120MM厚SM490B钢板保材质可切割SM490B厂家直销
SM490B钢板化学成分(%熔炼分析)
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厚度mm
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C
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Si
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Mn
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P
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S
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≤50
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≤0.18
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≤0.55
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≤1.60
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≤0.035
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≤0.035
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>50
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≤0.20
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≤0.55
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≤1.60
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≤0.035
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≤0.035
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