ASTM A774/A774M-24
(Specification)Standard Specification for As-Welded Wrought Austenitic Stainless Steel Fittings for General Corrosive Service at Low and Moderate Temperatures
Standard Specification for As-Welded Wrought Austenitic Stainless Steel Fittings for General Corrosive Service at Low and Moderate Temperatures
ABSTRACT
This specification covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and for low and moderate temperatures and general corrosive service. The fittings shall be made from flat-rolled steel which shall be in the solution annealed condition. The fittings shall be formed by a hot or cold process and shall be welded by a shielded welding process with or without the addition of filler metal. Heat analysis and product analysis shall be performed where in the steel fittings shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, columbium, tantalum, and nitrogen. The steel materials shall also undergo mechanical tests and shall conform to the required values of tensile strength, yield strength, elongation, and hardness.
SCOPE
1.1 This specification covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and intended for low and moderate temperatures and general corrosive service. Users should note that certain corrosive conditions may restrict the use of one or more grades. For applications requiring a product that requires heat treatment or full pressure rating, refer to Specification A403/A403M. The term “fittings” applies to butt and socket welding parts such as 45° and 90° elbows, tees, reducers, wyes, laterals, crosses, and stub ends.
1.2 This specification covers as-welded fittings 3 through 48 in. [75 through 1225 mm] in outside diameter and in nominal wall thicknesses 0.062 through 0.500 in. [1.6 through 12.7 mm]. Table 1 and Table 2 list the common diameters and nominal thicknesses of fittings in this specification.
1.3 This specification does not apply to cast fittings. Cast austenitic steel fittings are covered by Specification A351/A351M.
1.4 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order.
1.5 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.
1.6 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.
1.7 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.
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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: A774/A774M − 24
Standard Specification for
As-Welded Wrought Austenitic Stainless Steel Fittings for
General Corrosive Service at Low and Moderate
1
Temperatures
This standard is issued under the fixed designation A774/A774M; 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* shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the
1.1 This specification covers five grades of as-welded,
standard.
wrought austenitic stainless steel fittings for low-pressure
1.7 This international standard was developed in accor-
piping and intended for low and moderate temperatures and
dance with internationally recognized principles on standard-
general corrosive service. Users should note that certain
ization established in the Decision on Principles for the
corrosive conditions may restrict the use of one or more grades.
Development of International Standards, Guides and Recom-
For applications requiring a product that requires heat treat-
mendations issued by the World Trade Organization Technical
ment or full pressure rating, refer to Specification A403/
Barriers to Trade (TBT) Committee.
A403M. The term “fittings” applies to butt and socket welding
parts such as 45° and 90° elbows, tees, reducers, wyes, laterals,
2. Referenced Documents
crosses, and stub ends.
2.1 In addition to those reference documents listed in
1.2 This specification covers as-welded fittings 3 through 48
Specification A960/A960M, the following list of standards
in. [75 through 1225 mm] in outside diameter and in nominal
apply to this specification:
wall thicknesses 0.062 through 0.500 in. [1.6 through 12.7
2
mm]. Table 1 and Table 2 list the common diameters and
2.2 ASTM Standards:
nominal thicknesses of fittings in this specification.
A240/A240M Specification for Chromium and Chromium-
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
1.3 This specification does not apply to cast fittings. Cast
Vessels and for General Applications
austenitic steel fittings are covered by Specification A351/
A351/A351M Specification for Castings, Austenitic, for
A351M.
Pressure-Containing Parts
1.4 Optional supplementary requirements are provided for
A403/A403M Specification for Wrought Austenitic Stainless
fittings where a greater degree of examination is desired. These
Steel Piping Fittings
supplementary requirements call for additional tests. When
A960/A960M Specification for Common Requirements for
desired, one or more of these may be specified in the order.
Wrought Steel Piping Fittings
E527 Practice for Numbering Metals and Alloys in the
1.5 This specification is expressed in both inch-pound units
Unified Numbering System (UNS)
and in SI units. However, unless the order specifies the
applicable “M” specification designation (SI units), the mate-
2.3 ASME Standard:
3
rial shall be furnished to inch-pound units.
