Heat-treatable steels, alloy steels and free-cutting steels - Part 4: Free-cutting steels (ISO 683-4:2016)

ISO 683-4:2016 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.
It 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 ISO 683-4:2016, the general technical delivery requirements of ISO 404 are applicable.

Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle - Teil 4: Automatenstähle (ISO 683-4:2016)

Dieser Teil der ISO 683 enthält die technischen Lieferbedingungen für Halbzeug (z. B. Vorblöcke, Knüppel
Brammen), Stäbe und Walzdraht, hergestellt aus Automatenstählen nach Tabelle 2, welche in einem der
Tabelle 1, Zeilen 2 bis 4 für die verschiedenen Erzeugnisformen angegebenen Wärmebehandlungszustand
geliefert werden.
Dieser Teil der ISO 683 enthält die im Folgenden aufgeführten drei Gruppen von Automatenstähle für
mechanische Anwendungen nach Tabelle 2:
a) nicht für eine Wärmebehandlung bestimmte Stähle,
b) Einsatzstähle und
c) Vergütungsstähle.
Automatenstähle werden häufig als Blankstäbe verwendet. Für diese Erzeugnisse ist Bezug auf die ISO 683-
18 zu nehmen.
In Sonderfällen können bei der Anfrage und Bestellung Abweichungen von oder Zusätze zu diesen
technischen Lieferbedingungen vereinbart werden (siehe 5.2 und Anhang B).
Zusätzlich zu diesem Teil der ISO 683 sind die allgemeinen technischen Lieferbedingungen nach ISO 404
anzuwenden.

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 4: Aciers pour décolletage (ISO 683-4:2016)

La présente partie de l'ISO 683 spécifie les conditions techniques de livraison des demi-produits (par exemple, blooms, billettes, brames), barres, fils machine, fabriqués à partir d'aciers de décolletage figurant dans le Tableau 2 et livrés dans l'un des états de traitement thermique donnés pour les différents types de produits dans le Tableau 1, lignes 2 à 4.
La présente partie de l'ISO 683 concerne trois familles d'aciers de décolletage à des fins mécaniques énumérées dans le Tableau 2, à savoir:
a) les aciers non destinés à un traitement thermique;
b) les aciers destinés à un traitement de trempe après cémentation, et;
c) les aciers destinés à un traitement de trempe et de revenu.
Les aciers de décolletage sont souvent utilisés sous forme de barres calibrées. Pour ces produits, voir l'ISO 683‑18.
Dans certains cas particuliers, il est possible de déroger aux présentes conditions techniques de livraison ou d'en ajouter d'autres, à condition d'en convenir au moment de l'appel d'offres et de la commande (voir 5.2 et Annexe B).
En plus de cette partie de l'ISO 683, les conditions générales techniques de livraison de l'ISO 404 sont applicables.

Toplotno obdelana, legirana in avtomatna jekla - 4. del: Avtomatna jekla (ISO 683-4:2016)

ISO 683-4:2016 podaja tehnične dobavne zahteve za polizdelke (npr. bloke, palice, plošče), drogove in valjane žice, izdelane iz avtomatnih jekel, navedenih v preglednici 2, in dobavljenih v enem od stanj obdelave, podanih za različne vrste izdelkov v preglednici 1, vrstice 2 do 4.
Zajema tri skupine avtomatnih jekel za mehanske namene, kot je navedeno v preglednici 2, in sicer
a) nenamenjene za toplotno obdelavo,
b) primerne za cementiranje ter
c) primerne za poboljšanje.
Avtomatna jekla se pogosto uporabljajo kot svetli drogovi. Za te izdelke glej ISO 683‑18.
V posebnih primerih so lahko različice teh splošnih tehničnih dobavnih zahtev ali dodatki k njim predmet sporazuma v času povpraševanja in naročila (glej točko 5.2 in dodatek B).
Poleg standarda ISO 683-4:2016 se uporabljajo tudi splošne tehnične dobavne zahteve standarda ISO 404.

