Pre-Embedded Sleeve

APPLICATION SCENARIOS

1. Embedded parts of tunnel segments, used for fixed connections between equipment such as external hanging channels, evacuation platforms, and cable brackets and the segments.
   
   

Product Description

High-end pre-embedded sleeves are made of 316 austenitic stainless steel via precision casting. Through the design of a double-layer insulation structure, they achieve electrical isolation performance with an insulation resistance ≥10⁸Ω. Combining a pull-out strength ≥15kN and a torsional fatigue life ≥5000 cycles, they provide lifetime maintenance-free solutions for scenarios such as rail transit and medical equipment that have stringent requirements on the insulation and mechanical reliability of metal components.

PRODUCT FUNCTION

Extreme mechanical guarantee:  

The 316 stainless steel matrix has a yield strength ≥205MPa, with pull-out bearing capacity increased by 200% (compared to 304 stainless steel).  

The special tooth groove structure enables torsional fatigue life to exceed 5,000 cycles (per EN 14399 test standard).  

Dual electrical isolation:  

Alumina ceramic insulation layer + polymer sealing ring block leakage current paths at the 10⁸Ω level.  

Dielectric strength ≥3kV/mm (per IEC 60112 wet test).  

All-environment corrosion resistance:  

316L ultra-low carbon composition resists chloride ion corrosion (passes 480-hour salt spray test ISO 9227).  

Zero structural embrittlement within the -60℃~300℃ temperature range, eliminating the risk of cold shrinkage and detachment.  

Intelligent installation compatibility:  

Internal thread precision reaches GB/T 196 Class 6H, compatible with automatic torque fastening systems.

PERFORMANCE INDEX

Core material: 316 austenitic stainless steel (Cr17/Ni12/Mo2)  

Mechanical properties:  

Pull-out force ≥15kN (per ISO 898-1)  

Torque resistance ≥35N·m  

Fatigue cycles resistance ≥5,000 cycles (load ±15°)  

Electrical properties:  

Insulation resistance ≥1×10⁸Ω (DC 500V, 23℃/50%RH)  

Dielectric strength ≥3kV/mm (AC 1min)  

Corrosion resistance grade: Grade 10 (ISO 9227 1000h salt spray test)  

Precision control: Internal thread tolerance Grade 6H (per GB/T 196)

APPLICATION AREA

High-speed rail ballastless track: Sleeper insulated anchoring system (anti-stray current corrosion)  

Medical imaging equipment: Embedded parts for magnetic shielding cabins of MRI equipment  

Precision manufacturing industry: Anti-static equipment bases in semiconductor cleanrooms  

New energy batteries: High-voltage insulated connection points of power battery packs  

Marine engineering: Chloride ion corrosion-resistant fastening systems for wharf facilities

High-Strength Embedded Sleeve for Ballastless Rail and Tunnel Applications

The embedded sleeve crafted from 316 stainless steel is a high-performance solution engineered to meet the extreme demands for mechanical strength and reliability in challenging environments like ballastless track systems and deep tunnel segments. Its design guarantees robust structural fixation and long-term durability for critical infrastructure installations.

The crucial requirement in these infrastructure projects is an extreme mechanical guarantee. The sleeve's material, 316 austenitic stainless steel, provides a high yield strength, ensuring a formidable pull-out force capacity. This superior strength, significantly increased compared to standard materials, is essential for maintaining the secure, permanent fixation of heavy track equipment and tunnel accessories. In tunnel segments, the sleeve acts as a reliable embedded parts anchor for critical elements like external hanging channels, evacuation platforms, and cable brackets, ensuring these life-safety and operational systems remain securely attached under constant vibration and dynamic loads. The special tooth groove structure is engineered to enable high torsional fatigue life, allowing the sleeve to withstand the continuous cyclical stresses associated with passing trains without structural failure.

Beyond mechanical resilience, the embedded sleeve offers dual electrical isolation, a feature vital for high-speed rail ballastless track systems where anti-stray current corrosion is a major concern. The integrated insulation structure, featuring an alumina ceramic insulation layer and a polymer sealing ring, effectively blocks potential leakage current pathways. This electrical isolation prevents stray currents from damaging the rail anchoring system, preserving the structural integrity and avoiding the costly and hazardous effects of electrochemical corrosion.

