Tool steels (ISO 4957:2018)

This document specifies requirements for the following grades of wrought tool steels:
a) non-alloy cold-work tool steels;
b) alloy cold-work tool steels;
c) alloy hot-work tool steels;
d) high-speed tool steels.
If not stated otherwise, this document applies to all types of hot-rolled, forged, cold-drawn or cold-rolled products or products produced by powder metallurgy, which are supplied in one of the surface and heat-treatment conditions given in 6.2 and Table 1.
NOTE Tables 2, 4, 6 and 8 cover only those steels which have gained certain international importance, which does not mean, however, that they are available in all industrial countries. In addition, a number of other steels for tools are specified in regional, national or company standards.
Where the heat resistance of the tools is of particular importance, as for example in the case of tools for hot forming glass, the material selection is based on ISO 4955.

Werkzeugstähle (ISO 4957:2018)

Dieses Dokument legt die Anforderungen an folgende Sorten aus Werkzeugstahl fest:
a) unlegierte Kaltarbeitstähle;
b) legierte Kaltarbeitstähle;
c) legierte Warmarbeitstähle;
d) Schnellarbeitstähle.
Soweit nicht anders angegeben gilt dieses Dokument für alle Arten warmgewalzter, geschmiedeter, kaltgezogener oder mittels Pulvermetallurgie hergestellter Erzeugnisse, die in einem der in 6.2 und Tabelle 1 aufgeführten Oberflächen- und Wärmebehandlungszustände geliefert werden.
ANMERKUNG Die Tabellen 2, 4, 6 und 8 berücksichtigen nur solche Stähle, die eine gewisse internationale Bedeutung haben; das bedeutet jedoch nicht, dass sie in allen Industrieländern verfügbar sind. Zusätzlich ist eine Anzahl von Stählen für Werkzeuge in regionalen, nationalen oder Werksnormen spezifiziert.
Wenn die Hitzebeständigkeit der Werkzeuge von besondere Bedeutung ist, wie zum Beispiel bei Werkzeugen zum Warmumformen von Glas, basiert die Werkstoffauswahl auf ISO 4955 basieren.

Aciers à outils (ISO 4957:2018)

Le présent document spécifie les exigences concernant les nuances des aciers à outils corroyés suivants:
a) aciers à outils non alliés pour travail à froid;
b) aciers à outils alliés pour travail à froid;
c) aciers à outils alliés pour travail à chaud;
d) aciers rapides.
Sauf spécification contraire dans la suite, la présent document s'applique à tous les types de produits laminés à chaud ou à froid, forgés, ou étirés à froid ou aux produits fabriqués par la métallurgie des poudres et qui possèdent à la livraison l'un des états de surface et de traitement thermique spécifiés en 6.2 et dans le Tableau 1.
NOTE Les Tableaux 2, 4, 6 et 8 ne prennent en compte que les aciers qui ont acquis une certaine renommée internationale, ce qui ne signifie pas toutefois qu'ils soient disponibles dans tous les pays industriels. De plus, un certain nombre d'autres aciers à outils sont décrits dans des normes régionales, nationales ou d'entreprises.
Lorsque la résistance à la chaleur des outils est un facteur d'une importance particulière, comme par exemple dans le cas des outils pour le façonnage à chaud du verre, le choix du matériau est basé sur l'ISO 4955.

Orodna jekla (ISO 4957:2018)

Ta dokument določa zahteve za naslednje razrede kovanih orodnih jekel:
a) hladno obdelana orodna jekla, ki niso zlitine;
b) zlitine hladno obdelanih orodnih jekel;
c) zlitine vroče obdelanih orodnih jekel;
d) visoko hitrostna orodna jekla.
Ta dokument se uporablja za vse vrste vroče valjanih, kovanih, hladno vlečenih ali hladno valjanih proizvodov oziroma proizvodov, izdelanih z metalurgijo prahu, ki so podani v enem od pogojev površine in toplotne obdelave iz točke 6.2 in preglednice 1, razen če ni navedeno drugače.
OPOMBA: Preglednice 2, 4, 6 in 8 obravnavajo le tista jekla, ki so mednarodno nekoliko bolj pomembna, kar pa ne pomeni, da so na voljo v vseh industrijskih državah. Poleg tega so v regionalnih in nacionalnih standardih ali standardih za podjetja določena tudi številna druga orodna jekla.
Če je posebej pomembna toplotna odpornost orodij, npr. pri orodjih za vroče oblikovanje stekla, izbira materiala temelji na standardu ISO 4955.

