ASTM B860-2009a Standard Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing.pdf

1、Designation: B860 09aStandard Specification forZinc Master Alloys for Use in Hot Dip Galvanizing1This standard is issued under the fixed designation B860; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A

2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers zinc master alloys which areused in hot dip galvanizing for the purpose of adjusting theconcentration of ce

3、rtain alloying elements in the molten zincbath. Table 1 covers the chemical composition of thesematerials which include six master alloys of zinc-aluminum(brightener) and one master alloy of zinc-antimony.ASTM Common UNSType A-1 90/10 Zn/Al High Purity Z30750Type A-2 90/10 Zn/Al Low Purity Z31710Typ

4、e A-3 95/5 Zn/Al High Purity Z30503Type A-4 95/5 Zn/Al Low Purity Z31510Type A-5 96/4 Zn/Al High Purity .Type A-6 96/4 Zn/Al Low Purity .Type S-1 90/10 Zn/Sb Z557101.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to

5、SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified

6、in the appropriateMaterial Safety Data Sheet (MSDS) for this product/materialas provided by the manufacturer, to establish appropriatesafety and health practices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in

7、effect on dateof order acceptance form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B897 Specification for Configuration of Zinc and ZincAlloy Jumbo Block and Half Block IngotB899 Terminology Relating to Non-ferrous Metals andAlloysE29 Practice for Using Significan

8、t Digits in Test Data toDetermine Conformance with SpecificationsE88 Practice for Sampling Nonferrous Metals and Alloys inCast Form for Determination of Chemical CompositionE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)E536 Test Methods for Chemical Analysis of Zi

9、nc and ZincAlloys2.3 ISO Standards:3ISO 3815-1 Zinc and zinc alloys Part 1:Analysis of solidsamples by optical emission spectrometryISO 3815-2 Zinc and zinc alloys Part 2: Analysis byinductively coupled plasma optical emission spectrometry3. Terminology3.1 Terms defined in Terminology B899 shall app

10、ly unlessdefined otherwise in this standard.3.2 Definitions of Terms Specific to This Standard:3.2.1 brightener bar, nbrightener bar is a zinc alloycontaining aluminum which is added to the galvanizing bath toadjust the aluminum content of the bath to: suppress theformation of iron-zinc alloy layers

11、, increase the brightness andductility of the galvanized coating, and improve the drainage ofzinc from the work as it exits the bath; also called brightener.4. Ordering Information4.1 Orders for ingots under this specification shall includethe following information:4.1.1 Quantity, lb,4.1.2 Alloy typ

12、e (see Table 1),4.1.3 Size and type of ingot (jumbo, type 1 block, type 2block, slab or other ingot shape), if not manufacturers stan-dard,4.1.4 Specification number and year date,4.1.5 Source inspection (see Section 8), and1This specification is under the jurisdiction of ASTM Committee B02 onNonfer

13、rous Metals and Alloys and is the direct responsibility of SubcommitteeB02.04 on Zinc and Cadmium.Current edition approved Oct. 1, 2009. Published November 2009. Originallyapproved in 1995. Last previous edition approved in 2009 as B860 - 09. DOI:10.1520/B0860-09a.2For referenced ASTM standards, vis

14、it the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York

15、, NY 10036, http:/www.ansi.org.1*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.4.1.6 Marking (see Section 10).5. Materials and Manufacture5.1 The material covered by t

16、his specification shall be ofuniform quality and shall be free from harmful contamination.The ingot surface shall contain a minimum of dross andadhering foreign matter.6. Chemical Requirements6.1 LimitsThe alloys shall conform to the requirements asto chemical composition prescribed in Table 1. Conf

17、ormanceshall be determined by the producer by analyzing samplestaken at the time the ingots are made. If the producer hasdetermined the chemical composition of the metal during thecourse of manufacture, he shall not be required to sample andanalyze the finished product.6.2 In case of dispute, the fo

18、llowing requirements shallapply:6.2.1 Number of SamplesSamples for verification ofchemical composition shall be taken as follows:6.2.1.1 Not less than five ingots shall be taken at randomfrom each car or truckload of the same alloy for sampling.Each heat in the shipment shall be represented. If the

19、shipmentis less than a carload lot, one sample ingot shall be taken foreach 10 000 lb (4540 kg) or fraction thereof. When it is deemednecessary, a sample may be taken from each melt of 1000 lb(454 kg) or more.6.3 Methods of SamplingSamples from ingots for deter-mination of chemical composition shall

20、 be taken in accordancewith one of the following methods:6.3.1 Samples for chemical analysis shall be taken from thematerial by drilling, sawing, milling, turning, or clipping arepresentative piece or pieces to obtain weight of preparedsample not less than 100 g. Sampling shall be in accordancewith

21、Practice E88.6.3.2 By agreement, an optional method of sampling wouldbe to select, at random, ingots of the same heat, melt togetherrepresentative portions of each ingot selected, and cast a disc orsuitable sample from the liquid composite for spectrographic orchemical analysis.6.3.3 Samples for che

22、mical analysis may also be in the formof a separately cast spectrographic disc specimen taken fromthe same pour used to cast the ingot.6.3.4 Alternate procedures for sampling and exchange ofsamples shall be agreed upon between the producer and thecustomer.6.4 Method of AnalysisThe determination of c

23、hemicalcomposition shall be made in accordance with suitable chemi-cal Test Methods E536, suitable spectrochemical methodsISO 3815-1 and ISO 3815-2, or other methods. In case ofdispute, the results should preferably be secured by TestMethods E536,orISO 3815-1 or ISO 3815-2 and shall be thebasis of a

