DNV D620 Steel Plate | NV D620 Shipbuilding Steel Plate

NV D620 steel plate, also written as DNV D620, DNV Grade D620, VL D620 (newer DNV Rules designation) or market names such as DH62 / DQ63, is the extra-high-strength hull structural steel of DNV Rules for Classification of Ships (IACS UR W16 extra-high-strength family) with 620 MPa minimum yield, 720-890 MPa tensile strength and Charpy V-notch toughness at -20°C [-4°F]. In the grade name, "D" is the toughness class, and "620" is the yield-strength level in MPa. Gangsteel, a steel plate exporter, supplies DNV NV D620 plates cut to size for shipbuilding, offshore platforms and marine structures.

Data source: Per IACS UR W16 (extra-high-strength hull structural steel) as adopted in DNV hull structural steel rules, cross-checked with live DNV D620 tables and LR DH62 / ABS DQ63 sibling pages on gangsteel.net. Official mill/certificate grade is NV D620 (VL D620). Verify the current DNV edition before ordering.

NV D620 Chemical Composition (Heat Analysis)

 

Element	C	Mn	Si	P	S	Al (acid sol.)
NV D620, %	0.20 max	1.70 max	0.10-0.55	0.030 max	0.030 max	0.015 min
Element	N	Nb	V	Ti	B	Notes
NV D620, %	0.020 max	0.02-0.05	0.04-0.10	0.02 max	0.005 max	Ni/Cu/Cr/Mo per delivery condition (N/TM/QT) in UR W16

Per IACS UR W16 / DNV extra-high-strength rules. Exact maxima for Ni, Cu, Cr and Mo depend on delivery condition (N/NR, TM or QT). Carbon equivalent / CET / Pcm limits apply by thickness and condition; confirm on the mill certificate and current rule edition.

Product Analysis (Check Analysis)

 

When product analysis is required, apply ASTM A6/A6M Table A permitted variations to the heat limits unless the element is min-only or not listed in Table A.

Element	Heat analysis limit	Product analysis (heat ± A6)
C	0.20 max	0.24 max
Mn	1.70 max	see A6 Table A vs heat upper limit
Si	0.10-0.55	0.05–0.61 (approx. A6)
P	0.030 max	0.040 max
S	0.030 max	0.040 max
Al (acid sol.)	0.015 min	no A6 Table A tolerance; product value not tabulated
N	0.020 max	0.025 max (typical A6 +0.005)
Nb	0.02-0.05	0.010–0.060
V	0.04-0.10	0.030–0.110
Ti	0.02 max	0.03 max
B	0.005 max	product analysis often not applicable

Product analysis applies only when specified; for a range, results may not vary both above and below it.

NV D620 Mechanical Properties

 

Grade	Yield strength, min	Tensile strength	Elongation, min
NV D620	620 MPa [90 ksi]	720-890 MPa [104-129 ksi]	15%

Per IACS UR W16 / DNV rules (common t≤50 mm values shown on live DNV grade pages). Yield may step down for thicker plates per UR W16; confirm thickness-dependent values on the order.

Charpy V-Notch Impact Requirements (-20°C [-4°F])

 

Thickness	Test temperature	Longitudinal, avg min	Transverse, avg min
t≤50 mm	-20°C [-4°F]	62 J	41 J
50<t≤70 mm	-20°C [-4°F]	62 J	41 J
70<t≤100 mm	-20°C [-4°F]	62 J	41 J

Per IACS UR W16 / DNV extra-high-strength practice as reflected on live DNV D620 pages (same energy across the listed bands). Average of three full-size specimens; transverse values apply when required. Thicker plates by agreement.

Delivery Condition and Deoxidation

Deoxidation: Killed, fine-grain practice. Delivery condition: typically TMCP or QT for extra-high-strength plates; N/NR may apply at lower extra-high levels per rules. D-class (NV D620 / DH62) grades are typically normalized or TMCP; controlled-rolled delivery may apply within rule limits. Optional extras: UT, Z15/Z25/Z35, DNV survey.

Thickness Coverage

Extra-high-strength DNV NV A/D/E/F 420-690 plates are commonly supplied from about 6 mm to 100 mm thick (thicker by agreement under UR W16). Width 1500-4000 mm and length 6000-18000 mm are typical.

