How to judge DNV GL grade B steel quality

Posted:2020-09-04 15:57:36

DNV GL grade B steel is grade B hull structural steel certified by Det Norske Veritas (DNV) and Germanischer Lloyd (GL ), which are one classification society now, shorten as DNV.GL. DNV GL grade B steel is widely used in ship construction industry. We receive huge orders about DNV GL grade B steel regularly. But do you know how to judge DNV GL grade B steel quality?

First, according to DNV GL rules, if the DNV GL grade B steel quality is OK, it needs to meet below the chemical composition and mechanical properties requirements at least.

Good DNV GL grade B steel quality should meet below chemical composition requirements:

Grade	C	Si	Mn	P	S	N
DNV GL grade B	0.21	0.35	0.80	0.035	0.035	0.02

Good DNV GL grade B steel quality should meet below mechanical property requirements:

Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
DNV GL grade B	mm	Min Mpa	Mpa	Min %	0	J	J
	t≤50	235	400-520	18%		20	27
	50<t≤70	235	400-520	18%		24	34
	70<t≤100	235	400-520	18%		27	41
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

If the chemical composition and mechanical properties are met, but you are still worried about DNV GL grade B steel quality, you may ask to arrange third party inspection such as SGS. Besides, you may also choose reputable DNV GL grade B steel supplier to better control DNV GL grade B steel quality.

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