1、Designation: B388 06 (Reapproved 2018)Standard Specification forThermostat Metal Sheet and Strip1This standard is issued under the fixed designation B388; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers thermostat metals in the formof sheet or strip that are used for the temperature-sensitiveelements of device
3、s for controlling, compensating, or indicat-ing temperature and is intended to supply acceptance require-ments to purchasers ordering this material by type designation.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions
4、 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 its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identif
5、ied in the appropriateSafety Data Sheet (SDS) for this product/material as providedby the manufacturer, to establish appropriate safety, health,and environmental practices, and determine the applicabilityof regulatory limitations prior to use.1.4 This international standard was developed in accor-da
6、nce with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM St
7、andards:2B63 Test Method for Resistivity of Metallically ConductingResistance and Contact MaterialsB106 Test Methods for Flexivity of Thermostat MetalsB223 Test Method for Modulus of Elasticity of ThermostatMetals (Cantilever Beam Method)B362 Test Method for Mechanical Torque Rate of SpiralCoils of
8、Thermostat MetalB389 Test Method for Thermal Deflection Rate of Spiral andHelical Coils of Thermostat MetalB478 Test Method for Cross Curvature of Thermostat MetalsB753 Specification for Thermostat Component AlloysC351 Test Method for Mean Specific Heat of ThermalInsulation (Withdrawn 2008)3E92 Test
9、 Methods for Vickers Hardness and Knoop Hard-ness of Metallic MaterialsE384 Test Method for Microindentation Hardness of Mate-rials3. Terminology3.1 Definitions:3.1.1 thermostat metal, na composite material comprisingtwo or more metallic layers of differing coefficients of thermalexpansion such that
10、 the radius of curvature of the compositechanges with temperature change.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Type designation (Table 1 and Table 2),4.1.2 Thickness (see 9.1),4.1.3 Width (see 9.2),4.1.4 Temper (designate
11、d as percent cold reduction asneeded),4.1.5 Marking to identify vendor, type, high-expansion sideor low-expansion side,4.1.6 Weight.5. Material Segregation5.1 The thermostat metal shall be supplied segregated intotwo groups after slitting: (1) the burr on the low-expansivecomponent, and (2) the burr
12、 on the high-expansive component.These two groups shall be identified and packaged separatelyor together as mutually agreed upon between the producer andthe user.6. Chemical Composition6.1 The nominal composition of component materials isgiven in Table 1.1This specification is under the jurisdiction
13、 of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.10 on Thermostat Metals and Electrical Resistance Heating Materials.Current edition approved April 1, 2018. Published April 2018. Originallyapproved in 1962. Last previous edition approved in 20
14、12 as B388 06 (2012).DOI: 10.1520/B0388-06R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last appro
15、ved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization
16、established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1TABLE 1 CompositionNOTE 1TM6 and TM7 are no longer manufactured due to availability, difficulty to p
