ASTM-A758 › Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
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Scope
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? |
30 | normalize | UW-35 | no |
31 | normalize | UW-35 | yes |
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.
Keywords
low; pipe fittings; piping applications; pressure containing parts; steel; temperature service applications; ICS Number Code 23.040.40 (Metal fittings)
To find similar documents by ASTM Volume:
01.01 (Steel--Piping, Tubing, Fittings)
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Document Number
ASTM-A0758_A0758M-14R19
Revision Level
2014 R19 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Dec. 1, 2019
Document Type
Specification
Page Count
5 pages
Committee Number
A01.22