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Si:0.25

Fe:0.30

Cu:0.05~0.20

Mn:0.20~0.50

Mg:2.0~2.8

Cr:0.15~0.25

Zn:4.0~4.8

Ti:0.05~0.18

Zr:0.05~0.15

Al:Êe¶q

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