Characteristics and Advantages of BV Grade EH36 Marine Structural Steel Plates
- Aug 20, 2026
Knowledge
Complete Technical Specifications for BV Grade DH32 Shipbuilding Steel Plates
1. Product Overview
BV Grade DH32 is a high-strength hull structural steel plate certified by Bureau Veritas (BV), a French classification society, and belongs to the DH series of high-strength, high-toughness ship plates. This product features high yield strength, excellent low-temperature impact toughness, and good weldability and cold workability. It is suitable for critical load-bearing areas such as ship main hull structures, offshore engineering platforms, and large welded components.
2. Applicable Standards
| Item | Technical Requirements |
|---|---|
| Steel Grade | BV DH32 |
| Standard System | BV Rules for Classification of Steel Ships |
| Product Type | High-strength steel plates for ship hull structures |
| Production Standard | Classification society-approved standards |
| Certification | BV certification (third-party inspection available) |
| Equivalent Grades | LR DH32, ABS DH32, NV D32, CCS DH32, etc. |
3. Chemical Composition
| Elements | Content (%) |
|---|---|
| C | ≤ 0.18 |
| Si | ≤ 0.50 |
| Mn | 0.90 - 1.60 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
| Cu | ≤ 0.35 |
| Cr | ≤ 0.20 |
| Ni | ≤ 0.40 |
| Nb | 0.02 - 0.05 |
| V | 0.05 - 0.10 |
| Ti | ≤ 0.02 |
| Mo | ≤ 0.08 |
| Als | ≥ 0.015 |
4. Carbon Equivalent (CE)
Typical calculation formula:
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
| Thickness | CEV |
|---|---|
| 5 - 50 mm | ≤ 0.36 % |
| 50 - 150 mm | ≤ 0.38 % |
* Used to evaluate weldability.
5. Mechanical Properties
1) Tensile Properties
| Item | Requirements |
|---|---|
| Yield Strength, ReH | ≥ 315 MPa |
| Tensile Strength, Rm | 450 - 570 MPa |
| Elongation, A | ≥ 22 % |
2) Impact Properties
Charpy V-notch impact test:
| Thickness | Impact Temperature | Impact Energy |
|---|---|---|
| t ≤ 50 mm | - 20 °C | ≥ 31 J |
| 50 < t ≤ 70 mm | - 20 °C | ≥ 38 J |
| 70 < t ≤ 100 mm | - 20 °C | ≥ 46 J |
6. Delivery Conditions
| Delivery Conditions | Description |
|---|---|
| AR | As-rolled |
| CR | Controlled Rolling |
| TMCP | Thermo-Mechanical Control Process |
| N | Normalized |
| Q&T | Quenched and Tempered (for some thick plates) |
* Thickness ≤ 35 mm: CR / TMCP
Heavy plates: N or TMCP
7. Dimensions
Common supply ranges:
| Item | Range |
|---|---|
| Thickness | 4 - 260 mm |
| Width | 1200 - 4000 mm |
| Length | 3000 - 18000 mm |
Actual dimensions are subject to the steel mill’s capabilities and the scope of BV certification.
Common Specifications:
| Thickness (mm) | Width × Length (mm) |
|---|---|
| 6 | 1500 × 6000 |
| 8 | 2000 × 8000 |
| 10 | 2500 × 12000 |
| 12 | 2500 × 12000 |
| 16 | 3000 × 12000 |
| 20 | 3000 × 12000 |
| 25 | 3000 × 12000 |
| 30 | 3000 × 12000 |
| 40 | 3000 × 12000 |
8. Surface Quality Requirements
Must comply with classification society requirements for ship plates:
1) The surface must be free of cracks;
2) Delamination is not permitted;
3) Folds or knots that affect serviceability are not permitted;
4) Localized defects must be ground and repaired.
Common Surface Conditions upon Delivery: Black plate, sandblasted plate, or plate with shop primer.
Sandblasting Grade: Sa 2.5
Shop Primer: Approximately 20 - 25 μm (as specified in the contract)
9. Non-Destructive Testing Requirements
In accordance with BV and contract requirements, the following may be performed:
1) UT Ultrasonic Testing
2) Z-direction performance testing (Z25/Z35, if required)
3) Surface inspection
10. Welding Performance
Recommended welding methods:
1) Manual Metal Arc Welding (SMAW)
2) Submerged Arc Welding (SAW)
3) Flux-Cored Arc Welding (FCAW)
4) Gas Metal Arc Welding (GMAW)
Welding Precautions:
1) Preheat thick plates in low-temperature environments
2) Control heat input
3) Use welding consumables approved by classification societies
Recommended welding consumables:
) AWS E7018 series
2) High-strength welding wire approved by classification societies
11. Major Applications
Ships: Container ships, oil tankers, bulk carriers, large fishing vessels;
Offshore Engineering: Offshore platforms, lifting platforms, offshore wind turbine foundations.
Marine Infrastructure: Port collision protection systems, ship mooring facilities, heavy-duty marine guardrails, steel structures for breakwaters.
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