Introduction
C355.0 is a casting grade in the Aluminum-Silicon Alloy family, specified in ASTM B26/B26M. The specification defines its chemical composition and mechanical requirements for the applicable sand-casting tempers. Casting process options include Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | C355.0 |
| Material Type | Aluminum Alloy |
| Sub Type | Aluminum-Silicon Alloy |
| Product Form | casting |
Manufacturing Process
Sand Casting
Equivalent Grades
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| ASTM B26/B26M | Standard Specification for Aluminum-Alloy Sand Castings | 05 | C355.0 | UNS A33550 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM B26/B26MEdition 05 · wt.% |
|---|---|
| Si | 4.5–5.5 |
| Fe | ≤ 0.20 |
| Cu | 1.0–1.5 |
| Mn | ≤ 0.10 |
| Mg | 0.40–0.6 |
| Zn | ≤ 0.10 |
| Ti | ≤ 0.20 |
| Al | remainder |
Notes
ASTM B26/B26M · Edition 05
[1] Chemical composition: Other elements, each: ≤ 0.05 wt.%
[2] Chemical composition: Other elements, total: ≤ 0.15 wt.%
Heat Treatment
ASTM B26/B26M–05 · Sand Casting · T6 · Recommended heat treatment
Notes
ASTM B26/B26M · Edition 05
[1] T6, T6 · Recommended heat treatment: Source: ASTM B917/B917M–25 (Recommended; when specified by the material specification or purchase order).; ±10°F; Use suitable metal-temperature measurement; sections/microstructure affect soak time selection (7.2).; Quench in water at 150 to 212°F except as noted.; Time at solution temperature may be increased for section thickness over 1 in.; ±5°C; Quench in water at 65 to 100°C except as noted.; Time at solution temperature may be increased for section thickness over 25 mm.
[2] T6, T6 · Recommended heat treatment: room temperature; Source: ASTM B917/B917M–25 (Recommended; when specified by the material specification or purchase order).; ±10°F; Use suitable metal-temperature measurement; sections/microstructure affect soak time selection (7.2).; Stress relieve for dimensional stability: hold at 775 ± 25°F for 5 h; furnace cool to 650°F for 2 or more h; furnace cool to 450°F for not more than 3/4 h; furnace cool to 250°F for approximately 2 h; cool to room temperature in still air outside the furnace.; No quenching required. Cool in still air outside the furnace.; ±5°C; Stress relieve for dimensional stability: hold at 415 ± 15°C for 5 h; furnace cool to 345°C for 2 or more h; furnace cool to 230°C for not more than 3/4 h; furnace cool to 120°C for approximately 2 h
[3] T6, T6 · Recommended heat treatment: Source: ASTM B917/B917M–25 (Recommended; when specified by the material specification or purchase order).; ±10°F; Use suitable metal-temperature measurement; sections/microstructure affect soak time selection (7.2).; Stress relieve for dimensional stability: hold at 775 ± 25°F for 5 h; furnace cool to 650°F for 2 or more h; furnace cool to 450°F for not more than 3/4 h; furnace cool to 250°F for approximately 2 h; cool to room temperature in still air outside the furnace.; No quenching required. Cool in still air outside the furnace.; ±5°C; Stress relieve for dimensional stability: hold at 415 ± 15°C for 5 h; furnace cool to 345°C for 2 or more h; furnace cool to 230°C for not more than 3/4 h; furnace cool to 120°C for approximately 2 h
Mechanical Properties
| Property | ASTM B26/B26MEdition 05 |
|---|---|
| Tensile Strength | ≥ 36.0 ksi / ≥ 250 MPa[1] |
| Yield Strength (Rp0.2) | ≥ 25.0 ksi / ≥ 170 MPa[1] |
| Elongation | ≥ 2.5 %[1] |
| Brinell Hardness | 80 HB[2] |
Notes
ASTM B26/B26M · Edition 05
[1] Tensile Strength/Yield Strength (Rp0.2)/Elongation: inch-pound; 2 in. or 4 x diameter / SI; 5 x diameter
[2] Brinell Hardness: inch-pound; 2 in. or 4 x diameter; 500 kgf; 10 mm; Typical hardness is for information only, not required for acceptance
Welding Conditions
N/A
Applications
At the material-family level, typical applications include custom, shaped aluminum sand-cast components for non-aerospace use. ASTM B26/B26M excludes aerospace applications; suitability of this grade must be checked against the component requirements and specified temper.
Last Updated: October 13, 2026