1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.060.10 ISBN 0-626-14391-8 SANS 1700-5-10:2003 Edition 1.1 ISO 3506-3:1997 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Fasteners Part 5: General requ
4、irements and mechanical properties Section 10: Mechanical properties of corrosion-resistant stainless-steel fasteners Set screws and similar fasteners not under tensile stress This national standard is the identical implementation of ISO 3506-3:1997 and is adopted with the permission of the Internat
5、ional Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2003 SANS 1700-5-10:2003 Edition 1.1 ISO 3506-3:1997 Edition
6、1 Table of changes Change No. Date Scope 1 2003 To change the designation of SABS standards to SANS standards with no technical changes. National foreword This South African standard was approved by National Committee STANSA TC 5120.01, Screw threads and fasteners, in accordance with procedures of S
7、tandards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS edition cancels and replaces the first SABS edition (SABS 1700-5-10:1998). INTERNATIONAL STANDARD ISO 3506-3 First edition 19974 2-01 Mechanical properties of corrosion- resistant stainless-steel fasteners - Part 3
8、: Set screws and similar fasteners not under tensile stress Caractkistiques mkaniques des Mments de fixation en acier inoxydable rhsistant A Ia corrosion - Partie 3: Vis sans iete et Mments de fixation similaires non soumis a des contraintes de traction Reference number ISO 3506-3: 1997(E) ISO 3506-
9、3: 1997(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. Esch member body interested in a subject fo
10、r 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 patt in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on
11、 all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard
12、ISO 3506-3 was prepared by Technical Committee ISO/TC 2, fasteners, Sub-Committee SC 1, Mechanical properlies of fasteners. This first edition, together with ISO 3506-1 and ISO 3506-2, cancels and replaces ISO 3506:1979, which has been technically revised. ISO 3506 consists of the following Patts, u
13、nder the general title Mechanical properfies of corrosion-resistant stainless-steel fasteners. - Parf 1: Belts, screws and studs - Part2: Nuts - Parf 3: Set screws and similar fasteners not under tensile stress Annexes A to F of this part of ISO 3506 are for information only. 0 ISO 1997 All rights r
14、esetved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case postale 56
15、 l CH-121 1 Geneve 20 l Switzerland Internet central iso.ch x.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii ISO ISO 3506=3:1997(E) Introduction In the preparation of this part of ISO 3506 special attention has been given to the fundamentally different property characteristi
16、cs of the stainless steel fastener grades compared with those of carbon steel and low-alloy steel fasteners. Austenitic stainless steels are strengthened only by cold working and consequently the components do not have as homogeneous a condition as hardened and tempered Parts. These special features
17、 have been recognized in the elaboration of the property classes and the test procedures for mechanical properties. . . . Ill This page intentionally left blank INTERNATIONAL STANDARD 0 ISO ISO 3506-3: 1997(E) Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 3: Set screw
18、s and similar fasteners nst under tensile stress 1 Scope This patt of ISO 3506 specifies the mechanical proper-Ges of set screws and similar fasteners not under tensile stress made of austenitic stainless steel when tested over an ambient temperature range of 15 “C to 25 OC. Propet-ties will vary at
19、 higher or lower temperatures. It applies to set screws and similar fasteners - with nominal thread diameters (d) fram i,6 mm up to and including 24 mm; - of triangular ISO metric threads with diameters and pitches according to ISO 68-1, ISO 261 and ISO 262; - of any shape. lt does not apply to scre
20、ws with special properties such as weldability. This patt of ISO 3506 does not define corrosion or Oxidation resistance in particular environments. The aim of this part sf ISO 3506 is a classification into property classes of corrosion resistant stainless steel fasteners. Corrosion and Oxidation per
