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ASTM A320 Grade L7 –
Low-Temperature Bolting You Can Trust

When engineering meets solidifying temperatures, then not every fastener
can survive. That’s why ASTM A320 Grade L7 bolts are specially planned
for cryogenic and sub-zero applications where failure is not an option.
From LNG terminals to offshore rigs, these bolts hold basic astuteness in
conditions as low as -150°C, without losing quality or ductility.



What Is ASTM A320 Grade L7?
ASTM A320 Grade L7 bolts are made from extinguished and tempered
combination steel, fundamentally utilizing 4140 or 4142 steel, and
particularly designed to meet low-temperature mechanical properties.
They are regularly utilized in combination with ASTM A194 Grade 7 nuts to
total bolted congregations for cold-service pipelines, weight vessels, and
handle frameworks.


Key Mechanical Properties

Property
Value
Minimum Tensile Strength
125 ksi (860 MPa)
Minimum Yield Strength
105 ksi (724 MPa)
Impact Tested Temperature
-50°F (-45°C) or lower
Hardness (Brinell)
Max. 235 HB
Size Range
¼" to 4"

These bolts undergo Charpy V-notch affect testing to confirm durability
at low temperatures, a must for cryogenic applications.

Common Applications
Where you’ll ordinarily see ASTM A320 Grade L7 bolts in action:
● LNG plants and terminals
● Alkali capacity units
● Cryogenic channeling frameworks
● Low-temp refineries
● Seaward oil rigs
● Nourishment handling (refrigerated tanks)

These bolts offer assistance keep up joint reliability in energetic and cold
vibration-prone situations, decreasing chances of fragile break.


Engineering & Installation Considerations

Always confirm impact test reports some time before installation. L7 bolts
without this information can fall flat beneath solidifying push.
● Utilize with Grade 7 heavy hex nuts for rectify stretch compatibility.
● For situations including cyclic weight or warm loads, recheck torque
routinely.
Perfect torqueing is necessary, overtightening can influence tensile quality,
whereas undertightening may cause leakages in flanged joints.


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Documentation & Certification
Each bolt must come with:
● Material Test Certificate (MTC) as per EN 10204 3.1
● Impact test results at required sub-zero temperature
● Dimensional conformance to ASME B18.2.1
Make beyond any doubt to avoid nearby providers that cannot deliver
traceability, it’s not worth the hazard for basic ventures.

ASTM A320 Grade L7 bolts are the spine of low-temperature bolting
frameworks in high-risk, mission-critical situations. On the off chance that
your application includes cold climates or cryogenic capacity, there’s no
more secure elective for long-term joint integrity.

Contacts:-

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