BS-10139 1998

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BRITISH STANDARD

Cold rolled uncoated mild

steel narrow strip for cold

forming

-

echnical delivery

conditions

The European StandardEN 101391997has the status of a

British

Standard

ICs 77.140.50

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT

LAW

B S EN

10139:1998

opyright European Committee for Standardizationrovided by IHS under license with CEN

Not for Resaleo reproduction or networking permitted without license from IHS

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STD-BSI B S EN LOL39-ENGL 1998

L b 2 L l b b 9

0 7 0 8 7 b 2 2 L b

BS EN 10139:1998

This

British standard,having

been

prepared under the

direction

of

the EngUieering

Sector

Board,was

published

under the

authority

of the

Standards Board

and comes into

effect

on

16

July 1998

BSI

1998

ISBN O 5802 MM X

National foreword

This British Standard

is

the English language version

of

EN 101391997. It

supemedesBS 1449 :Section 1.9 :1991 which is withdrawn.

The

UK

participation

in

its

preparation

was

entnisted

to

Technical

Committee

ISW10,Flat rolled steel products, whichhas he responsibilityto:

- id enquirers o understand the t

- resent

to

he responsible European commitîeeany enquirieson the

onitor

related

international

and

European developments and promulgate

interpretation,or proposals for change, and keep the

UK

interests

informed,

them in the UK.

A list of organizations represented on thi s committee

can be

obtainedon request to

its secretary.

Cross-references

The BritishStandardswhich implement international or European publications

referred

to

in thisdocument may be found

in

the BSI Standards Catalogue under the

section entitled

“ht~rnational

tandards Correspondence Index”, or by using the

“Find”faciiity of the BSI StandardsElectronic Cataìogue.

A BritishStandard doesnot purport

to

include a l l the necessary provisions of a

contract. Usersof British standards are responsible for their correct application.

Compliance with

a

British Standard does not

of itself

confer immunity

from legal obligations.

Summary of pages

This document comprises a front cover, an inside &ont cover, the EN titìe page,

pages 2 to 12, an inside back cover and a back cover.

Amendments issued since publication

AmdNo* Date ITe*affebed

opyright European Committee for Standardization

rovided by IHS under license with CEN


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STD.BS1

B S

EN

L O L 3 9 - E N G L 1 7 7 8

m

Lb2Libbî 07087b3

152

m

EUROPEAN

STANDARD

NOFUVE EUROPÉENNE

EUROP- NORIM

EN 10139

November 1997

ICs 77.140.50

Descriptors: Cold rolled products, strips, low carbon steels, unalloyed steels, cold-working, classifications, grades: quality,

delivery conditions, designation, characteristics, tests

Engùsh version

Cold rolled uncoated

mild

steel

narrow sttip for cold

forming

chnical

delivery conditions

Feuillards non

revêtus

l amnés

à

h i d en aciers

doux pour formage

à h i d onditions

techniques de livraison

Kaltband ohne

Übemig aus

weichen

stahlen zum

Ka\tumformen hnis ch e Liefe&xhgungen

This European Standard was approved by CEN on 24 November 1996.

CEN members are bound to comply with the CENKENELEC Internal Regulations

which stipulate the conditions for giving

thi s

European Standard the status of a

national

standard

without any alteration. Up-to-date

iists

and bibliographical

references concerning such national

standards

may be obtained on application

to

the Central Secretanat 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 Centsal Secretariat has the

same status

as

the official versions.

CEN members are the

national

standards bodies of Austria, Belgium, Czech

Republic, Denmark, F’inhd, Frcuice, Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and

United

Kingdom.

CEN

European Committee for Standardization

Comité

Européen de Normalisation

Europäisches Komitee für Normung

Central Secretariat:

rue

de Stassart 36, B-1060 Brussels

O

1997CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national

Members.

Ref. No. EN 101391997 E




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STDmBSI BS EN 1 0 1 3 9 - E N G L

1998 m 1 b 2 4 b b 9 0 7 0 8 7 b 4 O99

Page 2

EN 10139A997

Foreword

The European Standard has been prepared by

T e c h n i d

Committee ECISS/TC 13, Flat products for

cold w o r m - ualities, dimensions, tolerances and

specific

tests

the

secretariat

of which is held by

IBNAIN.

