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Alloy A320 L7 L7M Washers used for bolting pressure vessels

The term “bolting material” as used in this specification covers, rolled, forged or strain hardened bars, bolts, washers, screws, studs and stud bolts.

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ASTM A320 specification covers alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low-temperature service. Each alloy shall conform to the prescribed chemical composition requirements. This is the most common A320 bolt grade. A320 Grade L7 bolts and threaded studs are manufactured from alloy steel with chromium, manganese, and molybdenum. The bolts undergo a heat treating process to reach their required mechanical properties. These are used with pressure valves, pressure vessels, boilers and other application bolts. The ASTM A320 Grade L7 Studs come in four different classes. They can be of Class A, B, C or D. The difference in the class is mainly the tensile strength. The classes A, B and C have 895MPa minimum tensile strength and 585MPa minimum yield strength.

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