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GB/T8163 10 335??475 ??205 ??24
20 410??550 ??245 ??20
Q345 490??665 ??325 ??21
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C Si Mn P S Cr Ni Cu
GB/T8163 10 0.07??0.14 0.17??0.37 0.35??0.65 ??0.035 ??0.035 ??0.15 ??0.25 ??0.25
20 0.17??0.24 0.17??0.37 0.35??0.65 ??0.035 ??0.035 ??0.25 ??0.25 ??0.25
Q345 0.12??0.20 0.20??0.55 1.20??1.60 ??0.045 ??0.045 / /
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