ASTM_A_987_-_A_987M_-_09_2014.pdf

Designation:A987/A987M09(Reapproved 2014)Standard Practice forMeasuring Shape Characteristics of Tin Mill Products1This standard is issued under the fixed designation A987/A987M;the number immediately following the designation indicates the yearof 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*1.1 Shape is a significant quality characteristic for tin millproducts.Plate-shape is affected by mill process factors plusthe temper,thickness and width of the material supplied.It isthe purpose of this practice to define accurately the differentplate shape characteristics and to describe the practice(s)mostcommonly used to measure particular characteristics.1.2 Quantitative limits are not addressed and should beestablished on an individual producer and user basis,whereappropriate.1.3 The values stated in either in-pound or SI units are to beregarded as standard.Within the text,the SI units are shown inbrackets.The values stated in each system must be usedindependently of the other.Combining values from the twosystems may result in nonconformance with this specification.1.4 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and to determine the applicability of regula-tory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A599/A599M Specification for Tin Mill Products,Electro-lytic Tin-Coated,Cold-Rolled SheetA623 Specification for Tin Mill Products,General Require-mentsA623M Specification for Tin Mill Products,General Re-quirements MetricA624/A624M Specification for Tin Mill Products,Electro-lytic Tin Plate,Single ReducedA625/A625M Specification for Tin Mill Products,BlackPlate,Single-ReducedA626/A626M Specification for Tin Mill Products,Electro-lytic Tin Plate,Double ReducedA650/A650M Specification for Tin Mill Products,BlackPlate,Double ReducedA657/A657M Specification for Tin Mill Products,BlackPlate Electrolytic Chromium-Coated,Single and DoubleReduced3.Classification3.1 The substrate shall conform to all the requirements ofthe appropriate specifications as follows:Specifications A623,A623M,A599/A599M,A624/A624M,A625/A625M,A626/A626M,A650/A650M,and A657/A657M.4.Significance and Use4.1 The definitions and procedures for measuring shapecharacteristics of tin mill products are provided so that pur-chasers and suppliers have common measuring procedures anddefinitions of shape characteristics.These procedures providedefinitions and measuring techniques of shape characteristics.The intention of these definitions and measuring practices isnot to provide a dimensional specification for shapecharacteristics,but rather common procedure(s)for quantify-ing shape anomalies.5.Interferences5.1 Measurement of shape often has been subjective,at best.Successful measurement of various shape anomalies on quan-titative terms requires recognition of several factors that caninterfere with accurate measurements.5.1.1 Flat surfaces are required.Measurement of severalanomalies require laying of the sample on a flat surface.Amachined flat surface is recommended.Laying a sample on afloor may introduce error due to areas on a floor that are notflat.5.1.2 Several anomalies are measured by hanging the sheet.Hanging by holding the sample with a hand can introduce errorfrom pressures exerted by fingers.A mechanical single deviceclamp to help hold these samples is recommended.5.1.3 Stepblock gauges or tapered gauges should bechecked regularly with a calibrated hand micrometer.Wear ordirt build up could affect accuracy.1This practice is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.20 on Tin Mill Products.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 1998.Last previous edition approved in 2009 as A987-09.DOI:10.1520/A0987_A0987M-09R14.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.4 Computer-based shape measuring instruments must beclean and the sensors must be in good condition.The sheetsample must be damage free.6.Apparatus6.1 Appropriate tools to measure shape anomalies are de-scribed along with drawings(attached)as required.6.1.1 Flat Surfaces Accurate measurements of shapeanomalies require a flat surface,machined flat preferred.6.1.2 Machined Stepblock GaugeSee Fig.1,typically,steps are in116-in.increments.6.1.3 T