5083 h112 aluminum plate

Marine environments impose extreme demands on materials – repeated wave slamming, floating debris impacts, long‑term seawater exposure, and cryogenic temperatures down to –162°C for LNG storage. Any single factor can push ordinary metals to failure. When these factors combine, material selection becomes a critical decision for safety and service life. 5083 H112 aluminum plate is engineered specifically to handle these challenges.

What Does H112 Mean, and How Does It Relate to Impact Toughness?

Understanding the value of this product starts with the temper designation H112.

H112 indicates a hot‑worked condition. In simple terms, the plate is formed primarily by hot rolling and achieves its specified mechanical properties without requiring additional heat treatment after forming.

This condition delivers one key outcome: a good balance between strength and toughness.

- Strength – Tensile strength falls in the range of 270–320 MPa, yield strength 125–165 MPa, and elongation after fracture is not less than 12%.

- Toughness – The H112 temper avoids the toughness loss caused by excessive cold working. It retains excellent plasticity and impact toughness, making it suitable for components that require welding or complex forming.

> The H112 temper does not chase maximum strength; it prioritises a balanced performance profile.

Why Impact Toughness Matters in Marine Environments

The importance of impact toughness in marine applications can be summarised in three practical aspects:

- Retains toughness at low temperatures – LNG tanks and polar‑route vessels face extreme cold. The face‑centred cubic crystal structure of 5083 alloy prevents brittle transition at low temperatures, so impact toughness remains stable even in cryogenic conditions.

- Absorbs energy under dynamic impacts – Hulls are constantly struck by waves and floating objects. High‑toughness materials effectively absorb impact energy and prevent crack propagation.

- Performance does not degrade in corrosive seawater – The aluminium‑magnesium alloy forms a dense oxide layer that resists chloride attack, ensuring that impact toughness does not drop significantly after long‑term immersion.

In short, impact toughness is a critical safeguard for marine structures under the combined stresses of low temperature, impact, and corrosion – it ensures that the material will not fail suddenly under extreme conditions.

H112 vs. H116 vs. H321 – How Do They Compare?

Comparisons are often made between these three tempers. The table below highlights their key differences:

The main advantage of H112 is that it offers better impact toughness and formability than H116 and H321, while still providing significantly higher strength than the fully annealed O temper.

For parts that require welding, hot forming, or need to withstand impact loads, H112 is often the preferred choice. For areas where maximum strength is the primary requirement and forming is less demanding, H116 or H321 may be considered.

Typical Applications of 5083 H112 Plates

This product is widely used across several sectors:

- Shipbuilding and offshore engineering – hull shells, decks, bulkheads, superstructures, and offshore wind platforms

- LNG and cryogenic equipment – LNG storage tanks, chemical storage vessels, air separation units

- Transport – tanker trucks, rail freight cars, vehicle body frames

- Other fields – offshore platform protective structures, corrosion‑resistant equipment

In ship construction, the density of 5083 aluminium is about one‑third that of steel, which significantly reduces hull weight and improves fuel efficiency and payload capacity.

Specifications and Certifications

Qualified marine‑grade 5083 H112 plates are normally certified by major classification societies – including CCS, DNV, ABS, LR, and BV. These certifications confirm that the material has passed rigorous tests for chemical composition, mechanical properties, impact toughness, and corrosion resistance.

Standard size ranges:

- Thickness – from 0.15 mm up to 600 mm (common marine thickness: 3–200 mm)

- Width – up to 2650 mm

- Length – can be customised according to project requirements

Applicable specifications include GB/T 3880, ASTM B209, and EN AW‑5083.

*We focus on the supply of high‑quality aluminium plates and coils, and we do not offer surface treatment or secondary processing – our commitment is to the intrinsic performance and reliability of the base material.*

Henan Mingtai Al provides a complete range of 5083 H112 plates with full classification society approvals, backed by stable production capacity and stringent quality control – ready to support your marine engineering projects with dependable material performance.

FAQ

Q1: What is the Charpy impact energy of 5083 H112 at low temperatures?  

A: At –196°C, the Charpy V‑notch impact energy meets or exceeds standard requirements, ensuring reliable cryogenic performance.

Q2: What is the main difference between 5083 H112 and 5083 H116?  

A: H112 offers higher impact toughness and better formability, whereas H116 provides greater strength and superior exfoliation corrosion resistance.

Q3: Is 5083 H112 suitable for LNG storage tanks?  

A: Yes, its proven cryogenic toughness makes it a reliable choice for LNG tank inner liners and shells.

Q4: What thicknesses are commonly available for marine applications?  

A: Typical marine thicknesses range from 3 mm to 200 mm, with broader availability from 0.15 mm to 600 mm.

Q5: Does welding require post‑weld heat treatment?  

A: No, 5083 is a non‑heat‑treatable alloy; welded joints perform well without additional heat treatment.