ASTM A778/A778M-24

Standard Specification for Welded, Unannealed Austenitic Stainless Steel Tubular Products

ABSTRACT
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.
SCOPE
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 A312/A312M, A358/A358M, or A409/A409M, as applicable.    
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. [1.57 mm] through 0.500 in. [12.70 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 either inch-pound units or SI units are to be regarded separately as standard. Within the text, 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 the values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.  
1.4 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.

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 23.040.40 - Metal fittings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.10 - Stainless and Alloy Steel Tubular Products

Relations

• Replaces: ASTM A778/A778M-22 - Standard Specification for Welded, Unannealed Austenitic Stainless Steel Tubular Products
• Effective Date: 01-Mar-2024
• Refers: ASTM A358/A358M-24 - Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
• Effective Date: 01-Mar-2024
• Refers: ASTM A409/A409M-24 - Standard Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
• Effective Date: 01-Mar-2024
• Refers: ASTM A358/A358M-19 - Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
• Effective Date: 01-Nov-2019
• Refers: ASTM A409/A409M-19 - Standard Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
• Effective Date: 01-Nov-2019
• Referred By: ASTM A999/A999M-23 - Standard Specification for General Requirements for Alloy and Stainless Steel Pipe
• Effective Date: 01-Mar-2024

Overview

ASTM A778/A778M-24 is the standard specification developed by ASTM International that covers welded, unannealed austenitic stainless steel tubular products. These tubular components are engineered specifically for use in low and moderate temperature and corrosive service environments where additional post-weld heat treatment is not needed for corrosion resistance. The standard applies to both straight seam and spiral butt seam welded tubes that are produced using shielded arc-welding or laser welding processes from flat-rolled steel material such as sheet, coil, or plate.

Key Topics

• Material and Grades: The specification includes five primary grades of austenitic stainless steel, suitable for varying corrosion and mechanical requirements. The grades are defined by their chemical composition and mechanical properties.
• Dimensions and Sizing: Covers welded tubular products from 3 in. [75 mm] to 48 in. [1200 mm] outside diameter, and wall thickness from 0.062 in. [1.57 mm] to 0.500 in. [12.70 mm]. Other dimensions may be supplied if all requirements are met.
• Welding Processes: Welds are made by manual or automatic welding. The standard includes requirements for weld quality, permissible defects, and repair procedures.
• Testing and Inspection: Minimum mechanical testing includes transverse tension and transverse-guided bend tests on welded joints. Supplemental requirements provide further tests, including etching, flattening, and hydrostatic testing.
• Workmanship and Finish: Finished tubes must have smooth, burr-free ends and be free from injurious defects. Surface imperfections that can be removed within wall thickness tolerances are not considered serious.
• Certification and Marking: Each product must be properly marked with manufacturer's information, material grade, specification number, and an indication that it has not been heat treated (HT-O).

Applications

ASTM A778/A778M-24 pipes and tubes are widely used in industries requiring corrosion-resistant stainless steel tubing without the need for heat treatment after welding. Key application sectors include:

• Chemical processing plants where resistance to corrosive chemicals at moderate temperatures is necessary
• Food and beverage processing, leveraging hygienic, corrosion-resistant tube surfaces
• Water treatment and distribution systems, particularly where cleanliness and corrosion resistance are critical
• Architectural and structural applications, where aesthetic finish and long-term durability are important
• General industrial uses where low to moderate temperature and corrosive environments prevail

When post-weld heat treatment or radiographic examination is needed, users should consider related standards such as ASTM A312/A312M, A358/A358M, or A409/A409M.

Related Standards

For comprehensive engineering and procurement, ASTM A778/A778M-24 references and aligns with several other key standards:

• ASTM A240/A240M: Specification for chromium and chromium-nickel stainless steel plate, sheet, and strip
• ASTM A312/A312M: Specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes
• ASTM A358/A358M: Specification for electric-fusion-welded austenitic chromium-nickel stainless steel pipe
• ASTM A409/A409M: Specification for welded large diameter austenitic steel pipe for corrosive or high-temperature service
• ASTM A999/A999M: General requirements for alloy and stainless steel pipe, including testing and dimensional tolerances
• AWS A5.4/A5.9: Welding standards for corrosion-resisting chromium and chromium-nickel electrodes and rods

Practical Value

By following ASTM A778/A778M-24, manufacturers, engineers, and procurement specialists can ensure:

• Reliable performance in sensitive or corrosive service environments
• Consistent product quality due to standardized manufacturing, inspection, and testing requirements
• Compatibility with international supply chains and other ASTM/ISO-compliant systems

The standard is essential for industries needing cost-effective, high-quality welded stainless steel tubing without additional heat treatment, enabling efficient and dependable system construction and operation.

