1、 ISO 2014 Continuous hot-dip zinc-coated and zinc-iron alloy-coated carbon steel sheet of structural quality Tles en acier au carbone revtues de zinc ou dun alliage zinc-fer en continu par immersion chaud, de qualit destine la construction INTERNATIONAL STANDARD ISO 4998 Sixth edition 2014-06-01 Ref
2、erence number ISO 4998:2014(E) ISO 4998:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including p
3、hotocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 74
4、9 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 4998:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Dimensions . 2 5 Conditions of manufacture 3 5.1 Chemical composition 3 5.2 Mechani
5、cal properties 4 5.3 Coating . 4 5.4 Weldability 6 5.5 Painting 6 5.6 Surface treatments 6 5.7 Dimensional and shape tolerances 6 6 Sampling 6 6.1 Chemical composition 6 6.2 Tensile test 7 6.3 Coating tests 7 7 Test methods . 7 7.1 Tensile test 7 7.2 Coating properties . 8 8 Designation system 8 8.1
6、 Coating type . 8 8.2 Coating mass . 8 8.3 Coating finish conditions 8 8.4 Surface treatments 8 8.5 Example . 9 9 Retests . 9 9.1 Machining and flaws. 9 9.2 Elongation . 9 9.3 Additional tests . 9 10 Resubmission . 9 11 Workmanship 9 12 Inspection and acceptance 10 13 Coil size 10 14 Marking .10 15
7、Information to be supplied by the purchaser10 Annex A (normative) Orders requiring base metal thickness 12 Bibliography .13 ISO 4998:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
8、ring International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in l
9、iaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC
10、Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility th
11、at some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent d
12、eclarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as informat
13、ion about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. This sixth edition cancels an
14、d replaces the fifth edition (ISO 4998:2011), which has been technically revised.iv ISO 2014 All rights reserved INTERNATIONAL ST ANDARD ISO 4998:2014(E) Continuous hot-dip zinc-coated and zinc-iron alloy-coated carbon steel sheet of structural quality 1 Scope 1.1 This International Standard specifi
15、es continuous hot-dip zinc-coated and zinc-iron alloy-coated carbon steel sheet of structural quality. 1.2 The product is intended for applications where resistance to corrosion is of prime importance. 1.3 The steel sheet is produced in a number of grades, coating masses, ordering conditions, and su
16、rface treatments. 1.4 This International Standard does not cover steels designated as commercial quality, or drawing quality, which are covered in ISO 3575 2 . 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for i
17、ts application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method ISO 3497, Metallic c
18、oatings Measurement of coating thickness X-ray spectrometric methods ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 7438, Metallic materials Bend test ISO 16163:2012, Continuously hot-dipped coated steel sheet products Dimensional and shape tolerances 3
19、 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 continuous hot-dip zinc-coated steel sheet product obtained by hot-dip coating of cold-reduced sheet coils or hot-rolled descaled sheet coils on a continuous zinc-coating line 3.2 normal coati
20、ng coating formed as a result of unrestricted growth of zinc crystals during normal solidification Note 1 to entry: This coating has a metallic lustre and is of the type normally furnished for a wide variety of applications. It can be furnished as S or N; however, it can be variable in appearance an
