ASTM B956-19e1

Standard Specification for Welded Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins

ABSTRACT
This specification establishes the requirements for forge-welded copper and copper alloy with integral fins for use in surface condenser, evaporator, and heat exchanger. The product shall be welded tube of one of the following Copper or Copper Alloy UNS Nos.: C12000, C12200, C19200, C23000, C44300, C44400, C44500, C68700, C70400, C70600, C70620, C71000, C71500, C71520, and C72200. The material heat identification or traceability shall be specified if required. The product shall be manufactured by cold forming to produce an integral enhanced surface for improved heat transfer and shall typically be furnished with unenhanced ends, but may be furnished with enhanced ends or stripped ends. Temper conditions (annealed, WO61 or light cold-worked, WC55) for the tubes and the enhanced and unenhanced sections of the tubes are given. The material shall conform to the chemical composition requirements prescribed for copper, tin, aluminum, nickel, cobalt, lead, iron, zinc, manganese, arsenic, antimony, phosphorus, chromium, and other elements such as carbon, sulfur, silicon, and titanium as determined by chemical analysis. Requirements for grain size, dimensions, mass, and mechanical properties including tensile strength and yield strength as determined by tension test are detailed. The performance requirements including expansion, flattening, and reverse bend tests; mercurous nitrate test or ammonia vapor test; and nondestructive tests such as eddy-current, hydrostatic, and pneumatic tests are detailed as well.
SCOPE
1.1 This specification establishes the requirements for heat exchanger tubes manufactured from forge-welded copper and copper alloy tubing in straight lengths on which the external or internal surface, or both, has been modified by cold forming process to produce an integral enhanced surface for improved heat transfer.  
1.2 The tubes are typically used in surface condensers, evaporators, and heat exchangers.  
1.3 The product shall be produced of the following coppers or copper alloys, as specified in the ordering information.    
Copper or Copper Alloy
UNS No.  
Type of Metal  
C12000A  
DLP Phosphorized, low residual phosphorus  
C12200A  
DHP Phosphorized, high residual phosphorus  
C19200  
Phosphorized, 1 % iron  
C19400  
Copper-Iron Alloy  
C23000  
Red Brass  
C44300  
Admiralty, arsenical  
C44400  
Admiralty, antimonial  
C44500  
Admiralty, phosphorized  
C68700  
Aluminum Brass  
C70400  
95-5 Copper-Nickel  
C70600  
90-10 Copper-Nickel  
C70620  
90-10 Copper-Nickel (Modified for Welding)  
C71000  
80-20 Copper-Nickel  
C71500  
70-30 Copper-Nickel  
C71520  
70-30 Copper-Nickel (Modified for Welding)  
C72200  
Copper-Nickel  
Note 1: Designations listed in Classification B224.  
1.4 Units—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.  
1.5 The following safety hazard caveat pertains only to the test methods described in this specification. 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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determi...

General Information

• Status: Published
• Publication Date: 30-Sep-2019
• ICS: 27.060.30 - Boilers and heat exchangers
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.04 - Pipe and Tube

Relations

• Replaces: ASTM B956-19 - Standard Specification for Welded Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins
• Effective Date: 01-Oct-2019
• Refers: ASTM E8/E8M-24 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Jan-2024
• Refers: ASTM B359/B359M-23 - Standard Specification for Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes With Integral Fins
• Effective Date: 01-Oct-2023
• Refers: ASTM B846-19a - Standard Terminology for Copper and Copper Alloys
• Effective Date: 01-Aug-2019
• Refers: ASTM B846-19 - Standard Terminology for Copper and Copper Alloys
• Effective Date: 01-Jan-2019
• Refers: ASTM B601-18a - Standard Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
• Effective Date: 01-Oct-2018
• Refers: ASTM B543/B543M-18 - Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube
• Effective Date: 01-Oct-2018
• Refers: ASTM E243-18 - Standard Practice for Electromagnetic (Eddy Current) Examination of Copper and Copper-Alloy Tubes
• Effective Date: 01-Jun-2018
• Refers: ASTM B858-06(2018) - Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
• Effective Date: 01-Mar-2018
• Refers: ASTM B601-18 - Standard Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
• Effective Date: 01-Mar-2018
• Refers: ASTM B601-16 - Standard Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
• Effective Date: 01-Oct-2016
• Refers: ASTM E8/E8M-16 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 15-Jul-2016
• Refers: ASTM B359/B359M-15 - Standard Specification for Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes With Integral Fins
• Effective Date: 15-May-2015
• Refers: ASTM B224-15 - Standard Classification of Coppers
• Effective Date: 01-May-2015
• Refers: ASTM E8/E8M-15 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Feb-2015

