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Ningbo L7 Screw
QS Fastener: Ningbo L7 Screw
Name: Ningbo L7 Screw
Standard: ASTM
Material: A320 L7
Size: M6 to M100
Total Length: 30 to 1000 mm
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASTM
Material: A320 L7
Size: M6 to M100
Total Length: 30 to 1000 mm
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
The Ningbo L7 Screw represents a critical fastening solution engineered for extreme low-temperature environments. Manufactured from chromium-molybdenum alloy steel and quenched and tempered to meet rigorous ASTM standards, this screw delivers exceptional performance where conventional fasteners would fail.
Mechanical Properties
The L7 grade demonstrates remarkable mechanical characteristics that distinguish it in demanding applications. With minimum tensile strength of 125 ksi (862 MPa) and yield strength of 105 ksi (724 MPa), these fasteners provide the reliability required in high-pressure and heavy-load conditions. The material exhibits minimum elongation of 16% and reduction of area of 50%, indicating excellent ductility and fracture resistance.
The L7 grade demonstrates remarkable mechanical characteristics that distinguish it in demanding applications. With minimum tensile strength of 125 ksi (862 MPa) and yield strength of 105 ksi (724 MPa), these fasteners provide the reliability required in high-pressure and heavy-load conditions. The material exhibits minimum elongation of 16% and reduction of area of 50%, indicating excellent ductility and fracture resistance.
The defining feature of the Ningbo L7 screw is its exceptional low-temperature impact toughness, maintaining minimum 20 ft-lbf at -101°C (-150°F). This ensures structural integrity in cryogenic conditions, making it the preferred choice for liquefied natural gas facilities, polar engineering projects, and low-temperature equipment.
Application Scenarios
These fasteners find extensive application across multiple industries: oil and gas pipeline connections, pressure vessels and valve assemblies, chemical processing equipment, and critical structural connections requiring low-temperature reliability. Specifications range from M6 to M100 with total lengths from 30 to 1000 mm.
These fasteners find extensive application across multiple industries: oil and gas pipeline connections, pressure vessels and valve assemblies, chemical processing equipment, and critical structural connections requiring low-temperature reliability. Specifications range from M6 to M100 with total lengths from 30 to 1000 mm.
Ningbo's Fastener Industry Advantage
Ningbo has established itself as a powerhouse in the global fastener industry. The city contributes approximately 12.3% of China’s total fastener production, with industry output reaching 420 billion yuan in 2024. The sector’s export volume exceeds 2.16 billion USD, covering over 180 countries worldwide. The Zhenhai district, home to more than 100 fastener enterprises including national manufacturing champions and specialized"little giant"firms, has witnessed 35.9 billion yuan in industrial output from fastener manufacturing alone.
Ningbo has established itself as a powerhouse in the global fastener industry. The city contributes approximately 12.3% of China’s total fastener production, with industry output reaching 420 billion yuan in 2024. The sector’s export volume exceeds 2.16 billion USD, covering over 180 countries worldwide. The Zhenhai district, home to more than 100 fastener enterprises including national manufacturing champions and specialized"little giant"firms, has witnessed 35.9 billion yuan in industrial output from fastener manufacturing alone.
Quality Assurance
Ningbo manufacturers leverage advanced production facilities and rigorous quality control systems. Products undergo comprehensive mechanical testing including tensile, impact, and hardness verification to ensure compliance with ASTM A320 specifications. The L7 screw from Ningbo represents the culmination of decades of manufacturing expertise combined with modern production technology, delivering reliable fastening solutions for the world's most challenging low-temperature applications.
Ningbo manufacturers leverage advanced production facilities and rigorous quality control systems. Products undergo comprehensive mechanical testing including tensile, impact, and hardness verification to ensure compliance with ASTM A320 specifications. The L7 screw from Ningbo represents the culmination of decades of manufacturing expertise combined with modern production technology, delivering reliable fastening solutions for the world's most challenging low-temperature applications.
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