General Information

Status
Published
Publication Date
17-Jul-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
18-Jul-2018
Completion Date
18-Jul-2018

RELATIONS

Effective Date
03-Feb-2016
Effective Date
01-Aug-2018

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SLOVENSKI STANDARD
SIST EN ISO 4957:2018
01-oktober-2018
1DGRPHãþD
SIST EN ISO 4957:2000
Orodna jekla (ISO 4957:2018)
Tool steels (ISO 4957:2018)
Werkzeugstähle (ISO 4957:2018)
Aciers à outils (ISO 4957:2018)
Ta slovenski standard je istoveten z: EN ISO 4957:2018
ICS:
77.140.35 Orodna jekla Tool steels
SIST EN ISO 4957:2018 en,fr,de

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

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SIST EN ISO 4957:2018
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SIST EN ISO 4957:2018
EN ISO 4957
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2018
EUROPÄISCHE NORM
ICS 77.140.35 Supersedes EN ISO 4957:1999
English Version
Tool steels (ISO 4957:2018)
Aciers à outils (ISO 4957:2018) Werkzeugstähle (ISO 4957:2018)
This European Standard was approved by CEN on 24 June 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 4957:2018 E

worldwide for CEN national Members.
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SIST EN ISO 4957:2018
EN ISO 4957:2018 (E)
Contents Page

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

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SIST EN ISO 4957:2018
EN ISO 4957:2018 (E)
European foreword

This document (EN ISO 4957:2018) has been prepared by Technical Committee ISO/TC 17 "Steel" in

collaboration with 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 January 2019, and conflicting national standards shall

be withdrawn at the latest by January 2019.

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 ISO 4957:1999.

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 4957:2018 has been approved by CEN as EN ISO 4957:2018 without any modification.

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SIST EN ISO 4957:2018
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SIST EN ISO 4957:2018
INTERNATIONAL ISO
STANDARD 4957
Third edition
2018-06
Tool steels
Aciers à outils
Reference number
ISO 4957:2018(E)
ISO 2018
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 4957:2018
ISO 4957:2018(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......................................................................................................................... 3

5.1 Mandatory information ................................................................................................................................................................... 3

5.2 Options ........................................................................................................................................................................................................... 3

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

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

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

6.2 Heat-treatment condition and surface condition on delivery ........................................................................ 4

6.2.1 General .................................................................................................................................................................................... 4

6.2.2 Heat-treatment condition ........................................................................................................................................ 4

6.2.3 Surface condition ............................................................................................................................................................. 4

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

7.1 General requirements ....................................................................................................................................................................... 4

7.2 Chemical composition and mechanical properties ................................................................................................. 4

7.3 Surface quality ......................................................................................................................................................................................... 4

7.4 Shape, dimensions and tolerances ......................................................................................................................................... 5

8 Inspection, testing and conformance of products.............................................................................................................. 5

8.1 Inspection and testing procedures and types of inspection documents ............................................... 5

8.2 Specific inspection and testing .................................................................................................................................................. 6

8.2.1 Number of sample products .................................................................................................................................. 6

8.2.2 Sampling.................................................................................................................................................................................. 6

8.2.3 Test methods ....................................................................................................................................................................... 6

8.2.4 Retests ....................................................................................................................................................................................... 6

8.2.5 Sorting and reprocessing .......................................................................................................................................... 7

9 Marking .......................................................................................................................................................................................................................... 7

10 Tables ............................................................................................................................................................................................................................... 7

