ASTM B468-10(2020)
(Specification)Standard Specification for Welded UNS N08020 Alloy Tubes
Standard Specification for Welded UNS N08020 Alloy Tubes
ABSTRACT
This specification covers welded UNS N08020, N08024, and N08026 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service. Tubing shall be made from flat-rolled stock by an automatic welding process with no addition of filler metal. Subsequent to welding and prior to final heat treatment, the material shall be cold-worked in either the wed metal only, or in both the weld and base metal. Tubing of UNS N0820 alloy shall be furnished in the stabilized-annealed condition, Tubing of UNS N0824 alloy shall be furnished in the annealed condition. Tubing of UNS N0826 alloy shall be furnished in the solution-annealed condition. The material shall conform to the composition limits specified. The material shall conform to the mechanical property requirements for tensile strength, yield strength and elongation. Flattening and flange tests shall be made on each end of one tube per lot.
SCOPE
1.1 This specification2 covers welded UNS N08020 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service.
1.2 This specification covers tubes 1/8 to 5 in. (3.18 to 127 mm), inclusive, in outside diameter and 0.015 to 0.500 in. (0.38 to 12.70 mm), inclusive, in wall thickness. Table 2 of 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 Safety Data Sheet (SDS) 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.
General Information
- Status
- Published
- Publication Date
- 30-Sep-2020
- Technical Committee
- B02 - Nonferrous Metals and Alloys
- Drafting Committee
- B02.07 - Refined Nickel and Cobalt and Their Alloys
Relations
- Effective Date
- 01-Apr-2019
- Effective Date
- 01-Nov-2018
- Effective Date
- 01-Oct-2016
- Effective Date
- 01-Oct-2015
- Effective Date
- 01-Oct-2014
- Effective Date
- 01-May-2013
- Effective Date
- 01-Feb-2013
- Effective Date
- 01-Feb-2013
- Effective Date
- 01-Apr-2010
- Effective Date
- 01-Oct-2009
- Effective Date
- 01-Oct-2009
- Effective Date
- 01-Nov-2008
- Effective Date
- 01-Mar-2008
- Effective Date
- 01-Dec-2006
- Effective Date
- 01-Nov-2005
Overview
ASTM B468-10(2020) is a globally recognized standard specification established by ASTM International for welded UNS N08020, N08024, and N08026 alloy tubes. These tubes are designed for use in boilers, heat exchangers, and condensers, especially where resistance to corrosion and suitability for low- or high-temperature service are critical. The standard sets forth detailed requirements regarding tube dimensions, materials, manufacturing processes, chemical compositions, mechanical properties, and testing protocols to ensure quality and reliability in demanding industrial environments.
Key Topics
- Material Coverage: Specifies welded tubes manufactured from UNS N08020, N08024, and N08026 alloys, all renowned for their corrosion resistance.
- Dimensional Range: Covers tubes with outside diameters from 1/8 to 5 inches (3.18 to 127 mm) and wall thicknesses from 0.015 to 0.500 inches (0.38 to 12.70 mm), with provisions for other dimensions if specified.
- Manufacturing Process: Tubes are produced from flat-rolled stock by an automatic welding process, without the addition of filler metal. Post-weld, the tubing undergoes cold working either in the weld metal or both the weld and base metal, followed by specified heat treatments.
- Heat Treatment Conditions:
- UNS N08020: Supplied in the stabilized-annealed condition
- UNS N08024: Supplied in the annealed condition
- UNS N08026: Supplied in the solution-annealed condition
- Mechanical Properties: Includes requirements for tensile strength, yield strength, and elongation, ensuring the tube’s integrity under mechanical stress.
- Testing Requirements: Each production lot is subject to flattening and flange tests, as well as either a pressure test or non-destructive electric test, to confirm product quality and compliance.
Applications
ASTM B468 alloy tubes are integral to industries that demand high performance and corrosion resistance under varied temperature conditions, such as:
- Power Generation: Used in boiler tubes for steam generation and heat transfer, where resistance to corrosive environments is essential.
