ASTM B388-06(2012)
(Specification)Standard Specification for Thermostat Metal Sheet and Strip
Standard Specification for Thermostat Metal Sheet and Strip
ABSTRACT
This specification covers the standard for thermostat metals in the form of sheet or strip proposed for use as temperature-sensitive elements of devices for controlling, compensating, or indicating temperature. Metals shall adhere to physical requirements such as maximum sensitivity range, maximum recommended temperature, flexibility, electrical resistivity, modulus of elasticity, specific heat, density, and hardness.
SCOPE
1.1 This specification covers thermostat metals in the form of sheet or strip that are used for the temperature-sensitive elements of devices for controlling, compensating, or indicating temperature and is intended to supply acceptance requirements to purchasers ordering this material by type designation.
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 Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, 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:B388 −06(Reapproved 2012)
Standard Specification for
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Thermostat Metal Sheet and Strip
This standard is issued under the fixed designation B388; 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.
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1. Scope Insulation (Withdrawn 2008)
E92 Test Method forVickers Hardness of Metallic Materials
1.1 This specification covers thermostat metals in the form
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(Withdrawn 2010)
of sheet or strip that are used for the temperature-sensitive
E384 Test Method for Knoop and Vickers Hardness of
elements of devices for controlling, compensating, or indicat-
Materials
ing temperature and is intended to supply acceptance require-
ments to purchasers ordering this material by type designation.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions:
as standard. The values given in parentheses are mathematical
3.1.1 thermostat metal, n—a composite material comprising
conversions to SI units that are provided for information only
two or more metallic layers of differing coefficients of thermal
and are not considered standard.
expansion such that the radius of curvature of the composite
changes with temperature change.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Ordering Information
responsibility of the user of this standard to become familiar
4.1 Orders for material under this specification shall include
with all hazards including those identified in the appropriate
the following information:
Material Safety Data Sheet (MSDS) for this product/material
4.1.1 Type designation (Table 1 and Table 2),
as provided by the manufacturer, to establish appropriate
4.1.2 Thickness (see 9.1),
safety and health practices, and determine the applicability of
4.1.3 Width (see 9.2),
regulatory limitations prior to use.
4.1.4 Temper (designated as percent cold reduction as
needed),
2. Referenced Documents
2 4.1.5 Marking to identify vendor, type, high-expansion side
2.1 ASTM Standards:
or low-expansion side,
B63 Test Method for Resistivity of Metallically Conducting
4.1.6 Weight.
Resistance and Contact Materials
B106 Test Methods for Flexivity of Thermostat Metals
5. Material Segregation
B223 Test Method for Modulus of Elasticity of Thermostat
5.1 The thermostat metal shall be supplied segregated into
Metals (Cantilever Beam Method)
two groups after slitting: (1) the burr on the low-expansive
B362 Test Method for Mechanical Torque Rate of Spiral
component, and (2) the burr on the high-expansive component.
Coils of Thermostat Metal
These two groups shall be identified and packaged separately
B389 TestMethodforThermalDeflectionRateofSpiraland
or together as mutually agreed upon between the producer and
Helical Coils of Thermostat Metal
the user.
B478 TestMethodforCrossCurvatureofThermostatMetals
B753 Specification for Thermostat Component Alloys 6. Chemical Composition
C351 Test Method for Mean Specific Heat of Thermal
6.1 The nominal composition of component materials is
given in Table 1.
6.1.1 The component alloys shall be as specified in Speci-
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This specification is under the jurisdiction of ASTM Committee B02 on
fication B753.
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
7. Component Ratio
Current edition approved May 1, 2012. Published May 2012. Originally
approved in 1962. Last previous edition approved in 2006 as B388 – 06. DOI:
7.1 Thetypicalthicknessratioofthecomponentmaterialsis
10.1520/B0388-06R12.
given in Table 1. The component thickness ratios are given for
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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
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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B388−06(2012)
TABLE 1 Composition
NOTE 1—TM6 and TM7 are no longer manufactured due to availability, difficulty to produce, commercial interest, or combinations thereof.
ASTM Type
Element TM1 TM2 TM3 TM4 TM5 TM8 TM9
Nominal chemical high-expansive nickel 22 10 25 25 25 10 22
composition, component chromium 3 . 8.5 8.5 8.5 . 3
weight,% manganese . 72 . . . 72 .
copper . 18 . . . 18 .
iron 75 . 66.5 66.5 66.5 . 75
aluminum . . .
...
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