Determination of the physical and mechanical properties of steels using models

This document specifies the method for the verification and validation of models for the determination of the property data of steels. It is applicable where modelling of mechanical or physical properties is used to substitute conventional testing for specific inspection. Models can
be based on statistical data, thermo-physical data or indirect measurement (e.g. measurement of magnetic or ultrasonic data).
This document applies only for verification and validation of models for providing the properties of rolled or heat treated products such as plates, sheets, strip, sections, bars, etc.
This document is used to demonstrate the ability of the model to supply property data which is equivalent to data, which is measured by conventional testing.
NOTE: Validation of models is part of auditing the quality management system performed by an independent body.

Berechnungsmodell für die Datenbereitstellung von physikalischen und mechanischen Eigenschaften für Stähle

Dieses Dokument legt die Methode zur Überprüfung von Modellen für die Bestimmung der Eigenschaftsdaten von Stählen und die Überprüfung des Modellierungsprozesses fest.  Es ist anwendbar, wenn die Modellierung mechanischer oder physikalischer Eigenschaften verwendet wird, um konventionelle Prüfungen für spezifische Inspektionen zu ersetzen. Die Modelle können sich auf statistischen Daten, thermophysikalischen Daten oder indirekten Messungen (z. B. Messungen magnetischer oder Ultraschalldaten) oder einer Kombination dieser Verfahren basieren.
Dieses Dokument gilt nur für die Bereitstellung der Eigenschaften von gewalzten und/oder wärmebehandelten Produkten wie Blechen, Bändern, Profilen, Stäben.
Dieses Dokument wird verwendet, um zu beweisen, dass das Modell dafür geeignet ist, Eigenschaftsdaten zu liefern, welche mit den durch herkömmliche Prüfungen gemessenen Daten, äquivalent sind.
Selbstlernende Systeme sind vom Anwendungsbereich ausgeschlossen.
ANMERKUNG   Ein selbstlernendes Modell ist ein Modell, welches seine internen Parameter selbst ändert.

Détermination des propriétés physiques et mécaniques des aciers à l'aide de modèles

Le présent document spécifie la méthode de vérification des modèles pour déterminer les données de propriétés des aciers et valider le processus de modélisation. Il est applicable lorsque la modélisation des propriétés physiques ou mécaniques sert à remplacer les essais conventionnels par des contrôles spécifiques. Les modèles peuvent être fondés sur des données statistiques, des données thermophysiques ou des mesures indirectes (par exemple, la mesure de données magnétiques ou ultrasonores), ou une combinaison de ces méthodes.
Le présent document s'applique uniquement à la détermination des propriétés des produits laminés et/ou traités thermiquement tels que les tôles, les bandes, les profilés et les barres.
Le présent document permet de démontrer la capacité du modèle à fournir des données de propriétés équivalentes aux données mesurées par des essais conventionnels.
Tout système d'autoapprentissage est exclu du domaine d'application.
NOTE   Un modèle d'autoapprentissage est un modèle qui modifie ses paramètres internes par lui-même.

Ugotavljanje fizikalnih in mehanskih lastnosti jekel z uporabo modelov

General Information

Status
Published
Public Enquiry End Date
29-Feb-2020
Publication Date
20-Jul-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2021
Due Date
05-Sep-2021
Completion Date
21-Jul-2021

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SLOVENSKI STANDARD
SIST EN 10373:2021
01-september-2021
Ugotavljanje fizikalnih in mehanskih lastnosti jekel z uporabo modelov
Determination of the physical and mechanical properties of steels using models

Berechnungsmodell für die Datenbereitstellung von physikalischen und mechanischen

Eigenschaften für Stähle

Détermination des propriétés physiques et mécaniques des aciers à l'aide de modèles

Ta slovenski standard je istoveten z: EN 10373:2021
ICS:
77.080.20 Jekla Steels
SIST EN 10373:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 10373:2021
---------------------- Page: 2 ----------------------
SIST EN 10373:2021
EN 10373
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2021
EUROPÄISCHE NORM
ICS 77.080.20; 77.140.01
English Version
Determination of the physical and mechanical properties
of steels using models

Détermination des propriétés physiques et mécaniques Ermittlung physikalischer und mechanischer

des aciers à l'aide de modèles Eigenschaften von Stählen mittels Anwendung von
Modellen
This European Standard was approved by CEN on 23 May 2021.

