Alloy Steel Studless Black Galvanization G80 Chain Blacken Finished, Galvanized Standard EN 818-2

Product Description:

Material Advantages:

Studless Anchor Chains

Lightweight, flexible, and cost-effective, with smooth link surfaces for easy handling and storage. Perfect for small-to-medium vessels, fishing boats, and coastal operations requiring efficient anchoring.

Grade 1: Tensile strength ranges from 27.5 kN to 72.5 kN.

Grade 2: Tensile strength ranges from 39 kN to 102 kN.

Grade 3: Tensile strength ranges from 52 kN to 132 kN.

Manufacturing Process:

Selection and Pre-treatment of Raw Materials
Select high-quality alloy steel (such as 20CrMnTi, 40Cr, etc.) as the base material for the chain plates, and use chromium-molybdenum alloy steel for the pins and sleeves. After the raw materials arrive at the factory, they need to be verified for material composition through spectroscopy analysis and hardness testing; then, they undergo straightening and rust removal to remove surface oxide scales and impurities, avoiding subsequent processing defects.
Precision Pressing of Chain Plates
Use CNC stamping equipment to process the alloy steel plates according to the designed dimensions for integrated processing of blanking + punching, directly forming the 8-shaped chain plate section. During the stamping process, the mold gap is strictly controlled to ensure that the hole diameter tolerance of the chain plate is ≤ ±0.05mm, and the edges have no burrs or flash; after stamping, the chain plate is flattened to ensure that the flatness error is ≤ 0.1mm/m, avoiding uneven force during assembly.
Cold Bending Processing of Pins and Sleeves
Pins and sleeves are formed by cold bending process, replacing traditional cutting processing, which can significantly improve material utilization and component strength. The pins after cold bending need to be finely ground by an uncentered grinding machine to ensure that the surface roughness Ra ≤ 0.4μm, and the diameter tolerance is controlled within h8 grade; the inner wall of the sleeves is treated by honing to ensure precise matching of the fit with the pins and meet the requirements for rotational flexibility.
Heat Treatment for Key Components
This is the core process that determines the strength and wear resistance of the chain, and it is carried out in three steps:
Carburizing treatment: Place the chain plates, pins, and sleeves in a carburizing furnace and introduce carburizing medium at 900-930℃ to increase the carbon content on the surface to 0.8%-1.2% and the depth to 0.8-1.2mm;
Quenching + Low-Temperature Tempering: After carburizing, quickly quench and cool to form a high-hardness martensite structure on the surface, then temper at 180-220℃ to eliminate internal stress, and finally the surface hardness of the components reaches HRC 58-62, while the core maintains HRC 30-35 for toughness, balancing wear resistance and impact resistance;
Cleaning and Drying: After heat treatment, remove the oxide scales and oil stains on the surface of the components to avoid residual impurities affecting subsequent assembly.
Chain Assembly and Pre-Tensioning
Assembly process: Use automated assembly equipment to press the sleeves into the inner chain plate holes, then insert the pins through the sleeves and the outer chain plates to form a chain section unit; for non-gapped chains, the structure has no intermediate crossbar, and the entire chain is assembled directly through the interlaced combination of the outer and inner chain plates.
Pre-Tensioning Treatment: Fix the assembled chain on a dedicated tensile machine, apply 1.5 times the rated working load of tension and hold for 10-15 minutes to eliminate the assembly gap and residual stress, preventing elongation and deformation during use, and the length tolerance of the chain after pre-tensioning is controlled within ±0.1%.
Surface Anti-corrosion Treatment
According to customer requirements and application scenarios, select the corresponding surface treatment process:
Galvanizing: Use hot-dip galvanizing or electro-galvanizing, with a coating thickness of ≥ 85μm, suitable for humid and mild corrosion environments;
Blackening: Form a black protective film through chemical oxidation, suitable for dry conditions, with both rust prevention and aesthetic properties;
Galvanizing: Suitable for marine and highly corrosive environments, with strong adhesion and salt spray resistance of over 1000 hours.

Features:

The main body is made of high-quality alloy steel. The key components such as chain plates and pin shafts have undergone professional heat treatment including carburizing and quenching, achieving a hardness of HRC40-50, significantly enhancing strength and fatigue resistance.
The pin shafts and sleeves are made of chromium-molybdenum steel and undergo polishing treatment. The surface roughness is controlled below Ra0.4μm, reducing friction loss during movement.
The chain plates are stamped, the components are cold-hammered, and pre-tensioned assembly processes are adopted to ensure a compact structure and secure connection, suitable for long-term high-frequency operation requirements.

The no-plate design simplifies the structure while achieving lightweight and rigidity. The chain plate adopts an 8-shaped cross-section, which reduces weight while balancing the forces in all directions.
The sleeve and pin shaft are designed for dynamic fit, allowing the rollers to rotate freely. When meshing with the chain wheel teeth, it forms rolling friction, significantly reducing the wear rate.
It supports single-row, double-row or multi-row combinations. The multi-row structure is connected in parallel through spacer rings, and the capacity can be flexibly adapted to different load requirements.
It can be paired with surface treatment processes such as blackening and galvanizing to enhance rust prevention and corrosion resistance, and is suitable for complex working environments.

Technical Parameters:

Applications:

- **Application Scenarios**: Widely used in anchoring systems for various vessels, including fishing boats, yachts, merchant ships, and warships, ensuring stability while moored. It is also suitable for securing and stabilizing offshore drilling platforms, floating docks, and other marine engineering equipment, as well as other areas requiring high strength and corrosion resistance, such as docks and port facilities.

316 stainless steel anchor chains are widely used in various fields due to their excellent corrosion resistance and high strength. The following are their main application scenarios:

- **Ship Anchoring**: This is the most common application scenario for 316 stainless steel anchor chains, suitable for various types of vessels, including yachts, sailboats, merchant ships, and fishing vessels. In yachts and sailboats, their aesthetic appeal and low maintenance meet the owner's requirements for both appearance and performance. In merchant ships and fishing vessels, their high strength and corrosion resistance ensure safe anchoring in various sea conditions.

- **Marine Engineering**: In marine engineering facilities such as offshore drilling platforms and offshore wind power platforms, 316 stainless steel anchor chains can be used for platform positioning and fixation. They can operate stably for extended periods in harsh marine environments, resisting seawater corrosion and the impact of waves.

- **Ports and Docks**: They can be used in dock mooring systems, such as mooring chains connecting ships to the dock, and in lifting and hoisting operations in port facilities, such as lifting containers and heavy equipment. Their high strength and corrosion resistance ensure safe and reliable operations.

- **Marine Aquaculture:** In marine aquaculture, 316 stainless steel anchor chains can be used to secure aquaculture cages, ensuring their stability in currents and waves, while also resisting seawater corrosion and extending the cages' lifespan.

- **Water Recreation Facilities:** For floating structures in water parks and pontoon bridges at docks, 316 stainless steel anchor chains can be used to secure and connect these facilities, ensuring their stability and safety in the water. Their aesthetic appeal also complements the overall style of the water recreation facilities.

Packing

1. Without Package
2. Steel Drum
3. Wooden Crate
4. Steel Crate
Pallet material Steel or Wood (Ply)

All Package will be shipped default unless requested by costumers for special packaging.

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 ~