- Chemical Processing: Suitable for heat exchangers and condensers handling aggressive chemicals, due to the alloy’s composition and resistance properties.
- Petrochemical Industry: Applied in processing facilities where both thermal conductivity and resistance to acidic or chlorinated environments are required.
- Desalination Plants: Used in condenser systems where exposure to saline and corrosive environments occurs.
- Other Industrial Applications: Any environment requiring robust welded tubing that meets stringent mechanical and chemical standards.
Related Standards
For organizations and professionals working with welded alloy tubing, the following ASTM standards and practices are directly referenced or related:
- ASTM B751: General Requirements for Nickel and Nickel Alloy Welded Tube - provides additional dimensional and quality criteria.
- ASTM B899: Terminology Relating to Non-ferrous Metals and Alloys - ensures consistent use of industry-standard definitions.
- ASTM A262: Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels - utilized for supplementary intergranular corrosion testing if specified.
Practical Value
Adoption of ASTM B468-10(2020) guarantees consistency in welded UNS N08020, N08024, and N08026 alloy tube manufacturing. This benefits end-users by ensuring reliable performance, safety, and compliance with global trade requirements. Detailed attention to mechanical properties, heat treatment, and testing protocols means products manufactured to this standard are suitable for the most demanding industrial applications where corrosion resistance and mechanical integrity are non-negotiable. Compliance with ASTM B468 is crucial for quality assurance, regulatory approval, and international commerce in the fabrication and deployment of alloy tube systems.
Keywords: ASTM B468, welded alloy tubes, UNS N08020, heat exchanger tubes, condenser tubes, boiler tubes, corrosion-resistant tubing, industrial standards, mechanical properties, alloy tube specification.
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Frequently Asked Questions
ASTM B468-10(2020) is a technical specification published by ASTM International. Its full title is "Standard Specification for Welded UNS N08020 Alloy Tubes". This standard covers: ABSTRACT This specification covers welded UNS N08020, N08024, and N08026 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service. Tubing shall be made from flat-rolled stock by an automatic welding process with no addition of filler metal. Subsequent to welding and prior to final heat treatment, the material shall be cold-worked in either the wed metal only, or in both the weld and base metal. Tubing of UNS N0820 alloy shall be furnished in the stabilized-annealed condition, Tubing of UNS N0824 alloy shall be furnished in the annealed condition. Tubing of UNS N0826 alloy shall be furnished in the solution-annealed condition. The material shall conform to the composition limits specified. The material shall conform to the mechanical property requirements for tensile strength, yield strength and elongation. Flattening and flange tests shall be made on each end of one tube per lot. SCOPE 1.1 This specification2 covers welded UNS N08020 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service. 1.2 This specification covers tubes 1/8 to 5 in. (3.18 to 127 mm), inclusive, in outside diameter and 0.015 to 0.500 in. (0.38 to 12.70 mm), inclusive, in wall thickness. Table 2 of 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 Safety Data Sheet (SDS) 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.
ABSTRACT This specification covers welded UNS N08020, N08024, and N08026 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service. Tubing shall be made from flat-rolled stock by an automatic welding process with no addition of filler metal. Subsequent to welding and prior to final heat treatment, the material shall be cold-worked in either the wed metal only, or in both the weld and base metal. Tubing of UNS N0820 alloy shall be furnished in the stabilized-annealed condition, Tubing of UNS N0824 alloy shall be furnished in the annealed condition. Tubing of UNS N0826 alloy shall be furnished in the solution-annealed condition. The material shall conform to the composition limits specified. The material shall conform to the mechanical property requirements for tensile strength, yield strength and elongation. Flattening and flange tests shall be made on each end of one tube per lot. SCOPE 1.1 This specification2 covers welded UNS N08020 alloy boiler, heat exchanger, and condenser tubes for general corrosion-resisting and low- or high-temperature service. 1.2 This specification covers tubes 1/8 to 5 in. (3.18 to 127 mm), inclusive, in outside diameter and 0.015 to 0.500 in. (0.38 to 12.70 mm), inclusive, in wall thickness. Table 2 of 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 Safety Data Sheet (SDS) 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.