17、roduce, commercial interest, or combinations thereof.ASTM TypeElement TM1 TM2 TM3 TM4 TM5 TM8 TM9Nominal chemical high-expansive nickel 22 10 25 25 25 10 22composition, component chromium 3 . 8.5 8.5 8.5 . 3weight,% manganese . 72 . . . 72 .copper . 18 . . . 18 .iron 75 . 66.5 66.5 66.5 . 75aluminum
18、 . . . . . . .carbon . . . . . . .intermediatecomponentnickelmanganese.100.low-expansivecomponentnickelironcobalt3664.3664.4258.4555.5050.3664.3664.Component ratio,thickness, %high-expansivecomponent50 53 50 50 50 80 27intermediatecomponent. . . . . . 46low-expansivecomponent50 47 50 50 50 20 27ASTM
19、 TypeElement TM10 TM11 TM12 TM13 TM14 TM15 TM16Nominal chemical high-expansive nickel 22 22 22 22 22 22 22composition, component chromium 3 3 3 3 3 3 3weight,% manganese . . . . . . .copper . . . . . . .iron 75757575757575aluminum . . . . . . .carbon . . . . . . .intermediatecomponentnickelmanganese
20、100.100.100.100.100.100.100.low-expansivecomponentnickelironcobalt3664.3664.3664.3664.3664.3664.3664.Component ratio,thickness, %high-expansivecomponent34 36 40 42 44 47 48intermediatecomponent32 28 20 16 12 6 4low-expansivecomponent34 36 40 42 44 47 48ElementASTM TypeTM17 TM18 TM19 TM20 TM21 TM22 T
21、M23Nominal chemical high-expansive nickel 22 19.4 19.4 18 18 100 10composition, component chromium 3 2.25 2.25 11.5 11.5 . .weight,% manganese . . . . . . 72copper . . . . . . 18iron 75 78.3 78.3 70.5 70.5 . .aluminum . . . . . . .carbon . 0.5 0.5 . . . .intermediatecomponentnickelmanganese100.low-e
22、xpansivecomponentnickelironcobalt3664.4258.3961.3664.4258.3664.4258.Component ratio,thickness,%high-expansivecomponent49 50 50 50 50 50 54intermediatecomponent2 . . . . . .low-expansivecomponent49 50 50 50 50 50 46ASTM TypeElement TM24 TM25 TM26 TM27 TM28 TM29 TM30Nominal chemical high-expansive nic
23、kel 22 22 22 22 22 20 22composition, component chromium 3 3 3 3 3 . 3weight, % manganese . . . . . 6.5 .copper . . . . . . .iron 75 75 75 75 75 73.5 75aluminum . . . . . . .carbon . . . . . . .intermediatecomponentcoppermanganese100.100.100.100.100.B388 06 (2018)26.1.1 The component alloys shall be
24、as specified in Speci-fication B753.7. Component Ratio7.1 The typical thickness ratio of the component materials isgiven in Table 1. The component thickness ratios are given forreference as they are lot-to-lot variable to produce requiredflexivity and resistivity. Barrier(s) layer(s) for stability o
25、fresistivity is (are) allowable. Flexivity may vary.8. Physical Requirements8.1 Maximum Sensitivity RangeThe temperature ranges ofmaximum thermal response of designated types of thermostatmetals are given in Table 2 and Table 3. These are nominalvalues presented only to aid users in designing device
26、s.8.2 Maximum Recommended TemperatureThe maximumrecommended temperatures of use of designated types ofthermostat metals are given in Table 2 and Table 3. Thesevalues are presented to aid users in designing devices.8.3 FlexivityThe flexivity of a designated thermostatmetal shall conform to the values
27、 in Table 2 and Table 3.Component materials designated in Specification B753 shall,in thermostat metal combinations, yield product in confor-mance with the values designated in Table 2 and Table 3.8.3.1 Flexivity shall be determined by Test Methods B106,Method A.8.3.2 Residual stress loading can aff
