ASTM A234.pdf

Standard Specification for
Piping Fittings of Wrought Carbon Steel and Alloy Steel for
Moderate and High Temperature Service1

This specification2 covers wrought carbon steel and
alloy steel fittings of seamless and welded construction covered
by the latest revision of ASME B16.9, B16.11, MSS-SP-79,
MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are
for use in pressure piping and in pressure vessel fabrication for
service at moderate and elevated temperatures. Fittings differing
from these ASME and MSS standards shall be furnished in
accordance with Supplementary Requirement S58 of Specification
A960/A960M.
1.2 Optional supplementary requirements are provided for
fittings where a greater degree of examination is desired. When
desired, one or more of these supplementary requirements may
be specified in the order.
1.3 This specification does not cover cast welding fittings or
fittings machined from castings. Cast steel welding fittings are
governed by Specifications A216/A216M and A217/A217M.
1.4 This specification is expressed in both inch-pound units
and in SI units. However, unless the order specifies the
applicable “M” specification designation (SI units), the material
shall be furnished to inch-pound units.
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system may not be exact equivalents; therefore, each system
shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the
standard.
2. Referenced Documents
2.1 In addition to those reference documents