ASTM A774/A774M-14
(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. (A) Other sizes may be furnished provided they comply with all other requirements of this specification. (A) Other thicknesses may be furnished provided they comply with all other requirements of 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.
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Designation:A774/A774M −14
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 designationA774/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
piping and intended for low and moderate temperatures and
2. Referenced Documents
general corrosive service. Users should note that certain
2.1 In addition to those reference documents listed in
corrosiveconditionsmayrestricttheuseofoneormoregrades.
Specification A960/A960M, the following list of standards
For applications requiring a product that requires heat treat-
apply to this specification:
ment or full pressure rating, refer to Specification A403/
2
A403M. The term “fittings” applies to butt and socket welding
2.2 ASTM Standards:
parts such as 45° and 90° elbows, tees, reducers, wyes, laterals,
A240/A240M Specification for Chromium and Chromium-
crosses, and stub ends.
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
Vessels and for General Applications
1.2 Thisspecificationcoversas-weldedfittings3through48
A351/A351M Specification for Castings, Austenitic, for
in. [75 through 1225 mm] in outside diameter and in nominal
Pressure-Containing Parts
wall thicknesses 0.062 through 0.500 in. [1.6 through 12.7
A403/A403M SpecificationforWroughtAusteniticStainless
mm]. Table 1 and Table 2 list the common diameters and
Steel Piping Fittings
nominal thicknesses of fittings in this specification.
A960/A960M Specification for Common Requirements for
1.3 This specification does not apply to cast fittings. Cast
Wrought Steel Piping Fittings
austenitic steel fittings are covered by Specification A351/
E527 Practice for Numbering Metals and Alloys in the
A351M.
Unified Numbering System (UNS)
1.4 Optional supplementary requirements are provided for
2.3 ASME Standard:
3
fittings where a greater degree of examination is desired.These
Section IX ASME Boiler and Pressure Vessel Code
supplementary requirements call for additional tests. When
2.4 MSS Standard:
4
desired, one or more of these may be specified in the order.
SP 43 Wrought Stainless Steel Butt Welding Fittings
1.5 This specification is expressed in both inch-pound units
2.5 AWS Standards:
and in SI units. However, unless the order specifies the A5.4 Corrosion-Resisting Chromium and Chromium-Nickel
5
applicable “M” specification designation (SI units), the mate-
Steel Covered Welding Electrodes
rial shall be furnished to inch-pound units. A5.9 Corrosion-Resisting Chromium and Chromium-Nickel
5
Steel Welding Rods and Bare Electrodes
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
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
system may not be exact equivalents; therefore, each system
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
the ASTM website.
3
Available from American Society of Mechanical Engineers (ASME), ASME
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee www.asme.org.
4
A01.22 on Steel Forgings and Wrought Fittings for PipingApplications and Bolting AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
Materials for Piping and Special Purpose Applications. Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
Current edition approved Oct. 1, 2014. Published October 2014. Originally hq.com.
5
approved in 1980. Last previous edition approved in 2013 as A774/A774M – 13. Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
DOI: 10.1520/A0774_A0774M-14. Miami, FL 33126, http://www.aws.org.
*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−14
2.6 SAE Standard: 4. General Requirements
6
J1086 Unified Numbering System for Metals and Alloys
...
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 − 13 A774/A774M − 14
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*
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.
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:
2
2.2 ASTM Standards:
A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and
for General Applications
A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A403/A403M Specification for Wrought Austenitic Stainless Steel Piping Fittings
A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.3 ASME Standard:
3
Section IX , Welding Qualifications, ASME Boiler and Pressure Vessel Code
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 Oct. 1, 2013Oct. 1, 2014. Published October 2013October 2014. Originally approved in 1980. Last previous edition approved in 20092013 as
A774/A774M – 09.A774/A774M – 13. DOI: 10.1520/A0774_A0774M-13.10.1520/A0774_A0774M-14.
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 the ASTM website.
3
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY 10016-5990,
http://www.asme.org.
*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 − 14
2.4 MSS Standard:
4
SP 43 Wrought Stainless Steel Butt Welding Fittings
2.5 AWS Standards:
5
A5.4 Corrosion-Resisting Chromium and Chromium-Nickel Steel Covered Welding Electrodes
5
A5.9 Corrosion-Resisting Chromium
...
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