ASTM A320 Grade L7, ASTM A320 Grade L7 Bolt, Nuts, ASTM A240 Bolt Manufacturer in India – Ananka Group

The ASTM A320 Grade L7 specification was developed for low-temperature bolting materials in use for pressure vessels, valves, flanges, and fittings. The standard is included under the ASTM A320 specification, which offers specifications for alloy and stainless steel bolting materials that should be employed at low temperatures. Grade L7 bolts are chromium-molybdenum steel alloyed specifically for use where strength and toughness at cryogenic temperature are involved, such as in the oil and gas, petrochemical, or cryogenic processing industry.

ASTM A320 Grade L7: Composition and Application

ASTM A320 Grade L7 bolts are made from chromium-molybdenum steel, with compositions typically including:

Chromium Content: The protective oxide film prevents the corrosion of the metal base and enhances hardenability

Molybdenum Content: Molybdenum enhances strength, hardness, and significantly toughness at low temperatures.

Carbon: Strength and hardness are provided, but it is limited by balancing the toughness with the toughness needs. Bolts are heat treated, quenched, and tempered in order to achieve mechanical properties.

Hence, the treatments will be selected by controlling the heat treatment sequences so that the bolts could preserve high tensile and yield strength properties with the amount of toughness needed in the cryogenic applications.

Advantages of ASTM A320 Grade L7 Bolts:

Low-Temperature Toughness: L7-grade bolts are designed to perform at low temperature, with toughness and structural integrity retained right down to -150°F (-101°C). They are thus suitable for cryogenic as well as very low temperatures.

High Strength and Integrity: Such a heat-treated condition for Grade L7 bolting assures tensile and yield strength due to the presence of chromium and molybdenum, so as to ensure reliable performance under stress within pressure vessels and flanges.

High Corrosion Resistance: Not nearly as corrosion-resistant as stainless steel, Grade L7 bolts contain chromium that still provides a reasonable resistance to oxidation and corrosion for many industrial applications.

Versatile: Used with ASTM A194 Grade 7 nuts, Grade L7 bolts provide a safe, compatible bolting solution for many applications requiring or subjecting bolting to low temperatures.

Applications for Grade L7 Bolts:

Low-Temperature Processing Plants and Equipment

Low-Temperature Pressure Vessels, Flanges, and Fittings

Oil and gas equipment, including pipeline and valve set

Refrigeration systems and components

Petrochemicals plants that exist in low temperatures

ASTM A320 grade L7 bolts are the best for applications where the criteria are based on strength and toughness with a high level of resistance to low temperatures. Since they do not have to be withdrawn from service when mechanically stressed to subzero temperatures, these very components form an indispensable part of various low-temperature industries that are required to offer safety and strength.

ASTM A320 Grade L7 Chemical Composition

We are known as top-quality L7 Fasteners Manufacturer in India. The Chemical Composition with its Carbon, Phosphorus, Silicon and other composition details mention below.