1、Designation: A 902 06aStandard TerminologyRelating to Metallic Coated Steel Products1This standard is issued under the fixed designation A 902; 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
2、parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This standard is a compilation of terminology related tometallic coatings used in the steel industry, and to the steel onwhich the coatings are
3、 applied. Terms that are generallyunderstood or adequately defined in other readily availablesources are not included.1.2 When a term is used in an ASTM document for whichCommittee A05 is responsible it is included herein only whenjudged, after review by Subcommittee A05.18, to be a gener-ally usabl
4、e term.1.3 Definitions that are identical to those published by otherASTM committees or other standards organizations are iden-tified with the ASTM standard designation (for example,Terminology B 374) or with the abbreviation of the name ofthe organization.1.4 A definition is a single sentence with
5、additional infor-mation included in notes. The year the definition was adopted,or the year of latest revision, is appended. The responsiblesubcommittee reviews the definition for each term at five-yearintervals, and prepares revisions as needed.2. Referenced Documents2.1 ASTM Standards:2A 641/A 641M
6、 Specification for ZincCoated (Galvanized)Carbon Steel WireB 374 Terminology Relating to ElectroplatingD 2092 Guide for Preparation of Zinc-Coated (Galvanized)Steel Surfaces for Painting3. Terminology3.1 Definitions:aluminized coating, na coating on steel consisting of eithercommercially-pure alumin
7、um (Type 2) or aluminum-siliconalloy (Type 1), applied by the hot-dip process. (2005)barb, nas related to barbed wire, a short length of wire, withexposed ends cut on a bias to produce sharp points. (1995)barbed wire, na fabricated wire product consisting of twoline wires twisted to form a two-wire
8、strand, into which2-point or 4-point barbs are tightly wrapped and locked intoplace at specified intervals. (1995)base metal, nas related to metallic-coated steel, the steel towhich the coating is applied, as distinguished from thecoating metal. (1990)batch coating, nof metallic coated steel product
9、s, theprocess of discontinuous-sequential passage of steel articlesthrough the various steps of the coating process, such as,cleaning, pickling, fluxing, and coating. (1995)breaking strength, n as related to wire, the maximum forcedeveloped prior to fracture during tension testing of wire andwire pr
10、oducts.DISCUSSIONIn testing of stranded wire products, the maximumforce may be developed after fracture of one or more individual wires.(1993)carbon steel, nsteel having a maximum carbon content of2.0 % and a composition conforming to the following: (1)nominimum content is specified for chromium, co
11、balt, colum-bium (niobium), molybdenum, nickel, titanium, tungsten,vanadium, zirconium, or any other element added to obtaina desired alloying effect; (2) the specified minimum andmaximum values for copper do not exceed 0.35 % and0.60 %, respectively; (3) the specified maximum for any ofthe followin
12、g elements does not exceed these percentages:manganese 1.65 %, silicon 0.60 %, columbium (niobium)0.015 %, vanadium 0.008 %, boron 0.0008 %, or titanium0.025 %; and (4) the incidental content of the following1This terminology is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and
13、 Steel Products and is the direct responsibility ofSubcommittee A05.18 on Editorial and Terminology.Current edition approved Dec. 1, 2006. Published January 2007. Originallyapproved in 1990. Last previous edition approved in 2006 as A 902 - 06.2For referenced ASTM standards, visit the ASTM website,
14、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 appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Driv
15、e, PO Box C700, West Conshohocken, PA 19428-2959, United States.elements does not exceed these percentages: nickel, 0.20 %;chromium, 0.15 %; and molybdenum, 0.06 %.DISCUSSIONCarbon steels typically contain small quantities ofcertain residual elements from the feed materials. When the quantity ofsuch
16、 retained elements exceeds the values listed in (4) above, thecharacteristics of the steel may differ from that of carbon steel withoutthose elements to a degree that the steel may be unsatisfactory for theintended use. The composition limits stated in this definition shall notapply to stabilized st
17、eel. (2005)chemical treatment, na passivating treatment normallyapplied to metallic coatings to retard the formation ofcorrosion products (storage stain) during shipment andstorage.DISCUSSIONThe inhibiting characteristics of the treatment arelimited and if a lot becomes wet in shipment or storage, t
