Welding Stud Link Anchor Chain U1 U2 U3 Zinc Finish Marine Grade

Product Description:

Material Advantages:

Welding Stud Link Anchor Chain U1 U2 U3 Zinc Finish Marine Grade refers to welded stud anchor chains of grades U1, U2, and U3, galvanized marine anchor chains. The following is a product description:

- **Material:** U1 grade anchor chains are typically made of CM370 steel, U2 grade uses CM490 steel, and U3 grade uses CM690 steel, all high-quality low-alloy steel with good strength and toughness.

- **Grade Classification:** Based on strength, they are divided into three grades: U1, U2, and U3. U1 grade has relatively low strength, U2 grade has moderate strength, and U3 grade has the highest strength, meeting the needs of different ships and marine engineering projects.

- **Specifications and Dimensions:** The chain link diameter generally ranges from 12.5mm to 162mm, with common sizes being 12.5mm, 14mm, and 16mm. Each link length is typically 25.0 to 27.5 meters.

- **Manufacturing Process:** Round steel is welded into chain links using a flash butt welding process, followed by heat treatment to improve the strength and toughness of the chain links. After welding, the anchor chain undergoes material performance testing, proof load testing, and break load testing to ensure product quality.

- **Surface Treatment:** Galvanized, typically hot-dip galvanized, but other surface treatments such as painting and blackening are available upon request. Galvanizing effectively improves the anchor chain's corrosion resistance, allowing for long-term use in marine environments.

- **Certification Standards:** Compliant with relevant standards of the International Association of Classification Societies (IACS), and can provide certifications from classification societies such as CCS, ABS, LR, DNV-GL, NK, and KR, ensuring the product meets safety and quality requirements for marine anchor chains.

- **Application Scenarios:** Widely used in mooring systems for various types of vessels, as well as for positioning and securing marine engineering facilities such as offshore drilling platforms and offshore wind power platforms. It can also be used in dock mooring systems.

Manufacturing Process:

The production process of welded U1/U2/U3 grade galvanized marine anchor chains revolves around "material control - forming and welding - reinforcement treatment - corrosion protection - quality inspection before shipment," and complies with marine industry standards throughout. The detailed steps are as follows:

### 1. Raw Material Procurement and Pre-treatment

- Select the appropriate round steel material according to the anchor chain grade (U1/U2/U3) (CM370 for U1, CM490 for U2, and CM690 for U3). Raw materials must undergo material composition testing to ensure compliance with IACS and classification society standards.

- Straighten and remove rust from the round steel to remove surface oxide scale and impurities, avoiding any impact on subsequent welding quality.

### 2. Chain Link Forming and Welding

- Cut the round steel into pre-set lengths using a shearing machine, and then bend them into chain link shapes using a cold bending machine, ensuring precise chain link dimensions (diameter and pitch meet specifications).

- The chain link interfaces are joined using flash butt welding. During welding, current, pressure, and cooling rate are controlled to ensure a strong, defect-free weld.

- After welding, excess weld material is removed, and the chain link surface is ground to make the connection smooth and flat, preventing stress concentration during use.

### 3. Heat Treatment Strengthening

- The welded chain links are sent to a heat treatment furnace for "quenching + tempering." Different grades of anchor chains require different heat treatment parameters (e.g., U3 grade requires higher quenching temperatures and holding times).

- Heat treatment improves the strength, toughness, and impact resistance of the chain links, ensuring that U1/U2/U3 grades meet their respective strength standards.

### 4. Surface Anti-corrosion Treatment (Zinc Plating)

- After heat treatment, the anchor chains are first pickled to remove the surface oxide layer and oil, preparing for galvanizing.

- Hot-dip galvanizing is used, immersing the anchor chain in molten zinc to form a uniform and dense zinc layer on the chain links. The zinc layer thickness must meet marine corrosion protection requirements, effectively resisting seawater corrosion.

- After galvanizing, cooling and passivation treatments are performed to enhance zinc layer adhesion and prevent peeling.

### 5. Assembly and Connection

- Connect individual chain links into complete anchor chain links according to standard link lengths (usually 25-27.5 meters), equipped with corresponding connecting shackles or swivels.

- A second inspection of the connection points is conducted to ensure a secure connection, free from loosening or assembly defects.

### 6. Quality Inspection and Certification

- Multiple tests are conducted, including material composition analysis, non-destructive testing of welds (such as ultrasonic testing), proof load test, and break load test.

