SUPERSEDED (click for Active standard)
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1.1 This specification covers wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness than that to be expected in fittings manufactured to the requirements of Specification A234/A234M.
1.1.1 Included are elbows, caps, tees, reducers, and other type fittings covered by ASME B 16.9.
1.1.2 Heat treatment is required for all fittings.
1.1.3 Fittings with mandatory radiographic examination of welds are included.
1.1.4 Supplementary requirements are provided for use when additional testing or examination is desired.
1.1.5 Cast fittings, and fittings formed from all weld metal, are not included.
1.2 Several type of fittings are provided, as follows:
|Type||Heat Treatment Required||Weld Seam Finish (||Radiography Required?|
|32||normalize||UW-35 and ground flush||yes|
|40||normalize and temper||UW-35||no|
|41||normalize and temper||UW-35||yes|
|42||normalize and temper||UW-35 and ground flush||yes|
|50||quench and temper||UW-35||no|
|51||quench and temper||UW-35||yes|
|52||quench and temper||UW-35 and ground flush||yes|
1.3 It shall be the responsibility of the purchaser to determine whether material meeting the requirements of this specification is satisfactory for the service application.
1.4 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.
1.5 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A234/A234M Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
ICS Number Code 23.040.40 (Metal fittings)
UNSPSC Code 40170000(Pipe piping and pipe fittings)
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ASTM A758 / A758M-00, Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness, ASTM International, West Conshohocken, PA, 2000, www.astm.orgBack to Top