18、he productshould be used or dried immediately. Chemical treatment may beundesirable because of further processing, such as phosphatizing orpainting. (1991)continuous coating, nof metallic coated steel products, theprocess of uninterrupted passage of long lengths of steelproducts, usually steel sheet
19、, tube, pipe, or wire, through thevarious processing steps such as cleaning, annealing, andcoating.DISCUSSIONContinuous coating involves the use of equipment thatis capable of joining long lengths of product without stoppage of thecoating process. Continuous coating of preformed tube or pipe islimit
20、ed to the outer surface, since the coating material cannot besupplied to the inner surface. (2006)delamination, nas related to metallic coated steel, theseparation of a coating (either full or partial thickness) fromunderlying layers; the separation can occur in small localizedareas or large areas o
21、f surface.DISCUSSIONFlaking, peeling, and spalling are colloquial termssometimes used to describe the separation. (1997)differentially coated sheet, nmetallic coated sheet withspecified difference in weight (mass) of metallic coating oneach of the two surfaces. (2006)electrolytic process, nthe appli
22、cation of a metallic coatingon a steel product by passing an electric current through achemical solution in which the product is immersed; thecoating may be applied in a continuous process or a batchprocess. (1995)embrittlement, nthe loss or partial loss of ductility in asteel, such that failure is
23、characteristically by fracturewithout appreciable deformation. (1990)extra smooth sheet, nproduct produced by cold rolling themetallic coated sheet with a small reduction in thickness tosmooth the surface and impart resistance to stretcher strainsand fluting. (Syn. skin passed sheet)DISCUSSIONExtra
24、smooth is frequently specified when fluting orstretcher strains may be a hazard. Extra smooth may not be available inall coating types or weights (masses). (2006)fabricator, nas related to corrugated metal pipe,(1) theorganization that produces the finished pipe, or (2) forstructural plate pipe, the
25、 organization that processes flatsheets and other items needed for the field assembly of thefinished products. (1990)flakingSee delamination. (1994)galvanized coating, na coating of virtually pure zinc onsteel, applied by various methods or processes includinghot-dip process and electrodeposition (e
26、lectrolytic process).DISCUSSIONFor hot-dipped galvanized coatings, the molten bath istypically at least 99 % zinc; as applied to the steel, the coating typicallycontains intermetallic layers of zinc-iron alloys adjacent to the steelsurface. Other methods of applying the zinc coating include metalspr
27、aying (metallizing), sherardizing, vacuum deposition, and mechani-cal deposition, but there is not general agreement that all produce a“galvanized coating”. There is general agreement that the coatingproduced by application of zinc-rich paint is not a “galvanizedcoating”. (1999)galvannealed coating,
28、 na coating on steel of zinc-basedalloy, containing about 6 to 15 % iron, produced by hot-dipimmersion in a high-zinc content coating bath, followed byheating the steel to induce diffusion alloying between themolten zinc coating and the steel. (1994)heat, na specific lot of material representing a s
29、ingle melt ofsteel produced to a specified chemical analysis. (1991)heat analysis, nthe chemical composition of a specificproduction lot of liquid steel. (2003)DISCUSSIONThe sample on which the analysis is performed isusually taken from the molten steel.hot-dip process, nthe application of a metalli
30、c coating on asteel product by immersion of the product in the moltenmetal which forms the coating; the coating is applied ineither a continuous process or a batch process. (2006)DISCUSSIONMetallic coatings applied by the hot-dip process arecharacterized by the presence of an intermediate alloy laye
31、r whichforms as a result of a metallurgical reaction between the steel surfaceand the molten metal.lot, na finite quantity of a given product, produced underconditions that are considered uniform for sampling pur-poses.DISCUSSIONIn the case of metallic-coated iron or steel products, theconditions wh
32、ich may be considered necessary for a single lot aresimilar units, coating at approximately the same time, in the samemanner, in a single coating bath. Consideration must also be given tothe uniformity of the iron or steel product to which the coating isapplied, such as being from a single heat. For
33、 material sampled aftershipment from the manufacturers or coaters facility (where the heat orprocessing identification may have been lost), a lot would consist of allsimilar material in a given shipment. (2006)manufacturer, nas related to corrugated metal pipe, theorganization that produces the meta
34、l sheet from which pipeis made. (1990)mechanical polishing, nof metallic coatings, the looseningand detachment of superficial, small particles of coatingmetal during processing or testing, due to mechanicalabrasion. (1994)A 902 06a2minimum thickness, nof steel sheet, an ordering designa-tion which i
