5456-H116; 5456-H321 Aluminum alloy,Aluminum 5456-H116; 5456-H321 alloy,E FORU

# 5456-H116 / 5456-H321 Aluminum Alloy Technical Datasheet ## Material Overview 5456-H116 and 5456-H321 are specialized tempers of the 5456 aluminum-magnesium alloy, designed for superior performance in marine and structural applications. The H116 temper provides enhanced corrosion resistance for marine environments, while H321 indicates stabilization by controlled stretching after strain hardening. Both tempers offer excellent strength and durability for demanding applications. --- ## 1. Chemical Composition (Weight %) | Element | Composition Range | |---------|-------------------| | Aluminum (Al) | Balance | | Magnesium (Mg) | 4.7 - 5.5 | | Manganese (Mn) | 0.50 - 1.0 | | Chromium (Cr) | 0.05 - 0.20 | | Iron (Fe) | ≤ 0.40 | | Silicon (Si) | ≤ 0.25 | | Copper (Cu) | ≤ 0.10 | | Zinc (Zn) | ≤ 0.25 | | Titanium (Ti) | ≤ 0.20 | | Other Elements (Each) | ≤ 0.05 | | Other Elements (Total) | ≤ 0.15 | --- ## 2. Physical Properties | Property | Value | |----------|-------| | Density | 2.66 g/cm³ | | Melting Range | 570 - 640 °C | | Electrical Conductivity | 28-32% IACS | | Thermal Conductivity | 117 - 127 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | 24.0 × 10⁻⁶/°C | | Modulus of Elasticity | 70 GPa | | Specific Heat Capacity | 900 J/kg·K | --- ## 3. Mechanical Properties | Property | 5456-H116 | 5456-H321 | |----------|-----------|-----------| | Tensile Strength (MPa) | 310 - 360 | 320 - 370 | | Yield Strength (MPa) | 150 - 190 | 160 - 200 | | Elongation (%) | 14 - 18 | 12 - 16 | | Hardness (Brinell) | 80 - 90 | 85 - 95 | | Shear Strength (MPa) | 180 - 210 | 185 - 215 | | Fatigue Strength (MPa) | 130 - 150 | 135 - 155 | --- ## 4. Technical Applications ### 5456-H116 Applications: - Marine hull plates and structures - Offshore platform components - Shipbuilding applications - Marine pressure vessels - Saltwater immersion applications ### 5456-H321 Applications: - Aerospace structural components - Military vehicle armor - High-stress marine structures - Pressure vessel construction - Critical structural applications --- ## 5. International Standards Compliance | Standard Organization | Designation | |----------------------|-------------| | Aluminum Association | AA 5456-H116/H321 | | ASTM International | ASTM B928/B928M | | European Standards | EN AW-5456 H116/H321 | | International Standards | ISO 6361-2 | | Military Standards | MIL-DTL-46027 | --- ## 6. Material Characteristics ### Common Advantages: - High strength-to-weight ratio - Excellent marine corrosion resistance - Superior stress corrosion cracking resistance - Good weldability with minimal strength loss - Excellent cryogenic properties - Enhanced fatigue performance ### Temper-Specific Features: **5456-H116:** - Enhanced exfoliation corrosion resistance - Superior performance in saltwater immersion - Better resistance to marine atmospheric corrosion - Improved long-term durability in marine environments **5456-H321:** - Controlled stretching for stress relief - Improved dimensional stability - Better flatness characteristics - Reduced residual stresses - Enhanced mechanical consistency --- ## 7. Processing Characteristics ### Manufacturing Considerations: - **Welding Technology** - Excellent weldability using MIG and TIG processes - Recommended filler metals: ER5356, ER5183 - Minimal strength loss in heat-affected zone - Good weld metal mechanical properties - **Forming Operations** - Moderate formability characteristics - Suitable for cold bending and forming - Requires proper tooling and techniques - Predictable springback behavior - **Machining** - Good machinability with sharp tools - Requires adequate cooling and lubrication - Produces acceptable surface finish - Suitable for precision machining operations --- ## 8. Quality Assurance ### Testing & Certification: - Mechanical property verification - Chemical composition analysis - Corrosion testing per ASTM G67 and G66 - Ultrasonic testing for internal quality - Dimensional accuracy inspection - Mill test certificates per EN 10204 3.2 ### Special Testing Requirements: - Exfoliation corrosion testing - Stress corrosion cracking evaluation - Fracture toughness testing - Weld procedure qualification --- ## Technical Note 5456-H116 and 5456-H321 Aluminum Alloys represent premium marine-grade aluminum solutions with specialized thermal-mechanical processing. The H116 temper provides exceptional corrosion resistance for marine immersion applications, while the H321 temper offers enhanced dimensional stability and stress relief for critical structural components. Both tempers maintain the excellent strength and weldability characteristics of the 5456 alloy system, making them particularly valuable for naval architecture, offshore structures, and aerospace applications where reliability, durability, and long-term performance are essential requirements. Their proven performance in demanding service conditions has established these materials as preferred choices for advanced engineering applications worldwide.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1910 gallon liquid totes Special package is available on request.