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

Poland, Portugal, Republic of North Macedonia, 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10373:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Requirements on the application of models ......................................................................................... 6

4.1 General ................................................................................................................................................................ 6

4.2 Application range ............................................................................................................................................ 7

4.3 Requirements on input data ....................................................................................................................... 8

4.4 Requirements on output data ..................................................................................................................... 8

5 Requirements on model verification and application ....................................................................... 8

5.1 General ................................................................................................................................................................ 8

5.2 Model verification ........................................................................................................................................ 10

5.3 Modelling process validation ................................................................................................................... 10

5.4 Details of the assessment procedure for model verification ....................................................... 10

6 Requirements on monitoring of models .............................................................................................. 11

6.1 General ............................................................................................................................................................. 11

6.2 Monitoring of models .................................................................................................................................. 11

6.3 Deviation of output data from conventional testing ....................................................................... 12

6.4 Statistical methods for control and monitoring of models ........................................................... 13

7 Specific requirements on quality management ................................................................................ 13

7.1 General ............................................................................................................................................................. 13

7.2 Responsibilities and qualification of employees .............................................................................. 13

7.3 Measuring and testing equipment ......................................................................................................... 13

7.4 Handling of data ............................................................................................................................................ 14

7.5 Documentation .............................................................................................................................................. 14

7.6 Case of dispute............................................................................................................................................... 14

Annex A (informative) Example of a model for calculation of tensile strength in rolling

direction .......................................................................................................................................................... 15

Annex B (informative) Illustration of model verification ........................................................................... 16

Annex C (informative) Example of a template for predicted properties .............................................. 18

Bibliography ................................................................................................................................................................. 19

---------------------- Page: 4 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
European foreword

This document (EN 10373:2021) has been prepared by Technical Committee CEN/TC 459 SC 12 “General

issues”, the secretariat of which is held by BSI.

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 2021, and conflicting national standards shall

be withdrawn at the latest by December 2021.

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.

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

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

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
Introduction

Since the physical and mechanical properties of steels are ultimately based upon the metallurgical

transformations during the production process, there have been numerous efforts of the manufacturers

in the past, to design models for providing property data for the whole product, in order to improve the

control of the increasingly complex processes during the manufacturing of steel products.

In doing so, the use of models not only helps to reduce the amount of testing in the scope of factory

production control, but it gives a more representative overview of the material properties of steels, since

models can use all available data, determined during the production process, whereas conventional

material testing represents in principle a spot check of the material properties at the time of sampling

and at the place where the samples were taken.
---------------------- Page: 6 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
1 Scope

This document specifies the method for the verification of models for the determination of the property

data of steels and the validation of the modelling process. It is applicable where modelling of mechanical

or physical properties is used to substitute conventional testing for specific inspection. Models can be

based on statistical data, thermo-physical data or indirect measurement (e.g. measurement of magnetic

or ultrasonic data), or a combination of these methods.

This document applies only for providing the properties of rolled and/or heat-treated products such as

plates, sheets, strip, sections and bars.

This document is used to demonstrate the ability of the model to supply property data which is equivalent

to data, measured by conventional testing.
Any self-learning system is excluded from the scope.

NOTE A self-learning, in the spirit of an auto-adaptive model, is a model which changes its internal parameters

by itself.
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.

EN 10021, General technical delivery conditions for steel products
EN 10204, Metallic products - Types of inspection documents

NOTE At the time of the first release of this standard, no publications concerning statistical analyses of

manufacturing processes and/or statistical methods have been identified, which could have been cited as normative

references in this document. The bibliography contains references to technical literature, which can be taken into

account.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 https://www.electropedia.org/
3.1
model
documented system for the generation of output data using input data

Note 1 to entry: A unique set of input values to the model will always result in the same calculated output

value(s).

Note 2 to entry: The model calculates physical and/or mechanical property data from input data, the results of

which can also be determined by physical and/or mechanical testing.

Note 3 to entry: An example of a linear model for calculation of tensile strength is given in Annex A.