11 Location of test pieces in the hardening test ......................................................................................................................17

11.1 Product diameter or thickness ≥ 15 mm .......................................................................................................................17

11.2 Product diameter or thickness < 15 mm .......................................................................................................................18

Annex A (informative) Hardness-tempering temperature curves......................................................................................19

Annex B (normative) Supplementary or special requirements ............................................................................................29

Annex C (informative) Designations of comparable steels .........................................................................................................31

Bibliography .............................................................................................................................................................................................................................33

© ISO 2018 – All rights reserved iii
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SIST EN ISO 4957:2018
ISO 4957:2018(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 voluntary nature of standards, 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.

This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat

treatable and alloy steels.

This third edition cancels and replaces the second edition (ISO 4957:1999), which has been technically

revised.
The main changes compared with the previous edition are as follows:
— the delivery condition normalized/normalized rolled has been introduced;
— for surface quality, ISO 9443 for bars and ISO 7788 for plates now apply;
— an additional clause for sorting and reprocessing has been introduced;
— the normative references have been updated.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 4957:2018
INTERNATIONAL STANDARD ISO 4957:2018(E)
Tool steels
1 Scope

This document specifies requirements for the following grades of wrought tool steels:

a) non-alloy cold-work tool steels;
b) alloy cold-work tool steels;
c) alloy hot-work tool steels;
d) high-speed tool steels.

If not stated otherwise, this document applies to all types of hot-rolled, forged, cold-drawn or cold-

rolled products or products produced by powder metallurgy, which are supplied in one of the surface

and heat-treatment conditions given in 6.2 and Table 1.

NOTE Tables 2, 4, 6 and 8 cover only those steels which have gained certain international importance, which

does not mean, however, that they are available in all industrial countries. In addition, a number of other steels

for tools are specified in regional, national or company standards.

Where the heat resistance of the tools is of particular importance, as for example in the case of tools for

hot forming glass, the material selection is based on ISO 4955.
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 1035-1, Hot-rolled steel bars — Part 1: Dimensions of round bars
ISO 1035-3, Hot-rolled steel bars — Part 3: Dimensions of flat bars
ISO 1035-4:1982, Hot-rolled steel bars — Part 4: Tolerances
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/TS 4949, Steel names based on letter symbols
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6929, Steel products — Vocabulary
ISO 7452:2013, Hot rolled steel plates — Tolerances on dimensions and shape

ISO 7788, Steel — Surface finish of hot-rolled plates and wide flats — Delivery requirements

ISO 9443, Surface quality classes for hot-rolled bars and wire rod
© ISO 2018 – All rights reserved 1
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
ISO/TR 9769, Steel and iron — Review of available methods of analysis
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 17577, Steel — Ultrasonic testing of steel flat products of thickness equal to or greater than 6 mm

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4885, ISO 4948-1 and ISO 6929

and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
tool steel

special steel suitable for working or processing of materials, for handling and measuring workpieces

and, for this purpose, exhibiting high hardness and wear resistance and/or toughness

3.2
cold-work tool steel

non-alloy or alloy tool steel (3.1) for applications in which the surface temperature is generally

below 200 °C
3.3
hot-work tool steel

alloy tool steel (3.1) for applications in which the surface temperature is generally over 200 °C

3.4
high-speed tool steel

steel used mainly for machining and for forming processes and which, because of the chemical

composition, has the highest high-temperature hardness and temper resistance up to about 600 °C

4 Classification and designation
4.1 Classification

The classification of the relevant steel grades shall be in accordance with ISO 4948-1.

