ASTM B726-02(2021)

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:B726 −02 (Reapproved 2021)
Standard Specification for
Nickel-Chromium-Molybdenum-Cobalt-Tungsten-Iron-Silicon
Alloy (UNS N06333) Welded Tube
This standard is issued under the fixed designation B726; 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 3. General Requirement
3.1 Material furnished under this specification shall con-
1.1 This specification covers alloy UNS N06333 in the form
form to the applicable requirements of Specification B751
of welded tube intended for heat-resisting applications and
unless otherwise provided herein.
general corrosive service.
4. Ordering Information
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4.1 It is the responsibility of the purchaser to specify all
conversions to SI units that are provided for information only
requirements that are necessary for material ordered to this
and are not considered standard.
specification. Examples of such requirements include, but are
not limited to, the following:
1.3 This standard does not purport to address all of the
4.1.1 Alloy or UNS number,
safety concerns, if any, associated with its use. It is the
4.1.2 ASTM designation and date of issue,
responsibility of the user of this standard to become familiar
4.1.3 Dimensions (outside or inside diameter and nominal-
with all hazards including those identified in the appropriate
wall thickness),
Safety Data Sheet (SDS) for this product/material as provided
4.1.4 Length (specific or random),
by the manufacturer, to establish appropriate safety, health,
4.1.5 Quantity (feet or number of pieces),
and environmental practices, and determine the applicability
4.1.6 Certification—State if certification is required,
of regulatory limitations prior to use.
4.1.7 Samples for Product (Check) Analysis—State whether
1.4 This international standard was developed in accor-
samples should be furnished, and
dance with internationally recognized principles on standard-
4.1.8 Purchaser Inspection—If purchaser wishes to witness
ization established in the Decision on Principles for the
tests or inspection of material at place of manufacture, the
Development of International Standards, Guides and Recom-
purchase order must so state indicating which tests or inspec-
mendations issued by the World Trade Organization Technical
tions are to be witnessed.
Barriers to Trade (TBT) Committee.
5. Materials and Manufacture
2. Referenced Documents
5.1 The tube shall be made from flat-rolled alloy conform-
ing to Specification B718, by an automatic welding process
2.1 ASTM Standards:
with no addition of filler metal.
B718 Specification for Nickel-Chromium-Molybdenum-
Cobalt-Tungsten-Iron-SiliconAlloy (UNS N06333) Plate,
5.2 Tube shall be furnished annealed after welding, with
Sheet, and Strip
oxide removed. When the final heat treatment is performed in
B751 Specification for General Requirements for Nickel and
a protective atmosphere, descaling is not necessary.
Nickel Alloy Welded Tube
6. Chemical Composition
6.1 The material shall conform to the requirements as to
chemical composition specified in Table 1.
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6.2 If a product (check) analysis is performed by the
B02.07 on Refined Nickel and Cobalt and Their Alloys.
purchaser, the material shall conform to the product (check)
Current edition approved April 1, 2021. Published April 2021. Originally
approved in 1983. Last previous edition approved in 2016 as B726 – 02 (2016). analysis variations in Specification B751.
DOI: 10.1520/B0726-02R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Mechanical and Other Requirements
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 The mechanical properties of the material at room
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. temperature shall conform to those shown in Tables 2-4.
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