21、d is not suitable for decorative painting. ISO 2014 All rights reserved 1 ISO 4998:2014(E) 3.3 minimized spangle coating coating obtained by restricting normal spangle formation during the solidification of the zinc Note 1 to entry: This product can have some lack of uniformity in surface appearance
22、 within a coil, or from coil to coil. 3.4 s m o o t h f i n i sh smooth coating produced by skin-passing the coated material in order to achieve an improved surface condition as compared with the normal as-coated product 3.5 zinc-iron alloy coating coating produced by processing the zinc-coated stee
23、l sheet so that the coating formed on the base metal is composed of zinc-iron alloys Note 1 to entry: This product, designated ZF, is not spangled, is normally dull in appearance, and, for some applications, can be suitable for immediate painting without further treatment, except normal cleaning. Zi
24、nc-iron alloy coatings can powder during severe forming. 3.6 differential coating coating having a specified coating mass designation on one surface, and a different coating mass designation on the other surface 3.7 skin pass light cold-rolling of the zinc-coated steel sheet Note 1 to entry: The pur
25、pose of the skin pass is to produce a higher degree of surface smoothness and thereby improve the surface appearance. The skin pass also temporarily minimizes the occurrence of a surface condition known as stretcher strain (Luders Lines) or fluting during the fabrication of finished parts. The skin
26、pass also controls and improves flatness. Some increase in hardness and loss of ductility will result from skin passing. 3.8 lot 50 t or less of sheet of the same grade rolled to the same thickness and coating condition 4 Dimensions 4.1 Zinc-coated or zinc-iron alloy-coated structural-quality sheet
27、is produced in thicknesses from 0,25 mm to 5 mm after zinc coating, and in widths of 600 mm and over in coils and cut lengths. Zinc- coated or zinc-iron alloy-coated sheet less than 600 mm wide can be slit from wide sheet and will be considered as sheet. NOTE Thicknesses less than 0,4 mm might not b
28、e available in grades 220, 250, 280, and 320. 4.2 The thickness of zinc- and zinc-iron alloy-coated sheet steel can be specified as a combination of the base metal and metallic coating, or base metal alone. The purchaser shall indicate on the order which method of specifying thickness is required. I
29、n the event that the purchaser does not indicate any preference, the thickness as a combination of the base metal and coating will be provided. Annex A describes the requirements for specifying the thickness as base metal alone.2 ISO 2014 All rights reserved ISO 4998:2014(E) 5 Conditions of manufact
30、ure 5.1 Chemical composition The chemical composition (heat analysis) shall not exceed the values given in Tables 1 and 2. On request, a report of the heat analysis shall be made to the purchaser. A verification analysis (product analysis) can be made by the purchaser to verify the specified analysi
31、s of the semi-finished or finished steel, and shall take into consideration any normal heterogeneity. The sampling method and deviation limits shall be agreed upon between the interested parties at the time of ordering. The product analysis tolerances shall be in accordance with Tables 2 and 3. The
32、processes used in making the steel and in manufacturing zinc-coated sheet of structural quality are left to the discretion of the manufacturer. When requested, the purchaser shall be informed of the steelmaking process being used. Table 1 Chemical composition (heat analysis) Mass fractions as a perc
33、entage (%) Element Maximum o f s p e c i f i e d e l e m e n t C 0,25 Mn 1,70 P a 0,05 S 0,035 aGrades 250 and 280: P 0,10 % max.; grade 350: P 0,20 % max. Table 2 Limits on additional chemical elements Mass fractions as a percentage (%) Element Cu amax. Ni amax. Cr abmax. Mo abmax. Nb max. V cmax.