Overview

ASTM B956-19e1 is the international standard specification established by ASTM for welded copper and copper-alloy condenser and heat exchanger tubes with integral fins. This specification covers the essential requirements for forge-welded copper and copper alloy tubes, which undergo a cold forming process to produce integral enhanced surfaces, typically for improved heat transfer. These enhanced tubes are widely used in applications such as surface condensers, evaporators, and heat exchangers. The standard applies to a range of copper and copper alloy UNS numbers, encompassing various compositions suited for thermal and corrosion-resistant environments.

Key Topics

• Material Types: The standard details specific copper and copper alloy types (such as C12000, C12200, C19200, C23000, C44300, C44400, C44500, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C72200) suitable for fabrication.
• Manufacturing Process: Tubes are produced via forge-welding, with external and/or internal surfaces enhanced through cold forming, resulting in integral fins that boost heat transfer performance.
• Temper Conditions: The specification covers annealed, as-fabricated, and light cold-worked tempers for both enhanced and unenhanced tube sections.
• Chemical Composition: Requirements are set for copper, tin, aluminum, nickel, iron, zinc, and other elements through standard analysis methods.
• Mechanical Properties: Essential criteria such as tensile strength, yield strength, and elongation are specified. Tubes must meet prescribed standards for expansion, flattening, and reverse bend tests.
• Testing Procedures: Non-destructive testing such as eddy-current, hydrostatic, and pneumatic tests ensure tube quality and suitability for service. Performance tests like mercurous nitrate or ammonia vapor tests may be required to verify resistance to stress-corrosion cracking.
• Dimensions and Tolerances: Precision is mandated for tube diameter, wall thickness, length, and squareness to guarantee interchangeability and reliability.
• Quality Assurance: The standard addresses inspection, certification, sampling, retest allowances, packaging, and traceability, facilitating global trade and regulatory compliance.

Applications

Welded copper and copper-alloy tubes with integral fins specified in ASTM B956-19e1 are crucial for:

• Surface Condensers: Efficiently condense steam in power plants and industrial processes, benefiting from enhanced heat transfer provided by integral finned tubes.
• Evaporators: Enable effective thermal exchange in refrigeration and air conditioning systems.
• Heat Exchangers: Serve in chemical processing, marine, HVAC, and power generation sectors, where material durability and superior heat transfer are key.
• Custom Applications: Support specialized uses requiring precise material and performance properties, such as resistance to corrosion or suitability for high-pressure environments.

This standard supports manufacturers, engineers, and specifiers in selecting certified products that meet stringent design and operational requirements.

Related Standards

• ASTM B224: Classification of Coppers
• ASTM B359/B359M: Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes with Integral Fins
• ASTM B543/B543M: Welded Copper and Copper-Alloy Heat Exchanger Tube
• ASTM E8/E8M: Tension Testing of Metallic Materials
• ASTM B153: Expansion (Pin Test) for Copper Tubing
• ASTM B154: Mercurous Nitrate Test for Copper Alloys
• ASTM B858: Ammonia Vapor Test for Susceptibility to Stress Corrosion Cracking
• ASME Boiler and Pressure Vessel Code: In cases where compliance for pressure vessels is required

These standards complement ASTM B956-19e1, supporting the full lifecycle of enhanced, welded copper and copper-alloy tubes for condenser and heat exchanger applications.

Keywords: ASTM B956, welded copper tubes, copper-alloy tubes, heat exchanger tubes, condenser tubes, integral fins, surface condenser, enhanced surface, mechanical properties, non-destructive testing, UNS copper alloys, HVAC, ASME compliance.

