ASTM A193, Grade B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
MATERIALS-STUDBOLTS ASTM A193 B8
ASTM A193 specification covers alloy steel and stainless steel bolting material
for pressure vessels, valves, flanges, and fittings for high temperature or high
pressure service, or other special purpose applications.Several grades are
covered, including ferritic steels and austenitic stainless steels designated B5, B8,B8M
and so forth. Selection will depend upon design, service conditions, mechanical properties, and high temperature characteristics.Material according to
ASTM A193 B8M 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.