Q/BQB 419-2019: Cold-rolled Ordinary High Strength Steel Sheet and Strip

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Scope

Table 4
Table 4 – Continued
Designation
Chemical compositions (smelting analysis) % (mass fraction)
No more than No more than No more than No more than No less than No more than No more than No more than
a Nb is allowed to partially or completely replaced Ti; while the total content of Nb and/or Ti is no greater than 0.20%.
b Nb is allowed to partially or completely replaced Ti; while the total content of Nb and/or Ti is no greater than 0.12%.
c Ti may be used to partially or completely replace Nb; while the total content of Ti and/or Nb is ≤ 0.10%.
d Ti and Nb may be added individually or in combination. V and B may also be added; while the total content of these alloy elements is ≤ 0.22%.