European Type D Anchor Shackles Carbon Steel 304/316 Stainless Steel Polished Chains for Lifting Shackle

European Type D Anchor Shackles Carbon Steel 304/316 Stainless Steel Polished Chains for Lifting Shackle

Product Description:

Material Advantages:

### I. Core Advantages of Carbon Steel

- **Strength Suitable for Heavy Loads:** Carbon steel inherently possesses high mechanical strength. After forging and heat treatment, its tensile strength and yield strength are excellent, matching the heavy load requirements of lifting operations. It is suitable for conventional industrial scenarios where load-bearing capacity is prioritized over corrosion resistance.

- **Strong Structural Stability:** Carbon steel has moderate toughness and good impact resistance. In scenarios involving frequent lifting and instantaneous stress, it is less prone to brittle fracture or permanent deformation, ensuring operational safety.

- **High Cost-Effectiveness:** Compared to stainless steel, carbon steel has lower raw material and processing costs, making it suitable for bulk purchases in lifting scenarios with less stringent requirements for corrosive environments, reducing overall rigging costs.

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### II. Core Advantages of 304/316 Stainless Steel

#### 1. 304 Stainless Steel: Basic Corrosion Resistance + Universal Adaptability

- **Corrosion Resistance in Conventional Environments:** Resistant to corrosion from air, moisture, and mild acidic or alkaline media, it is not prone to rust and is suitable for scenarios such as humid workshops and short-term outdoor operations, requiring minimal maintenance.

- Balancing Strength and Toughness: While maintaining the corrosion resistance of stainless steel, its mechanical strength meets the needs of medium and light-duty lifting. It can be paired with polished chains for general industrial lifting, equipment securing, etc.

- Good Polishing Compatibility: The material has moderate ductility, and after polishing, the surface is smooth and burr-free, improving the appearance and reducing wear on the matching chains and slings.

#### 2. 316 Stainless Steel: Enhanced Corrosion Resistance + Harsh Environment Adaptability

- Extreme Environment Resistance: Due to the addition of molybdenum, its corrosion resistance far exceeds that of 304 stainless steel. It can withstand harsh environments such as marine salt spray, chemical acid and alkali solutions, and high humidity and high salinity, making it suitable for ships, offshore platforms, chemical workshops, and other scenarios.

- Long Service Life: It is not prone to material aging and strength loss in corrosive environments, reducing replacement frequency and lowering long-term operating costs. It is especially suitable for lifting operations in long-term outdoor or harsh conditions.

- High Safety and Stability: Even in corrosive environments, it maintains stable mechanical properties, avoiding the risk of fracture due to corrosion and ensuring the safety of lifting operations.

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### III. Auxiliary Advantages of Polishing Process for Materials

- Enhanced Corrosion Resistance: Polishing removes oxide scale and impurities from the material surface, creating a smooth surface, reducing contaminant adhesion, lowering the probability of corrosive media intrusion, and thus enhancing the material's corrosion resistance.

- Reduced Wear and Tear: The smooth polished surface reduces friction when used with chains, slings, and other accessories, reducing mutual wear and extending the overall service life of shackles and matching rigging.

- Facilitates Visual Inspection: The unobstructed polished surface allows for direct observation of cracks, scratches, and other damage, facilitating routine safety checks and timely detection of potential hazards.

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Manufacturing Process:

1. **Raw Material Preparation and Cutting**

1. **Material Selection**: For carbon steel, select high-quality carbon steel round bars that meet heavy-duty standards. For stainless steel, use qualified 304 or 316 stainless steel bars. All raw materials must be accompanied by quality certificates to ensure that the chemical composition and mechanical properties meet standards.

2. **Cutting**: According to the product specifications, cut the raw materials using a saw or professional cutting machine, controlling the cutting tolerance to approximately ±1mm. After cutting, remove the sharp edges to ensure a smooth surface, while leaving a 2-5mm allowance for subsequent processing.

2. **Forging and Shaping**

1. **Heating**: Place the billet in a furnace or similar equipment for heating. For carbon steel, temperature control is necessary to prevent oxidation. For 304 and 316 stainless steel, the heating temperature is typically 1050-1200℃, and heating must be uniform. For high-strength products, stepped heating is required to avoid thermal cracking.

