EN 4700-006:2025

SLOVENSKI STANDARD
oSIST prEN 4700-006:2024
01-maj-2024
Aeronavtika - Jeklo in zlitine, odporne proti vročini - Gneteni izdelki - Tehnična
specifikacija - 006. del: Vzorci in izkovki za proizvodnjo
Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical
specification - Part 006: Pre-production and production forgings
Luft- und Raumfahrt - Stahl und Hochwarmfesten Legierungen - Umgeformte
Erzeugnisse - Technische Lieferbedingungen - Teil 006: Ausfallmuster und
Serienschmiedestücke
Série aérospatiale - Aciers et alliages résistant à chaud - Produits corroyés -
Spécification technique - Partie 006 : Pièces types et pièces de série
Ta slovenski standard je istoveten z: prEN 4700-006
ICS:
49.025.10 Jekla Steels
77.140.85 Železni in jekleni kovani Iron and steel forgings
izdelki
oSIST prEN 4700-006:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4700-006:2024
oSIST prEN 4700-006:2024
DRAFT
EUROPEAN STANDARD
prEN 4700-006
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2024
ICS 49.025.10 Will supersede EN 4700-006:2010
English Version
Aerospace series - Steel and heat-resisting alloys -
Wrought products - Technical specification - Part 006: Pre-
production and production forgings
Série aérospatiale - Aciers et alliages résistant à chaud - Luft- und Raumfahrt - Stahl und Hochwarmfesten
Produits corroyés - Spécification technique - Partie 006 Legierungen - Umgeformte Erzeugnisse - Technische
: Pièces types et pièces de série Lieferbedingungen - Teil 006: Ausfallmuster und
Serienschmiedestücke
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4700-006:2024 E
worldwide for CEN national Members.

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Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 7
4 Wording of order . 7
5 Health and safety . 7
6 Technical requirements . 8
6.1 General. 8
6.2 Qualification requirements . 8
6.3 Re-qualification requirements. 8
6.4 Release requirements . 9
6.5 Process control testing (procedure X) . 9
6.6 Retests . 10
6.7 Special tests . 10
6.8 Capability clause . 10
6.9 Statistical process control. 11
6.10 Inspection and test report . 11
6.11 Traceability . 11
7 Requirements . 11
Bibliography . 32

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European foreword
This document (prEN 4700-006:2024) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 4700-006:2010.
The main changes with respect to the previous edition are as follows:
— update of Clause 2 “Normative references”;
— Table 2: addition of a note in line 17 and addition of ASTM E340 and ASTM E381 for steels in
line 51.
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Introduction
This document is part of the series of EN metallic material standards for aerospace applications.
The general organization of this series is described in EN 4258.
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1 Scope
This document specifies the requirements for the ordering, manufacture, testing, inspection and
delivery of pre-production and production forgings in steel and heat-resisting alloys.
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 2002-001, Aerospace series — Metallic materials — Test methods — Part 001: Tensile testing at
ambient temperature
EN 2002-002, Aerospace series — Metallic materials — Test methods — Part 002: Tensile testing at
elevated temperature
EN 2002-005, Aerospace series — Test methods for metallic materials — Part 005: Uninterrupted creep
and stress-rupture testing
EN 2002-16, Aerospace series — Metallic materials — Test methods — Part 16: Non-destructive testing
— Penetrant testing
EN 2003-002, Aerospace series — Steels — Test methods — Part 002: Izod impact test
EN 2032-001, Aerospace series — Metallic materials — Part 001: Conventional designation
EN 2032-2, Aerospace series — Metallic materials — Part 2: Coding of metallurgical condition in delivery
condition
EN 2078, Aerospace series — Metallic materials — Manufacturing schedule, inspection schedule,
inspection and test report — Definition, general principles, preparation and approval
EN 2950, Aerospace series — Test method — Wrought heat resisting alloys Semi-finished products and
parts — Conditions for macrographic and micrographic examination — Atlas of structures and defects
EN 2951, Aerospace series — Metallic materials — Micrographic determination of content of non-metallic
inclusions
EN 3874, Aerospace series — Test methods for metallic materials — Constant amplitude force-controlled
low cycle fatigue testing
EN 3987, Aerospace series — Test methods for metallic materials — Constant amplitude force-controlled
high cycle fatigue testing
EN 3988, Aerospace series — Test methods for metallic materials — Constant amplitude strain-
controlled low cycle fatigue testing
EN 4050-1, Aerospace series — Test method for metallic materials — Ultrasonic inspection of bars, plates,
forging stock and forgings — Part 1: General requirements

