ASTM B774-00
(Specification)Standard Specification for Low Melting Point Alloys
Standard Specification for Low Melting Point Alloys
SCOPE
1.1 This specification covers low-melting point metal alloys and soldiers, including bismuth-tin, bismuth-lead, bismuth-tin-lead, bismuth-tin-lead-cadmium, bismuth-tin-lead-indium-cadmium, bismuth-tin-lead-indium, indium-lead, and indium-lead-silver, and indium-tin joining together two or more metals at temperatures below their melting points; blocking for support and removable borders; radiation shielding; fusible plugs; fuses; tube bending; and punch setting.
1.1.1 This specification shall include those alloys having a liquidus temperature not exceeding 361oF (183oC), the melting point of the tin lead eutectic.
1.1.2 This specification includes low-melting point alloys in the form of solid bars, ingots, powder and special forms, and in the form of solid ribbon and wire.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: B 774 – 00
Standard Specification for
Low Melting Point Alloys
This standard is issued under the fixed designation B 774; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This specification covers low-melting point metal alloys 3.1 Definition:
and soldiers, including bismuth–tin, bismuth–lead, bismuth- 3.1.1 producer— the primary manufacturer of the material.
–tin–lead, bismuth–tin–lead–cadmium, bismuth–tin–lead–indi- 3.2 Definitions of Terms Specific to This Standard:
um–cadmium, bismuth–tin–lead–indium, indium–lead, and in- 3.2.1 liquidus—the lowest temperature at which an alloy is
dium–lead–silver, and indium–tin joining together two or more fully transformed from a solid to a liquid.
metals at temperatures below their melting points; blocking for 3.2.2 lot—the term “lot” as used in this specification shall
support and removable borders; radiation shielding; fusible be defined as follows: for solid alloy metal, a lot shall consist
plugs; fuses; tube bending; and punch setting. of all the metal of the same time designation, produced from
1.1.1 This specification shall include those alloys having a the same batch of raw materials under essentially the same
liquidus temperature not exceeding 361°F (183°C), the melting conditions, and offered for inspection at one time.
point of the tin lead eutectic. 3.2.3 lot number— the term “lot number” as used in this
1.1.2 This specification includes low-melting point alloys in specification refers to a numerical designation for a lot that is
the form of solid bars, ingots, powder and special forms, and in traceable to a date of manufacture.
the form of solid ribbon and wire. 3.2.4 solidus—The highest temperature at which an alloy is
1.2 The values stated in inch-pound units are to be regarded fully transformed from a liquid to a solid.
as the standard. The values given in parentheses are for
4. Classification
information only.
4.1 Type Designation— The type designation shall use the
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the following symbols to properly identify the material:
4.1.1 Alloy Composition—The composition is identified by
responsibility of the user of this standard to establish appro-
three numbers that relate to the melting point in degrees
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Farenheit where it is eutectic or six numbers where it is a range
alloy.
2. Referenced Documents
4.1.2 Form—The form is indicated by a single letter in
2.1 ASTM Standards: accordance with Table 1.
E 55 Practice for SamplingWrought Nonferrous Metals and 4.1.3 Powder Mesh Size— The powder mesh size is iden-
Alloys for Determination of Chemical Composition tified by a size symbol number (Table 2).
E 88 Practice for Sampling Nonferrous Metals and Alloys
2 5. Ordering Information
in Cast Form for Determination of Chemical Composition
5.1 Orders for material under this specification shall indi-
2.2 Military Standard:
MIL-STD 129 Marking for Shipment and Storage cate the following information, as required, to adequately
describe the desired material:
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies) 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),
This specification is under the jurisdiction of ASTM Committee B02 on
5.1.4 Unit weight,
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
5.1.5 Packaging (see Section 18),
B02.02 on Refined Lead, Tin, Antimony, and Their Alloys.
5.1.6 Marking (see Section 17),
Current edition approved Oct. 10, 2000. Published November 2000. Originally
published as B 774-87. Last previous edition B 774-95).
5.1.7 ASTM specification designation and year of issue,
Annual Book of ASTM Standards, Vol 03.05.
marked on the purchase order and on the package or spool, and
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 774
TABLE 1 Form
9. Dimensions and Unit Weight
Symbol Form
9.1 Bar and Ingot— The dimensions and unit weight of bar
B bar
and ingot shall be agreed between the supplier and purchaser.
