1、Designation: A424/A424M 09aStandard 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 Department of Defense.1. Scope*1.1 This specification covers sheet steel in coils and c
3、utlengths 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 twodesigna
4、tions, 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
5、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-
6、ness and width of the product ordered.2. Referenced Documents2.1 ASTM Standards:2A568/A568M Specification for Steel, Sheet, Carbon, Struc-tural, and High-Strength, Low-Alloy, Hot-Rolled andCold-Rolled, General Requirements forA635/A635M Specification for Steel, Sheet and Strip,Heavy-Thickness Coils,
7、 Hot-Rolled, Alloy, Carbon, Struc-tural, High-Strength Low-Alloy, and High-Strength Low-Alloy with Improved Formability, General RequirementsforA941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and Ferroalloys3. Terminology3.1 DefinitionsFor definitions of other terms used in thi
8、sspecification, refer to Terminology A941.3.2 Definitions of Terms Specific to This Standard:3.3 base coatalso known as ground coat. This coatinglayer is applied directly to the steel and promotes adhesion ofthe coating system to the steel.3.4 cover coatThis coating layer is usually applied overthe
9、base or ground coat to improve the appearance and providethe proper color.3.5 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 decarbu
10、rization. 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 st
11、eel 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 emplo
12、yed. 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 bend-ing, moderate forming, or moderate drawing may be involved.4.2.2 Drawing Steel is intended
13、 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 juri
14、sdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.19 on Steel Sheet and Strip.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1958. Last previous edition approved in 2009 as A424 09. DO
15、I:10.1520/A0424_A0424M-09a.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.1*A Summary of Changes section app
16、ears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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
17、 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 without theneed of prior roller leveling.4.3 Porcelain
18、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 drypowders or wet slips. This type enamel is suitable for
19、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 preparation. They may also be applied over fired groundcoat en
20、amels. 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, or III). Both the base coat (adherence promoting enam
21、el)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 desired material:5.1.1 Quantity,5.1.2 ASTM specifica
22、tion 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 practice (for Type I, indicate if direct covercoat p
23、ractice 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/A568M. Thepurchaser should contact the producer regar
24、ding 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) (see 10.1), and5.1.11 Special requirements (if any)
25、.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 ordering description is as follows: 40 000 lb, ASTMA424 -NN
26、 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, Part 2587,Range Top.”6. General Requirements for De
27、livery6.1 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 decimal thickness tolerancesapply or to metric thickness
28、 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 TestCommercial Steel sheet shall be capable ofbeing bent a
29、t 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. Workmanship, Finish, and Appearance9.1 Surface FinishU
30、nless otherwise specified, the sheetshall have a matte (dull) finish suitable for porcelain enamel-ing.9.2 OilingUnless otherwise specified, the sheet shall beoiled.10. Certification10.1 When requested, the manufacturer shall furnish theresults of the heat analysis made to determine compliance witht
31、his 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; porcelainTABLE 1 Chemical CompositionAElem
32、entComposition, max, percentType I Type II Type IIICarbon 0.008B0.05 0.02Manganese 0.40 0.50 0.35Phosphorus 0.020 0.020 0.020Sulfur 0.030 0.030 0.030OtherCDAWhere aluminum is used as the deoxidizing agent, the aluminum content totalby product analysis is usually in excess of 0.010 %.BHeat analysis o
33、f carbon is not appropriate for Type I. Sheet product analysis isappropriate for checking proper type of material.CMicroalloy additions are permitted to meet special customer requirements.DColumbium or titanium additions, or both, are made to combine with carbonand nitrogen to produce an interstitia
34、l-free steel.A424/A424M 09a2SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue (A424 09)that may impact the use of this standard. (Approved November 1, 2009.)(1) Section 5.1.7.1 deleted(2) Reversed order of 5.1.10 and 5.1.11 and adde
35、d newSection 5.1.11.1.Committee A01 has identified the location of selected changes to this standard since the last issue (A424 06)that may impact the use of this standard. (Approved April 1, 2009.)(1) Sections 1.2 and 1.3 added to make this a dual standard.(2) Note 2metric ordering example added.(3
36、) Section 6.2 modified to allow for metric thickness ordering(4) Standards designation changed to recognize dualstandard.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expres
37、sly 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 revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,
38、 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 comments will receive careful consideration at a meeting of theresponsible technical committee, which you may at
39、tend. 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 copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States.
40、 Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A424/A424M 09a3