Standards Content (Sample)

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: A778/A778M − 24
Standard Specification for
Welded, Unannealed Austenitic Stainless Steel Tubular
Products
This standard is issued under the fixed designation A778/A778M; 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 straight seam and spiral butt 2.1 ASTM Standards:
seam welded unannealed austenitic stainless steel tubular A240/A240M Specification for Chromium and Chromium-
products intended for low and moderate temperatures and Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
corrosive service where heat treatment is not necessary for Vessels and for General Applications
corrosion resistance. Table 1 lists the five grades covered by A262 Practices for Detecting Susceptibility to Intergranular
this specification. The user of this specification should be Attack in Austenitic Stainless Steels
aware that a minimum amount of testing and examination is A312/A312M Specification for Seamless, Welded, and
required of the basic product. The user requiring additional Heavily Cold Worked Austenitic Stainless Steel Pipes
testing or examination is referred to the supplemental require- A358/A358M Specification for Electric-Fusion-Welded
ments or Ordering Information, or both. Users requiring a Austenitic Chromium-Nickel Stainless Steel Pipe for
tubular product with post-weld heat treatment or with radio- High-Temperature Service and General Applications
graphic examination are referred to Specification A312/ A370 Test Methods and Definitions for Mechanical Testing
A312M, A358/A358M, or A409/A409M, as applicable. of Steel Products
A409/A409M Specification for Welded Large Diameter
1.2 This specification covers welded unannealed tubular
Austenitic Steel Pipe for Corrosive or High-Temperature
products 3 in. [75 mm] through 48 in. [1200 mm] in outside
Service
diameter and in nominal wall thicknesses of 0.062 in. [1.57
A700 Guide for Packaging, Marking, and Loading Methods
mm] through 0.500 in. [12.70 mm] produced to this specifica-
for Steel Products for Shipment
tion. Tubular products having other diameters or wall
A941 Terminology Relating to Steel, Stainless Steel, Related
thickness, or both, may be furnished provided it complies with
Alloys, and Ferroalloys
all other requirements of this specification.
A999/A999M Specification for General Requirements for
1.3 The values stated in either inch-pound units or SI units
Alloy and Stainless Steel Pipe
are to be regarded separately as standard. Within the text, SI
E340 Practice for Macroetching Metals and Alloys
units are shown in brackets. The values stated in each system
E527 Practice for Numbering Metals and Alloys in the
may not be exact equivalents; therefore, each system shall be
Unified Numbering System (UNS)
used independently of the other. Combining the values from
2.2 AWS Standards:
the two systems may result in non-conformance with the
A5.4 Corrosion—Resisting Chromium and Chromium-
standard. The inch-pound units shall apply unless the “M”
Nickel Steel Covered Welding Electrodes
designation of this specification is specified in the order.
A5.9 Corrosion–Resisting Chromium and Chromium-Nickel
1.4 This international standard was developed in accor-
Steel Welding Rods and Bare Electrodes
dance with internationally recognized principles on standard-
2.3 SAE Standard:
ization established in the Decision on Principles for the
SAE J1086 Practice for Numbering Metals and Alloys
Development of International Standards, Guides and Recom- 4
(UNS)
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Standards volume information, refer to the standard’s Document Summary page on
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee the ASTM website.
A01.10 on Stainless and Alloy Steel Tubular Products. Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
Current edition approved March 1, 2024. Published April 2024. Originally Miami, FL 33126, http://www.aws.org.
approved in 1980. Last previous edition approved in 2022 as A778/A778M – 22. Available from Society of Automotive Engineers (SAE), 400 Commonwealth
DOI: 10.1520/A0778_A0778M-24. Dr., Warrendale, PA 15096-0001, http://www.sae.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
A778/A778M − 24
TABLE 1 Chemical Requirements
Composition, %
Manga- Phos- Columbium
UNS Carbon Nitrogen,
Grade nese, phorus, Titanium Plus
A B Sulfur, Silicon,