2. **Body Forging**: First, the billet is upset twice at both ends using a custom mold and a robotic arm, ultimately forming a ball head. Then, the ball heads are flattened and punched using a special mold, with machining allowances allowed for the punched holes. Next, the middle section of the billet is bent into a D-shape and shaped using a mandrel, ensuring the angles and dimensions meet the drawing requirements. The final forging temperature is no less than 830℃.

3. **Spiral Pin Forging**: A separate round steel bar of the corresponding material is heated, upset and drawn using an air hammer, and then placed into a special mold for forming, ensuring the spiral pin's precision to fit the body's holes and thread assembly.

3. **Finishing and Machining**

1. **Edge Trimming and Grinding**: After the formed billet cools, the forging flash is removed using an edge trimmer, and the surface is then ground with a grinding wheel to remove oxide scale, burrs, and forging marks, obtaining a smooth surface. For stainless steel models, this step also requires basic treatment for subsequent polishing.

2. **Precision Machining**: Key components such as holes in the shackle body and threads on the auger pin are cut and tapped to ensure smooth screw insertion and a tight fit after connection. Dimensions are also calibrated to ensure compliance with structural standards corresponding to the rated load.

4. **Surface Treatment**

1. **Carbon Steel Version**: Commonly used methods include hot-dip galvanizing, electroplating, or painting to enhance corrosion resistance and prevent rapid rusting in humid environments.

2. **Stainless Steel Version**: First, acid pickling removes surface impurities, followed by polishing to achieve a smooth, burr-free surface, reducing wear on the rigging and improving corrosion resistance. Some high-end products undergo further passivation treatment to enhance rust prevention.

5. **Assembly and Performance Testing**

1. **Assembly**: The machined shackle body and auger pin are assembled. Some products require cotter pins, anti-loosening nuts, and other accessories to ensure the auger pin is secure after assembly, opening and closing smoothly and locking reliably.

2. **Quality Inspection**: First, use a flaw detector to perform magnetic particle or ultrasonic flaw detection to check for surface and internal defects such as cracks and delamination; then, perform a breaking test on the finished product, typically requiring a load of at least 2.5 times the working load; finally, check dimensional accuracy, thread compatibility, and other appearance and functional indicators. Products that fail to meet the standards must be reworked.

6. **Finished Product Packaging**: After passing inspection, package the finished product according to the previously mentioned individual or batch packaging specifications, labeling it with information such as material, specifications, and rated load. Simultaneously, ensure moisture-proof and impact-proof protection before shipment.

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Features:

This European-style D-type anchor shackle combines material characteristics, structural design, and technological advantages, excelling in strength, adaptability, and safety. Different material versions also feature enhanced performance for specific scenarios. Specific product features are as follows:

1. **Strong Material Adaptability, Tolerant of Various Environments**

- **Carbon Steel Version**: Primarily uses high-quality materials such as 45# carbon steel. Some products are equipped with 40Cr alloy steel spiral pins, meeting the heavy-duty requirements of heavy industry. After subsequent galvanizing and powder coating surface treatments, it can resist rust in normal environments, suitable for dry indoor environments and general outdoor environments without strong corrosion.

- **304/316 Stainless Steel Version**: 304 stainless steel can withstand humid outdoor environments and mild acidic/alkaline environments; 316 stainless steel has stronger corrosion resistance, resisting seawater salt spray and chemical media. Both stainless steel versions have highly polished surfaces, eliminating sharp edges and reducing wear on the matching chains and ropes, making them suitable for harsh environments such as marine and chemical plants.

2. **Scientific Structural Design, Convenient and Efficient Use**

- **D-Shaped Structure Adapts to Straight-Line Loads**: The D-shaped design provides ample connection space, easily connecting chains, wire ropes, and other rigging. This shape also concentrates force along a straight line, making it particularly suitable for straight-line load scenarios, ensuring stable force transmission under heavy loads and preventing safety hazards caused by force deviation.

- **Flexible Helical Pin Operation**: Mainstream models feature threaded helical pins, allowing for manual tightening or loosening without special tools. Whether for temporary hoisting or long-term fixing, assembly and disassembly can be completed quickly. Some special models also feature countersunk pins, which require a flathead screwdriver to open, providing anti-theft and tamper-proof protection, suitable for ship anchoring, public area equipment fixing, and other scenarios.