Published as ASD-STAN Standard at the date of publication of this document by ASD-STAN, https://www.asd-
stan.org/.
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EN 4050-4, Aerospace series — Test method for metallic materials — Ultrasonic inspection of bars, plates,
forging stock and forgings — Part 4: Acceptance criteria
EN 4259, Aerospace series — Metallic materials — Definition of general terms
EN 10027-1, Designation systems for steels — Part 1: Steel names
EN 10079, Definition of steel products
TR 2410, Aerospace series — Metallic materials — Relationship between dimensional standards and
material standards
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-
1:2016)
EN ISO 643, Steels — Micrographic determination of the apparent grain size (ISO 643:2019, Corrected
version 2023-11)
EN ISO 3651-1, Determination of resistance to intergranular corrosion of stainless steels — Part 1:
Austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in nitric acid medium by
measurement of loss in mass (Huey test) (ISO 3651-1:1998)
EN ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels — Part 2:
Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing
sulfuric acid (ISO 3651-2:1998)
EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1:2014)
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1:2023)
EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (ISO 6508-1:2023)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO
6892-1:2019)
EN ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
AMS 2315, Determination of Delta Ferrite Content
AMS 2750, Pyrometry
ASTM E709, Standard Guide for Magnetic Particle Testing
ASTM E1444, Standard Practice for Magnetic Particle Testing

Published as ASD-STAN Technical Report at the date of publication of this document by ASD-STAN,
https://www.asd-stan.org/.
Published by: SAE International (US) https://www.sae.org/.
Published by: ASTM International (US) https://www.astm.org/.
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 4259 apply. For definitions
specific to steel, EN 10079 applies.
ISO and IEC maintain terminology 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/
4 Wording of order
The order shall clearly indicate:
— quantities to be supplied;
— dates of delivery;
— material standard number;
— delivery condition and metallurgical code of products;
— dimensions and tolerances or reference to an appropriate dimensional standard;
— product designation, when required;
— forwarding address;
— nature and type of packing, if required;
— surface protection, if appropriate;
— definition and frequency of any special tests and their retest procedures, if required.
5 Health and safety
The products in the delivery condition shall fulfil the current health and safety laws of the area of the
country where it is to be delivered.
A product safety data sheet shall be available.

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6 Technical requirements
6.1 General
The product shall satisfy the requirements of the order, drawing inspection schedule or material
standard: see Table 2, line 5.
The order, drawing or inspection schedule shall specify the tests to be performed upon (i) pre-forgings
for qualification and/or requalification (ii) serial production forgings for process control testing
(Procedure X: see 6.4) and (iii) batch release when cut-up testing or forgings is required. Unless
otherwise specified on the order, drawing or inspection schedule, acceptance criteria for the tests are
stated in the material standard, the requirements for each line of which are detailed in Table 2 and
Table 3 of this technical specification. Table 2 related to lines 1 to 29 (inclusive) of the material
standard and Table 3 relates to lines 30 onwards in which the subline format is also used. If a particular
test is needed but not shown in a specific line in Table 2 and Table 3, the requirement shall be specified
on the order, drawing, inspection schedule or material standard.
6.2 Qualification requirements
See line 100 in Table 3 of this document.
Qualification shall normally comprise assessment of pre-production forgings. See Table 2, sub-line 4.2.
6.3 Re-qualification requirements
Re-qualification of serial production forgings may be required, in the following cases:
— modification of the drawing;
— use of forging stock from a different source;
— modifications to the forging stock form and/or manufacturer route;
— modifications to an existing die;
— use of a new (replacement) die;
— modifications to the forging manufacturing route;
— when a significant time interval (usually several years) had elapsed between forging campaigns for
a specific part number;
— when required by the purchaser for any other reason.
Re-qualification testing requirements, especially location of test pieces, shall be identical to those used
for the initial qualification of the pre-production forgings unless otherwise specified on the order,
drawing or inspection schedule.

