Stainless Steel Pipes1
Seamless Welded and HeavilyColdWorkedAustenitic StandardSpecificationfor
This standard i isued under the fised designation A312/A312M; the mmber immediately following the designatioe indicates the yearof original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reaproval. A supersript epsil (e) indates an eioial change since the last revisi or reapproval.
1. Scope*
been substituted in this standard for such traditional terms as “nominal Nore 1The dimensionles designator NPS (nominal pipe size) hasdiameter ” “size ”° and “nominal size.”
1.1 This specification² covers seamless straight-seamwelded and heavily cold worked welded austenitic stainlesssteel pipe intended for high-temperature and general corrosive service.
1.7 This interncrional stcncdard was developed in accor-dance with internationally recognized principles on stondord-Development of Internarional Standards Guides and Re- ization established in the Decision on Principles for themendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Commintee.
1.2 Grades TP304H TP309H TP309HCb TP310H TP310HCb TP316H TP321H TP347H and TP348H are modifications of Grades TP304 TP309Cb TP309S TP310Cb TP310S TP316 TP321 TP347 and TP348 and are intendedproperties are important.
2.Referenced Documents
2.1 ASTM Standords:3
pipe where a greater degree of testing is desired. These 1.3 Optional supplementary requirements are provided forsupplementary requirements callfor additional tests to be made and when desired it is permitted to specify in the order one ormore of these supplementary requirements.
A262 Practices for Detecting Susceptibility to IntergranularA370 Test Methods and Definitions for Mechanical Testing Attack in Austenitic Stainless SteelsA941 Terminology Relating to Steel Stainless Steel Related of Steel ProductsAlloys and FerroalloysA999/A999M Specification for General Requirements for Alloy and Stainless Steel PipeA1016/A1016M Specification for General Requirements for Ferritic Alloy Steel Austenitic Alloy Steel and StainlessSteel TubesE112 Test Methods fox Determining Average Grain Size E381 Method of Macrcetch Testing Steel Bars Billets E527 Practice for Numbering Metals and Alloys in the Blooms and ForgingsUnified Numbering System (UNS)
and seamless stainless steel pipe as shown in ASME B36.19. 1.4 Table X1.1 lists the standardized dimensions of weldedThese dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be orderedand furnished provided such pipe plies with all otherrequirements of this specification.
1.5 Grades TP321 and TP321H have lower strength require-nominal wall thicknesses greater than %s in. [9.5 mm]. ments for pipe manufactured by the seamless process in
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 eachsystem may not be exact equivalents; therefore each systemshall be used independently of the other. Combining values from the two systems may result in non-conformance with thestandard. The inch-pound units shall apply unless the *M" designation of this specification is specified in the order.
3. Terminology
3.1 Definitions:
4. Ordering Information
5. General Requirements
6. Materials and Manufacture
6.1 Manafacture:
2.3 AWS Standard:A5.9 Corrosion-Resisting Chromium and Chromium-Nickel2.4 Other Standard: Steel Welding Rods and ElectrodesSAE J1086 Practice for Numbering Metals and Alloys (UNS)6
Terminology A941 are applicable to this specification. 3.1.1 The definitions in Specification A999/A999M and
4.1 Orders for material to this specification shall conform tothe requirements of the current edition of Specification A999/ A999M.
5.1 Material furmished under this specification shall con-form to the applicable requirements of the curent edition of Specification A999/A999M unless otherwise provided herein.
ing processes: 6.1.1The pipe shall be manufactured by one of the follow-
does not involve welding at any stage of production. 6.1.2 Seamless (SML) pipe shall be made by a process that
6.1.3 Welded (WLD) pipe shall be made using an automaticwelding process. welding process with no addition of filler metal during the
applying cold working of not less than 35 % reduction in 6.1.4 Heavily cold-worked (HCW) pipe shall be made bythickness of both wall and weld to a welded pipe prior to the final anneal. No filler shall be used in making the weld. Prior to cold working the weld shall be 100 % radiographicallyinspected in accordance with the requirements of ASME Boiler and Pressure Vessel Code Section VIII Division 1 latestrevision Paragraph UW-51.
6.1.5 Welded pipe and HCW pipe of NPS 14 and smallershall have a single longitudinal weld. Welded pipe and HCW pipe of a size larger than NPS 14 shall have a singlelongitudinal weld or shall be produced by forming and weldingpurchaser. All weld tests examinations inspections or treat-ments shall be performed on each weld seam.
6.1.6 At the option of the manufacturer pipe shall be eitherhot finished or cold finished.
6.1.7 The pipe shall be free of scale and contaminatinging is not mandatory when pipe is bright annealed. The exogenous iron particles. Pickling blasting or surface finish-n uaissed e e aba opd s senapplied to the finished pipe.
A312/A312M-22a
6.2 Heat Treatmenr-All pipe shall be furmished in theheat-treated condition in accordance with the requirements ofTable 2. Altematively for seamless pipe immediately follow- ing hot forming while the temperature of the pipes is not lessthan the minimum solution treatment temperature specified in Table 2. pipes shall be individually quenched in water or‘(pqounb yoanp) suea soo q paooo Aipdea
7. Chemical Composition
chemical position prescribed in Table 1. 7.1 The steel shall conform to the requirements as to
8. Product Analysis
8.1 At the request of the purchaser an analysis of one billetor one length of flat-rolled stock from each heat or two pipes from each lot shall be made by the manufacturer. Alot of pipeshall consist of the following number of lengths of the same s o n s e
NPS Designator Lengths of Pipe in Lot2 to 5 6 and over Under 2 400 or fraction thereof 200 or fraction thereof 100 or fraction thereof
8.2 The results of these analyses shall be reported to thepurchaser or the purchaser's representative and shall conform to the requirements specified in Section 7.
not conform to the requirements specified in Section 7 an 8.3 If the analysis of one of the tests specified in 8.1 doesanalysis of each billet or pipe from the same heat or lot may bemade and all billets or pipe conforming to the requirements shall be accepted.
9. Permitted Variations in Wall Thickness
9.1 In addition to the implicit limitation of wall thicknessfor seamless pipe imposed by the limitation on weight in Specification A999/A999M the wall thickness for seamlessand welded pipe at any point shall be within the tolerances specified in Table 3 except that for welded pipe the weld areaand outside diameter for inspection for pliance with this shall not be limited by the “Over" tolerance. The wall thicknessrequirement for pipe ordered by NPS and schedule number isshown in Table X1.1.
10. Tensile Requirements
10.1The tensile properties of the material shall conform tothe requirements prescribed in Table 4.
11. Mechanical Tests Grain Size Determinations and Weld Decay Tests Required
11.1 Mechanical Testing Lor DefinirionThe term lot formechanical tests shall be as follows:
consistent with the requirements of 6.2 in a continuous furnace 11.1.1 Where the final heat treated condition is obtained tests shall apply to all pipes of the same specified outsideheat heat treated in the same fumace at the same temperature diameter and specified wall thickness (or schedule) of the sametime at heat and fumace speed in the same production run orall pipes of the same specified outside diameter and specified
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A312/A312M-22a
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