General Information

Status
Published
Publication Date
19-Jun-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
20-Jun-2018
Completion Date
20-Jun-2018

RELATIONS

Buy Standard

Standard
EN ISO 683-4:2018
English language
29 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 683-4:2018
01-september-2018
1DGRPHãþD
SIST EN 10087:2000

Toplotno obdelana, legirana in avtomatna jekla - 4. del: Avtomatna jekla (ISO 683-

4:2016)

Heat treatable steels, alloy steels and free-cutting steels - Part 4: Free-cutting steels

(ISO 683-4:2016)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 4: Automatenstähle (ISO 683-4:2016)

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 4:

Aciers pour décolletage (ISO 683-4:2016)
Ta slovenski standard je istoveten z: EN ISO 683-4:2018
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.20 Visokokakovostna jekla Stainless steels
SIST EN ISO 683-4:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 683-4:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 683-4:2018
EN ISO 683-4
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2018
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.20 Supersedes EN 10087:1998
English Version
Heat-treatable steels, alloy steels and free-cutting steels -
Part 4: Free-cutting steels (ISO 683-4:2016)

Aciers pour traitement thermique, aciers alliés et Für eine Wärmebehandlung bestimmte Stähle, legierte

aciers pour décolletage - Partie 4: Aciers pour Stähle und Automatenstähle - Teil 4: Automatenstähle

décolletage (ISO 683-4:2016) (ISO 683-4:2016)
This European Standard was approved by CEN on 18 May 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 683-4:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)
European foreword

The text of ISO 683-4:2016 has been prepared by Technical Committee ISO/TC 17 “Steel” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 683-4:2018 by

Technical Committee ECISS/TC 105 “Steels for heat treatment, alloy steels, free-cutting steels and

stainless steels” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by December 2018, and conflicting national standards

shall be withdrawn at the latest by December 2018.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 10087:1998.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 683-4:2016 has been approved by CEN as EN ISO 683-4:2018 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)

The European steel numbers to the steel grades are to be found in informative Annex C. Some European

steel numbers were not available at the publication of this International standard, for this reason they

are given now below.
Steel 9S20 17SMn20 35SMn20 35SMnPb20
name
Steel 1.0721 1.0735 1.0766 1.0767
number
The references to following European standards are given for information:
EN 10017, Steels rod for drawing and/or cold rolling – Dimensions and tolerances
EN 10021, General technical delivery conditions for steel products

EN 10058, Hot rolled flat steel bars for general purposes – Dimensions and tolerances on shape and

dimensions

EN 10059, Hot rolled square steel bars for general purposes – Dimensions and tolerances on shape and

dimensions

EN 10060, Hot rolled round steel bars - Dimensions and tolerances on shape and dimensions

EN 10061, Hot rolled hexagon steel bars – Dimensions and tolerances on shape and dimensions

EN 10204, Metallic products – Types of inspection documents
EN 10308, Non-destructive testing – Ultrasonic testing of steel bars
---------------------- Page: 6 ----------------------
SIST EN ISO 683-4:2018
INTERNATIONAL ISO
STANDARD 683-4
Second edition
2016-07-15
Heat-treatable steels, alloy steels and
free-cutting steels —
Part 4:
Free-cutting steels
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 4: Aciers pour décolletage
Reference number
ISO 683-4:2016(E)
ISO 2016
---------------------- Page: 7 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All 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 from either ISO at the address below or ISO’s 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
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Classification and designation ............................................................................................................................................................... 2

4.1 Classification ............................................................................................................................................................................................. 2

4.2 Designation ................................................................................................................................................................................................ 2

5 Information to be supplied by the purchaser......................................................................................................................... 2

5.1 Mandatory information ................................................................................................................................................................... 2

5.2 Options/supplementary or special requirements.................................................................................................... 3

5.3 Ordering example ................................................................................................................................................................................. 3

6 Manufacturing process .................................................................................................................................................................................. 3

6.1 General ........................................................................................................................................................................................................... 3

6.2 Heat treatment and surface condition at delivery .................................................................................................... 3

6.2.1 Normal condition at delivery ................................................................................................................................ 3

6.2.2 Particular heat-treatment condition .................. ............................................................................................. 3

6.3 Traceability of the cast ..................................................................................................................................................................... 3

7 Requirements .......................................................................................................................................................................................................... 4

7.1 Chemical composition, hardness, and mechanical properties ...................................................................... 4

7.1.1 General...................................................................................................................................................................................... 4

7.1.2 Chemical composition ................................................................................................................................................. 4

7.1.3 Mechanical properties ................................................................................................................................................ 4