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.
´1
Designation:B956 −19
Standard Specification for
Welded Copper and Copper-Alloy Condenser and Heat
Exchanger Tubes with Integral Fins
This standard is issued under the fixed designation B956; 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.
ε NOTE—Footnote 1 was editorially corrected in November 2019.
1. Scope* 1.5 The following safety hazard caveat pertains only to the
test methods described in this specification. This standard does
1.1 This specification establishes the requirements for heat
not purport to address all of the safety concerns, if any,
exchanger tubes manufactured from forge-welded copper and
associated with its use. It is the responsibility of the user of this
copper alloy tubing in straight lengths on which the external or
standard to establish appropriate safety, health, and environ-
internal surface, or both, has been modified by cold forming
mental practices and determine the applicability of regulatory
process to produce an integral enhanced surface for improved
limitations prior to use.
heat transfer.
1.6 Warning—Mercury has been designated by many regu-
1.2 The tubes are typically used in surface condensers,
latory agencies as a hazardous substance that can cause
evaporators, and heat exchangers.
serious medical issues. Mercury, or its vapor, has been
1.3 The product shall be produced of the following coppers demonstrated to be hazardous to health and corrosive to
materials. Use caution when handling mercury and mercury-
or copper alloys, as specified in the ordering information.
containing products. See the applicable product Safety Data
Copper or Copper Alloy
Type of Metal
UNS No. Sheet (SDS) for additional information. The potential exists
that selling mercury or mercury-containing products, or both,
A
C12000 DLP Phosphorized, low residual phosphorus
A is prohibited by local or national law. Users must determine
C12200 DHP Phosphorized, high residual phosphorus
C19200 Phosphorized, 1 % iron
legality of sales in their location.
C19400 Copper-Iron Alloy
1.7 This international standard was developed in accor-
C23000 Red Brass
C44300 Admiralty, arsenical
dance with internationally recognized principles on standard-
C44400 Admiralty, antimonial
ization established in the Decision on Principles for the
C44500 Admiralty, phosphorized
Development of International Standards, Guides and Recom-
C68700 Aluminum Brass
C70400 95-5 Copper-Nickel
mendations issued by the World Trade Organization Technical
C70600 90-10 Copper-Nickel
Barriers to Trade (TBT) Committee.
C70620 90-10 Copper-Nickel (Modified for Welding)
C71000 80-20 Copper-Nickel
2. Referenced Documents
C71500 70-30 Copper-Nickel
C71520 70-30 Copper-Nickel (Modified for Welding)
2.1 ASTM Standards:
C72200 Copper-Nickel
B153 Test Method for Expansion (Pin Test) of Copper and
A
Copper UNS Nos. C12000 and C12200 are classified in Classification B224. Copper-Alloy Pipe and Tubing
B154 Test Method for Mercurous Nitrate Test for Copper
NOTE 1—Designations listed in Classification B224.
Alloys
1.4 Units—The values stated in inch-pound units are to be
B224 Classification of Coppers
regarded as standard. The values given in parentheses are
B359/B359M Specification for Copper and Copper-Alloy
mathematical conversions to SI units that are provided for
Seamless Condenser and Heat Exchanger Tubes With
information only and are not considered standard.
Integral Fins
B543/B543M Specification for Welded Copper and Copper-
Alloy Heat Exchanger Tube
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
and CopperAlloys and is the direct responsibility of Subcommittee B05.04 on Pipe
and Tube.
Current edition approved Oct. 1, 2019. Published October 2019. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ε1
approved in 2007. Last previous edition approved in 2010 as B956/B956M–10 contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
