5083 5383 Marine Grade Aluminium Hex Bar

Why choose Haomei marine grade 5083 5383 aluminum hex bar?

The 5083 and 5383 aluminum hex bars produced by Haomei comply with multiple international and industry standards to ensure product quality and performance meet global application requirements.

Haomei Aluminum is committed to providing high-quality aluminum materials for marine engineering, shipbuilding, and marine equipment. Our products feature stable performance and reliable quality, and have obtained certifications from multiple internationally recognized classification societies, ensuring the trust and recognition of customers worldwide.

We have been certified by the following international classification societies:

DNV (Det Norske Veritas)
CCS (China Classification Society)
ABS (American Bureau of Shipping)
BV (Bureau Veritas)
LR (Lloyd’s Register)
KR (Korean Register of Shipping)

Standard Specification for Haomei 5083 5383 Aluminum Hex Bar

ASTM Standards: Mainly comply with ASTM B221 (Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, and Profiles) and ASTM B209 (Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate).
EN Standards: Conform to EN 485-2 (Aluminum and Aluminum Alloys - Chemical Composition and Mechanical Properties of Products) and EN 755 (Aluminum and Aluminum Alloys - Extruded Rods, Bars, Tubes, and Profiles).
Chinese National Standards: Comply with GB/T 3190 (Chemical Composition of Wrought Aluminum and Aluminum Alloys) and GB/T 6892-2023 (Extruded Profiles for General Industrial Applications of Aluminum and Aluminum Alloys).
Classification Society Certifications: Haomei’s 5083 and 5383 marine aluminum hex bars have also obtained certifications from the China Classification Society (CCS) and Det Norske Veritas (DNV).

Specifications for marine grade 5083 5383 aluminum hexagon bar

Alloy	5083 5383
Temper	O, H112
Maximum inscribed circle diameter	200 mm
Length	1000mm-12000mm or according to customer requirements

Dimensional Tolerances of 5083 5383 Aluminum Hexagon Bar

Across Flats Tolerance

For hex bars with across flats ≤ 50mm, the standard tolerance is ±0.50mm, while the precision grade tolerance can reach ±0.40mm.
For hex bars with across flats in the range of 50–220mm, the tolerance increases with size.

Length Tolerance

For hex bars with a length ≤ 6m, the length tolerance is ±5mm.
When the length > 6m, the tolerance increases by ±1mm for each additional meter, but does not exceed ±20mm in total.

Recommendations for Choosing Between 5083 and 5383 Aluminum Hex Bars

General Marine Environment: For standard ship structures and marine applications, 5083-H116 aluminum hex bars are a cost-effective choice.
Harsh Marine Environment: For deep-sea environments, high salinity areas, or structures submerged in seawater for long periods, 5383-H116 aluminum hex bars are recommended.
Low-Temperature Environment: In low-temperature conditions (e.g., LNG storage tanks), both alloys perform well, but 5083 offers slightly better low-temperature toughness.
High Lightweight Requirements: For applications with strict weight limitations, 5383 aluminum hex bars offer an advantage due to their higher strength-to-weight ratio.

Chemical composition of marine grade 5083 5383 aluminum hexagon bar

Elements	Composition / %
Elements	5083	5383
Si	0-0.4	0-0.25
Fe	0-0.4	0-0.25
Cu	0-0.1	0-0.2
Mn	0.40-1.00	0.70-1.00
Mg	4.00-4.90	4.0-5.20
Cr	0.05-0.25	0-0.25
Zr	-	0-0.2
Zn	0-0.25	0-0.4
Ti	0-0.15	0-0.15
Al	Remainder	Remainder

Mechanical properties of marine grade 5083 5383 aluminum hex bar

Alloy	Temper	Inscribed circle diameter /mm	Tensile strength /(N/mm2)	Specified non-proportional tensile strength /(N/mm2)	Elongation after break /%
					A	A50 mm
			not less than
5083	O	≤12.50	270-350	110	-	14
		>12.50-200.00	270		12	-
	H112	≤12.50	270	125	-	12
		>12.50-200.00			12	-
5383	O	≤12.50	290	145	-	17
		>12.50-50.00			17	-
	H112	≤12.50	310	190	-	13
		>12.50-50.00			13	-

