Products Features
ðĐ 1. Material Selection
In high-temperature environments (>200â), 42CrMo chromium-molybdenum alloy steel (such as A193 B7) should be used. It can withstand temperatures up to 480â and has a tensile strength of âĨ860 MPa.
Extremely cold environment (<-50â) recommends A320 L7 material with nickel-chromium-molybdenum composite strengthening.
ð§ 2. Anti-Loosening Technology
The wedge-shaped lock washers (such as the Nord-Lock system) are used. The geometric structure with a slope angle greater than the thread rise angle is adopted to prevent vibration loosening. And the radial fine teeth form indentations on the contact surface.
The creep vibration test is used to verify its anti-loosening performance and is applicable to scenarios with dynamic loads such as wind turbine towers and ship decks.
Industry Applications
Certified Shipbuilding Fasteners are specialized fasteners rigorously certified by international ship classification societies (such as DNV, ABS, LR, etc.).
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(1) Ship Structure Connection
Bolt/nut combinations for decks, bulkheads, and keels. Standards: ISO 3506-3 (salt spray resistance âĨ 720 hours).
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(2) Power System Fixed
Main unit base bolts with dynamic load resistance (tensile strength âĨ 800 MPa), typically 316L stainless steel.
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(3) Offshore Platform Construction
Mooring frame components passing -40â low-temperature impact tests (DNV-OS-C501 specification).
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(4) LNG Storage Tank Installation
Low-temperature flange bolts made of nickel-based alloys (Inconel 718) for -196â environments.
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(5) Dock Mooring System
Self-locking nuts (torque attenuation rate âĪ 5%) made from duplex stainless steel 2205.
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(6) Offshore Wind Turbine Tower
Foundation ring bolts meeting ISO 4014 (M24âM64) with shear strength âĨ 600 MPa.
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(7) Tidal Energy Device
Underwater fasteners with bio-adhesion protection (coating thickness âĨ 50 Ξm).
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(8) Cross-Sea Bridge Fixation
Prestressed anchor components passing 2 million fatigue tests (EN 1090 standard).
Frequently Asked Questions
QWhat materials are recommended for fasteners in high-temperature environments above 200â?
For environments exceeding 200â, 42CrMo chromium-molybdenum alloy steel (such as A193 B7) is recommended. It withstands up to 480â with a tensile strength of âĨ860 MPa.
QHow do wedge-shaped lock washers prevent loosening under vibration?
They use a geometric structure where the slope angle exceeds the thread rise angle. Combined with radial teeth, they mechanically resist loosening caused by dynamic loads, verified via creep vibration testing.
QWhich classification societies certify these shipbuilding fasteners?
Major international societies including DNV, ABS, and LR certify these components. They ensure compliance with standards like ISO 3506-3 and DNV-OS-C501.
QWhat material is suitable for LNG storage tanks at -196â?
Nickel-based alloys such as Inconel 718 are recommended. These materials maintain structural integrity and sealing performance under extreme cryogenic conditions.
QWhat are the anti-corrosion requirements for underwater tidal fasteners?
They must undergo bio-adhesion protection treatment with a coating thickness of âĨ50 Ξm to prevent marine organism attachment and corrosion in submerged environments.
QWhat fatigue tests are required for cross-sea bridge anchor fixation?
Prestressed components must complete 2 million fatigue cycle tests and comply with the EN 1090 standard to ensure long-term structural reliability.
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