Designation max max
Chromium Nickel Molybdenum
max max Tantalum
max max
TP 304L S30403 0.030 2.00 0.045 0.030 1.00 18.0–20.0 8.0–13.0 . . . 0.10
C
... S30416 0.030 2.00 0.045 0.015 0.80–2.00 17.5–19.5 9.0–11.0 0.40–0.80 ... ... 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 . . 0.10
3.00
TP 317L S31703 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0 . . 0.10
4.0
D
TP 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
E
TP 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
A
New designation established in accordance with Practice E527 and SAE J1086.
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
S30416 has a range of composition for Silicon instead of a max.
D
The titanium content shall be not less than five times the carbon content and not more than 0.70 %.
E
The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.10 %.
3. Terminology 6.2 Tubular products 14 in. [350 mm] in diameter and
smaller shall have a single longitudinal weld or a spiral butt
3.1 Definitions:
weld seam. Tubular products of larger diameter may have a
3.2 The definitions in Specification A999/A999M and Ter-
maximum of three longitudinal welds. All weld tests,
minology A941 are applicable to this specification.
examinations, inspections, or treatments are to be performed on
each weld seam.
4. Ordering Information
6.3 Circumferentially welded joints of the same quality as
4.1 Orders for material to this specification should include
the longitudinal or spiral joints shall be permitted by agreement
the following:
between the manufacturer and the purchaser.
4.1.1 Quantity (feet, metres, or number of pieces),
4.1.2 Name of material (welded unannealed austenitic stain-
6.4 All tubular products shall be furnished clean and free of
less steel tubular products),
scale.
4.1.3 Straight seam or spiral butt seam,
6.5 Welding:
4.1.4 Grade (see Table 1),
4.1.5 Size (outside diameter and specified wall thickness)
6.5.1 The welds shall be made by the manual or automatic
(see 10.3 and 10.4),
welding process.
4.1.6 Length (mill standard lengths, or specify cut lengths)
6.5.2 The welded joints may show a reinforcing bead no
(see 10.1),
greater than ⁄16 in. [1.57 mm] on either surface of the tubular
4.1.7 Optional requirements (Supplementary Requirements
product. At no place shall the thickness of the weld section be
S1 to S5),
less than the minimum wall thickness permitted by the toler-
4.1.8 Certification requirements,
ances of 10.4. The weld bead may be removed at the option of
4.1.9 Specification designation, and
the manufacturer or upon agreement between the manufacturer
4.1.10 Special requirements.
and purchaser.
6.5.3 Injurious weld defects shall be repaired by removal to
5. Significance and Use
sound metal and rewelding.
5.1 It is anticipated that the ASTM Subcommittees A01.06,
6.5.4 The alloy content (chromium, nickel, molybdenum,
A01.10, A01.17, A01.22, and A01.28 will use the standard
columbium, and carbon) of the filler metal shall conform to
composition limits listed in this specification for the grades
that required for the plate or the welding electrodes as shown
identified by the corresponding UNS designation in the product
in Table II of Specification AWS A5.4 or in Table I of
specification unless there is a specific technical justification for
Specification AWS A5.9, except that when welding on Type
doing otherwise. The compositions in this specification shall
321 base metal, the deposited weld metal may correspond to
not be considered as chemical requirements for any particular
Type 347.
product until adopted by the subcommittee overseeing that
product.
7. Mechanical Test Requirements
6. Manufacture
7.1 Each lot shall be subjected to one transverse tension test
6.1 The tubular products shall be welded from flat-rolled
and two transverse guided bend tests.
steel sheet, coil, or plate by a shielded arc-welding or laser
NOTE 1—The term lot applies to all pipe of the same grade, of the same
welding process. The material used for manufacture shall
thickness, produced from the same heat with the same weld procedure.
conform to the requirements of one of the grades of Specifi-
cation A240/A240M listed in Table 1. At the manufacturer’s 7.2 The maximum lot size shall be in accordance with the
option, filler metal may be used. following table:
A778/A778M − 24
10. Permissible Variations in Tubular Products
Diameter Range Lot Size (lengths
...

