关于钢管的化学元素问题例如:结构用无缝钢管 GB/T 8162-2008 Q235 A级C(炭)≤0.22 SI(硅)≤0.35 Mn(锰)≤1.40 P(磷)和 S(硫)不大于0.030那么我请问一下:如果SI(硅Mn(锰) P(磷)和 S(硫)多了
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