Q/BQB 303-2019: Continuously hot-rolled steel sheet and strip for general structure

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Newer version: (Replacing this standard) Q/BQB 303-2023
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Newer / historical versions: Q/BQB 303-2023

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Scope

Table 3
Designation Chemical composition
a (mass fraction) %
a Add other alloy elements as required.
b If Alt≥0.020 or Als≥0.015 or add other sufficient nitrogen-fixing elements, the maximum nitrogen is inapplicable. The inspection document
shall provide the nitrogen-fixing element content.