- After passing the tests, certification from classification societies such as CCS, ABS, and LR is applied for, and corresponding test reports and certification certificates are issued.

- A final comprehensive re-inspection of the anchor chain's appearance, dimensions, and galvanized layer quality is conducted, and any substandard products are rejected.

### 7. Packaging and Shipment

- Qualified anchor chains are packaged using spiral wrapping or pallet packaging, ensuring moisture and impact protection.

- Product certificate, test report, classification society certification, and other necessary documents are included, and shipment is made according to order requirements.

Features:

Welding Stud Link Anchor Chain U1, U2, and U3 Zinc Finish Marine Grade features high strength, excellent corrosion resistance, and structural stability. Here's a detailed description:

- **High Strength and High Toughness**: U1, U2, and U3 grade anchor chains are made of high-quality low-alloy steels such as CM370, CM490, and CM690 respectively. After appropriate heat treatment, such as quenching and tempering, they possess different levels of high strength and good toughness, capable of withstanding the enormous tensile forces during ship anchoring. The U3 grade has the highest strength, meeting the requirements for use in harsher sea conditions.

- **Excellent Corrosion Resistance**: The products are galvanized, typically hot-dip galvanized. The zinc layer forms a protective film in harsh environments such as seawater, effectively resisting corrosion and extending the service life of the anchor chain. Suitable for ships and marine engineering facilities operating in marine environments for extended periods.

- **Stable and Reliable Structure**: The chain links feature a stud design. The central stud enhances the rigidity of the chain links, preventing severe deformation under heavy loads and avoiding tangling when twisted. This facilitates smooth deployment and retrieval of the anchor chain via the anchor winch. - **Stable Connections:** The equipped shackles and other connectors are of reliable quality, ensuring a secure connection between the anchor chain and the anchor, preventing accidental detachment during use.

- **Various Sizes and Specifications:** Chain link diameters generally range from 12.5mm to 162mm, with common sizes including 12.5mm, 14mm, and 16mm. Custom lengths and specifications are also available to meet diverse needs in various vessels and marine engineering projects.

- **Compliance with Stringent Standards:** The products comply with the relevant standards of the International Association of Classification Societies (IACS) and are certified by classification societies such as CCS, ABS, LR, and DNV-GL, ensuring authoritative recognition of their safety performance and quality.

- **Traceability:** Each anchor chain link is typically marked with a unique identification number, facilitating traceability of production batches, quality inspection information, and other data, which is beneficial for quality control and management.

Technical Parameters:

Applications:

Welding Stud Link Anchor Chain U1 U2 U3 Zinc Finish Marine Grade is primarily used in shipbuilding and marine engineering. Specific application scenarios are as follows:

- **Ship Anchoring**: This is the main application scenario for this product, suitable for vessels of all sizes, including small yachts, sailboats, large merchant ships, oil tankers, and warships. The anchor chain connects the vessel to the anchor, providing reliable anchoring force in harsh sea conditions such as strong currents and large waves, ensuring safe mooring.

- **Marine Engineering Platforms**: Used for positioning and securing platforms in offshore oil drilling platforms, offshore wind power platforms, and other marine engineering facilities. High-grade anchor chains such as U3, with their excellent corrosion resistance and high strength, can work stably for extended periods in deep-sea environments, resisting seawater corrosion and the impact of wind and waves.

- **Marine Towing and Salvage Operations**: In marine towing and salvage operations, this product can be used to tow large vessels or salvage sunken objects. Its robust structure allows it to withstand heavy loads for extended periods, ensuring smooth operation.

- **Marine Mooring Systems**: These systems can be used at docks and ports to connect vessels to the pier, ensuring stability while berthing. They can also be used to secure buoys, marine aquaculture cages, and other facilities, providing stable support against currents and waves.

Support and Services:

After-sales consultation: We provide 24/7 customer service to answer customer questions regarding anchor chain usage, such as anchor chain specification selection, usage methods, and maintenance points.

Regular follow-up visits: The manufacturer may conduct regular follow-up visits to customers to understand the anchor chain usage and collect customer feedback in order to continuously improve product quality and service levels.

Maintenance guidance: The manufacturer or professional organizations will provide customers with anchor chain maintenance guidance, including regularly checking for deformation, rust, and wear of the chain links; cleaning the anchor chain with special cleaning agents and brushes; applying rust-preventive oil or corrosion inhibitors after cleaning; and lubricating the chain link connections.

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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