1、Designation: A902 17aStandard TerminologyRelating to Metallic Coated Steel Products1This standard is issued under the fixed designation A902; 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 pa
2、rentheses indicates the year of last reapproval. Asuperscript epsilon () 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 ap
3、plied. 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 usable t
4、erm.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 B374) or with the abbreviation of the name of theorganization.1.4 A definition is a single sentence with addi
5、tional 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.1.5 This international standard was developed in accor-danc
6、e 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 World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Stan
7、dards:2A641/A641M Specification for ZincCoated (Galvanized)Carbon Steel WireA924/A924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip ProcessB374 Terminology Relating to ElectroplatingD6386 Practice for Preparation of Zinc (Hot-Dip Galva-nized) Coated Iron and
8、Steel Product and HardwareSurfaces for PaintingD7396 Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting3. Terminology3.1 Definitions:aluminized coating, na coating on steel consisting of eithercommercially-pure aluminum (Type 2) or aluminum-siliconalloy (Ty
9、pe 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 strand, into which2-point or 4-point bar
10、bs 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 products, theprocess of discontinuous-sequentia
11、l passage of steel articlesthrough the various steps of the coating process, such as,cleaning, pickling, fluxing, and coating. (1995)breaking strength, nas related to wire, the maximum forcedeveloped prior to fracture during tension testing of wire andwire products.DISCUSSIONIn testing of stranded w
12、ire 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, cobalt, colum-bium (niobium), molybdenum, n
13、ickel, 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 following elements does not exceed these percenta
14、ges:manganese 1.65 %, silicon 0.60 %, columbium (niobium)1This terminology is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.18 on Editorial and Terminology.Current edition approved Sept. 1, 2017. Published S
15、eptember 2017. Originallyapproved in 1990. Last previous edition approved in 2017 as A902 - 17. DOI:10.1520/A0902-17A.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 t
16、o 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 StatesThis international standard was developed in accordance with inte
17、rnationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.10.015 %, vanadium 0.008 %, boron 0.0008 %, or t
18、itanium0.025 %; and (4) the incidental content of the followingelements 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
19、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 ste
20、el. (2005)chemical treatment, na passivating surface protectant nor-mally applied to metallic coatings to retard the formation ofcorrosion products during shipment and storage (storagestain).DISCUSSIONThe corrosion-inhibiting characteristics of chemicaltreatments are limited. If chemically-treated m
21、aterial becomes wet inshipment or storage, the product should be used or dried immediately.Some types of chemical treatments may be inappropriate in certainapplications because of possible undesirable effects on furtherprocessing, such as phosphatizing, spot welding, or painting. (2007)commercial st
22、eel, CS, na metallic-coated steel sheet desig-nation which includes carbon steel products intended forgeneral fabrication applications involving little or no bend-ing or forming. (2013)DISCUSSIONThe chemical composition requirements for this desig-nation can be found in the appropriate sheet product
23、 specification.continuous coating, nof metallic coated steel products, theprocess of uninterrupted passage of long lengths of steelproducts, usually steel sheet, tube, pipe, or wire, through thevarious processing steps such as cleaning, annealing, andcoating.DISCUSSIONContinuous coating involves the
24、 use of equipment thatis capable of joining long lengths of product without stoppage of thecoating process. Continuous coating of preformed tube or pipe islimited to the outer surface, since the coating material cannot besupplied to the inner surface. (2006)deep drawing steel, DDS, na metallic coate
25、d steel sheetdesignation which includes low carbon steel products in-tended for applications involving particularly severe formingor deep drawing.DISCUSSIONThe chemical composition requirements for this desig-nation can be found in the appropriate sheet product specification.(2013)delamination, nas
26、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 of surface.DISCUSSIONFlaking, peeling, and spalling are colloquial termssometimes used to describe the separation. (1
27、997)differentially coated sheet, nmetallic coated sheet withunequal specifications for the weight (mass) of metalliccoating on each of the two surfaces. (2012)electrolytic process, nthe application of a metallic coatingon a steel product by passing an electric current through achemical solution in w
28、hich the product is immersed; thecoating may be applied in a continuous process or a batchprocess. (1995)extra deep drawing steel, EDDS, na metallic-coated steelsheet designation, which requires the use of non-aging,chemically-stabilized carbon steel intended for applicationsrequiring maximum formab
29、ility. (2013)DISCUSSIONThe chemical composition requirements for this desig-nation can be found in the appropriate sheet product specification.extra smooth sheet, nproduct produced by cold rolling themetallic coated sheet with a small reduction in thickness toimpart both the desired surface texture
