Active Standard ASTM A778 | Developed by Subcommittee: A01.10
Book of Standards Volume: 01.01
Historical (view previous versions of standard)
This specification covers straight seam and spiral butt seam welded unannealed austenitic stainless steel tubular products intended for low and moderate temperatures and corrosive service where treatment is not necessary for corrosion resistance. The tubular products shall be made from flat-rolled steel sheet, coil, or plate by a shielded arc-welding process. The welds shall be made by the manual or automatic electric-welding process. Injurious weld defects shall be repaired by removal to sound metal and rewelding. Transverse tension test and transverse-guided bend test shall be done to the welded joints. Finished products shall have smooth ends free or burrs and shall be free of injurious defects.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers straight seam and spiral butt seam welded unannealed austenitic stainless steel tubular products intended for low and moderate temperatures and corrosive service where heat treatment is not necessary for corrosion resistance. Table 1 lists the five grades covered by this specification. The user of this specification should be aware that a minimum amount of testing and examination is required of the basic product. The user requiring additional testing or examination is referred to the supplemental requirements or Ordering Information, or both. Users requiring a tubular product with post-weld heat treatment or with radiographic examination are referred to Specification A 312/A 312M
1.2 This specification covers welded unannealed tubular products 3 in. (75 mm) through 48 in. (1200 mm) in outside diameter and in nominal wall thicknesses of 0.062 in. (1.5 mm) through 0.500 in. (12.5 mm) produced to this specification. Tubular products having other diameters or wall thickness, or both, may be furnished provided it complies with all other requirements of this specification.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
TABLE 1 Chemical Requirements
|Grade|| UNS DesignationA|| Carbon maxB|| Manga-|
|Composition, %||Titanium||Columbium Plus Tantalus||Nitrogen,|
|TP 304L||S30403|| 0.030||2.00||0.045||0.030||1.00||18.0–20.0|| 8.0–13.0||...||...|| ...||0.10|
|TP 316L||S31603|| 0.030||2.00||0.045||0.030||1.00||16.0–18.0||10.0–14.0||2.00|
|TP 317L||S31703|| 0.030||2.00||0.045||0.030||1.00||18.0–20.0||11.0–15.0||3.0|
|TP 321||S32100|| 0.08 || 2.00||0.045||0.030||1.00||17.0–19.0|| 9.0–12.0||...||C||...||...|
|TP 347||S34700|| 0.08 || 2.00||0.045||0.030||1.00||17.0–19.0|| 9.0–12.0||...||...||D||...|
A New designation established in accordance with Practice E 527
B The carbon analysis shall be reported to the nearest 0.01 %, except for the low carbon (0.030) types, which shall be reported to the nearest 0.001 %.
C The titanium content shall be not less than five times the carbon content and not more than 0.70 %.
D The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.10 %.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A312/A312M Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
A358/A358M Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A409/A409M Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
E340 Test Method for Macroetching Metals and Alloys
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
AWS StandardsA5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes
SAE StandardSAEJ1086 Practice for Numbering Metals and Alloys (UNS) Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
ICS Number Code 23.040.40 (Metal fittings)
UNSPSC Code 31351209(Welded stainless steel tubes)