ASTMB432-14StandardSpecificationforCopperandCopper

Standard Specification for

Copper and Copper Alloy Clad Steel Plate1

This standard is issued under thefixed designation B432;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*

1.1This specification establishes the requirements for plate of a carbon steel or low-alloy steel base to which is integrally and continuously bonded on one or both sides a layer of copper or copper-base alloy.The material is generally intended for pressure vessel use but may be used in other structural applications where corrosion resistance or conductivity of the alloy is of prime importance.

1.2Units—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.

2.Referenced Documents

2.1ASTM Standards:2

A6/A6M Specification for General Requirements for Rolled Structural Steel Bars,Plates,Shapes,and Sheet Piling

A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels

A578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applica-tions

B96/B96M Specification for Copper-Silicon Alloy Plate, Sheet,Strip,and Rolled Bar for General Purposes and Pressure Vessels

B152/B152M Specification for Copper Sheet,Strip,Plate, and Rolled Bar

B171/B171M Specification for Copper-Alloy Plate and Sheet for Pressure Vessels,Condensers,and Heat Ex-changers

B846Terminology for Copper and Copper Alloys

E29Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

2.2ASME Code:3

Boiler and Pressure Vessel Code,Section VIII

Boiler and Pressure Vessel Code,Section IX

3.Terminology

3.1For definitions of terms related to copper and copper alloys,refer to Terminology B846.

3.2Definitions of Terms Specific to This Standard:

3.2.1base metal(backing steel),n—component to which the cladding metal is applied,usually the greater percentage of the composite plate and usually consisting of carbon or low-alloy steel.

3.2.2blindflange,n—same as a cover.

3.2.3bonding,n—adhesion of one surface to another with-out the use of an adhesive as a bonding agent.

3.2.4cladding metal,n—the copper or copper-base alloy component of the composite plate.

3.2.5cover,n—a component with similar features to a tubesheet which is used as a closure and which typically requires surface machining over part of the face while main-taining minimum specified minimum thickness.

3.2.6double-clad,n—material is considered as double-clad when both sides of the steel base metal are covered with copper cladding.

3.2.7interface,n—of the clad product,is that region of the thickness in which the product transitions from essentially 100%base metal to100%cladding metal,also referred to as the bond or bondzone.

3.2.8integrally and continuously bonded,adv—a condition in which the cladding metal and base metal are brought together to form a metallurgical bond at essentially the entire interface of the two metals by means other than those processes that do not produce a homogeneous composite plate.

3.2.9plate,n—the term plate as used in this specification applies to material0.188in.(

4.78mm)and over in thickness, and over10in.(254mm)in width.

1This specification is under the jurisdiction of ASTM Committee B05on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.01on Plate, Sheet,and Strip.

Current edition approved Sept.1,2014.Published November2014.Originally approved in1966.Last previous edition approved in2009as B432–09a.DOI: 10.1520/B0432-14.

2For 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.

3Available from American Society of Mechanical Engineers(ASME),ASME International Headquarters,Two Park Ave.,New York,NY10016-5990,http:// www.asme.org.

*A Summary of Changes section appears at the end of this standard Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959.United States3.2.10single-clad,n—material is considered as single-clad when only one side of the steel base metal is covered with copper cladding.

3.2.11tubesheet,n—the term tubesheet as used in this specification applies to a clad plate,which is used in a heat exchanger to separate the tubeside and shell side components. Typically,but not necessarily,tubesheets are round,relatively thick,and require that the cladding and/or base be machined flat over part or all of the face while maintaining specified minimum thicknesses.

4.Ordering Information

4.1Include the following specified choices when placing orders for product under this specification,as applicable:

4.1.1ASTM designation and year of issue,

4.1.2Dimensions,including the thickness of the cladding alloy and the backing steel,or of the total composite plate,and if more or less restrictive thickness tolerances apply,

4.1.3Quantity—total weight or number of pieces of each size.

4.1.4Cladding metal specification(see Section6),

4.1.5Base metal specification(see Section6),

4.1.6Advise if the part is to be used as a tubesheet,cover, or blindflange,

4.1.7Restrictions,if required,on repair by welding(see Section11).

4.2The following options are available but may not be included unless specified at the time of placing of the order when required:

4.2.1Shear testing requirements if any(see Sections7and 8).

4.2.2Certification,

4.2.3Test Report,

4.2.4Options presented in the Supplementary Requirements Section of this specification,

4.2.5Additions to the specification or special requirements, 4.2.6The purchaser is referred to the listed supplementary requirements in this specification and to the detailed require-ments in Specifications A20/A20M or A6/A6M as applicable. If the requirements of this specification are in conflict with the requirements of Specifications A20/A20M or A6/A6M,the requirements of this specification shall prevail.

