8mm Hot Dip Galvanized Chain DIN766 Welded Marine Chain for Connection

Product Description:

Material Advantages:

The core material of this chain is low-carbon steel, typically Q235 or similar grade carbon structural steel, with a hot-dip galvanized surface treatment to improve corrosion resistance.

1. Base Material: Low-carbon Steel
The chain body is manufactured using low-carbon steel, a standard base material for DIN766 standard chains. The main reasons include:
* Excellent weldability: Low-carbon steel has a low carbon content (typically ≤0.25%), making it less prone to cracking during welding and meeting the strength requirements of "welded" structures.
* Strength suitability: The tensile strength and toughness of low-carbon steel such as Q235 match the load requirements of marine and general connection applications.
* Cost and processability balance: Low-carbon steel is easy to roll and bend, and its cost is lower than alloy steel, making it suitable for mass-produced basic hardware components like chains.

2. Surface Treatment: Hot-Dip Galvanizing

The "Hot-Dip Galvanizing" on the surface is not a material material, but an anti-corrosion treatment process. Its function is to form a uniform zinc alloy coating on the chain surface, isolating the steel from water and air, significantly improving its resistance to corrosion in seawater and humid environments, meeting the requirements of "marine" applications.

The coating has strong adhesion and better wear resistance than electroplating, able to withstand the friction and impacts of chain use.

Manufacturing Process:

1. Raw Material Preparation and Pretreatment
Select suitable low-carbon steel wire rod (e.g., Q235) with a diameter slightly larger than 8mm to allow for subsequent processing.

Surface treat the steel wire rod to remove oxide scale, oil, and other impurities to avoid affecting subsequent forming and welding quality.

Draw the steel wire rod to a standard diameter of 8mm using a wire drawing machine to ensure the dimensional accuracy of the chain material.

2. Chain Forming and Welding

Chain Braiding: Using specialized chain braiding equipment, bend the 8mm steel wire into "日" (sun) shaped chain links, controlling the inner width and length of the links according to DIN766 standards.

Welding: Use flash butt welding or resistance welding to weld the joints of each chain link to form a closed chain link. After welding, remove weld slag to ensure a smooth joint.

Shaping: Use shaping equipment to correct the shape and size of the chain links, ensuring smooth connection between adjacent links without deformation or jamming.

3. Heat Treatment and Strength Testing

Heat Treatment: The welded chain undergoes overall tempering treatment (e.g., annealing, quenching + tempering) to eliminate welding stress and improve the chain's tensile strength and toughness, meeting the load requirements of marine applications.

Tensile Testing: Randomly selected finished chains are subjected to tensile tests to verify whether their tensile strength and breaking load meet DIN766 standards. Unqualified products are rejected.

Appearance and Dimensional Inspection: The surface flatness and link dimensional deviations of each chain are inspected to ensure there are no defects such as cracks or dents.

4. Hot-Dip Galvanizing for Corrosion Protection

Pre-treatment: The chain surface is cleaned again to remove oil and rust, followed by pickling to remove rust. Finally, it is immersed in a flux to improve the adhesion of the zinc layer.

Hot-Dip Galvanizing: The chain is immersed in molten zinc at 440-460℃ to form a uniform and dense zinc alloy coating on the chain surface. The thickness must meet corrosion protection requirements (typically ≥85μm). Post-treatment: Remove the galvanized chain, cool it, and remove excess zinc nodules from the surface. If necessary, perform passivation treatment to further enhance corrosion resistance.

5. Finished Product Inspection and Packaging: Conduct a final inspection of the galvanized chain, including zinc layer adhesion (e.g., cross-cut test), appearance (no uncoated areas, peeling), and dimensional verification.

Inspected and qualified chains are wound and packaged to the specified length (e.g., 10 meters/coil), labeled with specifications, standards, production date, and other information, and prepared for shipment.

Features:

8mm hot-dip galvanized welded marine chains (DIN766 standard) feature high strength, corrosion resistance, and good adaptability. Here are the specific details:

- **High Strength and Reliability**

- **Superior Material**: Made of high-tensile carbon steel, such as grade 40 and grade 43, these chains possess high tensile strength, capable of withstanding significant tensile forces, meeting the strength requirements of marine anchor chains and similar applications.

- **Strong Welding**: The chains are connected using a welding process, ensuring reliable weld quality. Proof load testing guarantees the strength of each weld point, enabling it to withstand specified working loads and resist breakage.

