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Temper condition of AL6061

Temper condition of AL6061

Temper condition of AL6061

(OP)
Hello,
Can someone help me ? how I can get hardness of Al 6061 to 35HV. max, now I try to aging of these at 420oC 4H and cooling 5 Hrs. but the hardness stand on 37-40 HV.

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