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ASTM A181.pdf

Standard Specification for
Carbon Steel Forgings, for General-Purpose Piping

1.1 This specification2 covers nonstandard as-forged
fittings, valve components, and parts for general service.
Forgings made to this specification are limited to a maximum
weight of 10 000 lb [4540 kg]. Larger forgings may be ordered
to Specification A266/A266M.
1.2 Two classes of material are covered, designated as
Classes 60 and 70, respectively, and are classified in accordance
with their mechanical properties as specified in 6.1.
1.3 This specification is expressed in both inch-pound units
and SI units. However, unless the order specifies the applicable
“M” specification designation (SI units), the material shall be
furnished to inch-pound units.
1.4 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
two systems may result nonconformance with the specification.