Equivalent Steel Grades of NV D620

 

Society / Standard	Equivalent grade
DNV	NV D620 / VL D620 (LR DH62 / ABS DQ63)
LR (Lloyd's Register)	LR DH62 steel plate
ABS	ABS DQ63 steel plate
CCS	CCS D620 steel plate
GL	GL D620 steel plate
BV	BV D620 steel plate
NK	NK D63 steel plate
RINA	RINA D620 steel plate

IACS societies align extra-high-strength hull grades under UR W16; naming differs (DNV D620, LR DH62, ABS DQ63). Dual certification is common when ordered that way.

FAQ about DNV D620 / NV D620 Steel Plate

What is DNV D620 (NV D620) steel plate?

It is an extra-high-strength hull structural steel under DNV Rules for Classification of Ships (IACS UR W16 extra-high-strength family), with 620 MPa minimum yield, 720-890 MPa tensile strength and Charpy toughness at -20°C [-4°F].

What does NV D620 stand for?

NV (or VL) is the DNV grade prefix. The letter D is the toughness class (Charpy at -20°C [-4°F]), and 620 is the yield-strength level in MPa. Market/LR naming often uses DH62; ABS often uses DQ63.

What is the yield strength of DNV NV D620?

Minimum 620 MPa (90 ksi), tensile 720-890 MPa (104-129 ksi), elongation about 15% min (for the common thickness range).

What is the impact test temperature for NV D620?

Charpy V-notch at -20°C [-4°F]. Typical longitudinal average minimum is 62 J (transverse 41 J) for the tabulated thickness range on this grade page.

What is the difference between NV A620, D620, E620 and F620?

Same 620 MPa strength class. Toughness class differs: A at 0°C, D at -20°C, E at -40°C, F at -60°C. Chemistry (C, P, S, Mn) is tightened for colder classes.

How does NV D620 differ from higher-strength NV A40?

NV A40 is UR W11 higher-strength (390 MPa). NV D620 is UR W16 extra-high-strength (620 MPa) with different chemistry and delivery practice (often TM/QT).

Is NV D620 the same as LR DH62 or ABS DQ63?

They are IACS counterparts in the extra-high-strength family; exact chemistry/delivery options differ by society edition. Dual certification is available when surveys are arranged.

Is DNV NV D620 weldable?

Weldable with approved procedures for extra-high-strength ship steel. Preheat, heat input and consumable matching are critical; follow the mill WPS and DNV welding requirements.

What heat treatment is required for NV D620?

Extra-high-strength grades are typically delivered TMCP or quenched and tempered (QT), sometimes normalized/normalized-rolled depending on strength level and thickness. D-class (NV D620 / DH62) grades are typically normalized or TMCP; controlled-rolled delivery may apply within rule limits.

What thickness is available for DNV D620?

Common supply is about 6-100 mm (thicker by agreement under UR W16 / DNV rules), 1500-4000 mm wide and 6000-18000 mm long.

Other DNV Steel Plate Grades

DNV Grade A steel plate | DNV Grade B steel plate | DNV Grade D steel plate | DNV Grade E steel plate | DNV A32 steel plate | DNV A36 steel plate | DNV A40 steel plate | DNV D32 steel plate | DNV D36 steel plate | DNV D40 steel plate | DNV E32 steel plate | DNV E36 steel plate | DNV E40 steel plate | DNV F32 steel plate | DNV F36 steel plate | DNV F40 steel plate | DNV AH36 steel plate | DNV EH40 steel plate | DNV A420 steel plate | DNV A460 steel plate | DNV A500 steel plate | DNV A550 steel plate | DNV A620 steel plate | DNV A690 steel plate | DNV D420 steel plate | DNV D460 steel plate | DNV D500 steel plate | DNV D550 steel plate | DNV D690 steel plate | DNV E420 steel plate | DNV E460 steel plate | DNV E500 steel plate | DNV E550 steel plate | DNV E620 steel plate | DNV E690 steel plate | DNV F420 steel plate | DNV F460 steel plate | DNV F500 steel plate | DNV F550 steel plate | DNV F620 steel plate | DNV F690 steel plate

Equivalent Class Society Grades

DNV NV D620 corresponds to extra-high-strength counterparts under other IACS societies (LR DH62, ABS DQ63, etc.): LR DH62 steel plate, ABS DQ63 steel plate, CCS D620 steel plate, GL D620 steel plate, BV D620 steel plate, NK D63 steel plate, RINA D620 steel plate.