1、 ISO 2015 Steel castings for pressure purposes Pices moules en acier pour service sous pression INTERNATIONAL STANDARD ISO 4991 Third edition 2015-12-15 Reference number ISO 4991:2015(E) ISO 4991:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland A
2、ll 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 photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested
3、from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 4991:2015(E)Foreword iv 1 Scope . 1 2 Normative r
4、eferences 1 3 T erms and definitions . 1 4 Information to be supplied by the purchaser. 1 5 Heat treatment . 1 6 Welding . 2 7 Requirements 2 7.1 Chemical composition 2 7.2 Mechanical properties 2 8 Inspection and testing 2 8.1 General . 2 8.2 Sampling . 3 8.3 Formation of test lots 3 8.4 Non-destru
5、ctive testing . 3 8.5 Marking . 3 9 Supplementary requirements 3 Annex A (normative) Supplementary requirements 11 Annex B (informative) Welding conditions .14 Annex C (informative) Creep properties15 Annex D (informative) UNS cast grades similar to ISO cast grades 17 Bibliography .19 ISO 2015 All r
6、ights reserved iii Contents Page ISO 4991:2015(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each
7、 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 liaison with ISO, also take part in the work. ISO collaborates closely with the Internationa
8、l 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 Directives, Part 1. In particular the different approval criteria needed for the different
9、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 that some of the elements of this document may be the subject of patent rights. ISO shall not
10、 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 declarations received (see www.iso.org/patents). Any trade name used in this document is inf
11、ormation 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 information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see
12、 the following URL: Foreword - Supplementary information The committee responsible for this document is The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 11, Steel castings. This third edition cancels and replaces the second edition (ISO 4991:2005), which has been tech
13、nically revised. In particular, the following changes have been made: new and replacement International Standards have been added to the normative references (see Clause 2); a new numbering system has been included in all tables; in Table 1, grade designations and composition limits have been change
14、d where appropriate. a new Annex D containing Table D.1, showing UNS grades similar to ISO cast grades, has been added.iv ISO 2015 All rights reserved INTERNATIONAL ST ANDARD ISO 4991:2015(E) Steel castings for pressure purposes 1 Scope This International Standard covers steel castings for pressure
15、containing parts. It includes materials which are used for the manufacture of components subject to pressure vessel codes and components not subject to codes. This International Standard relates to castings manufactured from unalloyed and alloyed steel grades (characterized by their chemical composi
16、tion, Table 1, and mechanical properties, Tables 2, 3, 4 and 5). NOTE Annex D gives information on ISO grade designation and available UNS numbers which are similar to the ISO grade designation. 2 Normative references The following documents, in whole or in part, are normatively referenced in this d
17、ocument and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test method ISO 4885, F
18、errous products Heat treatments Vocabulary ISO 4990, Steel castings General technical delivery requirements ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 6892-2, Metallic materials Tensile testing Part 2: Method of test at elevated temperature ISO 1197
19、0, Specification and approval of welding procedures for production welding of steel castings ISO 13520, Determination of ferrite content in austenitic stainless steel castings 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in ISO 4885 and ISO 4990 apply
20、. 4 Information to be supplied by the purchaser Materials specified in this International Standard shall conform to the applicable requirements of ISO 4990 including the supplementary requirements listed in Annex A that are indicated in the enquiry and purchase order. 5 Heat treatment The type of he
