1、Designation: A902 13aA902 13bStandard 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 numb
2、er 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 coatin
3、gs 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
4、usable 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
5、with 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.2. Referenced Documents2.1 ASTM Standards:2A641/A6
6、41M 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 Iron and Steel Product
7、 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 alloy(Type 1), appl
8、ied 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-point barbs are ti
9、ghtly 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 discontinuous-sequential passa
10、ge of steel articles through thevarious steps of the coating process, such as, cleaning, pickling, fluxing, and coating. (1995)breaking strength, nas related to wire, the maximum force developed prior to fracture during tension testing of wire and wireproducts.1 This terminology is under the jurisdi
11、ction ofASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcommittee A05.18on Editorial and Terminology.Current edition approved June 1, 2013Nov. 1, 2013. Published June 2013November 2013. Originally approved in 1990. Last previous edition approved i
12、n 2013 asA902 - 13.A902 - 13a. DOI: 10.1520/A0902-13A.10.1520/A0902-13B.2 For referencedASTM standards, visit theASTM 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 AS
13、TM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication 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 consul
14、t prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be 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, P
15、A 19428-2959. United States1DISCUSSIONIn 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) nominimum content is s
16、pecified 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) the specified maxi
17、mum 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:nickel, 0.20 %; chro
18、mium, 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 that of carbon ste
19、el 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 to retard the format
20、ion 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 of chemical treatm
21、ents 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 for generalfabricatio
22、n 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.continuous coating, nof metallic coated steel products, the process of uninterrupted passage of long length
23、s 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 coating process.Continuous
24、 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 forapplications involving particularly s
25、evere 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 thickness) from underlyinglaye
26、rs; 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 the weight (mass) of meta
27、llic coating on eachof the two surfaces. (2012)electrolytic 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 process or a batch process. (1995)A902
28、 13b2extra 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 designation can be found in
29、the appropriate sheet product specification.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 passed sheet)DISCUSSIONExtra smooth is
30、 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 ) for structural platepipe, the orga
31、nization 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 applicationsinvolving moderate forming or m
32、ild 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.galvanized coating, na coating of virtually pure zinc on steel, applied by various methods or processes
33、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 alloys adjacent to the steel surface. Othe
34、r 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 produced by application of zinc-rich paint is
35、 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 between the molten zinc coatingand the steel
36、. (1994)heat, na specific lot of material representing a single melt of steel produced to a specified chemical analysis. (1991)heat analysis, nthe chemical composition of a specific production lot of liquid steel. (2003)DISCUSSIONThe sample on which the analysis is performed is usually taken from th
37、e molten steel.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 a continuous process or a batch process. (2006)DISCUSSIONMetallic coatings applied by the hot-dip process
38、 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.inclusion control, nthe process of reducing the volume fraction of inclusions or modifying the shape of inclusions to improveformability
39、, weldability, and machinability.DISCUSSIONInclusions, especially those elongated during the rolling process, create the conditions for initiating, and/or propagating cracks when the material isstretched or bent during the manufacture of a part. The adverse effects of inclusions are minimized by red
40、ucing the content of inclusions in the steelA902 13b3and/or by altering the shape of inclusions through the use of additions during the steelmaking process that change the elongated shape of the inclusionsto less harmful, small, well-dispersed globular inclusions. (2008)lot, na finite quantity of a
41、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 considered necessary for a single lot are similar units, coating atapproximately the same time, in the same manner,
42、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 sampled after shipment from the manufacturers or coatersfacility (where the heat or processing identification may h
43、ave 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 from which pipe is made.(1990)mechanical polishing, nof metallic coatings, the loosening and detachment of superfi
44、cial, small particles of coating metal duringprocessing or testing, due to mechanical abrasion. (1994)minimum thickness, nof metallic-coated steel sheet, an ordering designation which indicates that the applicable tolerance forthickness is all plus from the ordered thickness. (2013)nominal thickness
45、, 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)oiled, adjdescribing a coating applied to metallic coated steel sheet alone or in addition to chemical treatment
46、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 delamination. (1994)phosphatized, adjpertains to the treatment, in a phosphate solution, of uncoated and metallic coated
47、sheet to prepare the surfacefor painting without further treatment except normal cleaning. (Syn. phosphated, phosphate coated)DISCUSSIONThis is a surface treatment only and other characteristics of the metallic coating remain unchanged on phosphatized sheet.Additional information aboutthis and other
48、 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 s
49、everely stressed. (2005)product analysis, na chemical analysis of the semifinished or finished steel. (1993)purchaser, nas related to corrugated metal pipe, the entity that contracts to buy the finished pipe. (2009)sample, na portion of the material in a lot, selected according to a specific sampling plan, 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 ofwire or steel sheet). (1994)seam, n
