ABS Grade DH40 Shipbuilding Steel Coil
ABS Grade DH40 Shipbuilding Steel Coil: High-Strength Marine Structural Steel
Explore the properties, chemical composition, and applications of ABS Grade DH40 shipbuilding steel coil, a high-strength structural steel designed for marine environments.
Hot rolling, cold rolling, cutting, welding, forming, bending
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ABS Grade DH40 Shipbuilding Steel Coil Introduction
ABS Grade DH40 is a high-strength shipbuilding structural steel certified by the American Bureau of Shipping. It delivers a minimum yield strength of 390 MPa and excellent toughness at -20°C, making it ideal for critical marine components. The steel is produced as hot-rolled coil, plate, or strip and is typically supplied in normalized or thermo-mechanically controlled processed (TMCP) condition.
- High strength-to-weight ratio for efficient design
- Good weldability with low carbon equivalent
- Excellent low-temperature impact toughness
- Compliance with major classification society rules (IACS members)
ABS Grade DH40 Shipbuilding Steel Coil Chemical Composition
The chemical composition of ABS DH40 steel is tightly controlled to ensure weldability, strength, and low-temperature toughness. Maximum limits are given unless a range is specified. Microalloying elements such as niobium, vanadium, and titanium are added singly or in combination to achieve the required mechanical properties.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.18 max | - |
| Manganese (Mn) | 0.90 - 1.60 | Range |
| Silicon (Si) | 0.10 - 0.50 | Range |
| Phosphorus (P) | 0.035 max | - |
| Sulfur (S) | 0.035 max | - |
| Chromium (Cr) | 0.20 max | - |
| Nickel (Ni) | 0.40 max | - |
| Molybdenum (Mo) | 0.08 max | - |
| Copper (Cu) | 0.35 max | - |
| Niobium (Nb) | 0.02 - 0.05 | Microalloying |
| Vanadium (V) | 0.05 - 0.10 | Microalloying |
| Titanium (Ti) | 0.02 max | Microalloying |
| Aluminum (Al) | 0.015 min | Total aluminum, grain refinement |
ABS Grade DH40 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
The following physical properties are typical for low-alloy structural steels and are provided for reference at room temperature (20°C) unless stated otherwise. These values are not mandatory requirements but aid in design and simulation.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.3 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20-100°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 20°C |
| Specific Heat Capacity (c) | 480 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.22 | µΩ·m | At 20°C |
ABS Grade DH40 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties are determined by tensile and impact testing in accordance with ABS Rules. Requirements vary with product thickness; the values below are valid for thickness ≤50 mm in the transverse direction (unless noted). Bend test condition: 180° bend over a mandrel of diameter 3a (a = sample thickness) without cracking.
| Property | Minimum / Range Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 390 | MPa | Thickness ≤ 100 mm, transverse |
| Tensile Strength (Rm) | 510 - 650 | MPa | Thickness ≤ 100 mm |
| Elongation (A5) | 20 | % | Gauge length 5.65√So, thickness ≤ 100 mm |
| Bend Test (Mandrel Diameter) | 3a (no cracks) | - | 180° bend, a = specimen thickness |
| Impact Energy (KV2) at -20°C, longitudinal | 31 (avg) / 22 (min single) | J | Charpy V-notch, -20°C |
| Impact Energy (KV2) at -20°C, transverse | 24 (avg) / 17 (min single) | J | Charpy V-notch, -20°C |
ABS Grade DH40 Shipbuilding Steel Coil Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ASTM A131 / A131M | DH40 | Identical chemical and mechanical requirements |
| International | IACS UR W11 | DH40 | Harmonized class society standard |
| United Kingdom | Lloyd's Register | LR DH40 | Equivalent shipbuilding grade |
| Norway/Germany | DNV | D40 | DNV equivalent to DH40 |
| France | Bureau Veritas | BV DH40 | Equivalent grade |
| China | China Classification Society | CCS DH40 | Equivalent grade |
| South Korea | Korean Register | KR DH40 | Equivalent grade |
| Japan | ClassNK | NK DH40 | Equivalent grade |
| Italy | RINA | RINA DH40 | Equivalent grade |
| Russia | Russian Maritime Register | RS D40 | Equivalent grade |
ABS Grade DH40 Shipbuilding Steel Coil Application Introduction
ABS DH40 steel coil is a workhorse material for modern shipbuilding and offshore engineering. Its balanced combination of strength, ductility, and low-temperature toughness makes it suitable for highly stressed hull structures and operating in cold seawater environments.
Product Applications: Hull plates, Decks and bulkheads, Stiffeners and frames, Offshore platform modules, Jack-up rig legs, Transition pieces for wind turbines
Processed into products: Ship frames and longitudinals, Bottom and side shell plates, Watertight bulkheads, Deck stringers, Helicopter decks, Mooring components, Padeyes and lifting lugs
Application industries: Shipbuilding, Offshore oil and gas, Marine engineering, Port and harbor construction, Renewable energy (offshore wind turbine foundations)
ABS Grade DH40 Shipbuilding Steel Coil Similar / Near-Equivalent Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-3 | S420N/NL | Similar yield strength (420 MPa), N: -20°C impact, NL: -50°C. Different delivery condition norms. |
| European Union | EN 10025-4 | S420M/ML | Thermo-mechanical rolled, similar strength. Not specifically a shipbuilding grade. |
| China | GB/T 712 | DH40 | Chinese shipbuilding steel standard, essentially equivalent to ABS DH40. |
| Japan | JIS G 3106 | SM520C | Higher tensile strength range, -0°C impact requirement. |
| Australia/New Zealand | AS/NZS 3678 | WR350 | Weather-resistant steel, not direct substitute. |
Notes:
ABS DH40 steel can be additionally certified for through-thickness properties (Z-grade) or fracture toughness (CTOD). For improved weldability, carbon equivalent (CEV) limits are often negotiated. Typical delivery conditions are hot rolled, normalized, or TMCP. Consult the material certificate for exact condition and test results.
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