1、Designation: A424/A424M 18Standard 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
2、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 a
3、nd 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 twodes
4、ignations, 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, eachsys
5、tem 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 th
6、ick-ness and width of the product ordered.1.4 This international standard was developed in accor-dance 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 Wor
7、ld Trade Organization TechnicalBarriers to Trade (TBT) Committee.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 Str
8、ip,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 o
9、ther 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 i
10、s 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 levelac
11、hieved 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 good
12、formability.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 ena
13、meling 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:1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is
14、the direct responsibility of SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved July 1, 2018. Published August 2018. Originallyapproved in 1958. Last previous edition approved in 2016 as A424/A424M 09a (2016). DOI: 10.1520/A0424_A0424M-18.2For referenced ASTM standards, visit the A
15、STM 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
16、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommen
17、dations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.2.1 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
18、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 ofsuch surface disturbances as stretcher strains or fluting withoutthe need of prior roller leveling.4.
19、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
20、hout theneed of prior roller leveling.4.3 Porcelain Enamels:4.3.1 Ground coat enamels are glasses used primarily fortheir bonding characteristics. They may be applied after propermetal preparation (either pickle or pickle-free depending onenamel system). These glasses may be applied as either drypow
21、ders or wet slips. This type enamel is suitable for all threetypes of steel (Type I, II, or III).4.3.2 Cover coat enamels are appearance glasses applied forspecific color, corrosion, alkali resistance, and so forth. Theseenamels may be applied directly to Type I steels after suitablemetal preparatio
22、n. They may also be applied over fired groundcoat enamels. They may be applied as either dry powder or wetslip.4.3.3 Two coat-one fire enamels are special glass systemsapplied as dry powders. They usually are applied as pickle-freesystems. They are suitable for all three types of steel (Type I,II, o
23、r III). Both the base coat (adherence promoting enamel)and the cover coat (color or other specific properties) areapplied and fired at the same time.5. Ordering Information5.1 Orders for material under this specification shall includethe following information, as required, to describe adequatelythe
24、desired material:5.1.1 Quantity,5.1.2 ASTM specification number and date of issue,5.1.3 Name of material (Porcelain Enameling Sheet, Type I,Drawing Steel),5.1.4 Condition (oiled unless otherwise specified),5.1.5 Finish (matte (dull) finish will be supplied unlessotherwise specified),5.1.6 Enameling
25、practice (for Type I, indicate if direct covercoat practice will be used), and5.1.7 Dimensions (thickness, width, and length for cutlengths, or thickness and width of coils).NOTE 1Not all producers are capable of meeting all of the limitationsof the thickness tolerance tables in Specification A568/A
26、568M. Thepurchaser should contact the producer regarding possible limitations priorto placing an order.5.1.8 Coil size and weight requirements (must includeinside and outside diameters and maximum weight),5.1.9 Application (show part identification and description),5.1.10 Heat analysis (if required)
27、 (see 10.1), and5.1.11 Special requirements (if any).5.1.11.1 When the purchaser requires thickness tolerancesfor38 in. 10 mm minimum edge distance (see SupplementaryRequirement in Specification A568/A568M), this requirementshall be specified in the purchase order or contract.NOTE 2A typical orderin
28、g description is as follows: 40 000 lb, ASTMA424 -NN Porcelain Enameling Sheet, Type I, Drawing Steel, directcover coat, 0.048 in. by 35 in. by 96 in., Part 2587, Range Top, or, 50 000kg, ASTM A424M -NN Porcelain Enameling Sheet, Type I, DrawingSteel, direct cover coat, 1.22 mm by 890 mm by 2440 mm,
29、 Part 2587,Range Top.”6. General Requirements for Delivery6.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A568/A568M.6.2 Products covered by this specification are produced onlyto either decimal thickness where deci
30、mal thickness tolerancesapply or to metric thickness where metric thickness tolerancesapply.7. Chemical Composition7.1 The heat analysis of Type I, Type II, and Type III shallconform to the requirements prescribed in Table 1 except forcarbon in Type I as noted.8. Mechanical Properties8.1 Bend TestCo
31、mmercial Steel sheet shall be capable ofbeing bent at room temperature in any direction through 180flat on itself without cracking on the outside of the bentportion.8.2 FormabilityDrawing Steel and Type III sheet shallproduce an identified part within a properly established break-age allowance.9. Wo
32、rkmanship, Finish, and Appearance9.1 Surface FinishUnless otherwise specified, the sheetshall have a matte (dull) finish suitable for porcelain enamel-ing.TABLE 1 Chemical CompositionAElementComposition, max, percentType I Type II Type IIICarbon 0.008B0.05 0.02Manganese 0.40 0.50 0.35Phosphorus 0.02
33、0 0.020 0.020Sulfur 0.030 0.030 0.040OtherCDAWhere aluminum is used as the deoxidizing agent, the aluminum content total byproduct analysis is usually in excess of 0.010 %.BHeat analysis of carbon is not appropriate for Type I. Sheet product analysis isappropriate for checking proper type of materia
34、l.CMicroalloy additions are permitted to meet special customer requirements.DNiobium (formerly known as columbium) or titanium additions, or both, are madeto combine with carbon and nitrogen to produce an interstitial-free steel. Forstraight titanium stabilized grades, Ti is greater than (4C + 3.42N
35、 + 1.5S). For dualstabilized grades of titanium and niobium, Nb is greater than 7.74C and Ti isgreater than (3.42N +1.5S).A424/A424M 1829.2 OilingUnless otherwise specified, the sheet shall beoiled.10. Certification10.1 When requested, the manufacturer shall furnish theresults of the heat analysis m
36、ade to determine compliance withthis specification and shall include the purchase order number,ASTM designation number, and heat number correlating theresults with the material represented.11. Keywords11.1 commercial steel; decarburization; drawing steel;enameling; interstitial free steel; porcelain
37、SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A424/A424M 09a (2016) that may impact the use of this standard. (Approved July 1, 2018.)(1) Revised Sulphur maximum.ASTM International takes no position respecting the validity of an
38、y patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to rev
39、ision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your
40、 comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyr
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