21、at treatment shall comply with Table 6 for the specified grades. The temperatures given are for information only. When a grade may be delivered at different strength levels depending on the type of heat treatment (see Table 2), the purchaser shall state at the time of enquiry and order the type of h
22、eat treatment required. The symbols for the type of heat treatment are as follows: ISO 2015 All rights reserved 1 ISO 4991:2015(E)+N normalized+QT quenched and tempered+AT solution annealed NOTE For definitions, see ISO 4885. 6 Welding Welding is permitted, unless otherwise agreed. All the welds sha
23、ll conform to the same criteria for non-destructive testing as the relevant part of the casting. Welding shall be carried out in accordance with ISO 11970. The welding conditions are given in Annex B. 7 Requirements 7.1 Chemical composition An analysis of each heat shall be made by the manufacturer
24、to determine the contents of the specified elements. The chemical composition shall comply with the values given in Table 1. Permissible deviations for the product analysis are indicated in ISO 4990. 7.2 Mechanical properties The mechanical properties shall comply with the values given in Tables 2,
25、3, 4 and 5. Mechanical properties shall be measured on test pieces taken from test blocks (according to ISO 4990). The tensile tests at room temperature shall be carried out according to ISO 6892-1 and, if specified, impact tests according to ISO 148-1. If required by agreement at the time of enquir
26、y and order, impact energy properties at low temperature shall comply with Table 3. If required by agreement at the time of enquiry and order, impact energy values at room temperature shall comply with Table 4. If required by agreement at the time of enquiry and order, verification of the elevated t
27、emperature proof stress values shall be carried out at elevated temperatures in accordance with ISO 6892-2. In such a case, the values shall comply with Table 5. Creep resistance mean values are given for information, for some grades in Annex C. 8 Inspection and testing 8.1 General For all products
28、ordered to the requirements of this International Standard, specific inspection and testing is required.2 ISO 2015 All rights reserved ISO 4991:2015(E) 8.2 Sampling Test blocks shall be heat treated in production furnaces to the same procedure as the castings they represent. Test pieces shall not be
29、 cut from the test block until the latter has been heat treated. 8.3 Formation of test lots The formation of test lots shall be carried out in accordance with ISO 4990. 8.4 Non-destructive testing The following information shall be given at the time of enquiry and order in accordance with ISO 4990:
30、non-destructive methods required, area to be examined, acceptance criteria required. 8.5 Marking 8.5.1 Castings shall be marked for material identification. In addition, heat numbers, or serial numbers that are traceable to heat numbers, shall be marked on all castings. For small castings, it may be
31、 agreed at the time of the enquiry and order that they may be batched and that their identification is marked on a label attached to each batch. 8.5.2 Castings shall be marked with the manufacturers identification or symbol except where other provisions have been made between the manufacturer and pu
32、rchaser. 8.5.3 When more than one heat treatment type is available, the heat treatment applied shall be marked with a suffix added to the grade designation (see Table 2). 9 Supplementary requirements This International Standard also specifies supplementary requirements, which may be applied to steel
33、 castings. These requirements are provided for use when additional testing or inspection is desired and apply only when individually specified by the purchaser. A list of supplementary requirements which may be used at the option of the purchaser is given in ISO 4990 and in Annex A. If ferrite deter
34、mination is required for austenitic and austenitic-ferritic grades, it may be made using ISO 13520. ISO 2015 All rights reserved 3 ISO 4991:2015(E)Table 1 Chemical composition, in per cent, mass fraction Grade designation C Si Mn P S Cr Mo Ni V Cu Other Name Number max. max. max. GP240GH 1.0619 0,18
35、0,23 a 0,60 0,501,20 a 0,030 0,020 0,30 max. 0,12 max. 0,40 max. 0,03 max. 0,30 max. b GP280GH 1.0625 0,180,25 a 0,60 0,801,20 a 0,030 0,020 0,30 max. 0,12 max. 0,40 max. 0,03 max. 0,30 max. b G17Mn5 1.1131 0,150,20 0,60 1,001,60 0,020 0,025 0,30 max. 0,12 max. 0,40 max. 0,03 max. 0,30 max. b G20Mn5