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: A778/A778M − 22 A778/A778M − 24
Standard Specification for
Welded, Unannealed Austenitic Stainless Steel Tubular
Products
This standard is issued under the fixed designation A778/A778M; 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 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 A312/A312M, A358/A358M, or A409/A409M, as applicable.
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. [1.57 mm] through 0.500 in. [12.70 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 either inch-pound units or SI units are to be regarded separately as standard. Within the text, 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 the values from the two systems may result in non-conformance with the standard. The
inch-pound units shall apply unless the “M” designation of this specification is specified in the order.
1.4 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 ASTM Standards:
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
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.10
on Stainless and Alloy Steel Tubular Products.
Current edition approved Sept. 1, 2022March 1, 2024. Published September 2022April 2024. Originally approved in 1980. Last previous edition approved in 20212022
as A778/A778M – 16 (2021).A778/A778M – 22. DOI: 10.1520/A0778_A0778M-22.10.1520/A0778_A0778M-24.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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
A778/A778M − 24
TABLE 1 Chemical Requirements
Composition, %
Manga- Phos- Columbium
UNS Carbon Nitrogen,
Grade nese, phorus, Titanium Plus
A B Sulfur, Silicon,
Designation max max
Chromium Nickel Molybdenum
max max Tantalum
max max
TP 304L S30403 0.030 2.00 0.045 0.030 1.00 18.0–20.0 8.0–13.0 . . . 0.10
C
... S30416 0.030 2.00 0.045 0.015 0.80–2.00 17.5–19.5 9.0–11.0 0.40–0.80 ... ... 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 . . 0.10
3.00
TP 317L S31703 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0 . . 0.10
4.0
C
TP 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
D
TP 321 S32100 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
D
TP 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
E
TP 347 S34700 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . .
A
New designation established in accordance with Practice E527 and SAE J1086.
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
S30416 has a range of composition for Silicon instead of a max.
D
The titanium content shall be not less than five times the carbon content and not more than 0.70 %.
E
The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.10 %.
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 Guide 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 Practice for Macroetching Metals and Alloys
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.2 AWS Standards:
A5.4 Corrosion—Resisting Chromium and Chromium-Nickel Steel Covered Welding Electrodes
A5.9 Corrosion–Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes
2.3 SAE Standard:
SAE J1086 Practice for Numbering Metals and Alloys (UNS)
3. Terminology
3.1 Definitions:
3.2 The definitions in Specification A999/A999M and Terminology A941 are applicable to this specification.
4. Ordering Information
4.1 Orders for material to this specification should include the following:
4.1.1 Quantity (feet, metres, or number of pieces),
4.1.2 Name of material (welded unannealed austenitic stainless steel tubular products),
4.1.3 Straight seam or spiral butt seam,
4.1.4 Grade (see Table 1),
4.1.5 Size (outside diameter and specified wall thickness) (see 10.3 and 10.4),
4.1.6 Length (mill standard lengths, or specify cut lengths) (see 10.1),
4.1.7 Optional requirements (Supplementary Requirements S1 to S5),
Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http://www.aws.org.
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
A778/A778M − 24
4.1.8 Certification requirements,
4.1.9 Specification designation, and
4.1.10 Special requirements.
5. Significance and Use
5.1 It is anticipated that the ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 will use the standard
composition limits listed in this specification for the grades identified by the corresponding UNS designation in the product
specification unless there is a specific technical justification for doing otherwise. The compositions in this specification shall not
be considered as chemical requirements for any particular product until adopted by the subcommittee overseeing that product.
6. Manufacture
6.1 The tubular products shall be welded from flat-rolled steel sheet, coil, or plate by a shielded arc-welding or laser welding
process. The material used for manufacture shall conform to the requirements of one of the grades of Specification A240/A240M
listed in Table 1. At the manufacturer’s option, filler metal may be used.
6.2 Tubular products 14 in. [350 mm] in diameter and smaller shall have a single longitudinal weld or a spiral butt weld seam.
Tubular products of larger diameter may have a maximum of three longitudinal welds. All weld tests, examinations, inspections,
or treatments are to be performed on each weld seam.
6.3 Circumferentially welded joints of the same quality as the longitudinal or spiral joints shall be permitted by agreement between
the manufacturer and the purchaser.
6.4 All tubular products shall be furnished clean and free of scale.
6.5 Welding:
6.5.1 The welds shall be made by the manual or automatic welding process.
6.5.2 The welded joints may show a reinforcing bead no greater than ⁄16 in. [1.57 mm] on either surface of the tubular product.
At no place shall the thickness of the weld section be less than the minimum wall thickness permitted by the tolerances of 10.4.
The weld bead may be removed at the option of the manufacturer or upon agreement between the manufacturer and purchaser.
6.5.3 Injurious weld defects shall be repaired by removal to sound metal and rewelding.
6.5.4 The alloy content (chromium, nickel, molybdenum, columbium, and carbon) of the filler metal shall conform to that required
for the plate or the welding electrodes as shown in Table II of Specification AWS A5.4 or in Table I of Specification AWS A5.9,
except that when welding on Type 321 base metal, the deposited weld metal may correspond to Type 347.
7. Mechanical Test Requirements
7.1 Each lot shall be subjected to one transverse tension test and two transverse guided bend tests.
NOTE 1—The term lot applies to all pipe of the same grade, of the same thickness, produced from the same heat with the same weld procedure.
7.2 The maximum lot size shall be in accordance with the following table:
Diameter Range Lot Size (leng
...