---------------------- Page: 7 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
3.2
input data

measurement data, or data which is related to those parts of a manufacturing process, which are relevant

to the product properties to be calculated
3.3
output data

physical and/or mechanical property data of a steel product according to the scope, which is generated

by a model according to 3.1
3.4
manufacturing process

entirety of all process steps (including all time periods between them), that leads from a starting product

(e.g. raw material, or a semi-finished product) to an end product
3.5
model verification

documented system of initial comparative testing and analysis procedures, carried out by the

manufacturer, proving the ability of a model to replace conventional testing of product properties by

output data

Note 1 to entry: An example for a model verification with sampling size n = 6 is given in Annex B.

3.6
modelling process validation

validation of the process by which the applicability and accuracy of models for prediction of specified

properties is confirmed by an independent body
3.7
model monitoring

documented system of regular checks, using data analysis procedures of input and output data, part of

the modelling process, as well as regular comparative testing, to ensure the accuracy and reliability of

modelled product properties
3.8
application range

range of steel products, chemical composition, manufacturing conditions and all additional conditions

affecting the model accuracy for which the model has been verified
4 Requirements on the application of models
4.1 General

Models can be based on direct measurement data (thermo-physical data), indirect measurement data

(e.g. measurement of magnetic or ultrasonic data), statistical data generated from indirect and/or direct

measurement data, or a combination of these methods.

The output data, determined by models, shall be equivalent to the results of conventional testing, within

the limits of allowable deviations, distinctively specified for each physical and mechanical property. To

define the allowable deviations is under the responsibility of the manufacturer.
Models shall be validated before they can be used for the release of products.
---------------------- Page: 8 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
4.2 Application range
4.2.1 General

Models for determination of property data are intended to be used for quality control in the production

process of steel products with specified physical properties, which are documented in standards or other

specifications and which can be alternatively determined by physical testing.

The application range of the model shall be described and documented in reference to the steel products,

in terms of chemical composition and manufacturing conditions and all additional conditions, that have

an influence on the model accuracy, and for which the model has been verified.
4.2.2 Conditions for the application of models
The following restrictions shall apply to models:

a) Manufacturing processes shall run under control of a quality management system and shall produce

input data, representative for the products and in a sufficient amount to apply appropriate

documented statistical methods in the scope of the control and monitoring of models according to

Clause 6 (e.g. large scale production).

NOTE Quality management systems in accordance with EN ISO 9001, or comparable systems, meet this

requirement.

b) The application range of a model shall be explicitly defined and documented with respect to the

considered products.

c) The model outputs shall only be used for product release if the model is used within the application

range.

d) Determination of physical and/or mechanical properties by a model shall be in accordance to the

requirements of a written specification (e.g. national, or international standards, or other

appropriate technical documentation).

e) For certain inspection types according to EN 10204 only input data, which can be related explicitly

to the test unit according to the applicable written specification or product standard shall be used.

f) The modelling process shall have been validated by an independent body before any initial

application of any model according to Clause 5 of this document.
4.2.3 Conditions for extension of the application range of models

An extension can only be considered if the model itself, including any internal parameter, does not

change.

Any extension of the application range which requires modification of the model or its internal

parameters shall be treated as a new model.

In case of the extension of the application range of a model for the determination of physical and

mechanical properties of steels, it shall be ensured, that:

a) the extension of the application range of a model is explicitly defined and documented in terms given

in 4.2.2;

b) the application of the extended model is in accordance with the conditions of 4.2.2;

c) the validation according to Clause 5 of this document has been repeated for the extended application

range of the model, prior to its regular use (e.g. for the manufacturers factory production control).

---------------------- Page: 9 ----------------------
SIST EN 10373:2021
EN 10373:2021 (E)
4.3 Requirements on input data
4.3.1 General

For all measured input data, indispensable for the application of a model, the measurement methods shall

be in accordance with accepted national or international standards or written internal documentation.

NOTE 1 Input data can also be data from another model, which describes an earlier process step.

NOTE 2 An example is given in Annex C.
4.3.2 Measurement equipment

All measurement equipment shall be uniquely identified and documented with respect to their positions

in the manufacturing process, or parts thereof.