36、 1.6220 0,170,23 0,60 1,001,60 0,020 0,020 0,30 max. 0,12 max. 0,80 max. 0,03 max. 0,30 max. G18Mo5 1.5422 0,150,20 0,60 0,801,20 0,020 0,020 0,30 max. 0,450,65 0,40 max. 0,050 max. 0,30 max. G20Mo5 1.5419 0,150,23 0,60 0,501,00 0,025 0,020 0,30 max. 0,400,60 0,40 max. 0,050 max. 0,30 max. G17CrMo55
37、 1.7357 0,150,20 0,60 0,501,00 0,020 0,020 1,001,50 0,450,65 0,40 max. 0,050 max. 0,30 max. G17CrMo910 1.7379 0,130,20 0,60 0,500,90 0,020 0,020 2,002,50 0,901,20 0,40 max. 0,050 max. 0,30 max. G12MoCrV52 1.7720 0,100,15 0,45 0,400,70 0,030 0,020 0,300,50 0,400,60 0,40 max. 0,220,30 0,30 max. G17CrM
38、oV510 1.7706 0,150,20 0,60 0,500,90 0,020 0,015 1,201,50 0,901,10 0,40 max. 0,200,30 0,30 max. G25NiCrMo3 1.6553 0,230,28 0,80 0,601,00 0,030 0,025 0,400,80 0,150,30 0,400,80 0,03 max. 0,30 max. G25NiCrMo6 1.6554 0,230,28 0,60 0,600,90 0,030 0,025 0,700,90 0,200,30 1,002,00 0,03 max. 0,30 max. G17Ni
39、CrMo136 1.6781 0,150,19 0,50 0,550,80 0,015 0,015 1,301,80 0,450,60 3,003,50 0,050 max. 0,30 max. G9Ni10 1.5636 0,060,12 0,60 0,500,80 0,020 0,015 0,30 max. 0,20 max. 2,003,00 0,050 max. 0,30 max. G9Ni14 1.5638 0,060,12 0,60 0,500,80 0,020 0,015 0,30 max. 0,20 max. 3,004,00 0,050 max. 0,30 max. GX15
40、CrMo5 1.7365 0,120,19 0,80 0,500,80 0,025 0,025 4,006,00 0,450,65 - 0,05 0,30 max. GX10CrMoV91 1.7367 0,080,12 0,200,50 0,300,60 0,030 0,010 8,09,5 0,851,05 0,40 max 0,180,25 - Nb 0,0600,10 N 0,0300,070 Al 0,02max Ti 0,01 max Zr 0,01 max GX15CrMo91 1.7376 0,120,19 1,00 0,350,65 0,030 0,030 8,0010,00
41、 0,901,20 0,40 max. 0,05 0,30 max. GX8CrNi121 1.4107 0,10 max. 0,40 0,500,80 0,030 0,020 11,5012,50 0,50 max. 0,801,50 0,08 max. 0,30 max. GX23CrMoV121 1.4931 0,200,26 0,40 0,500,80 0,030 0,020 11,3012,20 1,001,20 1,00 max. 0,250,35 0,30 max. W 0,50 max GX3CrNi134 1.6982 0,05 max. 1,00 1,00 max. 0,0
42、35 0,015 12,0013,50 0,70 max. 3,505,00 0,08 max. 0,30 max. GX4CrNi134 1.4317 0,06 max. 1,00 1,00 max. 0,035 0,025 12,0013,50 0,70 max. 3,505,00 0,08 max. 0,30 max. GX4CrNiMo165-1 1.4405 0,06 max. 0,80 1,00 max. 0,035 0,025 15,0017,00 0,701,50 4,006,00 0,08 max. 0,30 max. aFor each reduction of 0,01
43、% carbon below the maximum specified, an increase of 0,04 % manganese above the maximum specified will be permitted to a maximum of 1,40 %. b%Cr + %Mo + %Ni + %V + %Cu 1,00 %. 4 ISO 2015 All rights reserved ISO 4991:2015(E)Grade designation C Si Mn P S Cr Mo Ni V Cu Other Name Number max. max. max.
44、GX2CrNiN1911 1.4487 0,030 max. 1,50 2,00 max. 0,035 0,030 18,0020,00 - 9,0012,00 - 0,50 max. 0,12 N 0,20 GX5CrNi1910 1.4308 0,07 max. 1,50 1,50 max. 0,040 0,030 18,0020,00 - 8,0011,00 - 0,50 max. GX5CrNiNb1911 1.4552 0,07 max. 1,50 1,50 max. 0,040 0,030 18,0020,00 - 9,0012,00 - 0,50 max. 8xC Nb 1,00
45、 GX2CrNiMoN19112 1.4490 0,030 max. 1,50 2,00 max. 0,035 0,030 18,0020,00 2,002,50 9,0012,00 - 0,50 max. 0,12 N 0,20 GX5CrNiMo19112 1.4408 0,07 max. 1,50 1,50 max. 0,040 0,030 18,0020,00 2,002,50 9,0012,00 - 0,50 max. GX5CrNiMoNb19112 1.4581 0,07 max. 1,50 1,50 max. 0,040 0,030 18,0020,00 2,002,50 9,
46、0012,00 - 0,50 max. 8xC Nb 1,00 GX2CrNiMoN225-3 1.4470 0,030 max. 1,00 2,00 max. 0,035 0,025 21,0023,00 2,503,50 4,506,50 - 0,50 max. 0,12 N 0,20 GX2CrNiMoCuN265-33 1.4451 0,030 max. 1,00 1,50 max. 0,035 0,025 25,0027,00 2,503,50 5,007,00 - 2,753,50 0,12 N 0,22 GX2CrNiMoN267-4 1.4469 0,030 max. 1,00
47、 1,00 max. 0,035 0,025 25,0027,00 3,005,00 6,008,00 - 1,30 max. 0,12 N 0,22 GX2NiCrMo28202 1.4458 0,030 max. 1,00 2,00 max. 0,035 0,025 19,0022,00 2,002,50 26,0030,00 - 2,00 max. N 0,20 aFor each reduction of 0,01 % carbon below the maximum specified, an increase of 0,04 % manganese above the maximu
48、m specified will be permitted to a maximum of 1,40 %. b%Cr + %Mo + %Ni + %V + %Cu 1,00 %. Table 1 (continued) ISO 2015 All rights reserved 5 ISO 4991:2015(E) Table 2 Tensile properties at room temperature Grade designation Type of heat treatment a R p0,2 MPa min. R p1,0 MPa min. R m MPa A % min. Nam
49、e Number GP240GH 1.0619 +N b 240 - 420-600 22 GP240GH 1.0619 +QT 240 420600 22 GP280GH 1.0625 +N b 280 - 480640 22 GP280GH 1.0625 +QT 280 480640 22 G17Mn5 1.1131 +QT 240 - 450600 24 G20Mn5 1.6220 +N b 300 - 480620 20 G20Mn5 1.6220 +QT 300 - 500650 22 G18Mo5 1.5422 +QT 240 - 440590 23 G20Mo5 1.5419 +QT 245 - 440690 22 G17CrMo55 1.7357 +Q
