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C
Mn
Si
P
S
Ni
Cr
Mo
Cu
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0.20
1.00-2.50
1.0
0.03
0.03
20.0-22.5
25.0-28.0
0.75
0.75
¨ÒÈ 0.18 1.92 0.74 0.012 0.002 21.49 25.83 0.18 0.006
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Rm
(MPa)
A
(%)
«OÃÒÈ
550
25
¨ÒÈ 645 33.3