The unit of measurement, the accuracy and the range of valid results for each measured input shall be

specified by the manufacturer.
4.3.3 Measurement methods

For the measurement of input data, appropriate direct or indirect measurement methods shall be applied.

The fundamentals of metrology, as well as the requirements for the analysis of measured parameters and

of measurement uncertainties, shall be given by appropriate national or international standards. When

non-standardized metrology method
...

SLOVENSKI STANDARD
oSIST prEN 10373:2020
01-februar-2020
Ugotavljanje fizikalnih in mehanskih lastnosti jekel z uporabo modelov
Determination of the physical and mechanical properties of steels using models

Berechnungsmodell für die Datenbereitstellung von physikalischen und mechanischen

Eigenschaften für Stähle

Détermination des propriétés physiques et mécaniques des aciers à l'aide de modèles

Ta slovenski standard je istoveten z: prEN 10373
ICS:
77.080.20 Jekla Steels
oSIST prEN 10373:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 10373:2020
---------------------- Page: 2 ----------------------
oSIST prEN 10373:2020
DRAFT
EUROPEAN STANDARD
prEN 10373
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2019
ICS 77.080.20; 77.140.01
English Version
Determination of the physical and mechanical properties
of steels using models

Détermination des propriétés physiques et mécaniques Berechnungsmodell für die Datenbereitstellung von

des aciers à l'aide de modèles physikalischen und mechanischen Eigenschaften für
Stähle

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 459/SC 12.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10373:2019 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Requirements on the application of models ......................................................................................... 6

4.1 General ................................................................................................................................................................ 6

4.2 Application range ............................................................................................................................................ 7

4.3 Requirements on input data ....................................................................................................................... 8

4.4 Requirements on output data ..................................................................................................................... 8

5 Requirements on model verification and application ....................................................................... 8

5.1 General ................................................................................................................................................................ 8

5.2 Model verification ........................................................................................................................................ 10

5.3 Modelling process validation ................................................................................................................... 10

5.4 Details of the assessment procedure for model verification ....................................................... 11

6 Requirements on monitoring of models .............................................................................................. 11

6.1 General ............................................................................................................................................................. 11

6.2 Monitoring of models .................................................................................................................................. 11

6.3 Deviation of output data from conventional testing ....................................................................... 12

6.4 Statistical methods for control and monitoring of models ........................................................... 13

7 Specific requirements on quality management ................................................................................ 13

7.1 General ............................................................................................................................................................. 13

7.2 Responsibilities and qualification of employees .............................................................................. 13

7.3 Measuring and testing equipment ......................................................................................................... 13

7.4 Handling of data ............................................................................................................................................ 14

7.5 Documentation .............................................................................................................................................. 14

7.6 Case of dispute............................................................................................................................................... 14

Bibliography ................................................................................................................................................................. 15

---------------------- Page: 4 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
European foreword

This document (prEN 10373:2019) has been prepared by Technical Committee CEN/TC 459 SC 12

“General issues”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
---------------------- Page: 5 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
Introduction
[Cited from proposals of CEN TC 459/SC 3/WG 2]

Since the physical and mechanical properties of steels are ultimately based upon the metallurgical

transformations during the production process, there have been numerous efforts of the manufacturers

in the past, to design models for providing property data for the whole product, in order to improve the

control of the increasingly complex processes during the manufacturing of steel products.

In doing so, the use of models not only helps to reduce the amount of testing in the scope of factory

production control, but it gives a more representative overview of the material properties of steels, since

models can use all available data, determined during the production process, whereas conventional

material testing represents in principle a spot check of the material properties at the time of sampling

and at the place where the samples were taken.
---------------------- Page: 6 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
1 Scope

This document specifies the method for the verification of models for the determination of the property

data of steels and the validation of the modelling process. It is applicable where modelling of mechanical

or physical properties is used to substitute conventional testing for specific inspection. Models can be

based on statistical data, thermo-physical data or indirect measurement (e.g. measurement of magnetic

or ultrasonic data), or a combination of these methods.

This document applies only for providing the properties of rolled and/or heat-treated products such as

plates, sheets, strip, sections and bars.

This document is used to demonstrate the ability of the model to supply property data which is equivalent

to data, measured by conventional testing.
Any self-learning system is excluded from the scope.