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6.4 Release requirements
Release testing shall be the responsibility of the manufacturer. The sampling procedure for release
testing shall be one of the following, as specified on the order, drawing or inspection schedule. Where
no procedure is specified, procedure A shall be used:
— procedure A: separate forged test samples shall be procedure produced from the same batch of
forging stock as that used to make the serial production forgings. Procedure A may be used alone
unless denoted AX on the drawing, order or inspection schedule in which case it shall be applied
only in conjunction with procedure X (see subclause 6.5);
— procedure B: separate forged heat treatment control test samples shall be prepared which conform
to the same material standard as the production forgings, but from a different batch of forging
stock. Procedure B shall only be used when full heat treatment of the serial production forgings is
carried out by the manufacturer and only in conjunction with procedure X (see subclause 6.5);
— procedure C: integral test samples shall be removed from each forgings. The order, drawing of
inspection schedule shall specify how many test samples shall be tested per batch. Procedure C may
be used alone unless denoted CX on the drawing, order or inspection schedule in which case it shall
be applied only in conjunction with procedure X (see subclause 6.5);
— procedure D: test samples shall be machined from forging(s) selected from each production batch
and at locations specified on the order, drawing or inspection schedule.
When required, the manufactured shall inform the purchaser of the planned dates for extraction of
samples and release testing in order that these operations may be witnessed.
6.5 Process control testing (procedure X)
Procedure X is process control procedure consisting of periodic “cut-up” testing to ensure that the serial
production forgings continued to conform to the specified requirements.
If procedure X is invoked by the order, drawing or inspection/manufacturing schedule and/or if
procedures B, AX or CX are used for release tests (see subclause 6.4), forgings shall be selected from
series production at the frequency stated therein. It is recommended that the maximum number of
forgings manufactured between repeat “cut-up” testing conforming to procedure X shall be as stated in
the following Table 1:
Table 1 — Number of forgings
Mass of forging Number of forgings
kg
≤ 1 ≤ 2 000
1 < mass ≤ 2 ≤ 1 000
2 < mass ≤ 5 ≤ 400
5 < mass ≤ 25 ≤ 200
> 25 As stated on the order, drawing, inspection schedule
The testing requirements, including the location, type and size of test pieces shall be identical to those
used for qualification of the pre-production.
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6.6 Retests
Retests shall be required if the specified acceptance criteria are not fully met during qualification
testing on pre-production forgings, process control testing (procedure X) or batch release testing.
If the test product or test piece preparation is faulty, testing shall be re-applied at the original frequency
after rectification of the original cause of failure. At least one of the retests shall be from forgings from
which the unsatisfactory result was obtained (unless already rejected by the manufacturer after
suitable identification of the cause of failure). If insufficient material remains, the purchaser shall advise
as to how to proceed.
If all retest results fulfil the specified acceptance criteria, the pre-production forging
qualification/process control test (procedure X) shall be deemed satisfactory or the batch shall be
accepted, as appropriate.
If one or more retest results fail to fulfil the specified acceptance criteria, the following actions shall be
taken:
a) for qualification testing of pre-production forgings, advice shall be sought from the purchaser as to
whether the retest results are acceptable for that part of the forging. If so, this shall be denoted by a
note on the drawing, together with values which are acceptable for that location. Alternatively, if it
is essential that the specified acceptance criteria are achieved at all locations, the purchaser may
request modifications to be made to the manufacturer route;
b) for process control testing (procedure X), the tests shall be repeated on a second forging taken as
close as possible to the above in the production sequence and/or and extensive review shall be
made of the manufacturing records of forgings made since the previous control tests. Serial
production of the forging in question (and others if appropriate/deemed necessary) shall not
continue until the cause of the unsatisfactory values has been ascertained and rectified);
c) for batch release testing, the batch shall be either:
o rejected, or
o partially of fully re-heat treated if it is believed that re-heat treatment can rectify the cause of
the failure and then test as a completely new batch from which the conforming products shall
be accepted. The re-heat treatment shall be stated on the test and inspection report.
No products or test sample shall be re-heat treated more than once.
6.7 Special tests
Special tests and/or inspections may be required by the purchaser. In such cases, the nature of the test,
method, frequency and technical requirements shall be specified on the order, drawing or inspection
schedule and shall be mutually agreed by the manufacturer and purchaser.
6.8 Capability clause
The capability clause normally applies only to forgings of suitable size and configuration during process
control testing (procedure X) and/or batch release testing when invoking procedure D. The number of
batches after which sufficient statistical evidence is deemed to justify cessation of testing for a
particular property (or reduced frequency of testing) shall be mutually agreed between the
manufacturer and purchaser. However, this is no way reduces, the obligations of the manufacturer to
fulfil the requirements. If subsequent testing indicates that the product does not comply with the
requirements, the batch shall be rejected.
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6.9 Statistical process control
Reduction in the extent of release testing, other than that specified in subclause 6.7 above may be
negotiated with the purchaser on the basis of appropriate statistical process control and/or statistical
data.
6.10 Inspection and test report
The manufacturer shall furnish, with each delivery, a report conforming to the requirements of EN 2078
stating the following:
— manufacturer's name and address;
— order number;
— drawing and/or part number;
— material standard number;
— delivery condition and metallurgical code of the product;
— quantity of forgings;
— cast and batch number;
— batch and/or test samples heat treatment, if appropriate;
— results of all tests, retests and chemical analyses.
6.11 Traceability
Each product shall be traceable to the cast, production batch and/or heat treatment batch at all stages
of manufacture, testing and delivery.
7 Requirements
Requirements are given in Table 2 and Table 3.
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Table 2 — Technical requirements for lines 1 to 29, where appropriate (1 of 12)
Frequency of testing
Material standard line
reference
Requirements
Qualification Release
No. Title
1 Material designation EN 2032-001 and EN 10027-1 if applicable — —
2 Chemical The chemical composition of the alloy shall comply with requirements of the material standard. a) 1 per cast in a) 1 per cast in
composition The test samples used for chemical analysis shall be representative of the melt. the case of air the case of air
The method of analysis shall be at the option of the manufacturer, but in cases of dispute, the melted or melted or
reference method set out in the relevant EN or ISO standard shall be used. If no EN or ISO standard vacuum vacuum
exists, a fundamental and agreed method of chemical analysis calibrated against accepted reference induction induction
standards shall be used. melted melted
In the case of remelted material, samples shall be normally taken from the top of each ingot or ingot product product
product, as follows: b) 1 per VAR or b) 1 per VAR or
a) vacuum arc remelted (VAR) ingots: the bottom of each ingot or ingot product; 2 ESR ingot ESR ingot
b) electroflux or electroslag remelted (ESR) ingots: the top and bottom ends of each ingot or ingot representing
product. top and
An analysis shall be made of each sample and certificates of analysis shall be supplied to the bottom
purchaser. The elements to be determined shall be as required by the material specification or as positions
agreed between the manufacturer and the purchaser.
Elements not quoted in the material standard shall not be intentionally added to the alloy without
the agreement of the purchaser, except for the purpose of finishing the heat (e.g. addition of
deoxidant); reasonable precautions shall be taken to prevent their inclusion during manufacture.
The purchaser, in agreement with the manufacturer, may set a limit to the amount of one or more
such elements and may require the amount of such elements to be stated in the certificate of
analysis.
The specified ranges of chemical composition are based on cast analyses. Any subsequent analytical
checks shall take into consideration the heterogeneity normal to the alloy.
Additionally for remelted products, the samples shall be representative for the remelted ingot,
taking into account any macro segregation.
The test samples used for chemical analysis shall be representative of the product and shall be taken
from location corresponding to top and bottom of each ingot produced after the final melting stage.
The method of chemical analysis shall be at the discretion of the manufacturer unless otherwise
stated in the material standard or order. In cases of dispute, the method of chemical analysis shall be
agreed between the manufacturer and purchaser preferably using existing chemical analysis
standards. The measured chemical composition shall be stated on the certificate of conformance.