which was withdrawn January 2019 and reinstated in October 2019. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0956–19E01. 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
´1
B956−19
B601 ClassificationforTemperDesignationsforCopperand 3.2.1 enhanced tube—tube having a series of metallic ribs
Copper Alloys—Wrought and Cast on the outside or inside surface, or both, either parallel to the
B846 Terminology for Copper and Copper Alloys longitudinalaxisorcircumferentiallyextendedfromthetubeto
B858 Test Method forAmmoniaVaporTest for Determining increase the effective surface for heat transfer (Figs. 1-3).
Susceptibility to Stress Corrosion Cracking in Copper
3.2.2 unenhanced tube—tube made by processing strip into
Alloys
a tubular shape and forge welding the edges to make a
B968/B968M Test Method for Flattening of Copper and
longitudinal seam with no enhancements on the O.D. or I.D.
Copper-Alloy Pipe and Tube
E8/E8M Test Methods for Tension Testing of Metallic Ma-
4. Types of Welded Tube
terials
4.1 Reference Specification B543/B543M for the types of
E29 Practice for Using Significant Digits in Test Data to
forge welded tube products that will be supplied for the
Determine Conformance with Specifications
enhancing operation (Section 6).
E53 Test Method for Determination of Copper in Unalloyed
Copper by Gravimetry
5. Ordering Information
E54 Test Methods for ChemicalAnalysis of Special Brasses
and Bronzes (Withdrawn 2002)
5.1 Include the following information when placing orders
E62 Test Methods for Chemical Analysis of Copper and for product under this specification as applicable:
CopperAlloys(PhotometricMethods)(Withdrawn2010)
5.1.1 ASTM designation and year of issue;
E112 Test Methods for Determining Average Grain Size 5.1.2 Copper UNS No. designation (for example, Copper
E118 Test Methods for Chemical Analysis of Copper-
UNS No. C12000);
Chromium Alloys (Withdrawn 2010) 5.1.3 Tube type (Section 4);
E243 Practice for Electromagnetic (Eddy Current) Examina-
5.1.4 Temper (Section 8);
tion of Copper and Copper-Alloy Tubes 5.1.5 Dimensions, the diameter, wall thickness, whether
E255 Practice for Sampling Copper and Copper Alloys for
minimum or nominal wall, and length (Section 14);
the Determination of Chemical Composition 5.1.6 Configuration of enhanced surfaces shall be agree
E478 Test Methods for ChemicalAnalysis of CopperAlloys
upon between the manufacturer and the purchaser (Figs. 1-3);
and
2.2 ASME Code:
ASME Boiler and Pressure Vessel Code 5.1.7 Quantity.
5.2 The following options are available but may not be
3. Terminology
included unless specified at the time of placing of the order
3.1 For the definitions of terms related to copper and copper
when required:
alloys, refer to Terminology B846.
5.2.1 Heat identification or traceability details (6.1.2);
5.2.2 Electromagnetic (eddy current) examination;
3.2 Definitions of Terms Specific to This Standard:
5.2.3 Embrittlement test (12.1);
5.2.4 Expansion test (11.1);
5.2.5 Flattening test (11.2);
The last approved version of this historical standard is referenced on
5.2.6 Reverse bend test (11.3);
www.astm.org.
5.2.7 Certification (Section 23);
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
5.2.8 Mill Test Reports;
www.asme.org.
NOTE 1—The outside diameter over the enhanced section will not normally exceed the outside diameter of the unenhanced section.
FIG. 1Outside Diameter Enhanced Tube Nomenclature
´1
B956−19
FIG. 2Outside Diameter and Inside Diameter Enhanced Tube Nomenclature
FIG. 3Inside Diameter Enhanced Tube Nomenclature
5.2.9 If product is purchased for agencies of the U.S. 7. Chemical Composition
Government (see the Supplementary Requirements section of
7.1 The material shall conform to the chemical composi-
{this specification or the general requirements section} for
tionalrequirementsinTable1forCopperUNSNo.designation