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.
For information on designation of comparable steels, see Annex C.
2 © ISO 2018 – All rights reserved
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
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 product form (e.g. round bar);

c) either the dimensional standard and the dimensions and tolerances selected from it (see 7.4) or any

other document covering the dimensions and tolerances required for the product;
d) the reference to this document, i.e. ISO 4957;
e) the designation of the steel type (see Tables 2, 4, 6 and 8);

f) the symbol for the heat-treatment condition on delivery (see Table 1) and, if the products are to be

delivered in the quenched and tempered condition, the hardness values required;
g) the type of inspection document in accordance with ISO 10474.
5.2 Options

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 shall be supplied in accordance with the basic

specifications of this document (see 5.1):

a) if a surface condition other than “hot worked” or a special surface quality is required, the surface

condition (see 6.2.3) and the surface quality (see 7.3);

b) any supplementary requirement that shall be complied with, the symbol and, where necessary, the

details of this supplementary requirement (in accordance with Annex B).
5.3 Ordering example

EXAMPLE 2 t hot-rolled round bars in accordance with ISO 1035-1; with a nominal diameter of 30,0 mm;

with a nominal length of 4 000 mm; with a tolerance on diameter of ±0,30 mm (class S of ISO 1035-4:1982); with

a tolerance on length of +10 mm (class L2 of ISO 1035-4:1982); all other tolerances as given in ISO 1035-4 for

normal cases, surface as hot worked made of steel grade in accordance with this document, type X153CrMoV12

(see Table 4); heat-treatment condition: annealed (soft annealed) (symbol +A, see Table 1); with an inspection

certificate 3.1 (see ISO 10474).
2 t rounds ISO 1035-1 and -4 – 30,0 S x 4000 L2
Steel ISO 4957-X153CrMoV12+A
ISO 10474 – 3.1
6 Manufacturing process
6.1 General

The manufacturing process of the steel and the products is left to the discretion of the manufacturer,

with the restrictions given in 6.2. Upon request, the purchaser shall be informed what steel making

process is being used.
© ISO 2018 – All rights reserved 3
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
6.2 Heat-treatment condition and surface condition on delivery
6.2.1 General

The heat-treatment and surface conditions of the products shall comply with the agreements made at

the time of ordering.
6.2.2 Heat-treatment condition
The heat-treatment conditions are given in Table 1.

Unless otherwise specified in the order, the tool steels [except C45U (Table 2), 35CrMo7, X38CrMo16

and 40CrMnNiMo8-6-4 (Table 4), 55NiCrMoV7 (Table 6)] are delivered in the annealed condition.

6.2.3 Surface condition
Usual surface conditions are
a) the hot-rolled or forged condition (= as hot worked),
b) the machined (ground, polished, turned, peeled or milled) condition, and
c) the cold-reduced condition.

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

condition hot worked.
7 Requirements
7.1 General requirements

In addition to this document, the general technical delivery requirements of ISO 404 apply.

7.2 Chemical composition and mechanical properties

Table 1 gives a survey of combinations of usual heat-treatment conditions at delivery and requirements

according to Tables 2 to 9 (chemical composition, hardness).
For hardness-tempering temperature curves of the steels, see Annex A.

For hardness penetration depth of non-alloy cold-work tool steels, see Table 2, footnote c.

7.3 Surface quality

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

applied. Minor surface imperfections, which also may occur under normal manufacturing conditions,

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

Bars shall be delivered with surface class A in accordance with ISO 9443 unless otherwise agreed at

the time of enquiry and order. Plates shall be delivered in accordance with ISO 7788 unless otherwise

agreed at the time of enquiry and order.

7.3.2 Ground, polished or finished-machined products shall be free from surface imperfections and

surface decarburization.
4 © ISO 2018 – All rights reserved
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SIST EN ISO 4957:2018
ISO 4957:2018(E)

7.3.3 Hot-rolled, forged, cold-drawn or rough-machined products shall be ordered with sufficient

material to be removed from all surfaces by machining or grinding to allow for
a) surface decarburization, and
b) surface imperfections.

Providing no International Standard for the machining allowances of tool steels is available, the

allowances shall be agreed at the time of enquiry and order.
7.4 Shape, dimensions and tolerances

The shape, dimensions and tolerances of the products shall comply with the requirements agreed upon

at the time of enquiry and order. The agreements shall, as far as possible, be based on corresponding

International Standards or, otherwise, on suitable national standards.