28、ect flexivity test results.Specimens shall be stabilized prior to testing by stress relief for1 h at 500F (260C). Suitable stress relief conditions must bedetermined for individual end use applications. Initial condi-tion recommendations are given in Table 2.8.4 Electrical ResistivityThe electrical
29、resistivity shallconform to the values given in Table 2 and Table 3. Componentmaterials designated in Specification B753 shall, in thermostatmetal combinations, yield product in conformance with thevalues designated in Table 2 and Table 3.8.4.1 Electrical resistivity shall be determined by TestMetho
30、d B63 at 75F (24C).8.5 Modulus of ElasticityThe nominal moduli of elasticityof designated thermostat metals at a temperature of 75F(24C) are given in Table 2 and Table 3. These are nominalvalues presented to aid users in designing devices and shall notbe used for rejection or acceptance purposes.TAB
31、LE 1 ContinuedASTM TypeElement TM24 TM25 TM26 TM27 TM28 TM29 TM30low-expansivecomponentnickelironcobalt3664.3664.3664.3664.3664.3664.4258.ASTM TypeTM24 TM25 TM26 TM27 TM28 TM29 TM30Component ratio,thickness, %resistivity ohm cirmil/ft20 30 50 70 90 477 415high-expansivecomponent10 20 31 38 42 50 50i
32、ntermediatecomponent53 35 20 14 10 . .low-expansivecomponent37 45 49 48 48 50 50ASTM TypeElement TM31 TM32 TM33 TM34 TM35 TM36Nominal chemical high-expansive nickel 10 10 10 10 19 25composition, component chromium . . . . 2 8weight, % manganese 72 72 72 72 . .copper 18 18 18 18 . .iron . . . . 79 67
33、aluminum . . . . . .carbon . . . . . .intermediatecomponentcoppermanganese100.100.100.100.low-expansivecomponentnickelironcobalt3664.3664.3664.3664.3664.3664.ASTM TypeTM31 TM32 TM33 TM34 TM35 TM36Component ratio,thickness, %resistivity ohm cirmil/ft30 150 50 70 482 500high-expansivecomponent26 50 42
34、 45 50 50intermediatecomponent38 6 21 15 . .low-expansivecomponent36 44 37 40 50 50B388 06 (2018)38.5.1 Modulus of elasticity shall be determined by TestMethod B223.8.6 Specific HeatThe nominal specific heat of the desig-nated thermostat metals is 0.12 BTU/lbF (500 J/kgK). Thisnominal value is prese
35、nted to aid users in designing devicesand shall not be used for rejection or acceptance purposes.8.6.1 The specific heat shall be determined by Test MethodC351.8.7 DensityThe nominal densities of designated thermo-stat metals are given in Table 2 and Table 3. These are nominalvalues presented to aid
36、 users in designing devices and shall notbe used for rejection or acceptance purposes.TABLE 2 Properties of Thermostat Metals (Inch-Pound Units)NOTE 1TM6 and TM7 are no longer manufactured due to availability, difficulty to produce, commercial interest, or combinations thereof.Properties UnitsASTM T
37、ypeTM1 TM2 TM3 TM4 TM5 TM8 TM9Maximum sensitivitytemperature rangeF 0 to 300 0 to 400 200 to 600 250 to 700 300 to 850 0 to 400 0 to 300Maximum recommendedtemperatureF 1000 500 1000 1000 1000 500 900Flexivity 10650 to 200F 15.0 5 % 21.7 5 % 10.4 6 % 8.6 6 % 6.4 6 % 15.6 8 % 11.5 10 %100 to 300F 14.6
38、 5 % 21.1 5 % 10.6 6 % 9.0 6 % 6.6 6 % 15.6 8 % 11.2 10 %Heat treatment F 700 500 700 700 700 500 700Electrical resistivity at cmil/ft 475 4 % 675 5 % 435 4 % 400 4 % 345 5 % 850 5 % 100 5.5 %75F mil2/ft 3734% 5305% 3424% 3144% 2715% 6685% 785.5%Modulus of elasticity psi 10625 20 25 25 25.5 19.5 26D