5.Materials and Manufacture

5.1Materials:

5.1.1The base metal shall be manufactured in accordance with all applicable requirements of the base metal specifica-tions(see4.1.5).

5.1.2The cladding metal shall be manufactured in accor-dance with all applicable requirements of the cladding metal specifications(see4.1.4).

5.2Manufacture:

5.2.1The cladding metal shall be bonded to the base metal by any cladding operation that will produce a clad product which will conform to the requirements of this specification. Cladding methods are,but not limited to,explosion bonding, roll bonding,and weld overlay.

5.2.2The cladding metal may be fabricated from multiple sheets or plates by edge butt welding prior to the cladding operation.

5.2.3The cladding thickness may consist of multiple layers of the cladding metal.

5.3Heat Treatment—Unless otherwise specified or agreed between the purchaser and the manufacturer,all heat treat-ments shall be performed as needed in the cladding operation to assure the following:

5.3.1The cladding metal conforms to the applicable re-quirements of the cladding metal specification.

5.3.2The base metal conforms to the applicable require-ments of the base metal specification,and

5.3.3The clad bond exhibits optimum resistance to dis-bonding during common fabrication processes.

6.Chemical Composition

6.1The clad plate shall conform to any combination of base metal and cladding metal as described in6.2and6.3,and as agreed upon between the purchaser and the manufacturer. 6.2Base Metal—The base metal may be carbon steel or low-alloy steel conforming to the ASTM specifications for steels for either pressure vessels or general structural applications,or other,as agreed upon by the purchaser and manufacturer.The base metal shall conform to the chemical requirements of the specification to which it is ordered.

6.3Cladding Metal—The copper or copper alloy cladding metal specified shall conform to the requirements as to chemical composition prescribed in the respective cladding metal Specifications B96/B96M,B152/B152M,or B171/ B171M,or other copper-base alloy specification as agreed upon by the purchaser and manufacturer.

7.Mechanical Requirements

7.1Tensile Property Requirements:

7.1.1Tensile tests shall be performed on the base metal only.

7.1.2Tensile tests shall conform to the requirements of the Base Metal Specification.

8.Performance Requirements

8.1Bond Strength Requirements:

8.1.1Shear Strength Test:

8.1.1.1When specified in the contract or purchase order,the minimum shear strength of the interface shall be12000psi(84 MPa).The shear test shall be made in the manner indicated in Fig.1.The shear test is not applicable when the specified minimum cladding thickness is0.075in.(1.9mm)or less. 8.1.2Alternate Bond Strength Test:

8.1.2.1As an alternative to the shear strength test provided in8.1.1or when agreed upon by the purchaser and the manufacturer,three bend tests shall be made with the alloy cladding in compression to determine the quality of the bond. These bend tests shall be made using1.5in(38mm)wide by full thickness specimens and shall be bent through an angle of 180°to the bend diameters provided for in either Specification A6/A6M or Specification A20/A20M,in Appendix X4

or

equivalent,as applicable.At least two of the three tests shall show not more than 50%separation on both edges of the bent portion.Greater separation shall be cause for rejection.The bond strength bend test is generally not recommended for cladding thicknesses where the shear test is applicable.8.2Additional mechanical tests may be performed.See Supplementary Requirements.

9.Dimensions and Permissible Variations

9.1Unless otherwise specified herein,permissible varia-tions except for thickness shall be in accordance with Specifi-cations A20/A20M or A6/A6M as applicable based on the base metal specification.

9.2Minimum thickness of the alloy cladding metal and of the backing steel,or of the total composite plate,shall be as required by purchase order documents when ordered to mini-mum thickness.

9.3Permissible variation in thickness when ordered to nominal thicknesses shall be 0.01in.(0.25mm)under each for backing steel or total composite,and 0.03in.(0.76mm)under for the alloy cladding.

9.4Permissible variations for excess thickness of the total composite shall be the greater of 0.125in.(3.2mm)or 10%of the total composite thickness ordered and may occur in either backing steel,cladding,or both,provided the minimum for each is met.

9.5When the product is specified for use as tubesheets,covers,or blind flanges in the ordering information,the flatness tolerances of Table 1shall apply,otherwise flatness shall be in accordance with Specifications A20/A20M or A6/A6M as applicable based on the base metal specification.

9.6When the product is specified for use as tubesheets,covers,or blind flanges in the ordering information and a machined edge condition is specified,the diameter tolerances of Table 2shall apply.