NOTE A self-learning model is a model which changes its internal parameters by itself.

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.

EN 10021, General technical delivery conditions for steel products
EN 10204, Metallic products - Types of inspection documents

NOTE At the time of the first release of this standard, there have been no normative references to statistical

analyses of manufacturing processes and/or statistical methods, applicable for this standard. The bibliography

contains references to technical literature, which can be taken into account.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
model
documented system for the generation of output data using input data

Note 1 to entry: The model shall provide the same data set in output with the same data set as input.

Note 2 to entry: The model calculates physical and/or mechanical property data from input data, the results of

which can also be determined by physical and/or mechanical testing.
3.2
input data

measurement data, or data which is related to those parts of a manufacturing process, which are relevant

to the product properties to be calculated
---------------------- Page: 7 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
3.3
output data

physical and/or mechanical property data of a steel product according to the scope, which is generated

by a model according to 3.1
3.4
manufacturing process

entirety of all process steps (including all time periods between them), that leads from a starting product

(e.g. raw material, or a semi-finished product) to an end product
3.5
model verification

documented system of initial comparative testing and analysis procedures, carried out by the

manufacturer, proving the ability of a model to replace conventional testing of product properties by

output data
3.6
modelling process validation

validation of the process by which the applicability and accuracy of models for prediction of specified

properties is confirmed by an independent, or a notified body

Note 1 to entry: The validation shall be done before it can be used for release of products.

3.7
model monitoring

documented system of regular checks, using data analysis procedures of input and output data, part of

the modelling process, as well as regular comparative testing, to ensure the accuracy and reliability of

modelled product properties
3.8
application range

range of steel products, chemical composition, manufacturing conditions and all additional conditions

affecting the model accuracy for which the model has been verified
4 Requirements on the application of models
4.1 General

Models can be based on direct measurement data (thermo-physical data), indirect measurement data

(e.g. measurement of magnetic or ultrasonic data), statistical data generated from indirect and/or direct

measurement data, or a combination of these methods.

The output data, determined by models, shall be equivalent to the results of conventional testing, within

the limits of allowable gaps, distinctively specified for each physical and mechanical property.

---------------------- Page: 8 ----------------------
oSIST prEN 10373:2020
prEN 10373:2019 (E)
4.2 Application range
4.2.1 General

Models for determination of property data are intended to be used for quality control in the production

process of steel products with specified physical properties, which are documented in standards or other

specifications and which can be alternatively determined by physical testing.

The application range of the model shall be described and documented in reference to the steel products,

in terms of chemical composition and manufacturing conditions and all additional conditions, that have

an influence on the model accuracy, and for which the model has been verified.
4.2.2 Conditions for the application of models
The following restrictions shall apply to models:

a) Manufacturing processes shall run under control of a quality management system and shall produce

input data, representative for the products and in an sufficient amount to apply appropriate

documented statistical methods in the scope of the control and monitoring of models according to

Clause 6 (e.g. large scale production).

NOTE Quality management systems in accordance with EN ISO 9001, or comparable systems, meet this

requirement.

b) The application range of a model shall be explicitly defined and documented with respect to the

considered products.

c) The model outputs shall only be used for product release if the model is used within the application

range.

d) Determination of physical and/or mechanical properties by a model shall be in accordance to the

requirements of a written specification (e.g. national, or international standards, or other

appropriate technical documentation).

e) Only input data, which can be related explicitly to the test unit according to the inspection type,

according to EN 10204 shall be used.

f) The modelling process shall have been validated by an independent or notified body before any

initial application of any model according to Clause 5 of this document.
4.2.3 Conditions for extension of the application range of models

Extension can only be considered if the model itself, including any internal parameter, does not change.

Any extension of the application range which requires modification of the model or its internal

parameters shall be treated as a new model.

In case of the extension of the application range of a model for the determination of physical and

mechanical properties of steels, it shall be ensured, that:

a) The extension of the application range of a model is explicitly defined and documented in terms given

in 4.2.2.

b) The application of the extended model is in accordance with the conditions of 4.2.2.

c) The validation according to Clause 5 of this document has been repeated for the extended application

range of the model,
...

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