39、ensity lb/in.30.29 0.28 0.29 0.29 0.29 0.27 0.31TM10 TM11 TM12 TM13 TM14 TM15 TM16Maximum sensitivitytemperature rangeF 0 to 300 0 to 300 0 to 300 0 to 300 0 to 300 0 to 300 0 to 300Maximum recommendedtemperatureF 900 900 900 900 900 900 900Flexivity 10650 to 200F 13.1 6 % 13.2 6 % 13.7 5.5 % 14.0 5
40、.5 % 14.7 5.5 % 14.8 5.5 % 14.9 5.5 %100 to 300F 12.7 6 % 13.3 6 % 13.7 5.5 % 14.0 5.5 % 14.3 5.5 % 14.4 5.5 % 14.6 5.5 %Heat treatment F 700 700 700 700 700 700 700Electrical resistivity at cmil/ft 125 5.5 % 150 5.5 % 175 5.5 % 200 5.5 % 250 5.5 % 300 5.5 % 350 5.5 %75F mil2/ft 98 5.5 % 118 5.5 % 1
41、37 5.5 % 157 5.5 % 196 5.5 % 236 5.5 % 275 5.5 %Modulus of elasticity psi 10626 26 25.5 25.5 25.5 25 25Density lb/in.30.30 0.30 0.30 0.30 0.30 0.30 0.29TM17 TM18 TM19 TM20 TM21 TM22 TM23Maximum sensitivitytemperature rangeF 0 to 300 200 to 600 150 to 450 0 to 300 200 to 600 0 to 300 200 to 600Maximu
42、m recommendedtemperatureF 900 900 900 900 900 900 500Flexivity 10650 to 200F 15.0 5.5 % 11.9 7 % 14.4 7 % 13.8 5 % 10.7 7 % 10.2 5 % 18.3 5 %100 to 300F 14.6 5.5 % 11.9 7 % 14.1 7 % 13.5 5 % 10.9 7 % 10.2 5 % 18.6 5 %Heat treatment F 700 700 700 700 700 700 500Electrical resistivity at cmil/ft 400 5
43、.5 % 420 4 % 456 5 % 479 4 % 418 4 % 92 6 % 565 4 %75F mil2/ft 3145.5% 3304% 3585% 3764% 3284% 726% 4444%Modulus of elasticity psi 10625 25 25 25 25 26 20Density lb/in.30.29 0.29 0.29 0.29 0.29 0.31 0.28TM24 TM25 TM26 TM27 TM28 TM29 TM30Maximum sensitivitytemperature rangeF 0 to 300 0 to 300 0 to 30
44、0 0 to 300 0 to 300 0 to 300 200 to 600Maximum recommendedtemperatureF 500 500 500 500 500 1000 1000Flexivity 10650 to 200F 13.1 5 % 14.0 5 % 14.7 5 % 14.7 5 % 14.8 5 % 15.8 6 % 11.8 6 %100 to 300F 12.9 5 % 13.6 5 % 14.2 5 % 14. 4 5 % 14.6 5 % 15.6 6 % 12.2 6 %Heat treatment F 500 500 500 500 500 70
45、0 700Electrical resistivity at cmil/ft 20 10 % 30 7.5 % 50 7.5 % 70 7.5 % 90 5 % 477 4 % 415 4 %75F mil2/ft 15.7 10 % 23.6 7.5 % 39.3 7.5 % 55 7.5 % 70.6 5 % 375 4 % 326 4 %Modulus of elasticity psi 10624 24 23 23 22 25 25Density lb/in.30.29 0.29 0.29 0.29 0.29 0.29 0.29TM31 TM32 TM33 TM34 TM35 TM36
46、Maximum sensitivitytemperature rangeF 0 to 300 0 to 300 0 to 300 0 to 300 0 to 300 0 to 300Maximum recommendedtemperatureF 500 500 500 500 900 900Flexivity 10650 to 200F 18.9 5 % 21.7 5 % 20.8 5 % 21.4 5 % 15.2 7 % 13.7 5 %100 to 300F 18.7 5 % 20.8 5 % 20.1 5 % 20.3 5 % 14.9 7 % 13.3 5 %Heat treatme
47、nt F 500 500 500 500 700 700Electrical resistivity at cmil/ft 30 10 % 150 5 % 50 10 % 70 8 % 482 4 % 500 4 %75F mil2/ft 23.6 10 % 117.8 5 % 39.3 10 % 55 378.6 4 % 392.7 4 %Modulus of elasticity psi 10619 19 19 19 25 24Density lb/in.30.30 0.30 0.29 0.29 0.29 0.29B388 06 (2018)48.8 HardnessThe hardnes
48、s of the components of a desig-nated thermostat metal shall conform to those specificationsestablished by the producer and shall be as mutually agreedupon between the producer and the user. In the case of three ormore components, the hardness of the outer components onlyare determined.8.8.1 The hardness shall be determined by Test Method E92,when test loads of 1 kgf (9.8 N) or higher are used. For thinnermaterials requiring the use of test loads less than 1 kgf,hardness shall be determined by Test Method
