ASTM_A_424_-_A_424M_-_09a_2016.pdf

Designation:A424/A424M09a(Reapproved 2016)Standard Specification forSteel,Sheet,for Porcelain Enameling1This standard is issued under the fixed designation A424/A424M;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers sheet steel in coils and cutlengths for porcelain enameling.The compositions and pro-cessing of these steels are such that articles for porcelainenameling may be fabricated from them and,under properconditions,enameled.The steels are furnished as Type I,TypeII,and Type III.Type I and Type II are supplied in twodesignations,Commercial Steel and Drawing Steel.Type IIIsteel is interstitial-free and does not require a designation.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 Tolerances are found in General Requirements Specifi-cations A568/A568M and A635/A635M.The appropriate Gen-eral Requirements specification is applied based on the thick-ness and width of the product ordered.2.Referenced Documents2.1 ASTM Standards:2A568/A568M Specification for Steel,Sheet,Carbon,Structural,and High-Strength,Low-Alloy,Hot-Rolled andCold-Rolled,General Requirements forA635/A635M Specification for Steel,Sheet and Strip,Heavy-Thickness Coils,Hot-Rolled,Alloy,Carbon,Structural,High-Strength Low-Alloy,and High-StrengthLow-Alloy with Improved Formability,General Require-ments forA941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and Ferroalloys3.Terminology3.1 DefinitionsFor definitions of other terms used in thisspecification,refer to Terminology A941.3.2 Definitions of Terms Specific to This Standard:3.2.1 base coatalso known as ground coat.This coatinglayer is applied directly to the steel and promotes adhesion ofthe coating system to the steel.3.2.2 cover coatThis coating layer is usually applied overthe base or ground coat to improve the appearance and providethe proper color.3.2.3 direct cover coatThis refers to a single coatingapplication that provides both adequate adhesion and appear-ance.4.Classification4.1 Types:4.1.1 Type I steel has an extremely low carbon levelachieved through sheet decarburization.This material is suit-able for direct cover coat enameling practice,but this require-ment must be indicated by the purchaser in accordance with5.1.6.This material is also suitable for ground and cover coatenameling practice.It has good sag resistance and goodformability.4.1.2 Type II steel is suitable for applications where groundand cover coat enameling operations are employed.Thecomposition of the Type II steel is obtained in meltingoperations.4.1.3 Type III is an interstitial-free steel and is suitable forapplications where ground and cover coat enameling opera-tions are employed.The composition of the Type III steel isobtained in melting operations.It has good sag resistance andexcellent formability.4.2 Product Designations:4.2.1 Commercial Steel is intended for parts where bending,moderate forming,or moderate drawing may be involved.4.2.2 Drawing Steel is intended for fabricating identifiedparts where the draw is particularly severe or where thematerial shall be essentially free of changes in mechanicalproperties over a period of time.Drawing Steel should bespecified where the formed material shall be essentially free of1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1958.Last previous edition approved in 2009 as A424/A424M 09a.DOI:10.1520/A0424_A0424M-09AR16.2For 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 such surface disturbances as stretcher strains or fluting withoutthe need of prior roller leveling.4.2.3 Type III interstitial-free steel is intended for fabricat-ing identified parts where the most severe drawing or formingis involved and where the material must be free of changes inmechanical properties over a period of time and free of suchsurface disturbances as stretcher strains or fluting wit