1、Designation: A902 18A902 18aStandard 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 numbe
2、r in parentheses 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 to metallic coatings used in the steel industry, and to the steel on whichthe coating
3、s are applied. Terms that are generally understood or adequately defined in other readily available sources are notincluded.1.2 When a term is used in anASTM document for which CommitteeA05 is responsible it is included herein only when judged,after review by Subcommittee A05.18, to be a generally u
4、sable term.1.3 Definitions that are identical to those published by other ASTM committees or other standards organizations are identifiedwith the ASTM standard designation (for example, Terminology B374) or with the abbreviation of the name of the organization.1.4 A definition is a single sentence w
5、ith additional information included in notes. The year the definition was adopted, or theyear of latest revision, is appended. The responsible subcommittee reviews the definition for each term at five-year intervals, andprepares revisions as needed.1.5 This international standard was developed in ac
6、cordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM
7、 Standards:2A641/A641M Specification for ZincCoated (Galvanized) Carbon Steel WireA924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip ProcessB374 Terminology Relating to ElectroplatingD6386 Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iro
8、n and Steel Product and Hardware Surfaces 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 either commercially-pure aluminum (Type 2) or aluminum-silicon
9、alloy(Type 1), applied by the hot-dip process. (2005)barb, nas related to barbed wire, a short length of wire, with exposed ends cut on a bias to produce sharp points. (1995)barbed wire, na fabricated wire product consisting of two line wires twisted to form a two-wire strand, into which 2-point or4
10、-point barbs are tightly wrapped and locked into place at specified intervals. (1995)basemetal, nas related to metallic-coated steel, the steel to which the coating is applied, as distinguished from the coating metal.(1990)batch coating, nof metallic coated steel products, the process of discontinuo
11、us-sequential passage of steel articles through thevarious steps of the coating process, such as, cleaning, pickling, fluxing, and coating. (1995)1 This terminology is under the jurisdiction ofASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcommit
12、tee A05.18on Editorial and Terminology.Current edition approved May 1, 2018Dec. 1, 2018. Published May 2018January 2019. Originally approved in 1990. Last previous edition approved in 20172018 asA902 - 17a.A902 - 18. DOI: 10.1520/A0902-18.10.1520/A0902-18A.2 For referencedASTM standards, visit theAS
13、TM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an in
14、dication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be
15、 considered the official document.*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 States1breaking strength, nas related to wire, the maximum force developed prior to fracture d
16、uring tension testing of wire and wireproducts.DISCUSSIONIn testing of stranded wire products, the maximum force may be developed after fracture of one or more individual wires. (1993)carbon steel, nsteel having a maximum carbon content of 2.0 % and a composition conforming to the following: (1) nom
17、inimum content is specified for chromium, cobalt, columbium (niobium), molybdenum, nickel, titanium, tungsten, vanadium,zirconium, or any other element added to obtain a desired alloying effect; (2) the specified minimum and maximum values forcopper do not exceed 0.35 % and 0.60 %, respectively; (3)
18、 the specified maximum for any of the following elements does notexceed these percentages: manganese 1.65 %, silicon 0.60 %, columbium (niobium) 0.015 %, vanadium 0.008 %, boron0.0008 %, or titanium 0.025 %; and (4) the incidental content of the following elements does not exceed these percentages:n
19、ickel, 0.20 %; chromium, 0.15 %; and molybdenum, 0.06 %.DISCUSSIONCarbon steels typically contain small quantities of certain residual elements from the feed materials. When the quantity of such retained elementsexceeds the values listed in (4) above, the characteristics of the steel may differ from
20、 that of carbon steel without those elements to a degree that thesteel may be unsatisfactory for the intended use. The composition limits stated in this definition shall not apply to stabilized steel. (2005)chemical treatment, na passivating surface protectant normally applied to metallic coatings t
21、o retard the formation of corrosionproducts during shipment and storage (storage stain).DISCUSSIONThe corrosion-inhibiting characteristics of chemical treatments are limited. If chemically-treated material becomes wet in shipment or storage, theproduct should be used or dried immediately. Some types
22、 of chemical treatments may be inappropriate in certain applications because of possibleundesirable effects on further processing, such as phosphatizing, spot welding, or painting. (2007)commercial steel, CS, na metallic-coated steel sheet designation which includes carbon steel products intended fo
23、r generalfabrication applications involving little or no bending or forming. (2013)DISCUSSIONThe chemical composition requirements for this designation can be found in the appropriate sheet product specification. (2013)continuous coating, nof metallic coated steel products, the process of uninterrup
24、ted passage of long lengths of steel products,usually steel sheet, tube, pipe, or wire, through the various processing steps such as cleaning, annealing, and coating.DISCUSSIONContinuous coating involves the use of equipment that is capable of joining long lengths of product without stoppage of the
25、coating process.Continuous coating of preformed tube or pipe is limited to the outer surface, since the coating material cannot be supplied to the inner surface. (2006)deep drawing steel, DDS, na metallic coated steel sheet designation which includes low carbon steel products intended forapplication
26、s involving particularly severe forming or deep drawing.DISCUSSIONThe chemical composition requirements for this designation can be found in the appropriate sheet product specification. (2013)delamination, nas related to metallic coated steel, the separation of a coating (either full or partial thic
27、kness) from underlyinglayers; the separation can occur in small localized areas or large areas of surface.DISCUSSIONFlaking, peeling, and spalling are colloquial terms sometimes used to describe the separation. (1997)differentially coated sheet, nmetallic coated sheet with unequal specifications for
