ASTM A758/A758M-14(2019)
(Specification)Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
ABSTRACT
This guide covers standard specification for wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness. Heat treatment shall be required for all types of fittings. Fittings with mandatory radiographic examination of welds shall be included. Cast fittings and fittings formed from all weld metal, shall not be included. Heat or cast analysis shall be conducted wherein the material shall conform to the required chemical components for carbon, manganese, phosphorus, sulfur, silicon, vanadium, chromium, nickel, molybdenum, copper, and lead. The fittings, as represented by tensile test specimens taken subsequent to final heat treatment, shall conform to the specified values of tensile strength, yield strength, and elongation for the applicable grades of steel. Mechanical tests such as tension test and transverse guided weld bend test shall be performed on the fittings.
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 B16.9.
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 (5.3.2)
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 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.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A758/A758M −14 (Reapproved 2019)
Standard Specification for
Wrought-Carbon Steel Butt-Welding Piping Fittings with
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Improved Notch Toughness
This standard is issued under the fixed designationA758/A758M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope SI units are shown in brackets. The values stated in each
system may not be exact equivalents; therefore, each system
1.1 This specification covers wrought-carbon steel butt-
shall be used independently of the other. Combining values
welding seamless or welded fittings specially processed to
from the two systems may result in non-conformance with the
ensure better notch toughness than that to be expected in
standard.
fittings manufactured to the requirements of Specification
A234/A234M.
1.6 This international standard was developed in accor-
1.1.1 Included are elbows, caps, tees, reducers, and other
dance with internationally recognized principles on standard-
type fittings covered by ASME B16.9.
ization established in the Decision on Principles for the
1.1.2 Heat treatment is required for all fittings.
Development of International Standards, Guides and Recom-
1.1.3 Fittings with mandatory radiographic examination of
mendations issued by the World Trade Organization Technical
welds are included.
Barriers to Trade (TBT) Committee.
1.1.4 Supplementary requirements are provided for use
when additional testing or examination is desired.
2. Referenced Documents
1.1.5 Cast fittings, and fittings formed from all weld metal,
2.1 In addition to those reference documents listed in
are not included.
Specification A960/A960M, the following list of standards
1.2 Several type of fittings are provided, as follows:
apply to this specification:
Heat Treatment Weld Seam Radiography
2
Type Required Finish (5.3.2) Required?
2.2 ASTM Standards:
A234/A234M Specification for Piping Fittings of Wrought
30 normalize UW-35 no
31 normalize UW-35 yes
Carbon Steel and Alloy Steel for Moderate and High
32 normalize UW-35 and ground flush yes
Temperature Service
40 normalize and temper UW-35 no
A275/A275M Practice for Magnetic Particle Examination of
41 normalize and temper UW-35 yes
42 normalize and temper UW-35 and ground flush yes
Steel Forgings
50 quench and temper UW-35 no
A960/A960M Specification for Common Requirements for
51 quench and temper UW-35 yes
Wrought Steel Piping Fittings
52 quench and temper UW-35 and ground flush yes
E165 Practice for Liquid Penetrant Testing for General
1.3 It shall be the responsibility of the purchaser to deter-
Industry
mine whether material meeting the requirements of this speci-
E709 Guide for Magnetic Particle Testing
fication is satisfactory for the service application.
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2.3 ASME Boiler and Pressure Vessel Code (ASME Code):
1.4 This specification is expressed in both inch-pound units
Section VIII, Division 1
and SI units. However, unless the order specifies the applicable
Section IX
“M” specification designation (SI units), the material shall be
furnished to inch-pound units.
2.4 ASME Standard:
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B16.9 Standards for Steel Butt-Welding Fittings
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. Within the text, the
1 2
This specification is under the jurisdiction ofASTM Committee A01 on Steel, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A01.22 on Steel Forgings andWrought Fittings for PipingApplications and Bolting Standards volume information, refer to the standard’s Document Summary page on
Materials for Piping and Special Purpose Applications. the ASTM website.
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Current edition approved Dec. 1, 2019. Published December 2019. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1978. Last previous edition approved in 2014 as A758/A758M – 14. International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
DOI: 10.1520/A0758_A0758M-14R19. www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A758/A758M−14 (2019)
2.5 ASNT Standard: 5.4.3 Types 50, 51, and 52 fittings shall be quenched-and-
SNT-TC-1A Practice for Nondestructive Examination Per- tempered by uniformly
...
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