30、and resistance tostretcher strains and fluting. (Syn. skin passed sheet)DISCUSSIONExtra smooth is frequently specified when fluting orstretcher strains may be a hazard. Extra smooth may not be available inall coating types or weights (masses). (2012)fabricator, nas related to corrugated metal pipe,(
31、1) theorganization that produces the finished pipe, or (2 ) forstructural plate pipe, the organization that processes flatsheets and other items needed for the field assembly of thefinished products. (1990)flakingSee delamination. (1994)forming steel, FS, na metallic-coated steel sheet designationwh
32、ich includes carbon steel products intended for applica-tions involving moderate forming or mild drawing whichmight not be achieved by commercial steel. (2013)DISCUSSIONThe chemical composition requirements for this desig-nation can be found in the appropriate sheet product specification.galvanized
33、coating, na coating of virtually pure zinc onsteel, applied by various methods or processes includinghot-dip processes and electrodeposition (electrolytic pro-cesses).DISCUSSIONFor hot-dipped galvanized coatings, the molten bath istypically at least 99 % zinc; as applied to the steel, the coating ty
34、picallycontains intermetallic layers of zinc-iron alloys adjacent to the steelsurface. Other methods of applying the zinc coating include metalspraying (metallizing), sherardizing, vacuum deposition, and mechani-cal deposition, but there is not general agreement that all produce a“galvanized coating
35、.” There is general agreement that the coatingproduced by application of zinc-rich paint is not a “galvanizedcoating.” (1999)galvannealed coating, 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 byhea
36、ting the steel to induce diffusion alloying between themolten zinc coating and the steel. (1994)heat, na specific lot of material representing a single melt ofsteel produced to a specified chemical composition. (2017)heat analysis, nthe chemical composition of a specificproduction lot of liquid stee
37、l. (2003)DISCUSSIONThe sample on which the analysis is performed isusually taken from the molten steel.hot-dip process, nthe application of a metallic coating on asteel product by immersion of the product in the moltenmetal which forms the coating; the coating is applied ineither a continuous proces
38、s or a batch process. (2006)DISCUSSIONMetallic coatings applied by the hot-dip process arecharacterized by the presence of an intermediate alloy layer whichforms as a result of a metallurgical reaction between the steel surfaceand the molten metal.A902 17a2inclusion control, nthe process of reducing
39、 the volumefraction of inclusions or modifying the shape of inclusions toimprove formability, weldability, and machinability.DISCUSSIONInclusions, especially those elongated during the rollingprocess, create the conditions for initiating, and/or propagating crackswhen the material is stretched or be
40、nt during the manufacture of a part.The adverse effects of inclusions are minimized by reducing the contentof inclusions in the steel and/or by altering the shape of inclusionsthrough the use of additions during the steelmaking process that changethe elongated shape of the inclusions to less harmful
41、, small, well-dispersed globular inclusions. (2008)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 which may be considered necessary for a single lot
42、 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 material sampled aftershipment from the manufac
43、turers 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 metal sheet from which pipeis made. (1990)mechanical
44、 polishing, nof metallic coatings, the looseningand detachment of superficial, small particles of coatingmetal during processing or testing, due to mechanicalabrasion. (1994)minimum thickness, nof metallic-coated steel sheet,anordering designation which indicates that the applicabletolerance for thi
45、ckness is all plus from the ordered thickness.(2013)nominal thickness, nof metallic coated steel sheet,anordering designation which indicates that the applicabletolerance for thickness is divided equally, plus and minusfrom the ordered thickness. (2012)oiled, adjdescribing a coating applied to metal
46、lic coated steelsheet alone or in addition to chemical treatment for furtherprotection against the onset of storage corrosion; the oilcoating is intended as a corrosion inhibitor only and not as arolling or drawing lubricant. (2001)peelingSee delamination. (1994)phosphatized, adjpertains to the trea
47、tment, in a phosphatesolution, of uncoated and metallic coated sheet to prepare thesurface for painting without further treatment except normalcleaning. (Syn. phosphated, phosphate coated)DISCUSSIONThis is a surface treatment only and other characteris-tics of the metallic coating remain unchanged o
48、n phosphatized sheet.Additional information about this and other types of available surfacetreatments is presented in Appendix X2 of Specification A924/A924M.Cleaning procedures are described in Guides D6386 and D7396. (2009)powdering, nas related to metallic coatings, microcrackingand fine particle
49、 separation of generally brittle coatings whenthe coating is severely stressed. (2005)product analysis, na chemical analysis of a specimen takenfrom the semi-finished product or the finished product.(2014)purchaser, nas related to corrugated metal pipe, the entitythat contracts to buy the finished pipe. (2009)sample, na portion of the material that represents 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 s
