ASTM A774/A774M-06
(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 A 403/A 403M. 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]. and 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 A 351/A 351M.
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 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.
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Designation: A774/A774M – 06
Standard Specification for
As-Welded Wrought Austenitic Stainless Steel Fittings for
General Corrosive Service at Low and Moderate
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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* 2. Referenced Documents
1.1 This specification covers five grades of as-welded, 2.1 In addition to those reference documents listed in
wrought austenitic stainless steel fittings for low-pressure Specification A960/A960M, the following list of standards
piping and intended for low and moderate temperatures and apply to this specification:
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general corrosive service. Users should note that certain 2.2 ASTM Standards:
corrosiveconditionsmayrestricttheuseofoneormoregrades. A240/A240M Specification for Chromium and Chromium-
For applications requiring a product that requires heat treat- Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
ment or full pressure rating, refer to Specification A403/ Vessels and for General Applications
A403M. The term “fittings” applies to butt and socket welding A351/A351M Specification for Castings, Austenitic, for
parts such as 45° and 90° elbows, tees, reducers, wyes, laterals, Pressure-Containing Parts
crosses, and stub ends. A403/A403M Specification for Wrought Austenitic Stain-
1.2 Thisspecificationcoversas-weldedfittings3through48 less Steel Piping Fittings
in. [75 through 1225 mm] in outside diameter and in nominal A960/A960M Specification for Common Requirements for
wall thicknesses 0.062 through 0.500 in. [1.6 through 12.7 Wrought Steel Piping Fittings
mm]. Table 1 and Table 2 list the common diameters and E527 Practice for Numbering Metals and Alloys in the
nominal thicknesses of fittings in this specification. Unified Numbering System (UNS)
1.3 This specification does not apply to cast fittings. Cast 2.3 ASME Standard:
austenitic steel fittings are covered by Specification A351/ Section IX , Welding Qualtifications, ASME Boiler and
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A351M. Pressure Vessel Code
1.4 Optional supplementary requirements are provided for 2.4 MSS Standard:
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fittings where a greater degree of examination is desired.These SP 43 Wrought Stainless Steel Butt Welding Fittings
supplementary requirements call for additional tests. When 2.5 AWS Standards:
desired, one or more of these may be specified in the order. A5.4 Corrosion-Resisting Chromium and Chromium-
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1.5 This specification is expressed in both inch-pound units Nickel Steel Covered Welding Electrodes
and in SI units. However, unless the order specifies the A5.9 Corrosion-Resisting Chromium and Chromium-
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applicable “M” specification designation (SI units), the mate- Nickel Steel Welding Rods and Bare Electrodes
rial shall be furnished to inch-pound units. 2.6 SAE Standard:
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1.6 The values stated in either inch-pound units or SI units J1086 Unified Numbering System for Metals and Alloys
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
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
two systems may result in nonconformance with the specifi-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cation.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Available from American Society of Mechanical Engineers (ASME), ASME
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This specification is under the jurisdiction of ASTM Committee A01 on Steel, International Headquarters, Three Park Ave., New York, NY 10016-5990.
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Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
A01.22 on Steel Forgings and Wrought Fittings for PipingApplications and Bolting Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.
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Materials for Piping and Special Purpose Applications. Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
Current edition approved March 1, 2006. Published March 2006. Originally Miami, FL 33126.
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approved in 1980. Last previous edition approved in 2002 as A774/A774M – 02. Available from Society of Automotive Engineers (SAE), 400 Commonwealth
DOI: 10.1520/A0774_A0774M-06. Dr., Warrendale, PA 15096-0001.
*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.
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