3. **Forging Process Enhances Strength and Durability**

Both the body and pins are manufactured using a forging process. Compared to casting and other processes, this results in a denser internal structure, reducing defects such as porosity and cracks, and significantly improving overall strength. For example, some carbon steel models boast a breaking strength of up to 48,000 pounds, and the entire product line generally undergoes a 2.5 times rated load fracture test. Some batches also pass 20,000-cycle fatigue tests, making them suitable for the high-frequency operation requirements of heavy lifting in mines, ports, and other similar environments, resulting in a longer service life.

4. **Comprehensive Safety and Wide Applicability**

- After tightening the threaded helical pin, the shoulder of the pin can fit tightly with the shackle lug, preventing easy loosening under heavy loads; some products also come with isolation washers to further enhance post-assembly stability.

- A full range of product specifications are available, from 4mm to 38mm in various sizes, and customization is also supported. This caters to both light-load needs for small equipment maintenance and heavy-load scenarios such as 33t heavy industrial lifting and offshore platform operations, demonstrating excellent compatibility.

5. **Strict Quality Standards and Stable, Reliable Quality**

Production largely adheres to relevant standards, and each batch undergoes sampling damage testing. Some high-end models also undergo comprehensive flaw detection to identify hidden internal defects. In addition, surface treatment processes such as electrolytic coating for stainless steel models and galvanizing for carbon steel models not only improve corrosion resistance but also make the products look neat. They also reduce stress concentration problems caused by surface defects during use, further ensuring safety.

Technical Parameters:

Applications:

This European-style D-type anchor shackle (made of carbon steel/304/316 stainless steel) is primarily designed for "lifting connection and fixed positioning" scenarios. Its material variations cover a variety of needs, including general industrial applications, corrosive environments, and heavy-duty operations. Specific applicable scenarios are as follows:

### I. General Industrial Lifting Scenarios

- Factory Workshops: Heavy equipment installation, production line component hoisting, mold transfer, etc. The carbon steel version is suitable for dry indoor environments, while the 304 stainless steel version is suitable for humid workshops.

- Warehousing and Logistics: Heavy cargo transfer in warehouses, pallet stacking and hoisting, bulk cargo loading and unloading at ports/docks. It can be used with chains or wire ropes for quick connections.

- Equipment Maintenance: Disassembly and hoisting of various machinery (such as machine tools and motors), temporary fixing of maintenance parts, balancing convenience and load-bearing safety.

### II. Outdoor and Infrastructure Scenarios

- Building Construction: Hoisting of steel structure components, precast concrete parts, and rebar binding; bridge segment splicing and temporary support fixing during bridge construction.

- Power Infrastructure: Installation of power towers, hoisting of heavy power equipment such as transformers, and rigging connections during transmission line construction.

- Road Engineering: Transfer and securing of large construction machinery (such as excavators and road rollers), and hoisting of heavy objects during road and bridge maintenance.

### III. Corrosive Environment-Specific Scenarios (304/316 Stainless Steel Versions)

- Marine Sector: Ship anchor chain connections, deck equipment securing, offshore platform hoisting operations, securing fishing trawl equipment, and resisting seawater salt spray corrosion.

- Chemical Industry: Equipment hoisting and pipeline securing in acidic and alkaline environments in chemical workshops, and installation and maintenance of large filtration equipment in wastewater treatment plants.

- Long-Term Outdoor Scenarios: Secure heavy objects in open-air storage, and install outdoor recreational facilities (such as large slides and steel structure landscapes). The 304 stainless steel version is suitable for general outdoor use, while the 316 version is suitable for high humidity and high salinity areas.

### IV. Heavy Load and Special Operation Scenarios

- Heavy Industry Heavy Load: Ore transfer in mines, steel ladle hoisting in the metallurgical industry, container loading and unloading in ports; carbon steel models are well-suited for heavy load requirements due to their high strength.

- Special Industries: Food processing workshops (304/316 stainless steel models, corrosion-resistant and pollution-free), equipment hoisting in the pharmaceutical industry, ground equipment transfer in the aerospace and military fields (customized models must meet high precision and high safety standards).

- Temporary Emergency: Rapid connection of lifting equipment and hoisted objects in engineering rescue and relief operations, such as bridge collapse rescue and heavy vehicle towing and securing.

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!

Any question please let us know ,our JinCheng maritime will provide you the best service with 7*24 hours ~