ASTM B753-07(2018)
(Specification)Standard Specification for Thermostat Component Alloys
Standard Specification for Thermostat Component Alloys
ABSTRACT
This specification details the requirements for alloys to be used as components in the manufacture of bonded multi-component thermostat metal strip. It describes alloys having composition, and thermal expansion suitable for application in thermostat metal sheet and strip. The material shall be free of scale, slivers, cracks, seams, corrosion and other defects as best commercial practice will permit. Surfaces shall be uniform and sufficiently clean. Product surface condition can be agreed upon between supplier and purchaser since surface condition can vary for different alloys and because bonding practices vary. The material shall be made of carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, copper, aluminum, cobalt, and iron. This product shall be supplied in the condition agreed upon by purchaser and seller. Hardness shall be measured on representative samples from each heat treat lot.
SCOPE
1.1 This specification describes requirements for alloys to be used as components in the manufacture of bonded multi-component thermostat metal strip. More specifically it describes alloys having composition, and thermal expansion suitable for application in thermostat metal sheet and strip.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions 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 responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B753 −07 (Reapproved 2018)
Standard Specification for
Thermostat Component Alloys
This standard is issued under the fixed designation B753; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope B162 Specification for Nickel Plate, Sheet, and Strip
B388 Specification for Thermostat Metal Sheet and Strip
1.1 This specification describes requirements for alloys to
E18 Test Methods for Rockwell Hardness of Metallic Ma-
be used as components in the manufacture of bonded multi-
terials
component thermostat metal strip. More specifically it de-
E228 Test Method for Linear Thermal Expansion of Solid
scribes alloys having composition, and thermal expansion
Materials With a Push-Rod Dilatometer
suitable for application in thermostat metal sheet and strip.
1.2 The values stated in inch-pound units are to be regarded
3. Ordering Information
as standard. The values given in parentheses are mathematical
3.1 Orders for this material under this specification shall
conversions to SI units that are provided for information only
and are not considered standard. include the following information:
3.1.1 Alloy type,
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.2 Size,
responsibility of the user of this standard to become familiar
3.1.3 Surface finish,
with all hazards including those identified in the appropriate
3.1.4 Marking and packaging, and
Safety Data Sheet (SDS) for this product/material as provided
3.1.5 Certification, if required.
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability
4. General Requirements
of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
4.1 The material shall be free of scale, slivers, cracks,
dance with internationally recognized principles on standard-
seams, corrosion and other defects as best commercial practice
ization established in the Decision on Principles for the
will permit. Surfaces shall be uniform and sufficiently clean so
Development of International Standards, Guides and Recom-
that commonly used methods of surface preparation, or pre-
mendations issued by the World Trade Organization Technical
bond cleaning will allow bonding of the entire mating surfaces.
Barriers to Trade (TBT) Committee.
Since surface condition can vary for different alloys and
because bonding practices vary, product surface condition can
2. Referenced Documents
be agreed upon between supplier and purchaser.
2.1 ASTM Standards:
A480/A480M Specification for General Requirements for
5. Chemical Composition
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
5.1 The material shall be manufactured to the chemical
Sheet, and Strip
compositions shown in Table 1.
B63 Test Method for Resistivity of Metallically Conducting
Resistance and Contact Materials
5.2 The manufacturer will insure uniformity of composition
B152/B152M Specification for Copper Sheet, Strip, Plate,
throughoutaheatlottoprovideuniformthermalexpansionand
and Rolled Bar
electrical resistivity properties. See Specifications B152/
B152M and B162.
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6. Thermal Expansion Requirements
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
Current edition approved Nov. 1, 2018. Published November 2018. Originally
6.1 Samples tested in accordance with 6.2 shall exhibit
approved in 1986. Last previous edition approved in 2013 as B753 – 07 (2013).
thermal expansion properties described in Table 2.
