ISO 683-3:2022 pdf download.Heat-treatable steels, alloy steels and free-cutting steels — Part 3: Case-hardening steels
This document specifies the technical delivery requirements for
— semi-finished products, hot formed (e.g. blooms, billets, slabs) (see NOTE 1),— bars (see NOTE 1),
— wire rod,
— finished flat products, and
— hammer or drop forgings (see NOTE 1)
manufactured from the case-hardening non-alloy or alloy steels listed in Table 3 and supplied in one of the heat-treatment conditions given for the different types of products in Table 1 and in one of the surface conditions given in Table 2.
The steels are, in general, intended for the manufacture of case-hardened machine parts.
NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammerforged bars are covered under semi-finished products or bars and not under the term “hammer and drop forgings”.
NOTE 2 For International Standards relating to steels conforming with the requirements for the chemical composition in Table 3, however, supplied in other product forms or treatment conditions than given above or intended for special applications, and for other related International Standards, see the Bibliography.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
ISO 404, Steel and steel products — General technical delivery requirements
ISO 642:1999, Steel — Hardenability test by end quenching (Jominy test)
ISO 643, Steels — Micrographic determination of the apparent grain size
ISO 4885, Ferrous materials — Heat treatments — Vocabulary
ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based on chemical composition
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main quality classes and main property or application characteristics
4.2 Designation
For the steel grades covered by this document, the steel names as given in the relevant tables shall be allocated in accordance with ISO/TS 4949.
A comparison between the designation of steels given in this document with various designation systems is given in Annex B.
5 Information to be supplied by the purchaser
5.1 Mandatory information
The following information shall be supplied by the purchaser at the time of enquiry and order:
a) quantity to be delivered;
b) designation of the product form (slab, bloom, billet, round bar, square or hexagonal bar, wire rod,wide flats, sheet, plate, strip, forging, etc.);
c) either the designation of the dimensional standard(s) and the dimensions and tolerances selected from this or these (see 7.8) or, for example, in the case of drop forgings, the designation of the drawing or any other document covering the dimensions and tolerances required for the product;
d) a reference to this document, i.e. ISO 683-3;
e) the designation of the steel type given in Table 3;
f) standard designation for a test report 2.2 or, if required, any other type of inspection document in accordance with ISO 10474 or another equivalent standard, e.g. EN 10204 or JIS G 0415.
5.2 Options and/or supplementary or special requirements
A number of options are specified in this document and listed below. If the purchaser does not indicate the wish to implement any of these options, the products are supplied in accordance with the basic specifications of this document (see 5.1):
a) if a heat-treatment condition other than the untreated condition is required, the symbol for this other condition (see Table 1, column 2);
b) if a surface condition other than “hot worked” or a special surface quality is required, the surface condition (see Table 2) and the surface quality (see 7.7.3);
c) any requirement for restricted hardenability scatter bands for alloy steels (+HH, +HL; see 7.1.1,Table 6 and Figure 1);
d) if any supplementary requirement shall be complied with, the symbol and, where necessary, the details of this supplementary requirement in accordance with Annex A;
e) any requirement for the verification of non-metallic inclusion content (see 7.5);
f) verification of hardenability and, if agreed, the information about calculation of the hardenability (see 9.2.2);
g) any requirement concerning suitability of bars and rod for bright drawing (see 7.7.4);
h) any requirement relating to removal of surface defects (see 7.7.5).ISO 683-3 pdf download.ISO 683-3 pdf download
