ASTM A234 Scope
1.1 This specification 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, and
MSS-SP-95. 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 A 960/A 960M.
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 A 216/A 216M and A 217/A 217M.
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 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 in nonconformance with the specification.
GENERAL NOTE: All values are maximum unless otherwise indicated.
Chemical Composition (%) of ASTM A234
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V | Nb |
| WPB | 0.3 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
| WPC | 0.35 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
| WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
| WP11 CL2/3 | 0.05-0.20 | 0.30-0.80 | 0.04 | 0.04 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | -
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