A356 Aluminum Casting Alloy

Designations: 356 · UNS A13560 · Al-Si7MgA356 is an aluminum–silicon–magnesium casting alloy chosen where a casting has to be strong, pressure-tight and weldable. Around 7% silicon gives the fluidity to fill thin sections; the magnesium is what lets the alloy respond to T6 heat treatment, which is where its strength comes from. It is specified for structural and aerospace components, wheels, and housings that must hold pressure. Kormax casts A356 in the temper you specify.

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Chemical Composition

A356 Aluminum Alloy — chemical composition, % by weight
Element	Symbol	Range / limit %
Silicon	Si	6.5–7.5
Magnesium	Mg	0.25–0.45
Copper	Cu	0.20 max
Iron	Fe	0.20 max
Manganese	Mn	0.10 max
Zinc	Zn	0.10 max
Titanium	Ti	0.20 max
Aluminum	Al	Balance

Mechanical Properties

Sand castings — ASTM B26

A356 Aluminum Alloy — mechanical properties, sand castings
Temper	Tensile	Yield	Elongation
F (as-cast)	130 MPa / 19.0 ksi	—	2.0%
T51	160 MPa / 23.0 ksi	110 MPa / 16.0 ksi	—
T6	205 MPa / 30.0 ksi	140 MPa / 20.0 ksi	3.0%
T71	170 MPa / 25.0 ksi	125 MPa / 18.0 ksi	3.0%

Permanent mold castings — ASTM B108

A356 Aluminum Alloy — mechanical properties, permanent mold castings
Temper	Tensile	Yield	Elongation
F (as-cast)	145 MPa / 21.0 ksi	—	3.0%
T51	170 MPa / 25.0 ksi	—	—
T6	230 MPa / 33.0 ksi	150 MPa / 22.0 ksi	3.0%
T71	170 MPa / 25.0 ksi	—	3.0%

Specified minima under ASTM B26 (sand) and ASTM B108 (permanent mold). Properties vary with section thickness — confirmed at order. Kormax supplies A356 to the temper you specify.

Got the numbers you needed? Kormax pours A356 in sand, permanent mold and investment casting.

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Comparable and Related Specifications

The standards and grades below may have similar composition, properties or applications, but they should not be treated as direct equivalents without review. Chemistry, heat treatment, toughness requirements and testing provisions can differ between standards.

ASTM: B26/B26M (sand) · B108 (permanent mold)
Aluminum Association: A356.0
UNS: A13560
ISO (International): Al-Si7Mg
Afnor: A-S7G
SAE / DIN: 323 / G-AlSi7Mg
EN (EU/US): 42000
BS (British Standard): BS 1490 LM25
GB (Chinese Standard): ZL104