21、formances and mechanical properties for use at elevated or sub-zero temperatures must be the subject of agreement between user and manufacturer in each particular case. Annex D Shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content. All austenitic stainl
22、ess steel fasteners are normally non-magnetic in the annealed condtition; after cold working, some magnetic proper-Ges may be evident (see annex E). 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this patt of ISO 3506
23、. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this part of ISO 3506 are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. Wlembers sf IEC and IS
24、O maintain registers of currently valid International Standards. ISO 68-1: -1), ISO general purpose screw threads - Basic Profile - Part 7: Metric screw threads. ISO 261: -2), ISO general purpose metric screw threads - General plan. 1) To be published. (Revision of ISO 68:1973) 2) To be published. (
25、Revision of ISO 261:1973) ISO 3506-3: 1997(E) 0 ISO ISO 262:-3), ISO generai purpose metric screw threads - SePected sizes for screws, bolts and nuts, ISO 898-5:-41, Mechanical properiies of fasteners - Part 5: Set screws and similar threaded fasteners not under tensile Stresses. ISO 965-3:-5), ISO
26、general-purpose metric screw threads - Tolerantes - Part 2 Deviations for constructional threads. ISO 3651-1: -51, Determination of resistance to intergranular corrosion stainiess steels - Part 7: Austenitic and ferritic-austenitic (duplex) stainless steels - (Huey test). Corrosion fest in nitric ac
27、id medium by measurement of loss in mass ISO 3651-2:-6), Determination of resistance to intergranular corrosion stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (dupiex) stainless steels - Corrosion test in media containing sulfuric acid. ISO 6506: 1981, Metallic materials - H
28、ardness fest - Brinell test ISO 6507-1: 1997, Metallic materials - Hardness test - Vickers test - Parf 7: Test method. ISO 6508: 1986, Metallic materials - Hardness fest - Rockwell fest (scales A - B - C - D - E - F- G - H - K). 3 Designation, marking and finish 3.1 Designation The designation Syste
29、m for stainless steel grades and property classes for set screws and similar fasteners is shown in figure 1. The designation of the material consists of two blocks which are separated by a hyphen. The first block designates the steel grade, the second block the property class. The designation of the
30、 steel grade (first block) consists of the Ietter A for austenitic steel which indicates the group of steel and a digit which indicates a range of Chemical compositions within this steel group. The designation of the property class (second block) consists of two digits representing l/lO of the minim
31、um Vickers hardness and the Ietter H referring to hardness, see table 1. Table 1 -Designations of property classes in relation to Vickers hardness I Property class I 12H I 21H I / Vickers hardness, HV min. I 125 I 210 I EXAM PLE: Al-12H indicates: austenitic stainless steel, soft, minimum hardness 1
32、25 HV. 3) To be published. (Revision of ISO 262:1973) 4) To be published. (Revision of ISO 898-5:1980) 5) To be published. (Revision of ISO 965-3:1980) 6) To be published. (Revision of ISO 3651-1:1976) 7) To be published. (Revision of ISO 3651-2:1976) 2 ISO 3506-3: 1997(E) 1) 2) Steel group Austenit
33、ic i-l Steel grade” “1 Ap 1 /42) s The steel grades classified in figure 1 are described in the i composition in table 2. nformative annex A and specified by the Chemical Low carbsn stainless steels with carbon content not exceeding 0,03 % may additionally be marked with an L. Example: A4L - 21 H Fi
34、gure l- Designation System for stainless 3.2 Marking 3.2.1 Set screws Marking of set screws is not mandatory. el grades fasteners property classes Only if all requirements in this part designation System described in 3.1. of ISO 3506 are met, Parts shall be marked and/or described according to the s
35、crews and 3.2.2 Packages and containers Marking with the designation and manufacturers identification mark is mandatory on all packages of all sizes. 3.3 Finish Unless otherwise specified, fasteners in accordance with this part of ISO 3506 shall be supplied maximum corrosion resistance passivation i
36、s recommended. clean and bright. For 4 Chemical composition The ehe mical com given in table 2. positions of stainless steels suitable for fasteners in accordance with this patt of ISO 3506 are The final choice of Chemical composition within the specified steel grade is at the discretion of the manu