9.7More restrictive or less restrictive permissible variations may be agreed upon by the purchaser and the manufacturer.10.Workmanship,Finish and Appearance

10.1The product shall be free of defects,but blemishes of a nature that do not interfere with the intended application are acceptable.

10.2Unless otherwise specified,the clad surface may be supplied as-rolled,ground,blasted (descaled by means of sand,grit,shot or wire followed by pickling),or 100%conditioned.10.3The cladding metal shall be integrally and continu-ously bonded to the base metal.11.Sampling

11.1The lot size,portion size,and selection of sample pieces shall be taken according to the base metal specifications.11.2Chemical Analysis—A sample for chemical analysis from the finished clad product shall not be taken unless specified in the contract or purchase order.The copper sheet or strip that is used as the cladding for this product is to be sampled and tested as prescribed in its product specification (See 6.3).The steel plate that is used as the base metal in this product is to be sampled and tested as prescribed in either Specifications A20/A20M or A6/A6M .12.Number of Tests and Retests

12.1Test:

12.1.1Chemical Analysis—When specified in the contract or purchase order that a chemical analysis shall be performed on the cladding metal,the base metal,or both,the tests shall

be

SI Equivalents

in.mm in.mm 0.0050.127125.41⁄8 3.1821⁄263.53⁄419.1376.2

FIG.1Test Specimen and Method of Making Shear Test

of Clad Plate

TABLE 1Flatness Tolerances for Tube Sheets,Clad One Side Only A

Total Thickness,in.(mm)Maximum Deviation from True Flatness B for a Given Diameter,Width,or Length,in.(mm)

To 48(1219)Over 48(1219)to 72(1829)Over 72(1829)to 96(2438)Over 96(2438)to 120(3048)Over 120(3048)To 21⁄2(63.5)

1⁄8(3.18)1⁄8(3.18)3⁄16

(4.76)1⁄4(6.35)1⁄2(12.7)Over 21⁄2(63.5)to 4(102)1⁄8

(3.18)1⁄8

(3.18)1⁄4(6.35)1⁄2

(12.7)1⁄2

(12.7)Over 4(102)to 6(152)1⁄8(3.18)1⁄4(6.35)3⁄8(9.52)1⁄2(12.7)1⁄2(12.7)Over 6(152)to 8(203)

3⁄16(4.76)

3⁄8

(9.52)1⁄2

(12.7)1⁄2

(12.7)1⁄2

(12.7)

A Two side clads by special arrangement.

B

Measured distance from an imaginary plane representing the best fit to the part surface.Measurement methods may include,but are not limited

to,planar grids,planar redial wheels,setup on a machining table,or laser surveying.

performed in accordance with the applicable requirements of the Cladding Metal or Base Metal Specifications,or both.12.2Other Tests:

12.2.1Tensile Test—One or more tension tests,as required by the base metal specification,and when specified,one shear test or three bond strength bend tests,as applicable,shall be made,representing each manufacturing lot.Each specimen shall be in the final condition of heat treatment required for the plate,including any SPWHT (Simulated Post Weld Heat Treatment)if required,Supplementary Requirement S3.12.3Retests:

12.3.1When requested by the manufacturer or supplier,a retest shall be permitted when results of test obtained by the purchaser or supplier fail to conform to the requirements of the product specification.

12.3.2The retest shall be as directed in the product speci-fication for the initial test except that the number of test specimens shall be twice that normally required for the specified test.

12.3.3Test results for all specimens shall conform to the product specification requirements in retest.Failure to conform shall be cause for rejection.13.Specimen Preparation

13.1Chemical Analysis:

13.1.1Chemical Analysis may be performed on the clad-ding metal,the base metal,or both,as specified in the contract or purchase order.

13.1.2When chemical analysis is specified for the cladding alloy on finished product,the analysis may be accomplished by wet chemical or instrumental procedures.If wet chemical procedures are used,millings may be taken only when the composite plate thickness is sufficient to permit obtaining millings without danger of contamination from the adjacent layer.If spectrometric procedures are used,the sample shall be exposed on the center line of the cladding when there is sufficient cladding thickness available so that there is no contamination from the adjacent base metal.

13.1.3If chemical analysis is specified by the purchaser for the cladding alloy,it shall be made on a sample taken from the finished product or a broken test specimen.For wet chemical analysis,in order to avoid contamination by the base plate metal,millings of cladding samples shall be taken from the test coupon by removal and discard of all the base metal plus 40%of the cladding thickness from the bonded side,not to exceed 0.063in.(1.6mm).The material shall be cleaned and sufficient millings taken to represent the full cross-section of the remain-der.

13.1.4The results of the chemical analysis shall conform to the requirements of the cladding metal and base metal specifications,as applicable.

