Fasteners Common Materials

8/12/2019 Fasteners Common Materials

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ASTM A320, Grade L7 - This grade is intended for low-temperature service down to minus150F and has a minimum Charpy impact value of 15 ft-lb at this temperature. Sizes 2-1/2 in. and under.

ASTM A320 L43

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 prescribedchemical composition requirements. The material, as represented by the tensionspecimens, shall conform to the requirements as to tensile properties such as tensilestrength, yield strength, elongation, and hardness. The material shall meet the prescribedimpact energy absorption requirements and the recommended test temperature.According to ASTM A320 mechanical tests shall be conducted on the material, namely:impact testing, tension testing, and hardness testing. Inside ASTM A320 several gradesare covered, including both ferritic and austenitic steels designated L7, B8, etc. Selection

will depend on design, service conditions, mechanical properties, and low-temperaturecharacteristics The values stated in either inch-pound units or SI units are to be regardedseparately as standard. Within the text, the SI units are shown in brackets. The valuesstated in each system are not exact equivalents; therefore, each system must be usedindependently of the other. Combining values from the two systems may result innonconformance with the specification. Like the ASTM A193 specification, unlessotherwise specified, the 8UN thread series is specified on fastener larger than 1'' indiameter.

ASTM A320, Grade L43 - The same properties offered by Grade L7 in sizes up to 2-1/2are obtainable up to 4 in. in Grade L43.

ASTM A193 B16

ASTM A193 specification covers alloy steel and stainless steel bolting material forpressure vessels, valves, flanges, and fittings for high temperature or high pressureservice, or other special purpose applications.Several grades are covered, including ferriticsteels and austenitic stainless steels designated B5, B8, and so forth. Selection willdepend upon design, service conditions, mechanical properties, and high temperaturecharacteristics.Material according to ASTM A193 B7 is often available in national coarse(UNC) thread pitches, if being used in traditional applications, threads are specified 8

threads per inch (tpi) for diameters above one inch.Below is a summary of a few of thecommon grades.

ASTM A193, Grade B16 - a heat-treated chromium-molybdenum-vanadium steel for high-pressure, high-temperature service.

A193 B8

ASTM A193 specification covers alloy steel and stainless steel bolting material forpressure vessels, valves, flanges, and fittings for high temperature or high pressure

service, or other special purpose applications.Several grades are covered, including ferriticsteels and austenitic stainless steels designated B5, B8, and so forth. Selection willdepend upon design, service conditions, mechanical properties, and high temperature


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