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Si:0.35

Fe:0.40

Cu:0.20

Mn:0.05~0.50

Mg:1.0~1.4

Cr:0.10~0.35

Zn4.0~5.0

Zr:0.08~0.20

Ti+Zr:0.08~0.25

Al:Êe¶q

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