LR shipbuilding steel is a type of steel that meets the inspection standards of Lloyd’s Register (LR), one of the most prestigious maritime classification societies in the world. LR steel is widely used in the shipbuilding industry and marine structures due to its durability, corrosion resistance and meeting strict safety standards.
1. Introduction to LR-Certified Shipbuilding Steel: AH36, DH36, EH36
AH36, DH36, and EH36 steel grades comply with LR (Lloyd’s Register – UK) standards. Used in global ships and offshore rigs. LR can test EH36 at -50°C if required. Available in plate, bulb flat, and angle bar forms. Ensures performance under extreme conditions.
2. Technical Properties and LR Requirements
2.1. Mechanical Properties
Yield strength: 355 MPa; tensile strength: 490–620 MPa. Toughness: 34J at lowest test temperatures. LR allows EH36 testing at -50°C for special applications. Ensures steel withstands heavy loads effectively.
2.2. Chemical Composition
LR applies Niobium and Vanadium (0.02–0.05%) to enhance toughness. Suitable for thick steel and large offshore platforms. Increases load-bearing capacity by 10–15%.
Summary Table – LR Properties
| Steel Grade | Yield Strength (MPa) | Niobium/Vanadium (%) | Test Temperature (°C) | LR Features |
|---|---|---|---|---|
| AH36 | 355 | Not required | 0 | As-rolled |
| DH36 | 355 | Not required | -20 | Optional TMCP |
| EH36 | 355 | 0.02 – 0.05 | -40 (optional -50) | TMCP, tested at -50°C |
3. LR Shipbuilding Steel Sizes
Steel Plates
Thickness: 5–150mm, Width: 1,500–3,000mm, Length: 6,000–12,000mm. LR recommends TMCP for greater thickness. Used for hulls and offshore platforms.
Bulb Flats
Thickness: 3–50mm, Width: 20–250mm, Length: 6,000–12,000mm. Suitable for structural ship frames.
Angle Bars
Leg: 20–200mm, Thickness: 3–20mm, Length: 6,000–12,000mm. Reinforces structural corners in offshore rigs.
LR Steel Size Chart
| Steel Type | Thickness (mm) | Width/Leg (mm) | Length (mm) | Main Application |
|---|---|---|---|---|
| Plate AH36 | 6 – 100 | 1,500 – 3,500 | 6,000 – 12,000 | Hulls, decks |
| Bulb Flat DH36 | 5 – 30 | 40 – 430 | 6,000 – 12,000 | Light cold framing |
| Angle Bar EH36 | 3 – 20 | 30 – 250 | 6,000 – 12,000 | Extreme cold reinforcement |
4. Applications and Benefits of LR
Real-World Applications
AH36 is used for cargo ships in tropical zones. DH36 is suitable for oil tankers in mildly cold regions. EH36 is ideal for offshore platforms and polar vessels.
Benefits of LR Steel
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Testing at -50°C improves cold region safety by 25%.
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Niobium and Vanadium enhance the durability of thick steel.
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LR is optimized for heavy-load applications.
LR Application Table
| Steel Grade | Main Application | Operating Zone | LR Advantage |
|---|---|---|---|
| AH36 | Cargo ships, containers | Warm seas | Affordable, standard strength |
| DH36 | Oil tankers | Mild cold (-20°C) | Stable toughness |
| EH36 | Offshore rigs, icebreakers | Extreme cold (-40/-50°C) | Heavy-load resistance, cold safety |
5. Where to Buy High-Quality LR Shipbuilding Steel?
✅ Certified by ABS, BV, DNV, and LR for guaranteed quality.
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✅ Free technical consultation – Competitive pricing.
📞 Contact for Consultation & Quotation Now
📞 Hotline: +84 908 445 224
📧 Email: sales@vietacnc.com.vn
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