Characteristics of 5083 5383 Marine Aluminum Hexagon Bars

Corrosion Resistance of 5083 5383 Marine Aluminum Hexagon Bars

5083 and 5383 marine aluminum hexagon bars have excellent corrosion resistance, making them especially suitable for use in marine environments:

Seawater Corrosion Resistance: Both alloys exhibit outstanding resistance to seawater, salt spray, and marine atmosphere, far superior to conventional aluminum alloys. This is mainly due to the addition of magnesium, which forms a dense oxide film that prevents further corrosion.
Special Advantage of 5383: Compared with 5083, the 5383 alloy has undergone special testing and demonstrates significantly better corrosion resistance. According to ASTM G44 and G67 intergranular corrosion (IGC) and stress corrosion cracking (SCC) tests, 5383 shows superior corrosion resistance on both base metal and weld metal samples compared to standard 5083-H116.
Resistance to Exfoliation Corrosion: The 5383 alloy has been tested in accordance with ASTM B928 and shows no signs of exfoliation corrosion, which is critical for structures exposed to long-term marine environments.
Long-Term Corrosion Resistance: Accelerated aging and natural exposure tests confirm that 5383 has significantly better long-term corrosion resistance than 5083-H116/H321.

Mechanical Properties of 5083 5383 Marine Aluminum Hexagon Bars

5083 and 5383 marine aluminum hexagon bars offer excellent mechanical properties, meeting the high-strength demands of shipbuilding and marine engineering:

Strength Characteristics:

In the 5083-H116 temper, tensile strength is approximately 270–305 MPa, and yield strength is ≥215 MPa.
5383 alloy offers higher strength than 5083, especially in welded structures where strength retention is higher.
Elongation: About 10%–15% in 5083-H116; slightly lower in 5383-H116 but still maintains good ductility.
Hardness: Brinell hardness of 5083-H116 is approximately 70–80 HBW, and slightly higher in 5383-H116 at about 75–85 HBW.
Low-Temperature Performance: Both alloys maintain good mechanical properties at low temperatures, making them ideal for cold marine regions. At -40°C, the impact strength of 5083 improves by about 15% compared to room temperature.
Fatigue Strength: The impact strength of 5383 is approximately 10% higher than that of 5083, which is crucial for marine structures subject to cyclic loading.

Processing Properties of 5083 5383 Marine Aluminum Hexagon Bars

5083 and 5383 marine aluminum hexagon bars exhibit good processing performance, making them easy to manufacture and install:

Weldability:

Both alloys have good weldability and are among the most weldable in the aluminum-magnesium series.
Welding is recommended with 5356 or 5183 filler wire, and post-weld local annealing is suggested to relieve stress.
5383 has better welding performance than 5083, with higher strength retention in welded joints.

Cold Workability:

Good cold workability for stamping, bending, and other operations, but the degree of strain hardening must be controlled.
5083-H116 has better cold workability than H321 temper.

Hot Workability:

Suitable for hot stamping and hot forming; recommended forming temperature is 150–260°C.
For thick plates or deep drawing applications, hot stamping is preferred.

Machinability:

Moderate machinability; sharp tools and appropriate cutting parameters are required.
5383 has slightly better machinability than 5083, especially under high-speed cutting conditions.

Surface Treatment Performance:

Suitable for anodizing, chemical oxidation, painting, and other surface treatments to enhance corrosion resistance and aesthetics.
Anodizing enhances corrosion resistance but requires careful control of electrolyte temperature.

Applications of 5083, 5383 Marine Aluminum Hexagon Bars

5083 and 5383 marine aluminum hexagon bars are widely used in the marine and shipbuilding sectors due to their excellent corrosion resistance and mechanical properties:

Hull Structures:

Used in hull frames, deck beams, ribs, and other structural components, especially those in contact with seawater.
The 5383 alloy is especially suitable for high-strength welded areas such as hull corners and stress concentration zones.

Ship Superstructures:

Used in support structures, bulwarks, and partitions of ship superstructures.
5083-H116 hex bars are often used in open deck and superstructure components due to their good resistance to stress corrosion.

Ship Equipment Installation:

Used in support structures for masts, davits, railings, and other ship equipment.
Connectors and fasteners made from 5083 and 5383 hex bars are used in the installation and securing of ship equipment.