I ingot
9.2 Wire (Solid)— The dimensions and unit weight of wire
P powder
R ribbon
alloys shall be as specified in 5.1.3 and 5.1.4. The tolerance on
S special (includes pellets, preforms, shot, etc.
the specified outside diameter shall be 65% or 60.002 in.
W wire
(0.05 mm), whichever is greater.
9.3 Other Forms:
TABLE 2 Powder Mesh Size
9.3.1 Dimensions for ribbon and special forms shall be as
Size Symbol Powder Mesh Size
agreed between the supplier and purchaser.
3 325
9.3.2 The unit weight of alloy powder shall be as specified
2 200
in 5.1.4.
1 100
10. Workmanship, Finish, and Appearance
5.1.8 Special requirements, as agreed upon between sup-
10.1 All forms of the alloys shall be processed in such a
plier and purchaser.
manner as to be uniform in quality and free of defects that will
affect life, serviceability, or appearance.
6. Materials and Manufacture
6.1 The producer shall use care to have each lot of alloy as
11. Sampling for Chemical Analysis
uniforminqualityaspracticableandofsatisfactoryappearance
11.1 Care must be taken to ensure that the sample selected
in accordance with the best industrial practices. Each bar,
for testing is representative of the material. The method of
ingot, or other form in which the alloy is sold shall be uniform
sampling shall consist of one of the following methods:
in composition within the entire lot.
11.1.1 Samplesmaybetakenfromthefinalsolidifiedcastor
7. Chemical Composition fabricated product.
11.1.2 Representative samples may be obtained from the lot
7.1 The composition of the alloys covered by this specifi-
of molten metal during casting. The molten sample shall be
cation shall be as shown in Table 3.
poured into a cool mold, forming a bar approximately 0.25 in.
NOTE 1—By mutual agreement between the supplier and the purchaser,
(6.4 mm) thick.
analysis may be required and limits established for elements or com-
11.2 Frequency of Sampling—Frequency of sampling for
pounds not specified in Table 3.
determination of chemical composition shall be in accordance
8. Physical and Performance Requirements
withTable 4. For spools and coils, the sample shall be obtained
8.1 Alloy must freeze within 2°F of its solidus. by cutting back 6 ft (1.8 m) of wire from the free end and then
8.2 Powder Mesh Size— The powder mesh size shall be as
taking the next 6 ft for test. In other forms, an equivalent
specified in 5.1.1 and 4.1.3. sample shall be selected at random from the container.
TABLE 3 Chemical Requirements Composition, wt. %
(range or maximum rules)
Alloy Constituents — wt % Melting Points
Designation
Solidus Liquidus
Bi Pb Sn Cd In Ag Cu Sb Zn °F °C °F °C
117 44.2–45.2 22.1–23.1 7.8–8.8 4.8–5.8 18.6–19.6 0.001 0.08 0.1 0.08 117 47 117 47
129–133 48.14–50.14 16.92–18.92 10.55–12.55 129 54 133 56
136 48.5–49.5 17.5–18.5 11.5–12.5 0.005 20.5–21.5 0.001 0.08 0.1 0.08 136 58 136 58
158 49.5–50.5 26.2–27.2 12.8–13.8 9.5–10.5 0.008 0.001 0.08 0.1 0.08 158 70 158 70
158–165 49.5–50.5 24.45–25.45 12.0–13.0 12.0–13.0 0.10 158 70 165 74
158–190 42.0–43.0 37.2–38.2 10.8–11.8 8.0–9.0 0.008 0.001 0.08 0.1 0.08 158 70 190 88
174 56.5–57.5 0.05 16.5–17.5 0.005 25.5–26.5 0.001 0.08 0.1 0.08 174 79 174 79
203 52.0–53.0 31.5–32.5 15.0–16.0 0.005 0.008 0.001 0.08 0.1 0.08 203 95 203 95
203–239 49.5–50.5 24.5–25.5 24.5–25.5 203 95 239 115
216–217 53.5–54.5 25.5–26.5 19.5–20.5 216 102 217 103
255 55.0–56.0 44.0–45
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