ABS FQ47 Shipbuilding
ABS FQ47: Ultra-High Strength Quenched & Tempered Steel for Shipbuilding
Detailed data for ABS Grade FQ47 shipbuilding steel including chemical composition, mechanical properties, thermal properties, equivalent grades, and typical applications in marine engineering.
Quenching and tempering (Q+T), hot rolling prior to heat treatment, followed by cutting, forming, welding, and machining
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ABS FQ47 Shipbuilding Introduction
ABS Grade FQ47 is a premium quenched and tempered high-strength structural steel plate governed by the American Bureau of Shipping (ABS) rules for shipbuilding and offshore structures. It belongs to the 47 kgf/mm2 class with a minimum yield strength of 460 MPa, providing exceptional strength-to-weight ratio. The F designation guarantees Charpy V-notch impact toughness at -60°C, ensuring reliable performance in arctic and cold-service conditions.
- Key features: High strength, excellent weldability, good toughness at low temperatures, and formability.
- Typical uses: Primary hull structures, decks, bottom shells, longitudinal stiffeners, and offshore platform components.
ABS FQ47 Shipbuilding Chemical Composition
The chemical composition of ABS FQ47 is carefully controlled to achieve the required mechanical properties and weldability. The steel is fine‑grain treated with elements like Nb, V, Ti, and Al. Carbon equivalent (CEV) limits apply as per ABS rules to ensure good weldability. All values are maximum unless a range is indicated.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18% | Maximum |
| Manganese (Mn) | 0.90 - 1.60% | |
| Silicon (Si) | ≤0.55% | |
| Phosphorus (P) | ≤0.035% | |
| Sulfur (S) | ≤0.035% | |
| Chromium (Cr) | ≤0.20% | |
| Nickel (Ni) | ≤0.40% | |
| Molybdenum (Mo) | ≤0.08% | |
| Copper (Cu) | ≤0.35% | |
| Niobium (Nb) | ≤0.05% | |
| Vanadium (V) | ≤0.10% | |
| Titanium (Ti) | ≤0.02% | |
| Aluminium (Al total) | ≥0.020% | |
| Nitrogen (N) | ≤0.012% | |
| Boron (B) | ≤0.0005% | Optional, when added |
ABS FQ47 Shipbuilding Thermal and Electrical Physical Properties
The following physical properties are typical for quenched and tempered structural steels at room temperature and elevated temperatures. They can vary slightly depending on the exact chemical composition and heat treatment condition. These values are useful for heat transfer analysis, structural simulations, and electrical resistivity calculations.
| Property | Typical Value | Unit | Reference Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20°C |
| Modulus of Elasticity (E) | 205 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | Calculated, approx. |
| Poisson's Ratio (ν) | 0.3 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶ /K | 20°C to 100°C |
| Thermal Expansion Coefficient (α) | 12.2 | 10⁻⁶ /K | 20°C to 200°C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶ /K | 20°C to 300°C |
| Thermal Conductivity (λ) | 46 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.20 | μΩ·m | At 20°C |
ABS FQ47 Shipbuilding Mechanical Properties
The mechanical properties are determined from test pieces taken in the delivery condition (quenched and tempered). The values below are the minimum requirements according to ABS Rules, unless otherwise stated. Thickness ranges influence the yield strength, elongation, and bend test diameter. Impact test is performed on Charpy V‑notch specimens at -60°C for grade F.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥460 | MPa | Plate thickness ≤ 50 mm |
| Yield Strength (ReH) | ≥440 | MPa | Plate thickness > 50 mm and ≤ 100 mm |
| Tensile Strength (Rm) | 570 - 720 | MPa | Plate thickness ≤ 100 mm |
| Elongation (A) | ≥17 | % | Gauge length 5.65√So, thickness ≤ 100 mm |
| Charpy Impact (KV) | ≥46 (longitudinal) | J | -60°C, thickness ≤ 50 mm |
| Charpy Impact (KV) | ≥46 (longitudinal) | J | -60°C, thickness > 50 to 70 mm |
| Charpy Impact (KV) | ≥46 (longitudinal) | J | -60°C, thickness > 70 to 100 mm |
| Bend Test (180°) | D=3t (t ≤ 25 mm) | No cracks after bending | |
| Bend Test (180°) | D=4t (25 < t ≤ 50 mm) | No cracks after bending | |
| Bend Test (180°) | D=5t (50 < t ≤ 100 mm) | No cracks after bending |
ABS FQ47 Shipbuilding Fully Equivalent Material Standards and Substitute Grade Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International / USA | ABS | FQ47 | Reference grade |
| Norway / Germany | DNV GL | E47 | Quenched & tempered; YS 460 MPa; CVN -40°C (F option to -60°C) |
| UK | LR | EH47 | Equivalent, Charpy at -40°C (F grade at -60°C) |
| France | BV | EH47 | Equivalent |
| China | CCS | FH47 | Equivalent |
| South Korea | KR | EH47 | Equivalent |
| Japan | NK | KE47 | Equivalent |
| Italy | RINA | E47 | Equivalent |
ABS FQ47 Shipbuilding Application Introduction
ABS FQ47 steel is engineered for critical load-bearing structures in marine and offshore environments, where high strength and low-temperature toughness are paramount. Its superior weldability and formability enable complex fabrication for modern ships and platforms.
Product Applications: Hull plates, Deck plates, Bottom plates, Shell plating, Longitudinal stiffeners, Transverse frames, Bulkheads, Jack-up rig legs, Spud cans, Crane pedestals
Processed into products: Ship hull panels, Stiffened panels, Girder webs and flanges, Deck girders, Hatch coamings, Offshore module structural beams, Pile sleeves, Bracket plates
Application industries: Shipbuilding and Ship Repair, Offshore Oil & Gas, Arctic Engineering, Port and Harbor Construction, Bridges and Civil Structures
ABS FQ47 Shipbuilding Similar / Comparable Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6:2019 | S460Q (1.8908) | Quenched & tempered; YS ≥460 MPa, impact -20°C (can be specified to -40°C or -60°C) |
| Europe | EN 10025-6:2019 | S460QL (1.8907) | Low-temperature variant, CVN -40°C / -50°C |
| China | GB/T 16270-2009 | Q460F | Quenched & tempered; YS ≥460 MPa, impact -40°C |
| USA | ASTM A514/A514M | Grade Q | Higher strength (YS ≥690 MPa) Q&T steel, often considered for heavy structural applications |
Notes:
For welding, preheating and controlled heat input are recommended to avoid hydrogen cracking. PWHT (post-weld heat treatment) is generally not required but may be applied when necessary. For thicknesses greater than 70 mm, special approval may be needed. Always refer to the latest ABS rules and material certificates.
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