Low-temperature environments increase the risk of brittle fracture in fasteners used for pipelines, petrochemical plants, LNG facilities, and high-altitude structures. This article introduces Longshi’s professional fastener solutions designed to ensure bolt safety from –20°C to –60°C.

1. The Challenge of Low-Temperature Bolt Failure

When steel operates below its ductile–brittle transition temperature, it loses toughness rapidly. For pipelines, chemical equipment, and energy projects in extremely cold climates, this may lead to:

• Sudden brittle fracture
• Reduced impact toughness
• Hydrogen embrittlement from certain coatings
• Internal stress caused by improper heat treatment

These failures often occur without visible deformation, making them hard to detect and extremely unsafe.

2. Longshi’s Low-Temperature Fastener Solutions

Longshi specializes in providing engineered fastener solutions for harsh cold conditions. Our approach covers materials, heat treatment, surface technology, and full-process inspection.

2.1 Low-Temperature Materials with Certified Toughness

We select steel grades designed for cold environments, including:

• 35CrMo / 42CrMo / 40CrNiMo
• ASTM A320 L7 / L7M
• A193 B8M Class 2
• Charpy-tested steel for –20°C / –40°C / –60°C

All materials can be supplied with complete MTC documentation.

2.2 Heat Treatment for Controlled Strength and Toughness

Our factory uses controlled quenching and tempering processes to ensure:

• Stable metallographic structure
• Balanced core and surface hardness
• Avoidance of temper brittleness
• Consistent mechanical performance

This prevents bolts from becoming too hard or brittle.

2.3 Surface Treatment Designed for Cold Conditions

To reduce hydrogen embrittlement risk, we provide:

• Mechanical galvanizing
• Zinc-nickel coating
• Dacromet / Geomet
• Hot-dip galvanizing with dehydrogenation baking

These coatings combine corrosion resistance with cold-weather reliability.

2.4 Full Quality Inspection for Every Order

Every batch is tested for:

• Low-temperature impact performance
• Tensile and proof load
• Hardness distribution
• Coating thickness
• Thread accuracy
• Metallographic analysis

This ensures complete traceability and stability for cold-region projects.

3. Application Fields for Low-Temperature Fasteners

Our fastener solutions are widely used in:

• Siberian natural gas pipelines
• Petrochemical low-temperature equipment
• LNG plants and refrigeration units
• High-altitude transmission towers
• Northern European wind turbine structures

These industries require fasteners that perform reliably under extreme temperature conditions.

4. Why Clients Choose Longshi Fasteners

• 16+ years of manufacturing experience
• 60,000 tons annual production capacity
• Full coverage of oil & gas, chemical, and energy industries
• Complete QC system with third-party inspection available
• Engineering-based fastener solutions tailored to project needs

Longshi is not only a manufacturer — we are a provider of high-performance fastener solutions for global industrial projects.

Conclusion

Low-temperature projects require professional engineering solutions to avoid brittle fracture and ensure long-term reliability. With advanced materials, strict heat treatment control, reliable surface technology, and comprehensive testing, Longshi delivers fasteners that maintain toughness and safety even at –60°C.

For customized fastener solutions, visit:
https://www.lsfasteners.com/contact