7.2 Machinability ............................................................................................................................................................................................ 4

7.3 Weldability .................................................................................................................................................................................................. 4

7.4 Grain size ...................................................................................................................................................................................................... 4

7.5 Internal soundness .............................................................................................................................................................................. 4

7.6 Surface quality ......................................................................................................................................................................................... 5

7.7 Shape, dimensions, and tolerances ........................................................................................................................................ 5

8 Inspection .................................................................................................................................................................................................................... 5

8.1 Testing procedures and types of documents ................................................................................................................ 5

8.2 Frequency of testing ........................................................................................................................................................................... 6

8.3 Specific inspection and testing .................................................................................................................................................. 6

8.3.1 Verification of the hardness and mechanical properties .............................................................. 6

8.3.2 Visual and dimensional inspection .................................................................................................................. 6

9 Test methods ............................................................................................................................................................................................................. 6

9.1 Chemical analysis .................................................................................................................................................................................. 6

9.2 Hardness and mechanical tests ................................................................................................................................................ 6

9.2.1 Hardness ................................................................................................................................................................................. 6

9.2.2 Mechanical tests ............................................................................................................................................................... 6

9.3 Retests ............................................................................................................................................................................................................ 6

10 Marking .......................................................................................................................................................................................................................... 7

Annex A (normative) Ruling sections for mechanical properties .......................................................................................14

Annex B (normative) Supplementary or special requirements ............................................................................................17

Annex C (informative) Designation of steels given in this part of ISO 683 and of comparable

grades covered in various designation systems................................................................................................................19

Annex D (informative) Dimensional standards applicable to products complying with this

part of ISO 683 .....................................................................................................................................................................................................20

Bibliography .............................................................................................................................................................................................................................21

© ISO 2016 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(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 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.

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 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 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 information 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 ISO’s adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.

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
iv © ISO 2016 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 683-4:2018
INTERNATIONAL STANDARD ISO 683-4:2016(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 4:
Free-cutting steels
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.

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 643, Steels — Micrographic determination of the apparent grain size
ISO 4885, Ferrous products — 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
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 6929, Steel products — Vocabulary

ISO 9443, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire

rods — Technical delivery conditions
© ISO 2016 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
ISO 10474, Steel and steel products — Inspection documents

ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO/TS 4949, Steel names based on letter symbols
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.
3.1
ruling section
section for which the specified mechanical properties shall apply

Note 1 to entry: Independent of the actual shape and dimensions of the cross-section of the product, the size of its

ruling section is always given by a diameter. This corresponds to the diameter of an “equivalent round bar”. That

is a round bar which will show the same cooling rate as the actual ruling section of the product concerned at its

position for taking the test pieces, when being cooled from austenitizing temperature.

3.2
free-cutting steels

steels characterized by good machinability with high metal removal rate, mostly obtained by higher

than normal contents of sulphur

Note 1 to entry: Other elements besides sulfur can be added for further improving the machinability.

4 Classification and designation
4.1 Classification

The classification of the relevant steel grades is allocated in accordance with ISO 4948-1 and ISO 4948-2.

All steels covered by this part of ISO 683 are classified as non-alloy quality steels.

4.2 Designation

For the steel grades covered by this part of ISO 683, the steel names given in the relevant tables are

allocated in accordance with ISO/TS 4949.
5 Information to be supplied by the purchaser
5.1 Mandatory information

The manufacturer shall obtain the following information from the purchaser at the time of enquiry

and order:
a) the quantity to be delivered;

b) the designation of the product form (e.g. slab, bloom, billet, round bar, wire rod);

c) either the designation of the dimensional standard and the dimensions and tolerances selected from

this (see 7.7) or the designation of the drawing or any other document, covering the dimensions

and tolerances required for the product;
d) a reference to this part of ISO 683, i.e. ISO 683-4;
2 © ISO 2016 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
e) the designation of the steel grade given in Table 2;

f) standard designation for a test report 2.2 or, if required, any other type of inspection document in

accordance with ISO 10474.
5.2 Options/supplementary or special requirements

A number of options are specified in this part of ISO 683 and listed below. If the purchaser does not

indicate the wish to implement any of these options, the products will be supplied in accordance with

the basic specification of this part of ISO 683 (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) Any supplementary requirement that shall comply with the symbol and, where necessary, the

details of this supplementary requirement (see Annex B).
c) Suitability of bars and rod for bright drawing (see 7.6.4).
d) Any requirement relating to removal of surface defects (see 7.6.5).
5.3 Ordering example

EXAMPLE 50 hot-rolled round bars according to ISO 1035-1, with a nominal diameter of 40 mm and a

nominal length of 8 000 mm, with diameter tolerance according to class S and with length tolerance according to

ISO 1035-4, class L2, made of steel grade ISO 683-4, 35S20 (see Table 2) in the heat-treatment condition +U (see

Table 1), product analysis/option (see B.5) with a test report 2.2 in accordance with ISO 10474.

