Differences Between DNV Grade AH32 and DNV Grade AH36 Shipbuilding Steel Plates
- Jun 17, 2026
Knowledge
Differences Between DNV Grade AH32 and DNV Grade AH36 Shipbuilding Steel Plates
I. Meaning of the Designation
A: Grade A (0°C impact).
H: High strength.
32/36: Yield strength grade (32 ≈ 315 MPa, 36 ≈ 355 MPa)
II. Differences in Core Mechanical Properties
| Property | DNV Grade AH32 (NV A32) | DNV Grade AH36 (NV A36) |
|---|---|---|
| Yield Strength | ≥ 315 MPa | ≥ 355 MPa |
| Tensile Strength | 450 - 570 MPa | 490 - 630 MPa |
| Elongation | ≥ 22% | ≥ 21% |
| Impact Test (0°C) | ≥ 31 J (longitudinal) | ≥ 34 J (longitudinal) |
III. Differences in Chemical Composition and Manufacturing Processes
| Property | DNV Grade AH32 (NV A32) | DNV Grade AH36 (NV A36) |
|---|---|---|
| Chemical Composition | Low alloy content | Strict microalloying (Nb/V/Ti) |
| Manufacturing Processes | AR, CR, and N. | CR, TMCP, N and Q + T |
IV. Differences in Application Scenarios
DNV Grade AH32 (NV A32): Small- and medium-sized vessels, ferries, general hull structures, and superstructures; more cost-effective and easier to machine.
DNV Grade AH36 (NV A36): Large container ships, bulk carriers, oil tankers, offshore platforms, and high-stress bulkheads/decks; offers high strength and allows for thinner walls to reduce weight.
V. Selection Recommendations
Prioritize DNV Grade AH32 (NV A32): Small-to-medium-sized vessels, non-critical structures, budget-sensitive projects, and applications requiring complex forming or welding.
Prioritize DNV Grade AH36 (NV A36): Large vessels, high-load applications, weight-reduction requirements, and critical load-bearing components.
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