ISO 683-4:2016 熱処理鋼、合金鋼、快削鋼—パート4：快削鋼 | ページ 2

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 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.

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The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and alloy steels.

This second edition cancels and replaces the first edition (ISO 683-4:2014), of which it constitutes a minor revision.

ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy steels and free-cutting steels:

• Part 1: Non-alloy steels for quenching and tempering
• Part 2: Alloy steels for quenching and tempering
• Part 3: Case-hardening steels
• Part 4: Free-cutting steels
• Part 5: Nitriding steels
• Part 14: Hot-rolled steels for quenched and tempered springs
• Part 15: Valve steels for internal combustion engines
• Part 17: Ball and roller bearing steels
• Part 18: Bright steel products

1 Scope

This part of ISO 683 gives the technical delivery requirements for semi-finished products (e.g. blooms, billets, slabs), bars and wire rod, manufactured from the free-cutting steels listed in Table 2 and supplied in one of the treatment conditions given for the different types of products in Table 1, rows 2 to 4.

This part of ISO 683 covers three groups of free-cutting steels for mechanical purposes as listed in Table 2, namely

• a) not intended for heat treatment,
• b) suitable for case-hardening, and
• c) suitable for quenching and tempering.

Free-cutting steels are often used as bright bars. For these products, refer to ISO 683-18.

In special cases, variations in these technical delivery requirements or additions to them can form the subject of an agreement at the time of enquiry and order (see 5.2 and Annex B).

In addition to this part of ISO 683, the general technical delivery requirements of ISO 404 are applicable.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document 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.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2, ISO 6929, ISO 14284 and the following apply.

Bibliography