35、ndicates that the applicable tolerance for thick-ness is all plus from the ordered thickness.DISCUSSIONAs an example, the thickness tolerance for sheet mate-rial ordered as 0.035 in. minimum is +0.008 in., 0.000 in., and theallowable range of thickness is 0.035 in. to 0.043 in. or ordered as 1.32mm
36、minimum is +0.26 mm, 0.00 mm, and the allowable range ofthickness is 1.32 mm to 1.58 mm. The total thickness tolerance forsheet ordered to minimum thickness is usually twice the tabulartolerance for sheet ordered to nominal thickness. (1997)nominal thickness, nof steel sheet, an ordering designation
37、which indicates that the applicable tolerance for thickness isboth plus and minus from the ordered thickness.DISCUSSIONAs an example, the thickness tolerance for sheet mate-rial ordered as 0.035 in. nominal is +0.004 in., 0.004 in., and theallowable range of thickness is 0.031 in. to 0.039 in. or or
38、dered as 1.32mm nominal is +0.13 mm, 0.13 mm, and the allowable range ofthickness is 1.19 mm to 1.45 mm. In some cases, the purchaser mayspecify the tolerances unequally, such as +0.006 in., 0.002 in. or+0.20 mm, 0.06 mm. The total tolerance is always the same, whetherindicated equally or unequally,
39、 plus and minus. (2003)oiled, adjdescribing a coating applied to metallic coatedsteel sheet alone or in addition to chemical treatment forfurther protection against the onset of storage corrosion; theoil coating is intended as a corrosion inhibitor only and notas a rolling or drawing lubricant. (200
40、1)peelingSee delamination. (1994)phosphatized, adjpertains to chemical treatment, in a phos-phate solution, of uncoated and metallic coated sheet toprepare the surface for painting without further treatmentexcept normal cleaning. (Syn. phosphated, phosphatecoated)DISCUSSIONThis is a surface treatmen
41、t only and other characteris-tics of the metallic coating remain unchanged on phosphatized sheet.Cleaning procedures are described in Practice D 2092. (1993)powdering, nas related to metallic coatings, microcrackingand fine particle separation of generally brittle coatings whenthe coating is severel
42、y stressed. (2005)product analysis, na chemical analysis of the semifinishedor finished steel. (1993)purchaser, nas related to corrugated metal pipe, the personor agency that purchases the finished pipe. (1990)sample, na portion of the material in a lot, selected accord-ing to a specific sampling pl
43、an, intended to represent the lot.DISCUSSIONThe sample may consist of one or more discrete units,or may be one or more portions selected from one or more large units(such as from a coil of wire or steel sheet). (1994)seam, nin wire, a longitudinal discontinuity that extendsradially into the wire fro
44、m its surface.DISCUSSIONThe discontinuity may appear as a crack. The discon-tinuity can develop during solidification, rolling, or the wire drawingoperation as a result of dynamic strain aging.Aseam originating in wiredrawing is also known as a split. (1992)skin passed sheet, nSynonym for extra smoo
45、th sheet.(1991)spallingSee delamination. (1997)spangle, nin hot-dip coatings, the crystalline structure thatdevelops on a metallic-coated surface when the moltencoating metal solidifies, especially on steel sheet and articlescoated after fabrication.DISCUSSIONThe crystalline structure can range from
46、 large, veryvisible dendritic grains to small, equiaxed grains that are difficult todiscern with the unaided eye. Variables that affect the crystal size andvisibility include: steel substrate composition and prior treatment,coating bath composition, coating solidification rate and post coatingproces
47、sing such as temper rolling. (2005)specimen, na portion of a sample on which a specific test orevaluation is performed. (2005)stabilized steel, na steel which has been treated with one ormore carbide- or nitride-forming elements such as titanium,vanadium, or columbium, to control the level of inters
48、titialsolute elements (carbon or nitrogen) in the steel. (2001)DISCUSSIONStabilized steel has improved formability as comparedto steel that has not been stabilized.Also, stabilized steels are non-agingstrandSee wire strand. (1995)steel sheet designation, na title given to a steel sheetproduct, assoc
49、iated with unique requirements for chemicalcomposition and with mandatory or nonmandatory (typical)mechanical properties; the specific titles include commercialsteel, drawing steel, deep drawing steel, extra deep drawingsteel, forming steel, high strength-low alloy steel, hightemperature steel, structural steel, bake hardenable steel,and solution hardened steel.DISCUSSIONThese designations are abbreviated as CS, DS, DDS,EDDS, FS, HSLAS, HTS, SS, BHS, and SHS, respectively. DesignationsHSLAS, SS, BHS, and SHS have