50 round bars ISO 1035 – 40,0S × 8 000L2
steel grade ISO 683-4 – 35S20 option B.5
Inspection document ISO 10474 – 2.2
6 Manufacturing process
6.1 General

The manufacturing process of the steel and of the products is, with the restrictions given by the

requirements in 6.2 and 6.3, left to the discretion of the manufacturer.

For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products,

see B.6.
6.2 Heat treatment and surface condition at delivery
6.2.1 Normal condition at delivery

Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the

untreated condition that means “as hot-worked”.
6.2.2 Particular heat-treatment condition

If so agreed at the time of enquiry and order, the products shall be delivered in one of the particular

heat-treatment conditions given in Table 1, rows 3 and 4.
6.3 Traceability of the cast
Each product shall be traceable to the cast (see Clause 10).
© ISO 2016 – All rights reserved 3
---------------------- Page: 13 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
7 Requirements
7.1 Chemical composition, hardness, and mechanical properties
7.1.1 General

Table 1 gives a survey of combinations of usual treatment conditions at delivery, product forms, and

requirements according to Tables 2 to 6 (chemical composition, maximum hardness, mechanical

properties).
7.1.2 Chemical composition

The chemical composition determined by cast analysis shall comply with the values in Table 2.

Permissible deviations between the limiting values for cast analysis and the values for product analysis

are given in Table 3.

The product analysis shall be carried out when specified at the time of the enquiry and order (see B.5).

WARNING — Due to hazardous effects to health and environmental problems of Pb, it is

recommended to instead use steels only with sulfur and other innocuous free-cutting element

additions.
7.1.3 Mechanical properties
Mechanical properties for free-cutting steels are given in Tables 4 to 6.
7.2 Machinability

The steels covered by this part of ISO 683 have good machinability and chip-breaking characteristics.

However, the machinability decreases with increasing carbon, silicon and manganese contents, while

cold reduction improves the machinability of the steels not intended for heat treatment and steel 10S20.

NOTE Non-leaded steels with comparable chemical composition generally have identical mechanical

properties, but often lower machinability than leaded steels.
7.3 Weldability

Because of their high sulfur and phosphorus content, free-cutting steels are normally not recommended

for welding.
7.4 Grain size

Unless otherwise agreed at the time of enquiry and order, the grain size shall be left to the discretion of

the manufacturer. If a fine grain structure is required for case-hardening steels or steels for quenching

and tempering, the special requirement in B.3 shall be ordered.

If direct hardening treatment is used for case-hardening steels, a fine grain structure should be ordered.

7.5 Internal soundness

Where appropriate, requirements relating to the internal soundness of the products shall be agreed at

the time of enquiry and order (see B.4).
4 © ISO 2016 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 683-4:2018
ISO 683-4:2016(E)
7.6 Surface quality

7.6.1 All products shall have a smooth surface finish appropriate to the manufacturing processes

applied.

7.6.2 Minor surface imperfections, which can occur under normal manufacturing conditions, such as

prints originating from rolled-in scale, are not to be regarded as defects.

7.6.3 Bars and wire rod are delivered with surface class 1za2 according to ISO 9443, unless otherwise

agreed at the time of enquiry and order.

It is more difficult to detect and eliminate surface discontinuities in coiled products than in cut lengths.

This should be taken into account when agreements on surface quality are made.

7.6.4 If suitability of bars and rod for bright drawing is required, this shall be agreed at the time of

enquiry and order.
7.6.5 The removal of surface defects by welding is not permitted.

If surface discontinuities are repaired, the method and maximum depth of removal shall be agreed at

the time of enquiry and order.
7.7 Shape, dimensions, and tolerances
The shape, di
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.