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PTFE Coated Stud Bolt and Nut
QS Fastener: PTFE Coated Stud Bolt and Nut
Name: PTFE Coated Stud Bolt and Nut
Finish: Blue XYLAN 1424 Coating
Standard: ASME B18.31.2
Type: Flange Bolt and Nut
Material: ASTM A193 B16 Bolt, ASTM A194 7 Hex Heavy Nut
Size: 1-3/4 Inch
Length: 180 mm
Application: For Seawater Pipeline Service
Finish: Blue XYLAN 1424 Coating
Standard: ASME B18.31.2
Type: Flange Bolt and Nut
Material: ASTM A193 B16 Bolt, ASTM A194 7 Hex Heavy Nut
Size: 1-3/4 Inch
Length: 180 mm
Application: For Seawater Pipeline Service
Quantity
The PTFE Coated Stud Bolt and Nut features a blue XYLAN 1424 (PTFE composite coating) surface treatment, delivering exceptional corrosion resistance, particularly suited for high-salinity, high-pressure seawater pipeline environments. With a specification of 1-3/4"×180mm and manufactured in compliance with ASME B18.31.2 standards, it ensures superior sealing performance and long-term stability in flange connections.
The PTFE Coated Stud Bolt and Nut not only provides outstanding rust protection but also resists chemical corrosion and withstands temperatures up to 280℃, making it an ideal choice for demanding applications such as marine engineering and petrochemical industries. Customization is available based on project requirements.
Characteristics of PTFE Coated Stud Bolt and Nut
1. Chemical Stability (Chemical Inertness)
The coating of PTFE Coated Stud Bolt and Nut has a fully fluorinated carbon chain structure (-CF₂-)n, forming the strongest known carbon-fluorine bond (bond energy: 485 kJ/mol). Its properties include:
- Resistance to Strong Acids/Alkalis: Withstands 98% concentrated sulfuric acid, 36% hydrochloric acid, and 40% hydrofluoric acid (annual corrosion rate <0.01mm at 25℃).
1. Chemical Stability (Chemical Inertness)
The coating of PTFE Coated Stud Bolt and Nut has a fully fluorinated carbon chain structure (-CF₂-)n, forming the strongest known carbon-fluorine bond (bond energy: 485 kJ/mol). Its properties include:
- Resistance to Strong Acids/Alkalis: Withstands 98% concentrated sulfuric acid, 36% hydrochloric acid, and 40% hydrofluoric acid (annual corrosion rate <0.01mm at 25℃).
- Immunity to Organic Solvents: Resists over 300 solvents, including acetone and xylene (only perfluoroethers cause swelling).
- Lattice Stability: Maintains β-crystalline phase structure within -200℃ to 260℃ (DSC testing shows no phase transition peaks).
2. Surface Properties
The coating of PTFE Coated Stud Bolt and Nut exhibits unique microtopological characteristics:
- Non-Adhesive: Contact angles of 118° (water)/95° (oil), with surface energy as low as 18mN/m (ASTM D7334).
The coating of PTFE Coated Stud Bolt and Nut exhibits unique microtopological characteristics:
- Non-Adhesive: Contact angles of 118° (water)/95° (oil), with surface energy as low as 18mN/m (ASTM D7334).
- Self-Lubrication Mechanism: Achieved through PTFE molecular chain slip layers (friction coefficient: 0.05–0.12, 80% lower than uncoated parts).
- Microscopic Morphology: AFM testing reveals worm-like structures at 10–100nm scales (Ra controlled at 0.2–0.8μm).
3. Tribological Performance
The PTFE Coated Stud Bolt and Nut excels under boundary lubrication conditions:
- PV Limit Breakthrough: Up to 3.5 N/mm²·m/s (dry friction), increasing to 6.8 with 15% glass fiber reinforcement.
The PTFE Coated Stud Bolt and Nut excels under boundary lubrication conditions:
- PV Limit Breakthrough: Up to 3.5 N/mm²·m/s (dry friction), increasing to 6.8 with 15% glass fiber reinforcement.
- Wear Mechanism: Primarily molecular-layer transfer wear (transfer film thickness ~50nm, SEM shows continuous film).
- Special Condition Adaptability:
- Stable friction coefficient of 0.08±0.02 in vacuum (10⁻⁶Pa).
- No electrochemical corrosion in humid environments (RH95%).
- Stable friction coefficient of 0.08±0.02 in vacuum (10⁻⁶Pa).
- No electrochemical corrosion in humid environments (RH95%).
4. Thermal Performance
The PTFE Coated Stud Bolt and Nut displays unique thermal response properties:
- Thermal Conductivity/Insulation Balance: Thermal conductivity 0.25 W/(m·K) but breakdown strength >60 kV/mm.
- Thermal Expansion: CTE of (10–13)×10⁻⁵/℃ (20–100℃), achieving 92% compatibility with steel.
- High-Temperature Behavior: Decomposition temperature >400℃ (5% weight loss point in TGA).
The PTFE Coated Stud Bolt and Nut displays unique thermal response properties:
- Thermal Conductivity/Insulation Balance: Thermal conductivity 0.25 W/(m·K) but breakdown strength >60 kV/mm.
- Thermal Expansion: CTE of (10–13)×10⁻⁵/℃ (20–100℃), achieving 92% compatibility with steel.
- High-Temperature Behavior: Decomposition temperature >400℃ (5% weight loss point in TGA).
5. Electrical Performance
The PTFE Coated Stud Bolt and Nut is an ideal insulating/dielectric material:
- Volume Resistivity: >10¹⁷ Ω·cm (GB/T 1410).
- Dielectric Constant: 2.0–2.1 (1MHz, IEC 60250).
- Arc Resistance: >200 seconds (ASTM D495).
The PTFE Coated Stud Bolt and Nut is an ideal insulating/dielectric material:
- Volume Resistivity: >10¹⁷ Ω·cm (GB/T 1410).
- Dielectric Constant: 2.0–2.1 (1MHz, IEC 60250).
- Arc Resistance: >200 seconds (ASTM D495).
6. Environmental Adaptability
The PTFE Coated Stud Bolt and Nut passes rigorous environmental tests:
- UV Aging: ΔE <1 after 3000 hours of QUV testing (ISO 4892-3).
- Salt Spray Corrosion: 5000 hours without substrate corrosion (coating porosity <0.3%).
- Bioinertness: ISO 10993 biocompatibility certified.
The PTFE Coated Stud Bolt and Nut passes rigorous environmental tests:
- UV Aging: ΔE <1 after 3000 hours of QUV testing (ISO 4892-3).
- Salt Spray Corrosion: 5000 hours without substrate corrosion (coating porosity <0.3%).
- Bioinertness: ISO 10993 biocompatibility certified.
Precautions
The coating system has limitations: cold flow (creep rate 0.5%/100h under >30MPa load) and radiation sensitivity (molecular chain breakage at >10⁴Gy doses). These are mitigated by >70% through nanofillers (e.g., graphene, BN). Recent studies show ion beam-assisted deposition can produce ultra-thin coatings (3μm) with 8x longer service life for higher-end PTFE Coated Stud Bolt and Nut applications.
The coating system has limitations: cold flow (creep rate 0.5%/100h under >30MPa load) and radiation sensitivity (molecular chain breakage at >10⁴Gy doses). These are mitigated by >70% through nanofillers (e.g., graphene, BN). Recent studies show ion beam-assisted deposition can produce ultra-thin coatings (3μm) with 8x longer service life for higher-end PTFE Coated Stud Bolt and Nut applications.
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