additional requirements, if specified); and
specified in the ordering information.
5.2.10 If product is ordered for ASME Boiler and Pressure
Vessel Code Application (see Certification Section 23).
7.2 The composition limits do not preclude the presence of
other elements. By agreement between the manufacturer and
6. Materials and Manufacture
purchaser, limits may be established and analysis required for
unnamed elements.
6.1 Material:
6.1.1 The material of manufacture shall be welded tube of
7.2.1 Copper Alloy C19200 and C19400—Copper may be
one of the CopperAlloy UNS Nos. listed in 1.1 of such purity taken as the difference between the sum of results for all
andsoundnessastobesuitableforprocessingintotheproducts
specified elements and 100 %. When all elements specified,
prescribed herein.
including copper, are determined, their sum shall be 99.8 %
6.1.2 When specified in the contract or purchase order that
minimum.
heat identification or traceability is required, the purchaser
7.2.2 For alloys in which copper is specified as the
shall specify the details desired.
remainder, copper may be taken as the difference between the
6.2 Manufacture: sum of the results for all specified elements and 100 % for the
6.2.1 The product shall be manufacture by cold forming the particular alloy.
enhancement of the heat transfer surfaces.
7.2.2.1 When analyzed, copper plus the sum of results for
specified elements shall conform with the requirements shown
6.3 Product described by this specification shall typically be
in the following table:
furnished with unenhanced ends, but may be furnished with
enhanced ends or stripped ends from which the O.D. enhance- Copper Plus Named
Copper Alloy UNS No. Elements,
ment has been removed by machining.
%min
6.3.1 The enhanced sections of the tube in the as-fabricated
C70400 99.5
temper are in the cold formed condition produced by the C70600 99.5
C70620 99.5
enhancing operation.
C71000 99.5
6.3.2 The unenhanced sections of the tube shall be in the
C71500 99.5
annealed or as-welded temper, and shall be suitable for C71520 99.5
C72200 99.8
rolling-in operations.
´1
B956−19
TABLE 1 Chemical Requirements
Composition, %
Copper or
Copper
Nickel, Other
Lead,
Alloy
Copper Tin Aluminum incl Iron Zinc Manganese Arsenic Antimony Phosphorus Chromium Named
max
UNS No.
Cobalt Elements
A
C12000 99.90 min . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.004–0.012 . . . . . .
A
C12200 99.9 min . . . . . . . . . . . . . . . . . . . . . . . . 0.015–0.040 . . .
B
C19200 98.5 min . . . . . . . . . . . . 0.8–1.2 0.20 max . . . . . . . . . 0.01–0.04 . . . . . .
B
C19400 97.0 min 0.03 2.1–2.6 0.05–0.20 0.015–0.15
B
C23000 84.0–86.0 . . . . . . . . . 0.05 0.05 max remainder . . . . . . . . . . . . . . . . . .
C
C44300 70.0–73.0 0.9–1.2 . . . . . . 0.07 0.06 max remainder . . . 0.02–0.06 . . . . . . . . . . . .
C
C44400 70.0–73.0 0.9–1.2 . . . . . . 0.07 0.06 max remainder . . . . . . 0.02–0.10 . . . . . . . . .
C
C44500 70.0–73.0 0.9–1.2 . . . . . . 0.07 0.06 max remainder . . . . . . . . . 0.02–0.10 . . . . . .
C68700 76.0– . . . 1.8–2.5 . . . 0.07 0.06 max remainder . . . 0.02–0.06 . . . . . . . . . . . .
A,D
79.0
C70400 remain- . . . . . . 4.8–6.2 0.05 1.3–1.7 1.0 max 0.30–0.8 . . . . . . . . . . . . . . .
A,D
der
C70600 remain- . . . . . . 9.0–11.0 0.05 1.0–1.8 1.0 max 1.0 max . . . . . . . . . . . . . . .
A,D
der
A,D
C70620 86.5 min . . . . . . 9.0–11.0 0.02 1.0–1.8 0.50 max 1.0 max . . . . . . 0.02 max . . . 0.05 C max
0.02 S max
C71000 remain- . . . . . . 19.0–23.0 0.05 1.0 max 1.0 max 1.0 max . . . . . . . . . . . .
A,D,E
der
C71500 remain- . . . . . . 29.0–33.0 0.05 0.40–1.0 1.0 max 1.0 max . . . . . . . . . . . . . . .
A,D
der
A,D
C71520 65.0 min . . . . . . 29.0–33.0 0.02 0.40–1.0 0.50 max 1.0 max . . . . . . 0.02 max . . . 0.05 C max
0.02 S max
C72200 remain- . . . . . . 15.0–18.0 0.05 0.50–1.0 1.0 max 1.0 max . . . . . . . . . 0.30–0.7 0.03 Si max
