ASTM_B_753_-_07_2013.pdf

Designation:B75307(Reapproved 2013)Standard Specification forThermostat Component Alloys1This standard is issued under the fixed designation B753;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A 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 describes requirements for alloys tobe used as components in the manufacture of bonded multi-component thermostat metal strip.More specifically it de-scribes alloys having composition,and thermal expansionsuitable for application in thermostat metal sheet and strip.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions 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 identified in the appropriateMaterial Safety Data Sheet(MSDS)for this product/materialas provided by the manufacturer,to establish appropriatesafety and health practices,and determine the applicability ofregulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet,and StripB63 Test Method for Resistivity of Metallically ConductingResistance and Contact MaterialsB152/B152M Specification for Copper Sheet,Strip,Plate,and Rolled BarB162 Specification for Nickel Plate,Sheet,and StripB388 Specification for Thermostat Metal Sheet and StripE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod Dilatometer3.Ordering Information3.1 Orders for this material under this specification shallinclude the following information:3.1.1 Alloy type,3.1.2 Size,3.1.3 Surface finish,3.1.4 Marking and packaging,and3.1.5 Certification,if required.4.General Requirements4.1 The material shall be free of scale,slivers,cracks,seams,corrosion and other defects as best commercial practicewill permit.Surfaces shall be uniform and sufficiently clean sothat commonly used methods of surface preparation,or pre-bond cleaning will allow bonding of the entire mating surfaces.Since surface condition can vary for different alloys andbecause bonding practices vary,product surface condition canbe agreed upon between supplier and purchaser.5.Chemical Composition5.1 The material shall be manufactured to the chemicalcompositions shown in Table 1.5.2 The manufacturer will insure uniformity of compositionthroughout a heat lot to provide uniform thermal expansion andelectrical resistivity properties.See Specifications B152/B152M and B162.6.Thermal Expansion Requirements6.1 Samples tested in accordance with 6.2 shall exhibitthermal expansion properties described in Table 2.6.2 One test sample representing each heat lot shall bemachined to a suitable specimen configuration,heat treated inaccordance with instructions in Table 2 and Test Method E228.7.Electrical Resistivity7.1 The electrical resistivity measured at room temperatureas in Test Method B63 on suitably prepared and annealedspecimens shall conform to Table 3.8.Temper8.1 This product will be supplied in the condition agreedupon by purchaser and seller.1This specification is under the jurisdiction 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 May 1,2013.Published May 2013.Originallyapproved in 1986.Last previous edition approved in 2007 as B753 07.DOI:10.1520/B0753-07R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.2 Hardness shall be measured on representative samplesfrom each heat treat lot and reported as Rockwell B hardness.8.3 Hardness values in the annealed condition shall conformto the requirements in Table 4 tested as in Test Methods E18.TABLE 1 Suggested Compositions For Thermostat Alloys All Elements Indicated As Weight PercentNOTE1Composition requirements show major elements as being nominal.These nominal requirements indicate they are to be adjusted by themanufacturer so that the alloys meet the requirements for thermal expansion shown in Table 2.Other elements not shown,may be present in residualamounts.These shall not be present in sufficient quantity as to significantly affect the performance in the