ASTM B704-23

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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: B704 − 19 B704 − 23
Standard Specification for
Welded Nickel Alloy Tubes
This standard is issued under the fixed designation B704; 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 welded UNS N06219, UNS N06625, UNS N08642, UNS N08825, and UNS N08827 nickel alloy
boiler, heat exchanger, and condenser tubes for general corrosion resisting and low or high-temperature service.
1.2 This specification covers tubes ⁄8 in. to 5 in. (3.18(3.18 mm to 127 mm), inclusive, in outside diameter and 0.0150.015 in. to
0.500 in. (0.38(0.38 mm to 12.70 mm), inclusive, in wall thickness. Specification B751 lists the dimensional requirements of these
sizes. Tubes having other dimensions may be furnished provided such tubing 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.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental
practices, and determine the applicability of regulatory limitations prior to use.
1.5 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:
B751 Specification for General Requirements for Nickel and Nickel Alloy Welded Tube
B899 Terminology Relating to Non-ferrous Metals and Alloys
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification, refer to Terminology B899.
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved Nov. 1, 2019Nov. 1, 2023. Published November 2019November 2023. Originally approved in 1982. Last previous edition approved in 20142019
as B704 – 03 (2014).B704 – 19. DOI: 10.1520/B0704-19.10.1520/B0704-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
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B704 − 23
4. Ordering Information
4.1 Orders for material to this specification should include the following information:
4.1.1 Quantity (feet or number of lengths),
4.1.2 UNS number,
4.1.3 Size (outsize diameter, minimum or average wall thickness),
4.1.4 Length (random or specific),
4.1.5 Class, and
4.1.6 Grade if UNS N06625 is specified. If neither grade of N06625 is specified, grade 1 will be supplied.
4.1.7 ASTM designation.
4.1.8 Product Analysis—State if required.
4.1.9 Purchaser Inspection—State which tests or inspections are to be witnessed, if any.
5. Materials and Manufacture
5.1 Tube shall be made from flat-rolled alloy by an automatic welding process with no addition or filler metal. Subsequent to
welding and prior to final annealing, the material shall be cold-worked in either the weld metal only or both weld and base metal.
5.2 Tube shall be furnished with oxide removed. When bright annealing is used, descaling is not necessary.
6. Chemical Composition
6.1 The material shall conform to the composition limits specified in Table 1. One test is required for each lot as defined in
Specification B751.
6.2 If a product analysis is performed, it shall meet the chemistry limits prescribed in Table 1, subject to the analysis tolerances
of Specification B751.
7. Mechanical and Other Properties
7.1 Mechanical Properties—The material shall conform to the mechanical property requirements specified in Table 2. One test is
required for each lot as defined in Specification B751.
7.2 Flattening Test—A flattening test shall be made on each end of one tube per lot. Superficial ruptures resulting from surface
imperfections shall not be cause for rejection.
7.3 Flange Test—A flange test shall be made on each end of one tube per lot.
7.4 Nondestructive Test Requirements:
7.4.1 Class 1—Each piece in each lot shall be subject to one of the following four tests: hydrostatic, pneumatic (air underwater),
eddy current, or ultrasonic.
7.4.2 Class 2—Each piece in each lot shall be subjected to a leak test and an electric test as follows:
7.4.2.1 Leak Test—Hydrostatic or pneumatic (air underwater).
7.4.2.2 Electric Test—Eddy current or ultrasonic.
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