DOI: 10.1520/B0753-07R18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 One test sample representing each heat lot shall be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
machined to a suitable specimen configuration, heat treated in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. accordance with instructions in Table 2 andTest Method E228.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B753−07 (2018)
TABLE 1 Suggested Compositions For Thermostat Alloys All Elements Indicated As Weight Percent
NOTE 1—Composition requirements show major elements as being nominal. These nominal requirements indicate they are to be adjusted by the
manufacturer so that the alloys meet the requirements for thermal expansion shown in Table 2. Other elements not shown, may be present in residual
amounts. These shall not be present in sufficient quantity as to significantly affect the performance in the intended application.
Alloy Description T-10 T-20 T-22 T-18 T-19 T-14 T-25
Carbon 0.1 max 0.05 max 0.12 nom 0.15 max 0.5 nom 0.5 max 0.15 max
Manganese 72.0 nom 6.5 nom 0.60 max 0.80 max 1.0 nom 9.0 nom 1.0 max
Silicon, max 0.25 0.3 0.30 0.50 0.40 0.30 1.0
Phosphorus, max 0.030 0.02 0.025 0.025 0.025 0.025 0.025
Sulfur, max 0.030 0.01 0.025 0.025 0.025 0.025 0.025
Chromium 0.25 max . 3.0 nom 11.0 nom 2.0 nom . 8.0 nom
Nickel, nom 10.0 20.0 22.0 18.0 19.0 14.0 25.0
Copper 18.0 nom . . . . . .
Aluminum . . . . . 5.0 nom .
Cobalt . . . . . . .
Iron 1.0 max balance balance balance balance balance balance
Alloy Description T-50 T-45 T-42 T-40 T-39 T-36 T-99
Carbon, max 0.15 max 0.15 0.15 0.15 0.15 0.15 0.15
Manganese, max 0.60 max 0.60 0.60 0.60 0.60 0.60 0.35
Silicon, max 0.40 0.40 0.40 0.40 0.40 0.40 0.35
Phosphorus, max 0.025 0.025 0.025 0.025 0.025 0.025 0.015
Sulfur, max 0.025 0.025 0.025 0.025 0.025 0.025 0.010
Chromium, max 0.50 max 0.50 0.50 0.50 0.50 0.25 0.50
Nickel, nom 50.0 nom 45.0 42.0 40.0 39.0 36.0 99.5
Copper . . . . . . 0.25 max
Aluminum . . . . . . .
Cobalt, max 0.50 max 0.50 0.50 0.50 0.50 0.50 0.50
Iron balance balance balance balance balance balance 0.40 max
Alloy Description T-38 T-19A T-00
Carbon, max 0.12 max 0.15 max .
Manganese, max 0.75 max 1.0 max .
Silicon, max 0.30 max 0.3 max .
Phosphorus, max 0.025 max 0.025 max .
Sulfur, max 0.025 max 0.025 max .
Chromium, max 7.0–7.5 7 nom .
Nickel, nom 38 nom 19 nom .
Copper . . 94 min
Aluminum . . .
Cobalt, max 0.5 max . .
Iron balance balance .
−6 A
TABLE 2 Linear Expansion Coefficients For Thermostat Alloys Values Shown Are 10 /°F From 77°F (25°C) To Temperatures Indicated
Alloy 200°F 300°F 500°F 700°F
C
Anneal Temperature °F (°C)
B
Description (93°C) (149°C) (260°C) (371°C)
T-10 15.1 15.4 (±4 %) 15.6 16.6 1450 (788)
T-20 10.9 11.1 (±1–4 %) 11.4 11.5 1600 (871)
T-22 10.7 10.75 (±4.5 %) 10.9 10.9 1600 (871)
T-18 10.0 10.0 (±4 %) 10.2 10.4 2000 (1093)
T-19 11.1 10.8 (±4 %) 11.2 11.2 1900 (1038)
T-14 9.8 10.4 (±4 %) 10.7 10.9 2000 (1093)
T-2
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