ASTM B774-00(2005)
(Specification)Standard Specification for Low Melting Point Alloys
Standard Specification for Low Melting Point Alloys
ABSTRACT
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, 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. This specification shall include those alloys having liquidus temperature not exceeding the melting point of the tin lead eutectic, and alloys in the form of solid bars, ingots, powder and special forms, and in the form of solid ribbon and wire. The composition of the alloys shall conform to the chemical requirements for bismuth, lead, tin, cadmium, indium, silver, copper, antimony, and zinc. Alloys shall be tested and shall conform to specified values for alloy freezing point, and powder mesh size.
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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Standards Content (Sample)
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Designation: B 774 – 00 (Reapproved 2005)
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 MIL-STD 129 Marking for Shipment and Storage
2.3 Federal Standard:
1.1 This specification covers low-melting point metal alloys
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
and soldiers, including bismuth–tin, bismuth–lead, bismuth-
–tin–lead, bismuth–tin–lead–cadmium, bismuth–tin–lead–indi-
3. Terminology
um–cadmium, bismuth–tin–lead–indium, indium–lead, and in-
3.1 Definition:
dium–lead–silver, and indium–tin joining together two or more
3.1.1 producer, n— the primary manufacturer of the mate-
metals at temperatures below their melting points; blocking for
rial.
support and removable borders; radiation shielding; fusible
3.2 Definitions of Terms Specific to This Standard:
plugs; fuses; tube bending; and punch setting.
3.2.1 liquidus, n—the lowest temperature at which an alloy
1.1.1 This specification shall include those alloys having a
is fully transformed from a solid to a liquid.
liquidus temperature not exceeding 361°F (183°C), the melting
3.2.2 lot, n—theterm“lot”asusedinthisspecificationshall
point of the tin lead eutectic.
be defined as follows: for solid alloy metal, a lot shall consist
1.1.2 This specification includes low-melting point alloys in
of all the metal of the same time designation, produced from
the form of solid bars, ingots, powder and special forms, and in
the same batch of raw materials under essentially the same
the form of solid ribbon and wire.
conditions, and offered for inspection at one time.
1.2 The values stated in inch-pound units are to be regarded
3.2.3 lot number, n— the term “lot number” as used in this
as the standard. The values given in parentheses are for
specification refers to a numerical designation for a lot that is
information only.
traceable to a date of manufacture.
1.3 This standard does not purport to address all of the
3.2.4 solidus, n—The highest temperature at which an alloy
safety concerns, if any, associated with its use. It is the
is fully transformed from a liquid to a solid.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
4. Classification
Material Safety Data Sheet (MSDS) for this product/material
4.1 Type Designation—The type designation shall use the
as provided by the manufacturer, to establish appropriate
following symbols to properly identify the material:
safety and health practices, and determine the applicability of
4.1.1 Alloy Composition—The composition is identified by
regulatory limitations prior to use.
three numbers that relate to the melting point in degrees
2. Referenced Documents Fahrenheit where it is eutectic or six numbers where it is a
2 range alloy.
2.1 ASTM Standards:
4.1.2 Form—The form is indicated by a single letter in
E55 PracticeforSamplingWroughtNonferrousMetalsand
accordance with Table 1.
Alloys for Determination of Chemical Composition
4.1.3 Powder Mesh Size—The powder mesh size is identi-
E88 Practice for Sampling Nonferrous Metals and Alloys
fied by a size symbol number (Table 2).
in Cast Form for Determination of Chemical Composition
2.2 Military Standard:
5. Ordering Information
5.1 Orders for material under this specification shall indi-
This specification is under the jurisdiction of ASTM Committee B02 on
cate the following information, as required, to adequately
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
describe the desired material:
B02.02 on Refined Lead, Tin, Antimony, and Their Alloys.
5.1.1 Type designation (see 4.1),
Current edition approved Nov. 1, 2005. Published February 2006. Originally
5.1.2 Detailed requirements for special forms,
approved in 1987. Last previous edition approved in 2000 as B 774 - 00.
For 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 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
the ASTM website. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
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B 774 – 00 (2005)
TABLE 1 Form NOTE 1—By mutual agreement between the supplier and the purchaser,
analysis may be required and limits established for elements or com-
Symbol Form
pounds not specified in Table 3.
B bar
I ingot
8. Physical and Performance Requirements
P powder
R ribbon 8.1 Alloy must freeze within 2°F of its solidus.
S special (includes pellets, preforms, shot, etc.
8.2 Powder Mesh Size—The powder mesh size shall be as
W wire
specified in 5.1.1 and 4.1.3.
9. Dimensions and Unit Weight
TABLE 2 Powder Mesh Size
9.1 Bar and Ingot—The dimensions and unit weight of bar
Size Symbol Powder Mesh Size
and ingot shall be agreed between the supplier and purchaser.
3 325
9.2 Wire (Solid)—The dimensions and unit weight of wire
2 200
alloys shall be as specified in 5.1.3 and 5.1.4. The tolerance on
1 100
the specified outside diameter shall be 65% or 60.002 in.
(0.05 mm), whichever is greater.
9.3 Other Forms:
5.1.3 Dimensions of ribbon and wire solder (see 9.2), 9.3.1 Dimensions for ribbon and special forms shall be as
5.1.4 Unit weight, agreed between the supplier and purchaser.
5.1.5 Packaging (see Section 18), 9.3.2 The unit weight of alloy powder shall be as specified
5.1.6 Marking (see Section 17), in 5.1.4.
5.1.7 ASTM specification designation and year of issue,
10. Workmanship, Finish, and Appearance
marked on the purchase order and on the package or spool, and
10.1 All forms of the alloys shall be processed in such a
5.1.8 Special requirements, as agreed upon between sup-
manner as to be uniform in quality and free of defects that will
plier and purchaser.
affect life, serviceability, or appearance.
6. Materials and Manufacture
11. Sampling for Chemical Analysis
6.1 The producer shall use care to have each lot of alloy as
11.1 Care must be taken to ensure that the sample selected
uniforminqualityaspracticableandofsatisfactoryappearance
for testing is representative of the material. The method of
in accordance with the best industrial practices. Each bar,
sampling shall consist of one of the following methods:
ingot, or other form in which the alloy is sold shall be uniform
11.1.1 Samplesmaybetakenfromthefinalsolidifiedcastor
in composition within the entire lot.
fabricated product.
11.1.2 Representative samples may be obtained from the lot
7. Chemical Composition
of molten metal during casting. The molten sample shall be
7.1 The composition of the alloys covered by this specifi- poured into a cool mold, forming a bar approximately 0.25 in.
cation shall be as shown in Table 3. (6.4 mm) thick.
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 44.0–45.0 0.01 0.005 0.008 0.001 0.08 0.1 0.08 255 124 255 124
281 57.5–58.5 0.05 41.5–42.5 0.005 0.008 0.01 0.08 0.1 0.08 281 138 281 138
281–338 39.5–40.5 0.05 59.5–60.5 0.005 0.008 0.01 0.08 0.1 0.08 281 138 338 170
291–325 13.5–14.5 42.5–43.5 42.5–43.5 0.005 0.008 0.01 0.08 0.1 0.08 291 144 325 163
244 0.01 0.05 47.5–48.5 0.
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