37、facturer unless by Prior agreement between the purchaser and the manufacturer. In applications where risk of intergranular corrosion is present, testing in accordance with ISO 3651-1 or ISO 3651-2 is recommended. In such cases, stabilized stainless steels A3 and A5 or stainless steels A2 and A4 with
38、 carbon content not exceeding 0,03 % are recommended. ISO 3506-3: 1997(E) Table 2 - Stainless steei grades - Chemicd composition Chemical composition NOTES 1 A description of the groups and grades of stainless steels also entering into their specific properties and application is given in annex A. 2
39、 Examples for stainless steels which are standardized in ISO 683-13 and in ISO 4954 are given in annexes B and C respectively. 1) Values are maximum unless otherwise indicated. 2) Sulfur may be replaced by selenium. 3) If the nicke1 content is below 8 %, the minimum manganese content must be 5 %. 4)
40、 There is no minimum limit to the topper content provided that the nicke1 content is greater than 8 %. 5) Molybdenum may be present at the discretion of the manufacturer. However, if for some applications limiting of the molybdenum content is essential, this must be stated at the time of ordering by
41、 the purchaser. 6) If the chromium content is below 17 %, the minimum nicke1 content should be 12 %. 7) For austenitic stainless steels having a maximum carbon content of 0,03 %, nitrogen may be present to a maximum of 0,22 %. 8) Must contain titanium Z= 5 x C up to 0,8 % maximum for stabilization a
42、nd be marked appropriately in accordance with this table, or must contain niobium (columbium) and/or tantalum 2 IO x C up to 1 % maximum for stabilization and be marked appropriately in accordance with this table. 9) At the discretion of the manufacturer the carbon content may be higher where requir
43、ed to obtain the specified mechanical proper-Ges at larger diameters but shall not exceed 0,12 %. 5 Mechanical properties The mechanical properties of set screws in accordance with this part of ISO 3506 shall conform to the values given in tables 3 and 4. For acceptance purposes the mechanical prope
44、r-Ges specified in 5.1 and 5.2 apply and shall be tested in accordance with 6.1 and 6.2 respectively. 5.1 Proof torque of hexagon socket set screws Hexagon socket set screws shall conform to the torque requirements given in table 3. ISO ISO 3506=3:1997(E) Table 3 - Proof torque requirements Nominal
45、thread Minimum lengthl) of set screws for test, mm Proof torque, Nm 5 I 6 I 8 I 8 I 6 I 1.7 l 2.8 1 6 8 IO 3 5 8 IO IO 12 IO 7 12 IO 12 12 16 12 14 24 . 1) The minimum lengths to be tested are the lengths below the dotted Iine in the product Standard, i.e. the lengths having the normal hexagon socke
46、t depth. 5.2 Hurdness Set screws shall conform to the hardness requirements given in table 4. Table 4 - Hardness Test method 12H Property class 21H Hardness I Vickers hardness HV I 125 to 209 1 210 min. I s Brinell hardness HB 123 to 213 214 min. I 4 Rockwell hardness HR5 70 to 95 96 min. + 6 Test m
47、ethods 6.1 Proof torque test for hexagon socket set screws The set screw shall be inserted in a Pest block as shown in figure 2 until the top surface of the screw face is flush with the test block and the Point bears on a firm base, for example a backing screw inserted from the other side. Using a h
48、exagon test bit with a tolerante of h9 for the width across flats, with a minimum width across corners equal to 1,13 smi, and a hardness of 50 HRC to 55 HRC, engaging the full depth of the set screw socket, the screw shall withstand the proof torque given in table 3 without splitting, cracking or th
49、read stripping. For this proof torque test, a calibrated torque measuring instrument shall be used. NOTE - Visual marks at the socket due to torque testing shall not be Cause for rejection. 5 ISO 3506-3: 1997(E) 1 Torque wrench 2 Screw under test 3 Test block minimum 50 HRC, tolerante 5H (ISO 965-3) for the internal thread 4 Backing screw 450 HV to 570 HV Figure 2 - Torque test equipment 6.2 Hardness test HB, HRB or HV for set screws The hardness test shall be carried out in accordance with ISO 6506 (HB), ISO 6508 (HRB), or ISO 6507-1 (HV). In case of doubt, the Vickers hardness t