ASTM B468-10(2020) is classified under the following ICS (International Classification for Standards) categories: 77.150.30 - Copper products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM B468-10(2020) has the following relationships with other standards: It is inter standard links to ASTM B751-19, ASTM B751-08(2018), ASTM B899-16, ASTM B899-15, ASTM B899-14, ASTM A262-13, ASTM B899-13, ASTM B751-08(2013), ASTM A262-10, ASTM B899-09, ASTM B899-09e1, ASTM B751-08, ASTM A262-02a(2008), ASTM B899-06, ASTM B899-05. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM B468-10(2020) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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:B468 −10 (Reapproved 2020)
Standard Specification for
Welded UNS N08020 Alloy Tubes
This standard is issued under the fixed designation B468; 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 A262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
1.1 This specification covers welded UNS N08020 alloy
B751 Specification for General Requirements for Nickel and
boiler, heat exchanger, and condenser tubes for general
Nickel Alloy Welded Tube
corrosion-resisting and low- or high-temperature service.
B899 Terminology Relating to Non-ferrous Metals and Al-
1.2 This specification covers tubes ⁄8 to 5 in. (3.18 to 127
loys
mm),inclusive,inoutsidediameterand0.015to0.500in.(0.38
3. Terminology
to 12.70 mm), inclusive, in wall thickness. Table 2 of Specifi-
cation B751 lists the dimensional requirements of these sizes.
3.1 Definitions—Definitions for terms defined in Terminol-
Tubes having other dimensions may be furnished provided
ogy B899 shall apply unless otherwise defined by the require-
such tubing complies with all other requirements of this
ments of this document.
specification.
4. General Requirements
1.3 The values stated in inch-pound units are to be regarded
4.1 Material furnished in accordance with this specification
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only shall conform to the applicable requirements of the current
edition of Specification B751 unless otherwise provided
and are not considered standard.
herein.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Ordering Information
responsibility of the user of this standard to become familiar
5.1 It is the responsibility of the purchaser to specify all
with all hazards including those identified in the appropriate
requirements that are necessary for material ordered under this
Safety Data Sheet (SDS) for this product/material as provided
specification. Examples of such requirements include, but are
by the manufacturer, to establish appropriate safety, health,
not limited to, the following:
and environmental practices, and determine the applicability
5.1.1 Quantity (feet or number of lengths),
of regulatory limitations prior to use.
5.1.2 UNS number,
1.5 This international standard was developed in accor-
5.1.3 Size (outside diameter and minimum or average wall
dance with internationally recognized principles on standard-
thickness),
ization established in the Decision on Principles for the
5.1.4 Length (random or specific),
Development of International Standards, Guides and Recom-
5.1.5 ASTM designation,
mendations issued by the World Trade Organization Technical
5.1.6 Product Analysis—State if required,
Barriers to Trade (TBT) Committee.
5.1.7 Certification—State if a certification or a report of test
2. Referenced Documents results is required,
3 5.1.8 Purchaser Inspection—State which tests or inspec-
2.1 ASTM Standards:
tions are to be witnessed, if any, and
5.1.9 Supplementary requirements, if any.
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6. Materials and Manufacture
B02.07 on Refined Nickel and Cobalt and Their Alloys.
6.1 The tubing shall be made from flat-rolled stock by an
Current edition approved Oct. 1, 2020. Published October 2020. Originally
approved in 1968. Last previous edition approved in 2016 as B468 – 10 (2016).
automatic welding process with no addition of filler metal.
DOI: 10.1520/B0468-10R20.
Subsequent to welding and prior to final heat treatment, the
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
material shall be cold-worked in either the weld metal only, or
cation SB-468 in Section II of that code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or in both the weld and base metal.
contact ASTM Customer
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