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Q-BQB 310-2009
Q-BQB 310-2009
Q-BQB 310-2009 standard specifies the size, shape, technical requirements, inspection and testing,packaging,marking and inspection documents of hot rolled steel sheet and strip for cycling structure.Q-BQB 310-2009 standard main steel grade:B440QK,B480QZR,B440QZR, B550L,B510DL,B510L and so on.

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