Q/BQB 306-2019: Hot-rolled steel sheets and strips for automotive beam

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Table 2
Table 3
a In order to improve the steel properties, add other alloy elements as required; at this time, the lower limit of Alt is not required.
Designation Chemical compositions
a (mass fraction)
Designation Chemical compositions
a (mass fraction)
a One of or several alloy elements among Nb, V, Ti can be added to the steel, but Nb+V+Ti≤0.22.