Offshore Platforms:

Used in structural supports and guardrails of offshore oil and wind power platforms.
5383 alloy is particularly suitable for deep-sea platform structures due to its higher strength and corrosion resistance.

Ship Repair and Retrofit:

Used in structural replacement and reinforcement during ship repair and modification.
5083-O hex bars are easy to process and form, making them ideal for on-site repair work.

Typical Marine Application Cases:

5383 aluminum alloy is used for ship sides, bottom outer plates, and decks, with a hardness of 45–75 HBW.
5083-H116 hex bars are used in deck support structures with tensile strength ≥270 MPa and yield strength ≥215 MPa.
5383 alloy is used in ship superstructures to reduce structural weight by about 15% while enhancing corrosion resistance.

Other Applications of 5083, 5383 Aluminum Hexagon Bars

In addition to marine and shipbuilding sectors, 5083 and 5383 aluminum hexagon bars are also widely used across various industries:

Transportation

Structural components of rail vehicle bodies, truck fuel tanks, and refrigerated truck containers (lightweight + corrosion resistance)
Automotive crash beams and fuel tanks (high energy absorption characteristics)
Floor supports and trim strips in railway vehicles

Pressure Vessels and Storage Tanks

LNG storage tanks, chemical liquid containers (good low-temperature toughness)
Beer brewing tanks, food-grade storage tanks (non-toxic surface treatment)
High-pressure gas storage vessels, working pressures over 30 MPa

Architecture and Infrastructure

Bridge structures and dock guardrails in marine environments
Roofs and curtain wall supports in high-humidity regions
Decorative lines and handrails in the architectural decoration sector

Aerospace

Aircraft structural components such as floor beams and frames (requires strict surface treatment).
Fuel tanks for spacecraft (requires strict surface treatment).
5083 alloy is used in aerospace mainly for its lightweight, high strength, and corrosion resistance.

Military and Special Equipment

Non-load-bearing components of armored vehicles, explosion-proof equipment enclosures, structural parts of marine monitoring devices and underwater robots, military equipment components in low-temperature environments such as liquid oxygen tank supports.

Industrial Equipment

Corrosion-resistant piping supports and structural components in chemical equipment.
Workbenches and supports in food and beverage processing equipment.
Yarn guides and support structures in textile machinery.

Typical Non-Marine Application Cases

5083-H116 hex bars are used in the support structures of LNG storage tanks, with operating temperatures down to -196°C.
5383 alloy is used in the floor supports of subway vehicles, reducing weight by about 20% while enhancing corrosion resistance.
5083-H112 hex bars are used in curtain wall support structures in buildings, with tensile strength ≥270 MPa and yield strength ≥215 MPa.

Selection Guide for 5083 5383 Marine Grade Aluminum Hexagon Bars

Alloy and Temper Selection

Choosing the right 5083 or 5383 marine grade aluminum hexagon bar requires consideration of the following factors:

Alloy	Applicable Environment	Features	Cost
5083	General marine environment	Good corrosion resistance and weldability	Relatively low
5383	Harsh marine environment	Higher strength and better corrosion resistance	About 15%–20% higher than 5083

Selection of temper should consider processing and usage requirements:

O Temper (annealed): Offers the highest ductility and lowest strength, easy for machining and forming. H112 Temper: Suitable for products that maintain a certain strength after hot or cold working. H116 Temper: Specifically designed for marine environments, with excellent stress corrosion resistance and corrosion resistance. H32 Temper: Suitable for general processing, with moderate strength and good corrosion resistance.

Dimensional Specification Selection

Choosing the appropriate dimensions is critical to ensuring product performance and reducing costs:

Across Flats Selection: Select appropriate across flats dimension based on load requirements. General rule: the greater the load, the larger the across flats size.
Length Selection: Prioritize standard lengths (e.g., 6m, 12m) to reduce cost.
Tolerance Grade Selection: For general structural parts, choose standard-grade tolerance; for precision mechanical parts, choose precision-grade tolerance.

Quality Grade and Certification Selection

Select the appropriate quality grade and certification to ensure the product meets usage requirements:

Quality Grade Selection: Choose standard, high-grade, or premium quality based on the importance of the application. Certification Selection: For marine applications, select products certified by classification societies; for pressure vessels, choose products compliant with ASME or GB standards.

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