Q/BQB 310-2019: Hot-rolled steel sheets and strips for automotive structures

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Scope

Table 2
Table 3
Designation
Chemical composition a (mass fraction) %
a In order to improve the performance of the steel, other alloying elements can be added as required. At this time,
the lower limit of Alt is not required.
Designation Chemical composition
a (mass fraction) %
a One or more alloy elements of Nb, V, Ti can be added to steel, but Nb+V+Ti ≤0.22.