A,B,E
der 0.03 Ti max
A
Copper (including silver).
B
Cu + Sum of Named Elements, 99.8 % min.
C
Cu + Sum of Named Elements, 99.6 % min.
D
Cu + Sum of Named Elements, 99.5 % min.
E
When the product is for subsequent welding applications, and so specified in the contract or purchase order, zinc shall be 0.50 % max, lead 0.02 % max, phosphorus
0.02 % max, sulfur 0.02 % max, and carbon 0.05 % max.
7.2.3 For alloys in which zinc is specified as the remainder, 8.3 Tubes of Copper Alloy UNS Nos. C12200, C19200,
either copper or zinc may be taken as the difference between C19400, C70400, C70600, C71000, C71500, and C72200 are
the sum of the results of specified elements analyzed and normally supplied in the temper specified in the purchase order
100 %. without stress relief treatment.
7.2.3.1 Whenallspecifiedelementsaredetermined,thesum NOTE 2—Some tubes, when subjected to aggressive environments, may
be subject to stress-corrosion cracking because of the residual tensile
of results plus copper shall be as follows:
stresses developed in the enhancing process. For such applications, it is
Copper Plus Named
suggested that tubes of Copper Alloy UNS Nos. C23000, C44300,
Copper Alloy UNS No. Elements,
C44400, C44500, and C68700 are subjected to a stress-relieving thermal
%min
treatment subsequent to the enhancement process. In Specification B359/
C23000 99.8
B359M, the stress relief anneal is mandatory for brass alloys.
C44300, C44400, C44500 99.6
C68700 99.5
9. Grain Size for Annealed Tempers
8. Temper
9.1 Samples of annealed temper tubes shall be examined at
8.1 Tempers, as defined in Classification B601 and this
a magnification of 75 diameters. The grain size shall be
specification, are as follows:
determined in the wall beneath the internal enhancement.
8.1.1 The tube, after enhancing, shall be supplied, as
While there is not grain size range, the microstructure shall
specified, in the annealed (061) or as-fabricated temper.
show complete recrystallization and the weld zone shall have a
8.1.1.1 The enhanced sections of tubes in the as-fabricated
structure typical of hot-forged welds.
temper are in the cold formed condition produced by the
fabricating operation.
10. Mechanical Property Requirements
8.1.1.2 The unenhanced sections of tubes in the as-
fabricated temper are in the temper of the tube prior to
10.1 Tensile Strength and Yield Strength Requirements:
enhancing, welded and annealed (WO61), welded and light
10.1.1 Product furnished under this specification shall con-
cold-worked (WC55), and suitable for rolling-in operations.
form to the tensile and yield strength requirements prescribed
in Table 2 when tested in accordance with Test Methods
8.2 Tubes of Copper Alloy UNS Nos. C23000, C44300,
E8/E8M.
C44400, C44500, and C68700 shall be furnished in the
annealed temper or the stress relieved condition as specified in 10.1.2 Acceptance or rejection based upon mechanical
the purchase order unless otherwise agreed upon between the properties shall depend only on tensile strength and yield
purchaser and the manufacturer. strength.
´1
B956−19
TABLE 2 Tensile Requirements
B
Copper or Tensile Strength
Temper Designation Yield Strength
Copper Alloy min min
A
A
Standard Former ksi (MPa)
UNS No. ksi (MPa)
C
C12000, C12200, WO61 annealed 30 (205) 9 (62)
C19200 WO61 annealed 38 (260) 12 (85)
C19400 WO61 annealed 45 (310) 15 (105)
WC55 light cold-worked 45 (310) 22 (152)
C23000 WO61 annealed 40 (275) 12 (85)
C23000 WC55 light cold-worked 42 (290) 20 (138)
C44300, C44400, C44500 WO61 annealed 45 (310) 15 (105)
C44300, C44400, C44500 WC55 light cold-worked 50 (345) 35 (241)
C68700 WO61 annealed 50 (345) 18 (125)
D D
C68700 WC55 light cold-worked
C70400 WO61 annealed 38 (260) 12 (85)
C70400 WC55 light cold-worked 40 (275) 30 (207)
C70600 WO61 annealed 40 (275) 15 (105)
C70600 WC55 light cold-worked 45 (310) 35 (241)