13.2Tensile Strength:

13.2.1The test specimen shall be prepared in accordance with the requirements prescribed in the specifications for the base metal.

13.2.2When required by the purchaser,the shear test specimen shall be taken near a top or bottom corner of the plate as rolled,parallel to its longitudinal axis,or other location that is representative of the final product.

13.2.3Bend test specimens for the alternative bond strength tests shall be taken at right angles to its longitudinal axis.14.Test Method

14.1Shear Test:

When specified in the contract or purchase order the product furnished shall conform to the shear test requirements in accordance with 8.1or 8.2.

15.Significance of Numerical Limits

15.1For purposes of determining compliance with the specified limits for requirements listed in the following table and for dimensional tolerances,an observed value or a calcu-lated value shall be rounded as indicated in accordance with the rounding method of Practice E29.

Property

Rounded Unit for Observed or

Calculated Value

Shear Strength

Nearest ksi [5MPa]

16.Inspection

16.1All plates shall be inspected for bond integrity prior to shipment,

16.1.1When mutually agreed upon between the purchaser and the manufacturer,either visual or ultrasonic inspection shall be used when the total plate thickness is less than 0.375in.(9.525mm).When plate total thickness is 0.375in.(9.525mm)or greater,the ultrasonic inspection method shall be performed.Ultrasonic inspection shall be in accordance with 16.2.The extent of examination shall be at the discretion of the manufacturer and sufficient to provide the quality level in 16.2specified by the purchaser.

16.1.2Ultrasonic inspection shall be in accordance with the procedures and methods of Specification A578/A578M .For purposes of defining non-bond,the cladding shall be inter-preted to be non-bonded when there is complete loss of back reflection accompanied by an echo indication from the plane of the interface of the clad and backing steel.Areas within 1in.(25.4mm)of a cut edge on the plate that contain indications exceeding 50%of the back reflection at the bond interface shall be considered to be non-bonded.

16.1.3The extent of ultrasonic examination shall be at the discretion of the manufacturer and sufficient to provide the quality level in 16.2specified by the purchaser.Plates shall be examined with 100%coverage when Supplementary Require-ment S1is specified.

16.2Quality Levels:

16.2.1Class A—No single unbonded area exceeding 1in.(25.4mm)in its longest dimension with total unbonded area not to exceed 1%of the total clad surface area.

TABLE 2Outside Diameter Tolerances for Tubesheets,Covers,or

Blind Flanges when a Machined OD is Specified

Diameter

Tolerance,±

Under 60in.(1.52m)

0.06in.(1.5mm)60.0to 84.0in.(1.52to 2.14m)0.12in.(3.2mm)>84.0in.(>2.13m)

0.25in.(6.4

mm)

(76.2mm)in its longest dimension with total unbonded area not to exceed3%of the total clad surface area.

16.2.3Class C—No single unbonded area exceeding9 in.2(58cm2)with total unbonded area not to exceed5%of the total clad surface area.

16.2.4The Class to be supplied shall be listed on the purchase order.When none has been specified,plates shall be furnished as Class C.

17.Rework of Cladding by Welding

17.1The material manufacturer may rework defects in cladding by welding provided the following requirements are met:

17.1.1When specified in the purchase order,prior approval shall be obtained from the purchaser.

17.1.2The welding procedure and the welders or welding operators shall be qualified in accordance with ASME BPV Code Section IX,as applies to overlays.

17.1.3The defective area shall be removed,and the area prepared for rework shall be examined by a liquid penetrant method compliant with ASME Code Section VIII,Division1, Appendix8,to ensure all defective area has been removed.

17.1.4The rework weld shall be deposited in accordance with a welding procedure and welding materials suitable for the cladding material.The surface condition of the reworked area shall be restored to a condition similar to the rest of the cladding.

17.1.5The reworked area shall be examined by a liquid penetrant method in accordance with ASME Code Section VIII,Division1,Appendix8.

17.1.6The location and extent of the weld rework together with the rework procedure and examination results shall be transmitted as a part of the certification.

17.2The material manufacturer may repair defects in the base metal by welding provided repairs are permitted in the base metal specification and are made in accordance with that specification.

18.Rejection and Rehearing

18.1Rejection:

18.1.1Product that fails to conform to the specification requirements when tested by the purchaser,or purchaser’s agent,shall be subject to rejection.

18.1.2Rejection shall be reported to the manufacturer,or supplier,promptly.In addition,a written notification of rejec-tion shall follow.

18.1.3In case of dissatisfaction with results of the test upon which rejection was based,the manufacturer,or supplier,shall have the option to make claim for a rehearing.