Finally, the intelligent installation compatibility supports efficient construction and maintenance. The precise internal thread precision allows for seamless integration with automatic torque fastening systems, ensuring accurate and reliable installation. This combination of exceptional mechanical strength, electrical isolation, and high-precision threading makes the 316 stainless steel pre-embedded sleeve the definitive choice for providing lifetime maintenance-free structural solutions in demanding tunnel and rail environments.

SS316 Embedded Sleeve Parts Ensuring Long-Term Corrosion Resistance

The ss316 embedded sleeve parts are specifically designed to provide long-term corrosion resistance, making them the ideal maintenance-free solution for infrastructure exposed to aggressive corrosive media, particularly chloride ions in maritime and tunnel environments. This superior performance is a direct result of the refined material composition and specialized surface treatment.

The foundation of its exceptional resistance lies in the use of 316 austenitic stainless steel. This grade includes Molybdenum in its composition, which is critical for enhancing its defense against localized corrosion, such as pitting and crevice corrosion, which are particularly prevalent in chloride-rich settings. The material is further refined with an ultra-low carbon composition to resist sensitization and degradation, ensuring the sleeve maintains its full anti-corrosion capability against chloride ion corrosion throughout its extensive service life. This resistance is validated by rigorous testing, including prolonged exposure to a salt spray test, affirming its suitability for deployment in corrosive environments like marine engineering and wharf facilities.

This all-environment corrosion resistance is coupled with remarkable thermal stability. The sleeve ensures zero structural embrittlement across a wide temperature range. This eliminates the risk of material failure due to thermal stress, such as cold shrinkage and detachment in extreme cold or structural changes in high heat. This stability is vital for maintaining the physical bond between the sleeve and the surrounding concrete or segment, ensuring the seal remains intact and the material integrity is preserved under all operating conditions.

In addition to preventing material degradation, the ss316 embedded sleeve contributes to system integrity by maintaining dual electrical isolation. This integrated feature, composed of a ceramic layer and polymer seal, prevents the sleeve itself from becoming a conductive pathway for stray currents. By isolating the metal, the risk of electrochemical corrosion—where the metal is consumed by current leakage—is fundamentally mitigated, further extending the component's lifespan and ensuring the long-term reliability of the entire fastening system.

Embedded Sleeve Solutions for MRI and Precision Manufacturing Equipment

embedded sleeve solutions provide specialized, high-reliability fixation for highly sensitive environments such as MRI magnetic shielding cabins and precision manufacturing industry settings like semiconductor cleanrooms. These applications require a unique combination of high mechanical stability, anti-static properties, and non-magnetic materials, which the 316 stainless steel pre-embedded sleeve is engineered to deliver.

A primary application is in medical imaging equipment, specifically the embedded parts for magnetic shielding cabins of MRI equipment. MRI machines rely on powerful magnets and require a highly stable, non-ferrous environment to operate without magnetic interference. As an austenitic stainless steel, the ss316 embedded sleeve exhibits low magnetic permeability, making it suitable for use in proximity to strong magnetic fields without distorting the image or interfering with the equipment's function. Furthermore, the extreme pull-out strength and torque resistance guarantee a rigid and secure base for the heavy shielding structures, ensuring structural safety and stability over time.

In the precision manufacturing industry, the sleeve is used for anti-static equipment bases in semiconductor cleanrooms. Here, the core requirement shifts to electrical isolation and cleanliness. The dual electrical isolation structure, which incorporates ceramic and polymer materials, achieves an extremely high insulation resistance. This electrical separation is critical for preventing static charge build-up or current leakage, which could damage sensitive microelectronic components or interfere with processes within the cleanroom. The low-carbon, highly corrosion-resistant nature of 316 stainless steel also ensures the sleeve is chemically inert and does not shed corrosive particles, which is vital for maintaining the clean environment.

This customized functionality, combined with the assurance of a maintenance-free lifespan and high-precision threading, makes the embedded sleeve an ideal, intelligent solution for supporting advanced and critical technology platforms. Its ability to simultaneously provide extreme mechanical strength and specialized electrical isolation is essential for ensuring the performance and safety of high-end industrial and medical equipment.