For rolled flat and round bars, the following International Standards that cover dimensions and/or

tolerances for products included in this document shall apply: ISO 1035-1, ISO 1035-3 and ISO 1035-4.

For hot rolled plates ISO 7452:2013, Annex A class A shall apply if not otherwise agreed.

NOTE By agreement, the tolerances can be all plus or other disposition than equal plus/minus.

8 Inspection, testing and conformance of products
8.1 Inspection and testing procedures and types of inspection documents

8.1.1 Products complying with this document shall be ordered and delivered with one of the inspection

documents as specified in ISO 10474. The type of document shall be agreed upon at the time of enquiry

and order. If the order does not contain any specification of this type, a test report 2.2 shall be issued.

8.1.2 If, in accordance with the agreements made at the time of enquiry and order, a test report 2.2 is

to be provided, this shall cover

a) the statement that the material complies with the requirements of the order, and

b) the results of the cast analysis for all elements specified for the type of steel supplied.

8.1.3 If, in accordance with the agreements in the order, an inspection certificate 3.1 or 3.2 is to be

provided, the specific inspections and tests described in 8.2 shall be carried out and their results shall be

certified in the document.
In addition the document shall cover

a) the results of the cast analysis provided by the manufacturer for all elements specified for the steel

type concerned,

b) the results of all inspections and tests ordered by supplementary requirements (in accordance

with Annex B), and

c) the symbol letters of numbers connecting the inspection documents, the test pieces and products

to each other.
© ISO 2018 – All rights reserved 5
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
8.2 Specific inspection and testing
8.2.1 Number of sample products
8.2.1.1 Chemical composition
The cast analysis is given by the manufacturer. For product analysis, see B.2.
8.2.1.2 Mechanical properties
8.2.1.2.1 One sample product per test unit shall be tested.

8.2.1.2.2 For material delivered in the annealed or annealed and cold rolled or annealed and cold drawn

condition, the test unit shall consist of products from the same cast and the same heat-treatment batch.

In the case of material heat treated in a continuous furnace, a heat-treatment batch is regarded as the

quantity of products (of the same cast and dimensions) that, without any interruptions, underwent

constant treatment conditions (same furnace temperature, atmosphere and transportation speed)

through the furnace.

8.2.1.2.3 For material delivered in the quenched and tempered condition, the test unit shall consist of

products from the same cast, heat-treatment and thickness.

However, if the manufacturer verifies that the thickness has no significant effect on the hardness in the

quenched and tempered condition, then different thicknesses may be covered in a test unit.

In the case of material heat treated in a continuous furnace, a heat-treatment batch is regarded as the

quantity of products (of the same cast and dimensions) that, without any interruptions, underwent

constant treatment conditions (same furnace temperature, atmosphere and transportation speed)

through the furnace.
8.2.1.3 Inspection of the surface quality

Unless otherwise agreed when ordering (see B.5), the number of products to be inspected for surface

quality is left to the discretion of the manufacturer.
8.2.1.4 Dimensional inspection

Unless otherwise agreed when ordering (see B.6), the number of products to be inspected for their

shape and dimensions is left to the discretion of the manufacturer.
8.2.2 Sampling

The general conditions for selection and preparation of samples and test pieces shall be in accordance

with ISO 377 and ISO 14284.

For the Brinell hardness test, the surface of the sample product or of a test piece taken from the sample

product in the delivery condition shall be prepared in accordance with the requirements of ISO 6506-1.

8.2.3 Test methods
The Brinell hardness test shall be made in accordance with ISO 6506-1.

Unless otherwise agreed (see B.5), the surface quality shall be inspected visually.

8.2.4 Retests
For retests, ISO 404 shall apply.
6 © ISO 2018 – All rights reserved
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SIST EN ISO 4957:2018
ISO 4957:2018(E)
8.2.5 Sorting and reprocessing
For sorting and reprocessing, ISO 404 shall apply.
9 Marking
The manufacturer shall mark the products or the bundles or b
...

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