What Is DNV EH36 (NV E36) Material?
- Jul 07, 2026
Knowledge
What Is DNV EH36 (NV E36) Material?
I. Meaning of Designations
DNV: Det Norske Veritas (DNV), one of the world’s most authoritative classification societies for ships. This designation indicates that the steel’s manufacturing process, chemical composition, and mechanical properties have all passed DNV’s rigorous audits and factory approvals, and that it may be legally used in ships and offshore engineering projects classified by DNV.
E: Represents the impact toughness grade, requiring sufficient impact toughness even at the most extreme low temperature of -40°C, making it suitable for navigation in polar or cold waters.
H: Represents high strength. Its minimum yield strength is 355 MPa.
36: Represents a minimum yield strength of 355 MPa (36 kgf/mm²).
II. Chemical Composition (wt %)
| Element | Limit | Description |
|---|---|---|
| C | ≤0.18% | Low carbon ensures weldability |
| Si | ≤0.50% | Deoxidation, strength enhancement |
| Mn | 0.90–1.60% | Microstructure refinement, toughness enhancement |
| P | ≤0.025% | Strict control of harmful impurities |
| S | ≤0.025% | Prevention of laminar tearing |
| Als | ≥0.015% | Deoxidation, grain refinement |
| Nb | 0.02–0.05% | Microalloying strengthening |
| V | 0.05–0.10% | Controlled rolling to enhance strength and toughness |
| Ti | ≤0.02% | Nitrogen fixation and grain refinement |
| Ni | ≤0.40% | Improves low-temperature impact toughness |
| Cu | ≤0.35% | Slightly improves resistance to seawater corrosion |
| Cr | ≤0.20% | Trace control |
| Mo | ≤0.08% | Trace control |
Carbon Equivalent: CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
| Thickness (mm) | 5 - 50 | 50 - 150 |
|---|---|---|
| Typical CEV (wt %) | ≤ 0.38 | ≤ 0.40 |
III. Mechanical Properties
Tensile Test
| Yield Strength (ReH), MPa | Tensile Strength (Rm), MPa | Elongation (A), % |
|---|---|---|
| ≥ 355 | 490 - 630 | ≥ 21 |
Charpy (V-notch) Impact Test
| Thickness, mm | Temperature, ℃ | Impact Energy, KV2 / J | |
|---|---|---|---|
| Longitudinal | Transverse | ||
| ≤ 50 | - 40 | ≥ 34 | ≥ 24 |
| > 50 - 70 | - 20 | ≥ 41 | ≥ 27 |
| > 70 - 150 | - 20 | ≥ 50 | ≥ 34 |
IV. Common Delivery Conditions
1) Thermomechanically Controlled Process (TMCP)
The mainstream delivery condition, featuring fine grain structure, optimal low-temperature toughness, and low carbon equivalent; the preferred choice for thick plates.
2) Normalized (N)
Z-direction properties (Z15/Z25/Z35) can be provided upon request.
V. Core Characteristics
1) Ultra-low-temperature toughness
Maintains high impact resistance at -40°C; mandatory material for polar regions, LNG facilities, and ice-class vessels.
2) Excellent weldability
Low carbon and low carbon equivalent; suitable for submerged arc welding, gas shielded welding, and manual arc welding; low risk of cold cracking in thick plates.
3) High Strength and Lightweight
Approximately 50% higher strength than standard marine steel grades A, B, D, and E; allows for reduced plate thickness and lower hull weight while maintaining equivalent load-bearing capacity.
4) Excellent Adaptability to Marine Environments
Produced via clean steel smelting, it offers outstanding resistance to fatigue and alternating wave loads.
VI. Typical Applications
1) Shipbuilding
Polar research vessels, icebreakers, and bulk carriers, oil tankers, and container ships operating in ice-covered waters; heavy-duty decks, outer side plating, ship bottoms, crane bases, and hatch coamings.
2) Offshore Engineering
Jack-up platforms, columns, deck modules, wind turbine foundations, and offshore lifting structures.
3) Specialized Equipment
Large port machinery, offshore crane vessels, and structural components for LNG carriers.
VII. Relevant Standards and Certifications
Classification Societies: DNV (Det Norske Veritas) factory certification; compatible with classification certificates from CCS, ABS, BV, LR, and other international bodies.
Corresponding Chinese National Standard: GB/T 712 EH36
Corresponding U.S. Standard: ASTM A131 Grade EH36
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