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Table 2 — Technical requirements for lines 1 to 29, where appropriate (2 of 12)
Frequency of testing
Material standard line
reference
Requirements
Qualification Release
No. Title
3 Method of melting 1 General — —
The alloy shall be made by the process required by the material standard, unless otherwise agreed
between the manufacturer and purchaser. If the material standard permits alternative processes, the
manufacturer shall decide which of them shall be used unless the purchaser states a particular
preference on his order. In all instances, the process by which the alloy was made shall be indicated
on the release note.
2 Consumable electrode remelted material
2.1 Except as provided in 2.3 or 2.4 at no time during remelting shall material of any other
composition or type be introduced into the melting chamber, i.e. starter material and electrode stub-
ends shall be of the same composition as the material being remelted.
2.2 Whenever possible and except as provided in 2.3, weld material used to join electrodes
together and to join the electrode to the stub-end shall be of the same composition as the material
being remelted. If such weld material is not obtainable, material of a similar composition to, or
compatible with, the material being remelted may be used at the discretion of the manufacturer,
unless the purchaser indicates that his prior agreement is required.
2.3 Alternatively to 2.1 and 2.2, for electro-flux and vacuum arc remelting, the stub and any weld
material may be different from that being remelted, provided that the remelted material is not
contaminated with material from the stub-ends or weld and that, for vacuum arc remelting, the stub
welding takes place outside the furnace. Remelting shall be terminated not less than 20 mm from the
electrode/stub interface and, after completion of the remelting cycle, the electrode/stub interface
shall be examined to verify that the stub and weld are intact.
2.4 For electroflux melting, material compatible with the composition of that being remelted shall
be permitted to provide electrical contact to the furnace base plate, provided that the chemical
composition of the melt is maintained.
4.1 Form Pre-production and production forgings — —

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Table 2 — Technical requirements for lines 1 to 29, where appropriate (3 of 12)
Frequency of testing
Material standard line
reference
Requirements
Qualification Release
No. Title
4.2 Method of Pre-production forgings: — —

production
Prior to commencing series production of a particular design, pre-production forgings shall be
produced in order to qualify the method of manufacture and equipment configuration and to
demonstrate that the requirements of the purchaser can be met.
The following requirements shall be specified on the order, drawing and/or inspection schedule:
— number of pre-production forgings to
...