34、Ti max. Heat analysis 0,20 0,20 0,15 0,06 0,008 0,008 0,008 Product analysis 0,23 0,23 0,19 0,07 0,018 0,018 0,018 NOTE Each of the elements listed in this table shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium, or molybdenum present is less than 0,02
35、 %, the analysis can be reported as 0,02 %. aThe sum of copper, nickel, chromium, and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these elements are specified, the sum does not apply, in which case only the individual limits on the remaining elements will apply. bThe sum
36、 of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are specified, the sum does not apply, in which case only the individual limits on the remaining elements will apply. cHeat analysis greater than 0,008 % can be supplied after agreement between t
37、he producer and purchaser. ISO 2014 All rights reserved 3 ISO 4998:2014(E) Table 3 Product analysis tolerances Mass fractions as a percentage (%) Element Maximum o f s p e c i f i e d e l e m e n t Tolerance over ma x im um specif i ed C 0,25 0,04 Mn 1,70 0,05 P 0,05 0,01 S 0,035 0,01 NOTE The above
38、 maximum tolerance is the allowable excess over the specified requirement and not the heat analysis. 5.2 Mechanical properties Structural quality grades shall satisfy the mechanical properties shown in Table 4. On request, a report of the mechanical properties shall be made to the purchaser. Table 4
39、 Mechanical properties Grade R eLmin. aMPa b R mMPa A min. % c L o= 50 mm L o= 80 mm 220 220 310 20 18 250 250 360 18 16 280 280 380 16 14 320 320 430 14 12 350 350 450 12 10 380 380 540 12 10 550 550 570 R eL= lower yield strength R m= tensile strength (for information only) A = percentage elongati
40、on after fracture L o= gauge length on test piece aThe yield strength specified in this table shall be the lower yield strength (R eL ) .The values can also be measured by 0,5 % total elongation proof strength (proof strength under load) or by 0,2 % offset when a definite yield phenomenon is not pre
41、sent. When the upper yield strength (R eH ) is specified, the values shall be 20 MPa above the R eLvalues for each grade. b1 MPa = 1 N/mm 2 . cUse either L o= 50 mm or L o= 80 mm to measure elongation. For material up to and including 0,6 mm in thickness, the elongation values in this table shall be
42、 reduced by 2. 5.3 Coating 5.3.1 Coating mass The coating mass limits shall conform to the limits for the designations shown in Table 5. The coating mass is the total amount of coating on both sides of the sheet, expressed in grams per square metre. The interested parties shall agree upon the coatin
43、g mass of differentially coated product. If a maximum coating mass is required, the manufacturer shall be notified at the time of ordering.4 ISO 2014 All rights reserved ISO 4998:2014(E) Table 5 Mass of coating (total both sides) Coating designation Minimum check limit Triple-spot test g/m 2(of shee
44、t) Single-spot test g/m 2(of sheet) Z001 No minimum b No minimum b Z100 100 85 Z180 180 150 Z200 200 170 Z275 275 235 Z350 350 300 Z450 a 450 385 Z600 a 600 510 Z700 a 700 585 ZF001 No minimum b No minimum b ZF100 100 85 ZF180 180 150 NOTE 1 The amount of coating for each coating designation is not
45、always evenly divided between the two surfaces of a zinc- coated sheet, nor is the zinc coating evenly distributed from edge to edge. However, it can normally be expected that not less than 40 % of the single-spot check limit will be found on either surface. NOTE 2 The coating thickness can be estim
46、ated from the coating mass by using the following relationship: 100 g/m 2total both sides = 0,014 mm total both sides. aCoating masses corresponding to the designations Z450, Z600, and Z700 are not available for steels with minimum yield stresses of 320 N/mm 2 , 350 N/mm 2 , 380 N/mm 2 , and 550 N/m
47、m 2 . b“No minimum” means that there are no established minimum check limits for triple- and single-spot tests. 5.3.2 Coating adherence The zinc-coated sheet shall be capable of being bent in any direction, in accordance with the mandrel diameter requirements for the coating designations included in
48、 Table 6. Flaking of the coating within 7 mm from the edge of the test piece shall not be cause for rejection. The bend-test requirements of Table 6 do not apply to zinc-iron alloy coating. Table 6 Coating bend-test requirements Grade 180 bend-mandrel diameter e 3 mm e 3 mm Coating designation Up to
49、 Z350 Z450 Z600 Z700 Up to Z450 Z600 Z700 220 1a 2a 3a 2a 3a 4a 250 1a 2a 3a 2a 3a 4a 280 2a 2a 3a 3a 3a 4a 320 3a 3a 3a 3a 3a 4a 350 3a 3a 3a 3a 3a 4a 380 3a 3a 3a 3a 3a 4a e = thickness of sheet, in millimetres a = thickness of bend test piece ISO 2014 All rights reserved 5 ISO 4998:2014(E) 5.4 Weldability This product is normally suitable for welding if appropriate welding conditions are selected with special attention to the heavier coatings. As the carbon content increases above 0,15 %, spot welding be
