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NV F420 steel plate, also written as DNV F420, DNV Grade F420, VL F420 (newer DNV Rules designation) or market names such as FH42 / FQ43, is the extra-high-strength hull structural steel of DNV Rules for Classification of Ships (IACS UR W16 extra-high-strength family) with 420 MPa minimum yield, 530-680 MPa tensile strength and Charpy V-notch toughness at -60°C [-76°F]. In the grade name, "F" is the toughness class, and "420" is the yield-strength level in MPa. Gangsteel, a steel plate exporter, supplies DNV NV F420 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 F420 tables and LR FH42 / ABS FQ43 sibling pages on gangsteel.net. Official mill/certificate grade is NV F420 (VL F420). Verify the current DNV edition before ordering.
| Element | C | Mn | Si | P | S | Al (acid sol.) |
|---|---|---|---|---|---|---|
| NV F420, % | 0.18 max | 1.60 max | 0.10-0.55 | 0.025 max | 0.025 max | 0.015 min |
| Element | N | Nb | V | Ti | B | Notes |
| NV F420, % | 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 | 0.18 max | 0.22 max |
| Mn | 1.60 max | see A6 Table A vs heat upper limit |
| Si | 0.10-0.55 | 0.05–0.61 (approx. A6) |
| P | 0.025 max | 0.035 max |
| S | 0.025 max | 0.035 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 F420 | 420 MPa [61 ksi] | 530-680 MPa [77-99 ksi] | 18% |
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 | -60°C [-76°F] | 42 J | 28 J |
| 50<t≤70 mm | -60°C [-76°F] | 42 J | 28 J |
| 70<t≤100 mm | -60°C [-76°F] | 42 J | 28 J |
Per IACS UR W16 / DNV extra-high-strength practice as reflected on live DNV F420 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. F-class (NV F420 / FH42) grades are supplied normalized or TMCP (often with Ni alloying for -60°C toughness); as-rolled delivery is not permitted. 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 F420 / VL F420 (LR FH42 / ABS FQ43) |
| LR (Lloyd's Register) | LR FH42 steel plate |
| CCS | CCS F420 steel plate |
| GL | GL F420 steel plate |
| BV | BV F420 steel plate |
| NK | NK F43 steel plate |
| KR | KR F43 steel plate |
| RINA | RINA F420 steel plate |
IACS societies align extra-high-strength hull grades under UR W16; naming differs (DNV F420, LR FH42, ABS FQ43). 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 420 MPa minimum yield, 530-680 MPa tensile strength and Charpy toughness at -60°C [-76°F].
NV (or VL) is the DNV grade prefix. The letter F is the toughness class (Charpy at -60°C [-76°F]), and 420 is the yield-strength level in MPa. Market/LR naming often uses FH42; ABS often uses FQ43.
Minimum 420 MPa (61 ksi), tensile 530-680 MPa (77-99 ksi), elongation about 18% min (for the common thickness range).
Charpy V-notch at -60°C [-76°F]. Typical longitudinal average minimum is 42 J (transverse 28 J) for the tabulated thickness range on this grade page.
Same 420 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 F420 is UR W16 extra-high-strength (420 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. F-class (NV F420 / FH42) grades are supplied normalized or TMCP (often with Ni alloying for -60°C toughness); as-rolled delivery is not permitted.
Common supply is about 6-100 mm (thicker by agreement under UR W16 / DNV rules), 1500-4000 mm wide and 6000-18000 mm long.
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DNV NV F420 corresponds to extra-high-strength counterparts under other IACS societies (LR FH42, ABS FQ43, etc.): LR FH42 steel plate, CCS F420 steel plate, GL F420 steel plate, BV F420 steel plate, NK F43 steel plate, KR F43 steel plate, RINA F420 steel plate.
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