- **Good Corrosion Resistance**: The chain surface undergoes hot-dip galvanizing, forming a thick zinc layer that effectively prevents rusting in humid and corrosive environments such as seawater, extending service life. Some products also utilize an enhanced solid zinc galvanizing treatment, further improving the coating thickness and adhesion, thus enhancing corrosion resistance.

- **Highly Compliant with Standards**

- **Standard Compliance**: Compliant with DIN 766 standards, the chain's dimensions and specifications are clearly defined, ensuring product quality and consistency, making it internationally universal and interchangeable.

- **Reasonable Design**: The chain features a short pitch design, providing better flexibility and smooth engagement with most metric windlass gypsies, preventing chain jamming and ensuring smoother and more reliable operation.

- **Clear Appearance and Markings**: The hot-dip galvanized layer on the chain surface has a good gloss and an attractive appearance. Additionally, embossed markings, such as "td 4," are printed every meter on the chain to indicate its grade and other information, facilitating user identification and inspection.

- **Moderate weight and size:** With an 8mm diameter and a weight of approximately 1.4kg per meter, the weight and size are moderate, making it easy to install and operate while providing sufficient strength and stability, suitable for a variety of shipbuilding and marine engineering scenarios.

Technical Parameters:

Applications:

The application areas of 8mm hot-dip galvanized welded marine chains (DIN766 standard) revolve around scenarios requiring **corrosion resistance + medium load capacity + standard compatibility**, primarily for marine applications, but also extending to similar terrestrial environments.

### 1. Core Applications: Shipbuilding and Marine Engineering
This is the original design intent of the chain, perfectly matching the needs of highly corrosive environments such as seawater and humidity.

- **Small Vessel Anchor Chains/Mooring Chains**: Suitable for small fishing boats, yachts, and workboats with a length of 20 meters or less. Used as anchor chains to connect anchors to the hull, or as mooring chains to secure the vessel to docks or buoys. The 8mm diameter and hot-dip galvanized corrosion resistance allow it to withstand the tension during anchoring and resist seawater corrosion.

- **Ship Equipment Securing**: Used for securing or limiting components such as pipes, ventilation equipment, and life rafts on board. The chain connects the equipment to the hull structure, preventing equipment displacement due to turbulence during navigation.

- **Marine Aquaculture Facilities:** Used in nearshore aquaculture for securing the edges and corners of cages and floating platforms, or for frame connections. It withstands long-term seawater immersion, preventing corrosion and breakage that could damage the facilities.

### 2. Extended Applications: Land-based Outdoor and Industrial Scenarios
Thanks to its hot-dip galvanized corrosion resistance and DIN766 standard strength, it is also suitable for humid and dusty outdoor or industrial environments.

- **Outdoor Security and Protection:** Used as connecting chains for outdoor fences and isolation nets, or as padlock chains for warehouse and factory gates. Particularly suitable for rainy, coastal outdoor areas, it has a lifespan 3-5 times longer than ordinary black chains.

- **Lifting and Traction Assistance:** In light lifting scenarios (such as short-distance movement of objects under 500kg within a workshop), it serves as an auxiliary traction or securing chain, used in conjunction with hooks; it can also be used for simple traction of agricultural machinery (such as tractors), connecting implements, or temporarily securing goods.

- **Architectural and Decorative Applications**: In landscape engineering, it can be used as decorative chains for railings, hanging chains for chandeliers, or for door and window decorations in retro-style buildings. Its hot-dip galvanized silver-white appearance combines practicality and aesthetics.

### 3. Specific Scenarios: Warehousing and Logistics

In light-load scenarios in warehousing and logistics, it can replace some dedicated chains, reducing costs.

- **Shelf Load Fixing**: Used to limit the movement of stacked goods on warehouse shelves, preventing goods from slipping. It is especially suitable for storing heavier but not overweight items such as metal parts and hardware tools.

- **Conveying Equipment Auxiliary**: At the ends of small belt conveyors and roller conveyors, it acts as a stop chain to prevent goods from falling when transported to the end, adapting to low-speed, light-load conveying requirements.

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Support and Services:

Warranty Service: Some suppliers offer a 22-month warranty. During this period, if the chain has quality defects due to material or manufacturing process issues, such as plating peeling or broken links, the supplier will repair or replace it free of charge.

Technical Support: Suppliers typically provide technical consultation services to answer customer questions regarding chain selection, installation, use, and maintenance.

This high - strength alloy steel painted stud - link anchor chain, with its excellent quality and attentive service, builds a solid guarantee for your maritime career. Choosing us means choosing safety, efficiency, and worry - free operation. Embark on a new journey of navigation, starting from choosing our anchor chain!
 
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