24、cceptance.7. Size and Shape7.1 Master alloys may be ordered as jumbos, blocks, slabsor other ingot configurations.7.1.1 Jumbolarge casting of zinc or zinc alloy, havingthrough holes for chains, designed for handling by mechanicalequipment, which is also referred to as a jumbo or strip jumbo.See Spec

25、ification B897 for additional details.7.1.2 Blocklarge casting of zinc or zinc alloy, having liftpockets, designed for handling by mechanical equipment,which is also referred to as block. See Specification B897 foradditional details.7.1.3 Slabsmaller casting of zinc or zinc alloy, designedfor manual

26、 handling. A slab usually weighs about 55 lb (25 kg)but may weigh any where from 40 to 60 lb (18 to 27 kg). Slabsare usually shipped in strapped bundles weighing about 2200 lb(one metric ton).TABLE 1 Chemical Requirements Composition, % (Range or Maximum Value)AType A-1 90 % Zinc10 % Aluminum (90/10

27、 Zn/Al) High PurityType A-2 90 % Zinc10 % Aluminum (90/10 Zn/Al) Low PurityType A-3 95 % Zinc5 % Aluminum (95/5 Zn/Al) High PurityType A-4 95 % Zinc5 % Aluminum (95/5 Zn/Al) Low PurityType A-5 96 % Zinc4 % Aluminum (96/4 Zn/Al) High PurityType A-6 96 % Zinc4 % Aluminum (96/4 Zn/Al) Low PurityType S-

28、1 90 % Zinc10 % Antimony (90/10 Zn/Sb)UNSBType A-190/10 Zn/AlZ30750Type A-290/10 Zn/AlZ31710Type A-395/5 Zn/AlZ30503Type A-495/5 Zn/AlZ31510Type A-596/4 Zn/AlZXXXXXType A-696/4 Zn/AlZXXXXXType S-190/10 Zn/SbZ55710Fe 0.05 max 0.15 max 0.05 max 0.15 max 0.05 max 0.15 max 0.03 maxPb 0.005 max 0.4 max 0

29、.005 max 0.4 max 0.0005 max 0.4 max 0.015 maxCd 0.004 max . 0.004 max . 0.004 max . 0.003 maxCu 0.035 max 0.5 max 0.035 max 0.5 max 0.035 max 0.5 max 0.003 maxMg . . . . 0.06 max 0.06 maxSn 0.003 max . 0.003 max . 0.003 max . 0.01 maxAs . . . . . . 0.015 maxAl 9.510.5 9.510.5 4.55.5 4.55.5 4.0-4.5 4

30、.0-4.5 .SbC. . . . . . 9.510.5Others, Total 0.01 max 0.25 max 0.01 max 0.25 max 0.01 max 0.25 max 0.03 maxZnDRemainder Remainder Remainder Remainder Remainder Remainder RemainderAThe following applies to all specified limits in this table: For purposes of determining conformance with this specificat

31、ion, an observed value obtained from analysisshall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with the rounding method of Practice E29.BUNS numbers in conformance with Practice E527.CChemical method under developmen

32、t.DFor information only. Quantitative determination of this element is not required. Zinc is assumed to be the difference between 100 % and the sum of those elementslisted above.B860 09a27.1.4 Other shapes and sizes as may be agreed uponbetween the producer and the customer may be cast to thechemica

33、l requirements of this specification.8. Source Inspection8.1 If the purchaser desires that his representative inspect orwitness the inspection and testing of the product prior toshipment, such agreement shall be made by the purchaser andproducer or supplier as part of the contract or purchase order.

34、8.2 When such inspection or witness of inspection andtesting is agreed upon, the producer or supplier shall afford thepurchasers representative all reasonable facilities to satisfyhim that the product meets the requirements of this specifica-tion. Inspection and tests shall be conducted in such a ma

35、nnerthat there is no unnecessary interference with the producersoperations.9. Rejection and Rehearing9.1 Material that fails to conform to the requirements of thisspecification may be rejected. Rejection should be reported tothe producer or supplier promptly and in writing. In case ofdissatisfaction

36、 with the results of the test, the producer orsupplier may make claim for a rehearing. If the rehearingestablishes that the material does not conform to the require-ments of this specification, it should be rejected and returned tothe producer.10. Identification Marking10.1 All ingots shall be prope

37、rly marked for identificationwith the producers name or brand.10.2 Each bundle or skid shall be identified with the bundleweight and the producers heat number.11. Packaging11.1 Unless otherwise specified, the ingot shall be packagedto provide easy access for unloading by overhead crane orforklift. E

38、ach package shall contain only one alloy unlessotherwise agreed upon.12. Keywords12.1 brightener; zinc; zinc alloys; zinc-aluminum alloy;zinc-antimony alloy; zinc master alloys; zinc metalSUMMARY OF CHANGESCommittee B02has identified the location of selected changes to this standard since the last i

39、ssue (B860 - 09)that may impact the use of this standard. (Approved October 1, 2009.)(1) The reference to Test Methods E47 as a method to analyzefor tin only has been removed.Committee B02 has identified the location of selected changes to this standard since the last issue (B860 - 08)that may impac

40、t the use of this standard. (Approved April 15, 2009.)(1) A definition of the term brightener bar has been added toSpecification B860.Committee B02 has identified the location of selected changes to this standard since the last issue (B860 - 07)that may impact the use of this standard. (Approved Nov

41、ember 1, 2008.)(1) Revisions have been made to Sections 2.3 and 6.4 to addanalytical spectrochemical methods ISO 3815-1 andISO 3815-2.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standa

42、rd are expressly advised that determination of the validity of any such patent rights, and the riskof 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 andif

43、 not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, whi

44、ch you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr 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 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).B860 09a3