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Aluminum or steel material properties...
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JAC270D is a low carbon cold-rolled steel suitable for deep drawing. Ultimate tensile strength > 270 MPa, yield strength (depends on thickness, this is for 1 mm < t < 3.2 mm) 115-205 MPa. The composition is not explicitly defined, but it must be sufficiently resistant to aging (no stretcher strains for at least 3 months manufacturing). I am not familiar with the designation X621 for an aluminum alloy. Is this a casting or sheet metal?
For the aluminium alloy, the only thing close that comes to mind is the Alcoa alloy X6022 and 6111. The X has been dropped. Here is some information:
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