What is the Q355NB steel?

Q355NB steel description
Q355NB grade under GB/T1591-2018 standard is a low alloy structural steel of Q355 steel. This grade steel is delivered in normalized or normalizing rolling condition. The steel quality is B. If the Q355NB steel plates are required to have the Z-direction performance in thickness direction, the grade should be added the Z test level like Q355NBZ25.

Q355NB plate chemical composition(%)

C max.	Si max.	Mn	P max.	S max.	Cr max.	Ni max.	Cu max.	N max.	Nb	V	Ti	Mo max	N max
0.20	0.50	0.90-1.65	0.035	0.035	0.30	0.50	0.40	0.012	0.005 - 0.05	0.01-0.12	0.006 - 0.05	0.10	0.015

Note: ALs: 0.015 min.
Q355NB plate mechanical properties

Grade	Yield strength MPa in different thickness mm
	≤16	16-40	40-63	63-80	80-100	100-150	150-200	200-250
Q355NB	≥355	≥345	≥335	≥325	≥315	≥295	≥285	≥275

Tensile strength and elongation in different thickness mm

Grade	Tensile strength MPa			Elongation % min.
	≤100	100-150	150-250	≤16	16-40	40-63	63-80	80-200	200-250
Q355NB	470-630	450-600	450-600	22	22	22	21	21	21

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