28、 the weight (mass) of metallic coating on eachof the two surfaces. (2012)A902 18a2electrolytic process, nthe application of a metallic coating on a steel product by passing an electric current through a chemicalsolution in which the product is immersed; the coating may be applied in a continuous pro
29、cess or a batch process. (1995)extra deep drawing steel, EDDS, na metallic-coated steel sheet designation, which requires the use of non-aging,chemically-stabilized carbon steel intended for applications requiring maximum formability. (2013)DISCUSSIONThe chemical composition requirements for this de
30、signation can be found in the appropriate sheet product specification. (2013)extra smooth sheet, nproduct produced by cold rolling the metallic coated sheet with a small reduction in thickness to impartboth the desired surface texture and resistance to stretcher strains and fluting. (Syn. skin passe
31、d sheet)DISCUSSIONExtra smooth is frequently specified when fluting or stretcher strains may be a hazard. Extra smooth may not be available in all coating types or weights(masses). (2012)fabricator, nas related to corrugated metal pipe, (1) the organization that produces the finished pipe, or (2 ) f
32、or structural platepipe, the organization that processes flat sheets and other items needed for the field assembly of the finished products. (1990)flakingSee delamination. (1994)forming steel, FS, na metallic-coated steel sheet designation which includes carbon steel products intended for applicatio
33、nsinvolving moderate forming or mild drawing which might not be achieved by commercial steel. (2013)DISCUSSIONThe chemical composition requirements for this designation can be found in the appropriate sheet product specification. (2013)galvanized coating, na coating of virtually pure zinc on steel,
34、applied by various methods or processes including hot-dipprocesses and electrodeposition (electrolytic processes).DISCUSSIONFor hot-dipped galvanized coatings, the molten bath is typically at least 99 % zinc; as applied to the steel, the coating typically contains intermetalliclayers of zinc-iron al
35、loys adjacent to the steel surface. Other methods of applying the zinc coating include metal spraying (metallizing), sherardizing,vacuum deposition, and mechanical deposition, but there is not general agreement that all produce a “galvanized coating.” There is general agreementthat the coating produ
36、ced by application of zinc-rich paint is not a “galvanized coating.” (1999)galvannealed coating, na coating on steel of zinc-based alloy, containing about 6 to 15 % iron, produced by hot-dip immersionin a high-zinc content coating bath, followed by heating the steel to induce diffusion alloying betw
37、een the molten zinc coatingand the steel. (1994)heat, na specific lot of material representing a single melt of steel produced to a specified chemical composition. (2017)heat analysis, nthe chemical analysis determined by the steel producer as being representative of the chemical composition ofa hea
38、t of steel. (2018)DISCUSSIONThe sample on which the analysis is performed is usually taken from the molten steel. (2018)hot-dip process, nthe application of a metallic coating on a steel product by immersion of the product in the molten metal whichforms the coating; the coating is applied in either
39、a continuous process or a batch process. (2006)DISCUSSIONMetallic coatings applied by the hot-dip process are characterized by the presence of an intermediate alloy layer which forms as a result of ametallurgical reaction between the steel surface and the molten metal. (2006)inclusion control, nthe
40、process of reducing the volume fraction of inclusions or modifying the shape of inclusions to improveformability, weldability, and machinability.A902 18a3DISCUSSIONInclusions, especially those elongated during the rolling process, create the conditions for initiating, and/or propagating cracks when
41、the material isstretched or bent during the manufacture of a part. The adverse effects of inclusions are minimized by reducing the content of inclusions in the steeland/or by altering the shape of inclusions through the use of additions during the steelmaking process that change the elongated shape
42、of the inclusionsto less harmful, small, well-dispersed globular inclusions. (2008)lot, na finite quantity of a given product, produced under conditions that are considered uniform for sampling purposes.DISCUSSIONIn the case of metallic-coated iron or steel products, the conditions which may be cons
43、idered necessary for a single lot are similar units, coating atapproximately the same time, in the same manner, in a single coating bath. Consideration must also be given to the uniformity of the iron or steelproduct to which the coating is applied, such as being from a single heat. For material sam
44、pled after shipment from the manufacturers or coatersfacility (where the heat or processing identification may have been lost), a lot would consist of all similar material in a given shipment. (2006)manufacturer, nas related to corrugated metal pipe, the organization that produces the metal sheet fr
45、om which pipe is made.(1990)mechanical polishing, nof metallic coatings, the loosening and detachment of superficial, small particles of coating metal duringprocessing or testing, due to mechanical abrasion. (1994)minimum thickness, nof metallic-coated steel sheet, an ordering designation which indi
46、cates that the applicable tolerance forthickness is all plus from the ordered thickness. (2013)nominal thickness, nof metallic coated steel sheet, an ordering designation which indicates that the applicable tolerance forthickness is divided equally, plus and minus from the ordered thickness. (2012)o
47、iled, adjdescribing a coating applied to metallic coated steel sheet alone or in addition to chemical treatment for furtherprotection against the onset of storage corrosion; the oil coating is intended as a corrosion inhibitor only and not as a rollingor drawing lubricant. (2001)peelingSee delaminat
48、ion. (1994)phosphatized, adjpertains to the treatment, in a phosphate solution, of uncoated and metallic coated sheet to prepare the surfacefor painting without further treatment except normal cleaning. (Syn. phosphated, phosphate coated)DISCUSSIONThis is a surface treatment only and other character
49、istics of the metallic coating remain unchanged on phosphatized sheet.Additional information aboutthis and other types of available surface treatments is presented in Appendix X2 of Specification A924/A924M. Cleaning procedures are described inGuides D6386 and D7396. (2009)powdering, nas related to metallic coatings, microcracking and fine particle separation of generally brittle coatings when thecoating is severely stressed. (2005)product analysis, na chemical analysis of a specimen taken from the semi-finished product or the