C70620 WO61 annealed 40 (275) 15 (105)
C70620 WC55 light cold-worked
C71000 WO61 annealed 45 (310) 16 (110)
C71000 WC55 light cold-worked 50 (345) 35 (241)
C71500 WO61 annealed 52 (360) 18 (125)
C71500 WC55 light cold-worked 54 (372) 35 (241)
C71520 WO61 annealed 52 (360) 18 (125)
C71520 WC55 light cold-worked
C72200 WO61 annealed 45 (310) 16 (110)
C72200 WC55 light cold-worked 50 (345) 30 (207)
A
ksi = 1000 psi.
B
At 0.5 % extension under load.
C
Light straightening operation is permitted.
D
Where no properties are shown, strength requirements shall be as agreed upon between the purchaser and the manufacturer.
11. Performance Requirements 11.1.2 The expanded tube area shall be free of defects, but
blemishes of nature that do not interfere with the intended
11.1 Expansion Test Requirements:
application are acceptable.
11.1.1 When specified in the contract or purchase order,
product in the annealed tempers and the light cold-worked 11.2 Flattening Test:
temper shall withstand expansion in accordance with Test
11.2.1 When specified in the contract or purchase order, the
Method B153 and to the extent in Table 3.
flattening test in accordance with Test Method B968/B968M
shall be performed.
11.2.1.1 During inspection, the flattened areas of the test
specimenshallbefreeofdefects,butblemishesofanaturethat
TABLE 3 Expansion Requirements
do not interfere with the intended application are acceptable.
Expansion of Tube
Copper or
Outside Diameter,
11.3 Reverse Bend Test:
Temper Copper Alloy
in Percent of Original
UNS No.
11.3.1 When specified in the contract or purchase order, the
Outside Diameter
reverse bend test described in the test method section in 19.2.7
Annealed C12000 30
C12200 30
shall be performed on unenhanced tubes.
C19200 20
11.3.2 The sample shall be free of defects, but blemishes of
C19400 20
nature that do not interfere with the intended application are
C23000 20
C44300, C44400, 20
acceptable.
C44500
C68700 20
C70400 30 12. Other Requirements
C70600, 70620 30
12.1 Mercurous Nitrate Test or Ammonia Vapor Test:
C71000 30
C71500, C71520 30
12.1.1 When specified in the contract or purchase order,
C72200 30
product in drawn tempers shall be tested for residual stress in
Light cold-worked C12200 20 accordance with the requirements ofTest Method B154 orTest
C19400 20
Method B858, and show no signs of cracking only for Copper
C70400 20
Alloys Nos. C23000, C44300, C44400, C44500, C60800, and
C70600 20
C71000 20 C68700. (Warning—Mercury is a definite health hazard. With
C71500 20
the Mercurous Nitrate Test, equipment for the detection and
C71640 20
removal of mercury vapor produced in volatilization, and the
C72200 20
use of protective gloves is recommended.)
´1
B956−19
12.1.2 Thetestspecimens,cut6in.(150mm)inlengthfrom 13.3.1 The tube need not be tested at a hydrostatic pressure
the enhanced section shall withstand, without cracking, an over 1000 psi (6.9 MPa) unless so specified.
immersion in the standard mercurous nitrate solution in Test
13.4 Pneumatic Test—(If required on the purchase order),
Method B154 or immersion in the ammonia vapor solution as
each tube, after enhancing, shall withstand a minimum internal
defined in Test Method B858.
air pressure of 250 psig (1.7 MPa) for 5 s and any evidence of
12.1.3 Unless otherwise agreed upon between the
leakage shall be cause for rejection.The test method used shall
manufacturer, or supplier, and the purchaser, the manufacturer
permit easy visual detection of any leakage, such as having the
shall have the option of using either the mercurous nitrate test
tube under water, or by the pressure differential method.
or the ammonia vapor test. If agreement cannot be reached, the
13.5 ASME Pressure Vessel Code:
mercurous nitrate test standard shall be utilized.
13.5.1 When tubes are specified to meet the requirements of
12.1.4 If the ammonia vapor test, Test Method B858
...