Grade R3-R3S Stud Link Offshore Mooring Chain

The Grade R3-R3S Stud Link Offshore Mooring Chain is a heavy-duty mooring product CSAC Chain has developed specifically for the harsh environments of offshore operations. Featuring a "stud link" structural design—characterized by the presence of internal studs within the chain links—it offers superior structural stability compared to studless chains. This design effectively minimizes deformation and stress concentration while reducing the risk of kinking, making it ideally suited for offshore mooring scenarios involving prolonged exposure to cyclic loading. Both the Grade R3 and Grade R3S variants are manufactured using high-strength steel; notably, the Grade R3S variant offers enhanced fatigue resistance and toughness, enabling it to meet the most rigorous demands of long-term offshore service. Thanks to its exceptional overall performance, the Grade R3-R3S Stud Link Offshore Mooring Chain has established itself as a critical mooring component within the offshore engineering sector.

Product Features

1. Stable Structure, Strong Resistance to Twisting and Kinking

The Grade R3-R3S Stud Link Offshore Mooring Chain features a stud-link structural design, wherein each chain link is fitted with a central stud. Compared to studless chains, this design offers superior strength and minimal deformation. It is less prone to twisting or tangling during stacking and deployment, effectively reducing stress concentration during mooring operations and preventing link deformation or damage. This enhances the overall stability and safety of the mooring system, making it ideally suited for the long-term mooring requirements of large and medium-sized offshore platforms.

2. Premium Materials, Outstanding Comprehensive Performance

We utilize high-grade, high-strength steel to manufacture our Grade R3-R3S Stud Link Offshore Mooring Chains. Specifically, the Grade R3 chain is produced using 30Mn2 steel, boasting a tensile strength of no less than 690 MPa; the Grade R3S chain employs 25MnCrMo steel, featuring a tensile strength of no less than 770 MPa, along with superior fatigue resistance and toughness. Through rigorous heat treatment processes, we further enhance the steel's hardness and toughness, enabling the product to withstand the cyclic loads imposed by offshore winds, waves, and currents, thereby extending its service life.

3. Corrosion-Resistant and Durable, Adapted for Harsh Environments

Designed to withstand the harsh offshore environment—characterized by high salinity and humidity—the Grade R3-R3S Stud Link Offshore Mooring Chain undergoes specialized surface treatments. These treatments effectively boost the product's corrosion resistance, enabling it to withstand degradation caused by seawater erosion and marine biofouling. This ensures the chain maintains stable performance throughout long-term offshore operations while simultaneously reducing maintenance costs.

4. Comprehensive Specifications, Customization Available

The Grade R3-R3S Stud Link Offshore Mooring Chain is available in a full range of specifications, covering diameters from 34mm to 142mm. We offer customization options for specific diameters and lengths to meet the unique requirements of each client's project. Furthermore, the chains can be paired with various end fittings, connectors, anchors, shackles, swivels, and other accessories, allowing us to provide comprehensive, one-stop mooring solutions tailored to the distinct needs of diverse offshore engineering projects. 

Product Parameters

Technical Advantages

1. R&D Technical Advantages

The company maintains a deep collaborative partnership with the Jiangsu University of Science and Technology, having jointly established the "Research Institute for Intelligent Control and Optimized Design of High-Strength Marine Cables." This institute focuses on the technical R&D and upgrading of Grade R3-R3S Stud Link Offshore Mooring Chains and related products. By leveraging the research resources of the university alongside the company's practical manufacturing experience, we continuously optimize product structures and manufacturing processes to enhance product performance. Furthermore, the company holds 17 domestic and international patents—including a Luxembourgish patent for an "Automated Production Device for Chain Studs." This innovation has enabled the automation and standardization of chain stud production, effectively boosting production efficiency and product consistency while minimizing human error.

2. Manufacturing Process Advantages

The Grade R3-R3S Stud Link Offshore Mooring Chain utilizes pulse flash butt welding technology—an efficient and highly applicable solid-state welding method. This technique effectively enhances the strength and toughness of welded joints, prevents welding defects, and ensures the reliability of the chain link connections. Additionally, we have optimized our heat treatment processes; by precisely controlling heating and cooling temperatures and durations, we ensure the full realization of the steel's potential properties, thereby guaranteeing that every section of the Grade R3-R3S Stud Link Offshore Mooring Chain possesses stable mechanical properties.

3. Quality Inspection Advantages

We have established a comprehensive quality inspection system that subjects every stage—from raw material procurement to final product shipment—to rigorous scrutiny. Upon the arrival of raw materials, we conduct thorough inspections of the steel's composition and mechanical properties. During the production process, we perform real-time monitoring of the quality of chain link forming, welding, and heat treatment. Prior to shipment, finished products undergo a series of tests—including tensile tests, impact tests, and corrosion resistance tests—to ensure that the Grade R3-R3S Stud Link Offshore Mooring Chain complies with both international standards and client specifications; products are delivered to clients only after successfully passing all inspections. 

Application Cases

Our Grade R3-R3S Stud Link Offshore Mooring Chains have been widely deployed in numerous offshore engineering projects worldwide. Renowned for their stable performance and reliable quality, they have garnered high acclaim from our clients. The following are a few typical examples:

Case 1: Southeast Asia Offshore Wind Power Project

Project Location: An offshore wind farm off the coast of a Southeast Asian nation.

Project Requirements: A mooring system compatible with semi-submersible offshore wind turbines was required. The mooring chains needed to demonstrate exceptional fatigue resistance, corrosion resistance, and high load-bearing capacity. Specifications ranged from 80mm to 100mm, and dual certification from DNV and ABS was mandatory.

Solution: We supplied this project with Grade R3S Stud Link Offshore Mooring Chains, along with accompanying accessories such as shackles and swivels. Manufactured using high-strength 25MnCrMo steel and produced via the pulse flash butt welding process, the products underwent rigorous manufacturing and inspection procedures strictly in accordance with DNV and ABS standards. Additionally, the surface anti-corrosion treatment was optimized to suit the specific marine environmental characteristics of the project site.

Project Feedback: Since being put into service, the products have operated with great stability, effectively withstanding offshore winds, waves, and seawater corrosion. No quality issues have arisen, and the chains have successfully met the long-term mooring requirements of the wind turbines, earning high praise from the project stakeholders.

Case 2: Domestic FPSO Mooring Upgrade Project

Project Location: An FPSO platform in the South China Sea.

Project Requirements: An upgrade to the existing mooring system was required, involving the replacement of certain aging mooring chains. The new chains needed to be fully compatible with the existing system while possessing high tensile strength and excellent fatigue resistance. Specifications ranged from 120mm to 142mm, and CCS certification was required.

Solution: We supplied this project with a combination of Grade R3 and R3S Stud Link Offshore Mooring Chains—deploying Grade R3S products for critical sections and Grade R3 products for non-critical sections. This approach successfully met the project's performance requirements while simultaneously optimizing project costs. Furthermore, we provided professional technical guidance regarding the installation process.

Project Feedback: Following installation, the products demonstrated perfect compatibility with the existing system and operated with stability. Both load-bearing capacity and fatigue resistance met the project's specifications, effectively enhancing the mooring safety of the FPSO platform and extending the overall service life of the mooring system.