
AS41B As Cast is AS41B supplied in the As Cast condition — the only commercial condition: high-pressure die cast and used as-cast, chosen for thin-wall parts needing creep resistance to ~175 °C. AS41B As Cast has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 61% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi). AS41B As Cast has a density of 1.77 g/cm³ (0.0639 lb/in³), lighter than 86% of magnesium alloy grades. It melts at 565°C (1,049 °F).
Advantages
- High service temperature — 175°C (347 °F), better than 79% of magnesium alloy grades
Limitations
- Poor heat conductor — 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 82% of magnesium alloy grades
- Difficult to weld — 35/100, worse than 80% of magnesium alloy grades
AS41B As Cast properties
Typical room-temperature values for AS41B As Cast — 13 properties are specific to this condition; the rest are grade-level values shared by every AS41B temper. Each bar shows where the value sits among the magnesium alloy grades in FabDigit's library — further right is higher.
Physical3
AS41B As Cast has a density of 1.77 g/cm³ (0.0639 lb/in³), lighter than 86% of magnesium alloy grades. It melts at 565°C (1,049 °F).
Mechanical13
AS41B As Cast has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 61% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AS41B As Cast is rated for continuous service to 175°C (347 °F). It conducts heat at 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 82% of magnesium alloy grades. Thermal expansion is 26.1 µm/m·K (14.5 µin/in·°F).
Electrical3
AS41B As Cast conducts electricity at 13.5 % IACS, worse than 64% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 87% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AS41B As Cast takes about 320 MJ of energy and emits 32 kg of CO₂ — less than 74% of magnesium alloy grades. Typical recycled content is 30%.
Manufacturability8
AS41B As Cast's machinability is excellent (95/100, better than 54% of magnesium alloy grades); weldability fair (35/100); 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.
Working with AS41B As Cast
Is AS41B easy to machine?
Cuts extremely fast with sharp, high-rake, polished-flute tools and generous chip clearance; run dry or with mineral oil — never water-based coolant — and collect fines to avoid fire risk.
Can AS41B be welded?
GTAW/GMAW with AZ61A or AZ92A filler is possible on clean material, but die-cast porosity outgasses, so joining is normally by fasteners or adhesive rather than welding.
Can AS41B be formed, bent or molded?
High-pressure die casting only; Mg₂Si raises viscosity slightly so use hotter dies and higher gate velocity than AZ91D, and expect shorter die life; no cold forming or heat treatment is applied.
What surface finishes work on AS41B?
Deburr, alkaline clean, then chromate-free conversion coat or PEO/HAE anodic coat followed by primer + topcoat or powder coat; isolate steel fasteners with coated or Al inserts to prevent galvanic corrosion.
AS41B 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 |
|---|---|---|
| Alsolid-solution and Mg17Al12 former | 3.7 – 4.8 | 4.2 |
| Siforms Mg2Si for creep resistance | 0.6 – 1.4 | 1 |
| Mniron control, corrosion | 0.35 – 0.7 | 0.45 |
| Zn | ≤ 0.12 | — |
| Cuhigh-purity limit | ≤ 0.02 | — |
| Nihigh-purity limit | ≤ 0 | — |
| Fehigh-purity limit (Fe/Mn ratio controlled) | ≤ 0 | — |
| Others (each) | ≤ 0.01 | — |
| Mg | balance | — |
AS41B As Cast — frequently asked
What is AS41B As Cast used for?
AS41B As Cast is typically used for engine crankcase and cover castings, gearbox housings, oil pan and sump castings, air-cooled engine housings, bracketry near heat sources and power-tool gear housings. In short: high-temp die-cast magnesium.
What is the yield strength of AS41B As Cast?
AS41B As Cast has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 215 MPa (31.2 ksi) — weaker than 61% of magnesium alloy grades.
Is AS41B As Cast easy to machine?
Yes — machinability is rated excellent (95/100, better than 54% of magnesium alloy grades). Cuts extremely fast with sharp, high-rake, polished-flute tools and generous chip clearance; run dry or with mineral oil — never water-based coolant — and collect fines to avoid fire risk.
Can AS41B As Cast be welded?
With care — weldability is rated fair (35/100). GTAW/GMAW with AZ61A or AZ92A filler is possible on clean material, but die-cast porosity outgasses, so joining is normally by fasteners or adhesive rather than welding.
What surface finishes work on AS41B As Cast?
Deburr, alkaline clean, then chromate-free conversion coat or PEO/HAE anodic coat followed by primer + topcoat or powder coat; isolate steel fasteners with coated or Al inserts to prevent galvanic corrosion.
Can AS41B As Cast be formed, bent or molded?
High-pressure die casting only; Mg₂Si raises viscosity slightly so use hotter dies and higher gate velocity than AZ91D, and expect shorter die life; no cold forming or heat treatment is applied.
What is the maximum service temperature of AS41B As Cast?
AS41B As Cast is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in AS41B As Cast?
Yes — AS41B As Cast is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B94 — Standard Specification for Magnesium-Alloy Die Castings — ASTM International (2018)
- SAE J465 / UNS M10412 alloy designation — SAE International (2016)
- 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: Materials (magnesium galvanic behaviour) — 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.