Section IX ASME Boiler and Pressure Vessel Code
2.4 MSS Standard:
1.6 The values stated in either SI units or inch-pound units
4
are to be regarded separately as standard. Within the text, the SP 43 Wrought Stainless Steel Butt Welding Fittings
SI units are shown in brackets. The values stated in each
system may not be exact equivalents; therefore, each system
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, the ASTM website.
3
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Available from American Society of Mechanical Engineers (ASME), ASME
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
Materials for Piping and Special Purpose Applications. www.asme.org.
4
Current edition approved March 1, 2024. Published March 2024. Originally Available from Manufacturers Standardization Society of the Valve and Fittings
approved in 1980. Last previous edition approved in 2019 as A774/A774M – 14 Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
(2019). DOI: 10.1520/A0774_A0774M-24. hq.com.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700,
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A774/A774M − 14 (Reapproved 2019) A774/A774M − 24
Standard Specification for
As-Welded Wrought Austenitic Stainless Steel Fittings for
General Corrosive Service at Low and Moderate
1
Temperatures
This standard is issued under the fixed designation A774/A774M; 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 Scope*
1.1 This specification covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and
intended for low and moderate temperatures and general corrosive service. Users should note that certain corrosive conditions may
restrict the use of one or more grades. For applications requiring a product that requires heat treatment or full pressure rating, refer
to Specification A403/A403M. The term “fittings” applies to butt and socket welding parts such as 45° and 90° elbows, tees,
reducers, wyes, laterals, crosses, and stub ends.
1.2 This specification covers as-welded fittings 3 through 48 in. [75 through 1225 mm] in outside diameter and in nominal wall
thicknesses 0.062 through 0.500 in. [1.6 through 12.7 mm]. Table 1 and Table 2 list the common diameters and nominal thicknesses
of fittings in this specification.
1.3 This specification does not apply to cast fittings. Cast austenitic steel fittings are covered by Specification A351/A351M.
1.4 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These
supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order.
1.5 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.
1.6 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.
1.7 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.
2. Referenced Documents
2.1 In addition to those reference documents listed in Specification A960/A960M, the following list of standards apply to this
specification:
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.22
on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.
Current edition approved Dec. 1, 2019March 1, 2024. Published December 2019March 2024. Originally approved in 1980. Last previous edition approved in 20142019
as A774/A774M – 14.A774/A774M – 14 (2019). DOI: 10.1520/A0774_A0774M-14R19.10.1520/A0774_A0774M-24.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A774/A774M − 24
A
TABLE 1 Common Tubular Fittings Sizes, Outside Diameter
in. [mm] in. [mm]
3
3 [76] 12 ⁄4 [325]
1
3 ⁄2 [90] 14 [355]
4 [100] 16 [405]
1
4 ⁄2 [115] 18 [460]
6 [150] 20 [510]
5
6 ⁄8 [170] 24 [610]
8 [205] 30 [760]
5
8 ⁄8 [220] 36 [915]
10 [255] 40 [1015]
3
10 ⁄4 [275] 42 [1070]
12 [305] 48 [1220]
A
Other sizes may be furnished provided they comply with all other requirements
of this specification.
A
TABLE 2 Common Tubular Fittings Nominal Thicknesses
in. or gauge in. [mm]
16 gauge 0.062 [1.6]
14 gauge 0.078 [2.0]
12 gauge 0.109 [2.8]
11 gauge 0.125 [3.2]
10 gauge 0.140 [3.6]
8 gauge 0.172 [4.4]
3
⁄16 in. 0.187 [4.8]
1
⁄4 in. 0.250 [6.4]
5
⁄16 in. 0.312 [8.0]
3
⁄8 in. 0.375 [9.5]
1
⁄2 in. 0.500 [12.5]
A
Other thicknesses may be furnished provided they comply with all other
requirements of this specification.
2
2.2 ASTM Standards:
A240/A240M Specifica
...
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