ASTM B860-2018 Standard Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing.pdf

1、Designation: B860 17B860 18Standard 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 revis

2、ion. A 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 are used in hot dip galvanizing for the purpose of adjusting theconcentratio

3、n of certain alloying elements in the molten zinc bath. Table 1 covers the chemical composition of these materialswhich 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

4、Z31710Type 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 Z31520Type A-6 96/4 Zn/Al Low Purity Z30504Type S-1 90/10 Zn/Sb Z55710NOTE 1The master alloys in Specification B860 are intended to be used primarily in hot-dip galvanizing to adjust the

5、concentration of certainelements in a molten zinc bath, and differ from the zinc-aluminum alloys in Specification B997 which are intended to be used primarily in moltenzinc-aluminum.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathemat

6、icalconversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to become familiar with all hazards inclu

7、ding those identified in the appropriate Safety Data Sheet(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmentalpractices, and determine the applicability of regulatory limitations prior to use.1.4 This international standard was d

8、eveloped in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Doc

9、uments2.1 The following documents of the issue in effect on date of order acceptance form a part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B897 Specification for Configuration of Zinc and Zinc Alloy Jumbo, Block, Half Block, and Slab IngotB899 Terminology Relating to N

10、on-ferrous Metals and AlloysB949B997 Specification for Zinc-Aluminum Alloys in Ingot Form for Hot-Dip CoatingsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Ch

11、emical CompositionE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys2.3 ISO Standards:3ISO 3815-1 Zinc and zinc alloys Part 1: Analysis of solid samples by optical emission spectrometryISO 3815-2 Zinc and

12、 zinc alloys Part 2: Analysis by inductively coupled plasma optical emission spectrometry1 This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.04 on Zincand Cadmium.Current edition approved June 1, 20

13、17Nov. 1, 2018. Published September 2017January 2019. Originally approved in 1995. Last previous edition approved in 20162017as B860 16.17. DOI: 10.1520/B0860-17.10.1520/B0860-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org.

14、For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.This document is not an ASTM standard and is intended

15、 only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit 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 v

16、ersionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Terms defined in T

17、erminology B899 shall apply unless defined otherwise in this standard.3.2 Definitions of Terms Specific to This Standard:3.2.1 brightener bar, nbrightener bar is a zinc alloy containing aluminum which is added to the galvanizing bath to adjust thealuminum content of the bath to: suppress the formati

18、on of iron-zinc alloy layers, increase the brightness and ductility of thegalvanized coating, and improve the drainage of zinc from the work as it exits the bath; also called brightener.4. Ordering Information4.1 Orders for ingots under this specification shall include the following information:4.1.

19、1 Quantity, lb,4.1.2 Alloy type (see Table 1),4.1.3 Size and type of ingot (jumbo, type 1 block, type 2 block, slab or other ingot shape), if not manufacturers standard,4.1.4 Specification number and year date,4.1.5 Source inspection (see Section 8), and4.1.6 Marking (see Section 10).5. Materials an

20、d Manufacture5.1 See Specification B949.6. Chemical Requirements6.1 See Specification B949.7. Size and Shape7.1 Master alloys may be ordered as jumbos, blocks, jumbos or blocks, as specified in Specification B897slabs or other ingotconfigurations Master alloys may be ordered as slabs varying in weig

21、ht for 40 to 60 lb (18 to 27 kg) which are all consideredstandard slabs.7.1.1 Jumbolarge casting of zinc or zinc alloy, having through holes for chains, designed for handling by mechanicalequipment, which is also referred to as a jumbo or strip jumbo. See Specification B897 for additional details.7.

22、1.2 Blocklarge casting of zinc or zinc alloy, having lift pockets, designed for handling by mechanical equipment, which isalso referred to as block. See Specification B897 for additional details.7.1.3 Slabsmaller casting of zinc or zinc alloy, designed for manual handling. A slab usually weighs abou

23、t 55 lb (25 kg) butmay weigh any where from 40 to 60 lb (18 to 27 kg). Slabs are usually shipped in strapped bundles weighing about 2200 lb (onemetric ton).TABLE 1 Chemical Requirements Composition, % (Range or Maximum Value)AType A-1 90 % Zinc10 % Aluminum (90/10 Zn/Al) High PurityType A-2 90 % Zin

24、c10 % 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-1 90 % Zinc10 % Antimony (90/10 Zn/S

25、b)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/AlZ31520Type A-696/4 Zn/AlZ30504Type 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 0.005 max 0.4 max 0.005 max 0.4 max 0

26、.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 4.0-4.5 .SbC . . . . . . 9.510.5Others

27、, Total 0.01 max 0.25 max 0.01 max 0.25 max 0.01 max 0.25 max 0.03 maxZnD Remainder Remainder Remainder Remainder Remainder Remainder RemainderA The following applies to all specified limits in this table: For purposes of determining conformance with this specification, an observed value obtained fr

28、om analysis shallbe 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.B UNS numbers in conformance with Practice E527.C Chemical method under development.D For information only. Quanti

29、tative determination of this element is not required. Zinc is assumed to be the difference between 100 % and the sum of those elements listedabove.B860 1827.1.1 Brightener Barsmaller casting of zinc or zinc alloy, designed for manual handling. A bar usually weighs about 20 lb (9kg) but may weigh any

30、where from 18 to 22 lb (8 to 10 kg). Bars are usually shipped in strapped bundles weighing about 2200lb (one metric ton).7.1.2 Other shapes and sized as may be agreed upon between the producer and the customer may be cast to the chemicalrequirements of this specification.8. Source Inspection8.1 See

31、Specification B949.9. Rejection and Rehearing9.1 See Specification B949.10. Identification Marking10.1 See Specification B949.11. Packaging11.1 See Specification B949.12. Keywords12.1 brightener; zinc; zinc alloys; zinc-aluminum alloy; zinc-antimony alloy; zinc master alloys; zinc metalSUMMARY OF CH

32、ANGESCommittee B02 has identified the location of selected changes to this standard since the last issue(B86016)17) that may impact the use of this standard. (Approved June 1, 2017.)November 1 2018.)(1) The bar ingot was added in section 7.1.4.Section 7, Size and Shape was revised to be consistent w

33、ith the corresponding sectionin Specification B6.Committee B02 has identified the location of selected changes to this standard since the last issue(B86015)16) that may impact the use of this standard. (Approved May 1, 2016.)June 1, 2017.)(1) References to Specification B949 were added and section n

34、umbers were eliminated.The bar ingot was added in section 7.1.4.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any suc

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