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NV A500 steel plate, also written as DNV A500, DNV Grade A500, VL A500 (newer DNV Rules designation) or market names such as AH50 / AQ51, is the extra-high-strength hull structural steel of DNV Rules for Classification of Ships (IACS UR W16 extra-high-strength family) with 500 MPa minimum yield, 610-770 MPa tensile strength and Charpy V-notch toughness at 0°C [32°F]. In the grade name, "A" is the toughness class, and "500" is the yield-strength level in MPa. Gangsteel, a steel plate exporter, supplies DNV NV A500 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 A500 tables and LR AH50 / ABS AQ51 sibling pages on gangsteel.net. Official mill/certificate grade is NV A500 (VL A500). Verify the current DNV edition before ordering.
| Element | C | Mn | Si | P | S | Al (acid sol.) |
|---|---|---|---|---|---|---|
| NV A500, % | 0.21 max | 1.70 max | 0.10-0.55 | 0.035 max | 0.035 max | 0.015 min |
| Element | N | Nb | V | Ti | B | Notes |
| NV A500, % | 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.
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 | 0.21 max | 0.25 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 | 0.035 max | 0.045 max |
| S | 0.035 max | 0.045 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.
| Grade | Yield strength, min | Tensile strength | Elongation, min |
|---|---|---|---|
| NV A500 | 500 MPa [73 ksi] | 610-770 MPa [88-112 ksi] | 16% |
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.
| Thickness | Test temperature | Longitudinal, avg min | Transverse, avg min |
|---|---|---|---|
| t≤50 mm | 0°C [32°F] | 50 J | 33 J |
| 50<t≤70 mm | 0°C [32°F] | 50 J | 33 J |
| 70<t≤100 mm | 0°C [32°F] | 50 J | 33 J |
Per IACS UR W16 / DNV extra-high-strength practice as reflected on live DNV A500 pages (same energy across the listed bands). Average of three full-size specimens; transverse values apply when required. Thicker plates by agreement.
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. A-class (NV A500 / AH50) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP. Optional extras: UT, Z15/Z25/Z35, DNV survey.
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.
| Society / Standard | Equivalent grade |
|---|---|
| DNV | NV A500 / VL A500 (LR AH50 / ABS AQ51) |
| LR (Lloyd's Register) | LR AH50 steel plate |
| ABS | ABS AQ51 steel plate |
| CCS | CCS A500 steel plate |
| GL | GL A500 steel plate |
| BV | BV A500 steel plate |
| NK | NK A51 steel plate |
| KR | KR A51 steel plate |
| RINA | RINA A500 steel plate |
IACS societies align extra-high-strength hull grades under UR W16; naming differs (DNV A500, LR AH50, ABS AQ51). Dual certification is common when ordered that way.
It is an extra-high-strength hull structural steel under DNV Rules for Classification of Ships (IACS UR W16 extra-high-strength family), with 500 MPa minimum yield, 610-770 MPa tensile strength and Charpy toughness at 0°C [32°F].
NV (or VL) is the DNV grade prefix. The letter A is the toughness class (Charpy at 0°C [32°F]), and 500 is the yield-strength level in MPa. Market/LR naming often uses AH50; ABS often uses AQ51.
Minimum 500 MPa (73 ksi), tensile 610-770 MPa (88-112 ksi), elongation about 16% min (for the common thickness range).
Charpy V-notch at 0°C [32°F]. Typical longitudinal average minimum is 50 J (transverse 33 J) for the tabulated thickness range on this grade page.
Same 500 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.
NV A40 is UR W11 higher-strength (390 MPa). NV A500 is UR W16 extra-high-strength (500 MPa) with different chemistry and delivery practice (often TM/QT).
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.
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.
Extra-high-strength grades are typically delivered TMCP or quenched and tempered (QT), sometimes normalized/normalized-rolled depending on strength level and thickness. A-class (NV A500 / AH50) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP.
Common supply is about 6-100 mm (thicker by agreement under UR W16 / DNV rules), 1500-4000 mm wide and 6000-18000 mm long.
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 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 D620 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
DNV NV A500 corresponds to extra-high-strength counterparts under other IACS societies (LR AH50, ABS AQ51, etc.): LR AH50 steel plate, ABS AQ51 steel plate, CCS A500 steel plate, GL A500 steel plate, BV A500 steel plate, NK A51 steel plate, KR A51 steel plate, RINA A500 steel plate.
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