DNV A36 Steel Plate | NV A36/AH36 Shipbuilding Plate

NV A36 / AH36 steel plate, also written as DNV A36, DNV Grade A36, VL A36 (newer DNV Rules designation), AH36 or DNV AH36 ship steel plate, is the higher-strength hull structural steel of DNV Rules for Classification of Ships (IACS UR W11 higher-strength family) with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy V-notch toughness at 0°C [32°F]. In the grade name, "A" is the toughness class, and "36" refers to the strength level (historically about 36 kgf/mm²); the market name AH36 adds "H" for higher strength. This page uses the market-name URL identity DNV AH36; the mill certificate grade remains NV A36 (VL A36). Canonical mill-name page: DNV A36 steel plate. Gangsteel, a steel plate exporter, supplies DNV NV A36 / AH36 plates cut to size for shipbuilding, offshore platforms and marine structures.

Data source: Per IACS UR W11 (ordinary/higher-strength hull structural steel) as adopted in DNV hull structural steel rules. Official mill/certificate grade is NV A36 (VL A36 under current DNV Rules); AH36 is the common IACS market name. Verify the current DNV edition before ordering.

NV A36 / AH36 Chemical Composition (Heat Analysis)

Per IACS UR W11 / DNV hull structural steel rules (higher-strength grades). Nb, V and Al grain-refining elements may be used singly or in combination; when used in combination the individual minima do not apply. Where acid-soluble Al is not less than 0.015%, the Si minimum does not apply. Carbon equivalent: Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 (%).

Product Analysis (Check Analysis)

IACS UR W11 / DNV rules do not separately tabulate product (check) analysis limits for higher-strength grades. When product analysis is required, the finished plate shall meet the heat limits subject to ASTM A6/A6M Table A permitted variations (same practice as other IACS societies).

Per IACS UR W11 / DNV hull structural steel rules. Product analysis applies only when specified; for a range, results may not vary both above and below it.

NV A36 Mechanical Properties

Per IACS UR W11 / DNV hull structural steel rules. Yield and tensile values apply for the full thickness range covered by the grade (typically up to 100 mm for these ship plates).

Charpy V-Notch Impact Requirements (0°C [32°F])

Per IACS UR W11 / DNV hull structural steel rules. Average of three full-size Charpy V-notch specimens; not more than one value below the average and none below 70% of it. Longitudinal values shown; transverse values apply when required by the rules or purchase order. Thicker plates (above 100 mm) may be supplied by agreement with adjusted impact requirements.

Delivery Condition and Deoxidation

Deoxidation: Killed, fine-grain practice. Delivery condition: A-class (NV A36 / AH36) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP. Optional extras by agreement include ultrasonic testing, Z-direction (Z15/Z25/Z35) through-thickness testing and third-party DNV survey.

Thickness Coverage

Higher-strength DNV NV A/D/E/F 32/36/40 plates are commonly supplied from about 6 mm to 100 mm thick (up to 150 mm by agreement). Width 1500-4000 mm and length 6000-18000 mm are typical.

Equivalent Steel Grades of NV A36

IACS member societies harmonize ordinary and higher-strength hull grades under UR W11; dual certification (for example DNV + ABS, or DNV + ASTM A131) is common when ordered that way.

FAQ about DNV A36 / NV A36 Steel Plate

What is DNV A36 (NV A36) steel plate?

It is a higher-strength hull structural steel under DNV Rules for Classification of Ships (IACS UR W11), with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy toughness at 0°C [32°F]. The mill certificate grade is NV A36 (VL A36 in newer DNV Rules); AH36 is the common market name.

What does NV A36 / AH36 stand for?

NV (or VL) is the DNV grade prefix. The letter A is the toughness class (Charpy at 0°C [32°F]), and 36 is the strength level (historically about 36 kgf/mm², now 355 MPa min yield). AH36 adds "H" for higher strength in the IACS market naming.

What is the yield strength of DNV NV A36?

Minimum 355 MPa (51 ksi), tensile 490-620 MPa (71-90 ksi), elongation about 21% min.

What is the impact test temperature for NV A36?

Charpy V-notch at 0°C [32°F]. Longitudinal average minima are 34 J up to 50 mm, 41 J for 50-70 mm and 50 J for 70-100 mm.

What is the difference between NV A36 and other 36-class grades?

Same 355 MPa strength class. NV A36 at 0°C [32°F]; NV D36 at -20°C [-4°F]; NV E36 at -40°C [-40°F]; NV F36 at -60°C [-76°F]. Delivery condition follows the toughness letter rules.

What is the difference between NV A36 and NV A32?

Same A-class toughness (Charpy at 0°C [32°F]). NV A36 is strength class 36 (355 MPa min yield); NV A32 is strength class 32 (315 MPa min yield).

Is NV A36 the same as ABS AH36 or LR AH36?

Requirements are essentially harmonized under IACS UR W11. ABS AH36, LR AH36 and ASTM A131 AH36 (where listed) are counterparts; dual certification is common when ordered with the required surveys.

Is DNV NV A36 weldable?

Yes. Controlled carbon and Ceq give good weldability; preheat may be required for thick sections depending on Ceq and restraint.

What heat treatment is required for NV A36?

A-class (NV A36 / AH36) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP.

What thickness is available for DNV A36?

Typical supply is about 6-100 mm thick (up to 150 mm by agreement), 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 EH40 steel plate

Equivalent Class Society Grades

DNV NV A36 / AH36 corresponds to the same grade under the other IACS member classification societies and ASTM A131: LR AH36 steel plate, ABS AH36 steel plate, CCS AH36 steel plate, ASTM A131 AH36 steel plate, GL AH36 steel plate, BV AH36 steel plate, NK A36 steel plate, KR A36 steel plate, RINA AH36 steel plate.