18.2Rehearing:

18.2.1As a result of product rejection,the manufacturer or supplier,shall have the option to make claim for a retest to be conducted by the manufacturer,or supplier,and the purchaser.

18.2.2Samples of the rejected product shall be taken in accordance with this product specification and subjected to test by both parties using the test method(s)specified in this product specification,or alternately,upon agreement of both parties,an independent laboratory may be selected for the test(s)using the test method(s)specified in this product specification.

19.General Requirements for Delivery

19.1Material furnished under this specification shall con-form to the applicable requirements of the current edition of Specifications A6/A6M or A20/A20M as appropriate for the backing metal.

19.2In the event of conflicts between this specification and the general delivery requirement specification for the backing steel,this specification shall apply.

20.Certification

20.1When specified in the purchase order or contract,the purchaser shall be furnished certification that samples repre-senting each lot have been either tested or inspected as directed in this specification and the requirements have been met. 20.2When specified in the purchase order or contract that product is purchased for ASME Boiler and Pressure Vessel Code applications,certification to this specification is manda-tory.

21.Test Report

21.1When specified in the contract or purchase order,a report of the test results shall be furnished.

22.Product Marking

22.1Except as specified in22.2,plates shall be marked in accordance with the requirements of Specifications A6/A6M or A20/A20M for the backing steel as applicable,the cladding alloy designation,and this specification number.

22.2For double-clad material or for material under0.375in.

(9.5mm)nominal in thickness or for clad plates provided with conditioned surfaces,the marking specified in22.1shall be legibly stenciled instead of stamped.

23.Keywords

23.1bond strength;clad;cladding;clad steel plate;copper; copper-base alloy;steel;

tubesheet

SUPPLEMENTARY REQUIREMENTS

Supplementary requirements shall not apply unless specified on the order.

S1.Ultrasonic Inspection of 100%of Surface

S1.1Ultrasonic inspection shall be performed with scanning over 100%of the plate surface.S2.Product Analysis

S2.1A product analysis shall be made on either the cladding metal,base metal,or both as specified in the purchase order.S2.2Testing shall be in accordance with 12.1.1unless S2.4applies.

S2.3The testing frequency shall be agreed upon between purchaser and manufacturer.

S2.4Product verification by Positive Metal Identification (PMI)techniques may be used as an alternate to the require-ments of 12.1.1when mutually agreed upon.

S3.Simulated Post-Weld Heat Treatment of Mechanical

Test Coupons S3.1Prior to testing,the test specimens representing the plate for acceptance purposes for mechanical properties shall

be thermally treated to simulate a post-weld heat treatment,using the heat treatment parameters (such as temperature range,time,and cooling rates)specified in the order.The test results for such heat-treated test specimens shall meet the applicable product specification requirements.S4.Charpy V-Notch Impact Test

S4.1Charpy V-notch impact tests shall be conducted in accordance with Supplementary Requirement S5of Specifica-tions A6/A6M or A20/A20M ,as applicable for the base metal specification.

S5.Ultrasonic Examination of Base Metal for Soundness

in Accordance with Specification A578/A578M S5.1All plates shall be ultrasonically examined for base metal soundness in accordance with the requirements of Specification A578/A578M .The acceptance level shall be specified in the order.

APPENDIX

(Nonmandatory Information)X1.METRIC EQUIV ALENTS

X1.1The SI unit for strength properties now shown is in accordance with the International System of Units (SI).The derived SI unit for force is the newton (N),which is defined as that force which,when applied to a body having a mass of one kilogram,gives it an acceleration of one metre per second squared (N =kg·m/s 2).The derived SI unit for pressure or

stress is the newton per square metre (N/m 2)which has been named the pascal (Pa)by the General Conference on Weights and Measures.Since 1ksi =64757Pa,the metric equiva-lents are expressed as megapascal (MPa),which is the same as MN/m 2and N/mm 2.

SUMMARY OF CHANGES

Committee B05has identified the location of selected changes to this standard since the last issue (B432–09a)that may impact the use of this standard.(Approved Sept.1,2014.)

(1)The specification was revised in few sections to comply with the selected wording in Guide

B950.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.

This standard is copyrighted by ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints (single or multiple copies)of this standard may be obtained by contacting ASTM at the above address or at 610-832-9585(phone),610-832-9555(fax),or service@astm.org (e-mail);or through the ASTM website (www.astm.org).Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center,222Rosewood Drive,Danvers,MA 01923,Tel:(978)6-2600;

http://www.copyright.com/

B432−14

7 Copyright by ASTM Int'l (all rights reserved); Thu May 21 22:26:04 EDT 2015

Downloaded/printed by