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Aluminum Alloy A356 Chemical Composition and Heat Treatment

    Aluminum Alloy A356 Chemical Composition and Heat Treatment

    Aluminum alloy A356 Chemical Composition and Heat Treatment are frequently encountered in Permanent mold casting; as you know, this material have great yield strength; mechanical properties; and great filling; next, lets talk about this material and its treatment

    A356(AlSi7Mg0.3) aluminum alloy chemical composition

    Aluminium Alloy Material is very common in Sand Casting Foundry and permanent mold aluminum castings Foundry. There have 3 Brands, A356.0; A356.1; A356.2. Below please find the Chemical Properties.



    Aluminium Alloy A356(AlSi7Mg0.3) Mechanical Properties


    MaterialYield StrengthFracture StrengthElongationSection Shrinkage


    Cast ability and high strength, elongation is suitable for thin parts and places where pressure resistance is required, Performance advantages Has good fluidity, no hot cracking tendency, small linear shrinkage, good air tightness and other good casting properties, small specific gravity, good corrosion resistance.



    Various casings, aircraft pump parts, aircraft joints, automotive transmissions, pulleys, fuel tanks,High heat resistance branch stress parts, other machine tool parts.


    Heat treatment status code and meaning for casting aluminum alloy


    T1 Artificial aging

    For alloys cast in metal molds or wet sand molds, due to the rapid cooling rate, a certain degree of supersaturated solid solution has been obtained, already have partial quenching effect. after artificial aging and desolation strengthening; can increase the hardness and mechanical strength; also can improve the machinability.


    T2 Annealing


    The main role is to eliminate the internal stress of the casting (casting stress and stress caused by machining), stabilize the dimension of the casting, and spheroid the Si crystal of the Al-Si series alloy to improve its plasticity. The effect on Al-Si alloy is obvious, the annealing temperature is 280-300 ℃, and the holding time is 2-4h.


    T4 solution treatment (quenching) plus natural aging


    By heating and holding, the soluble phase is dissolved, and then quenched, so that a large number of strengthening phases are solid-dissolved in the α solid solution to obtain a supersaturated solid solution to improve the hardness, strength and corrosion resistance of the alloy. The final heat treatment is for Al-Mg series alloys, and the preliminary heat treatment is for other alloys that require artificial aging.


    T5 solution treatment (quenching) plus incomplete artificial aging


    It is used to obtain higher strength and plasticity, but the corrosion resistance will be reduced, especially the inter-granular corrosion will be increased. The aging temperature is low and the holding time is short. The aging temperature is about 150-170 ° C and the holding time is 3-5h.


    T6 solution treatment (quenching) plus full artificial aging


    It is used to obtain the highest strength, but the plasticity and corrosion resistance are reduced. Performed at higher temperatures and for longer periods of time. Suitable for parts requiring high load, aging temperature is about 175-185 ℃, holding time is more than 5h.


    T7 solution treatment (quenching) plus stabilization tempering


    It is used to stabilize the size and structure of castings, improve the resistance to corrosion (especially stress corrosion resistance), and maintain high mechanical properties. It is usually carried out near the working temperature of the part. Suitable for parts working at high temperature below 300 ℃, tempering temperature is 190-230 ℃, holding time is 4-9h.


    What is the difference between 6061 and 6082? aluminium alloy a356 and 6082?


     6061-T6 AluminumA356. 0 Aluminum6082-T6 Aluminum
    Elongation at Break10%3-6%10%
    Fatigue Strength96 MPa50-90 MPa96 MPa
    Shear Modulus26 GPa26 GPa26 GPa
    Ultimate Tensile Strength310 MPa160-270 MPa310 MPa
    Yield Tensile Strength270 MPa83-200 MPa260 MPa
    Melting Onset580℃570℃555℃
    Thermal Conductivity170 W/m-K150 W/m-K180 W/m.K
    Thermal Expansion24 μm/m-K21 μm/m-K24 μm/m-K
    Density2. 7g/cm32. 6g/cm32. 7g/cm3



    We are china permanent mold casting foundry. and familiar with Aluminum alloy A356 Chemical Composition and Heat Treatment; besides focus on aluminium alloy gravity die casting and CNC machining, Contact our team if you have similar Projection need to be developed.



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