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 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 International Electrotechnical Commission (IEC) on 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 ISO 6931-1 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and alloy steels.
This second edition cancels and replaces the first edition (ISO 6931-1:1989), which has been technically revised.
ISO 6931 consists of the following parts, under the general title Stainless steels for springs:
— Part 1: Wire
— Part 2: Strip
Annex A of this part of ISO 6931 is for information only.
1 Scope
1.1 This part of ISO 6931 applies to the grades of wrought stainless steels listed in table 1, which are used in the work-hardened condition in the form of wire up to about 10 mm in diameter, for the production of springs and spring parts that are exposed to corrosive effects and sometimes slightly increased temperatures (see A.1 in annex A).
1.2 In addition to the steels listed in table 1, certain of the steel grades covered by ISO 683-13 are also used for springs, although to a much lesser extent. In these cases, the physical properties (tensile strength etc.) shall be agreed between user and supplier.
1.3 In addition to this part of ISO 6931, the general technical delivery requirements of ISO 404 are applicable.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 6931. 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 6931 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 377-1:1989, Selection and preparation of samples and test pieces of wrought steels — Part 1: Samples and test pieces for mechanical test.
ISO 377-2:1989, Selection and preparation of samples and test pieces of wrought steels — Part 2: Samples for the determination of the chemical composition.
ISO 404:1992, Steel and steel products — General technical delivery requirements.
ISO 683-13:1986, Heat-treatable steels, alloy steels and free-cutting steels — Part 13: Wrought stainless steels.
ISO 6892:1984, Metallic materials — Tensile testing.
ISO 7802:1983, Metallic materials — Wire — Wrapping test.
ISO/TR 9769:1991, Steel and iron — Review of available methods of analysis.
ISO 10474:1991, Steel and steel products — Inspection documents.
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