1、Designation:B77400(Reapproved 2014)Standard Specification forLow Melting Point Alloys1This standard is issued under the fixed designation B774;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pare
2、ntheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers low-melting point metal alloysand solders,including bismuth-tin,bismuth-lead,bismuth-tin-lead,bismuth-tin-lead-cadmium,bismuth-
3、tin-lead-indium-cadmium,bismuth-tin-lead-indium,indium-lead,and indium-lead-silver,and indium-tin joining together two or more metalsat temperatures below their melting points;blocking forsupport and removable borders;radiation shielding;fusibleplugs;fuses;tube bending;and punch setting.1.1.1 This s
4、pecification shall include those alloys having aliquidus temperature not exceeding 361F(183C),the meltingpoint of the tin lead eutectic.1.1.2 This specification includes low-melting point alloys inthe form of solid bars,ingots,powder and special forms,and inthe form of solid ribbon and wire.1.2 The
5、values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to 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
6、 its use.It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet(MSDS)for this product/materialas provided by the manufacturer,to establish appropriatesafety and health practices,and determine the
7、 applicability ofregulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical CompositionE88 Practice for Sampling Nonferrous Metals and Alloys inCast Form for Determination of Chemical Compo
8、sition2.2 Military Standard:MIL-STD 129 Marking for Shipment and Storage32.3 Federal Standard:Fed.Std.No.123 Marking for Shipment(Civil Agencies)33.Terminology3.1 Definitions:3.1.1 producer,nthe primary manufacturer of the mate-rial.3.2 Definitions of Terms Specific to This Standard:3.2.1 liquidus,n
9、the lowest temperature at which an alloyis fully transformed from a solid to a liquid.3.2.2 lot,nthe term“lot”as used in this specification shallbe defined as follows:for solid alloy metal,a lot shall consistof all the metal of the same time designation,produced fromthe same batch of raw materials u
10、nder essentially the sameconditions,and offered for inspection at one time.3.2.3 lot number,nthe term“lot number”as used in thisspecification refers to a numerical designation for a lot that istraceable to a date of manufacture.3.2.4 solidus,nthe highest temperature at which an alloyis fully transfo
11、rmed from a liquid to a solid.4.Classification4.1 Type DesignationThe type designation shall use thefollowing symbols to properly identify the material:4.1.1 Alloy CompositionThe composition is identified bythree numbers that relate to the melting point in degreesFahrenheit where it is eutectic or s
12、ix numbers where it is arange alloy.4.1.2 FormThe form is indicated by a single letter inaccordance with Table 1.4.1.3 Powder Mesh SizeThe powder mesh size is identi-fied by a size symbol number(Table 2).5.Ordering Information5.1 Orders for material under this specification shall indi-cate the follo
13、wing information,as required,to adequatelydescribe the desired material:1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.02 on Refined Lead,Tin,Antimony,and Their Alloys.Current edition approved Oct
14、.1,2014.Published October 2014.Originallyapproved in 1987.Last previous edition approved in 2010 as B774 00(2010).DOI:10.1520/B0774-00R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume info
15、rmation,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1
16、9428-2959.United States1 5.1.1 Type designation(see 4.1),5.1.2 Detailed requirements for special forms,5.1.3 Dimensions of ribbon and wire solder(see 9.2),5.1.4 Unit weight,5.1.5 Packaging(see Section 18),5.1.6 Marking(see Section 17),5.1.7 ASTM specification designation and year of issue,marked on the purchase order and on the package or spool,and5.1.8 Special requirements,as agreed upon between sup-plier and purchaser.6.Materials and Manufacture6.1 The producer shall use care to have each lot