This European Standard shall

be

given the

status

of

a

nationai

standard, either by publication of an identical

text

or by endorsement, at the latest by May 1998, and

the latest by May 1998.

According

to

the CENICENELEC

Zntenial Regulations,

the

national

standards

organktions

of the following

countries are bound to implement thisEuropean

Standard:Austria,

Belgium, Czech Republic, Denmark,

Finland, France, Germany Greece, Iceland,

Ireland,

Italy,

Luxembourg, Netherlands, Norway,

Portugal,

Spain?Sweden, Switzerland and the

UNted

Kingdom

conflicting

national standards shall be

withdrawn

at

Contents

Foreword

1

2

3

4

5

6

6.1

6.2

6.3

6.4

6.5

6.6

6.7

6.8

7

7.1

7.2

7.3

7.4

7.5

8

9

10

11

12

scope

Normative references

Definition

Classification of grades and delivery

condition

Designation

Properties

Production

processes and chemical

composition

Choice of properties

Mechanical and technological

properîies

Surface chamcteristics

Stretcher

stsallis

Suitability for the application of

surface coatings

Weldability

Dimensions, mas, permisible

tolerances

Testw

Agreement of acceptance testing

Acceptance

units

and number

of tests

Sampling and preparation of

test

pieces

Test

methods

to be

foilowed

Re-tests

Marking

ouing

Packing

Information

to be

supplied by the

purchaser

Disputes

Annex

A

(normative) Methd of

determination

of

the piastic strain ratio T

Annex

B

(nomative) Methd of

determination of strain hardening

exponent

n

Annex

C

(informative) List of

national

standaràs complying with the eurononns

given

in

the references

(see

clause 2

page

2

3

3

3

3

4

4

4

4

4

4

4

5

5

5

5

5

5

5

5

5

5

6

6

6

6

10

11

12

Q

BSI 1998




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S T D B S I B S

E N

LOL37-ENGL 1778 L b 2 4 b b 7 0 7 0 8 7 b 5 T 2 5

1 scope

1 1

This

European Standard applies

to

cold rolled

narrow strip

in

coils and cut lengths in thichecses up

to 1Omm and of widths less

than600

nun,

made from

mild, unalloyed and alloyed steels in accordance with

Table 1.

These products are suitable for cold forming. They are

also

suitable for surface coating. On he other hand,

they are not suitable for hardening beatment followed

by tempering.

1.2 This

European Standard does not cover cold

rolled flat products for which a separate standard

already exists, particularly the following products:

old rolled non oriented magnetic steel sheet

and strip (EN 10106);

rajn-onented magnetic steel sheet and strip

(EN 10107);

emi-processed steel strip for the construction

of magnetic circuits

(EN

10126

and

EN 10165);

old rolled narrow ship for the manufacture

of springs (EURONORM 132);

igh yield strength steels for cold forming

(EN

10268);

old rolled uncoated low carbon steel fiat

products for cold fonning (EN 10130);

old reduced blackplate

(EN

10205);

heet and strip for enamelling (EN 10209).

2 Normative references

This

European Standard incorporates by dated or

undated reference, provisions from other publications.

These normative references are cited

at

the

appropriate place in the text and the publications axe

listed hereafter. For dated references, subsequent

amendments to or revisions of any of these

publications apply to thi s European Standard only

when incorporated in it by amendment or revision. For

undated references the latest

edition of the publication

referred

to

applies.

EN 10002-1,

Metauic materials

nsile

test

Part 1:Meüwd of test (at ambient temperature).

EN 10002-2,

Metauic materials

ensile

test

Part 2: V fìcatwn

of

the f ì e masuring

system

of

the tensile

testing machines.

EN 1000241),Metauic ma- nsile

test

Part 4: Vemfication

of

extensometer

used in

uni xi l

EN 10020,Definition and classification of

grades of

Steel.

testing.

Page 3

EN 101391997

EN 10021,SteeLs and i ron und

steeì

products

eneml

technical

cìeìivery

conditions.

EN 10027-1,

Designation

systems

for

steel

Part 1:Steel namas, pr inc ipa l sgrnòols.

EN 10027-2,

Designation

systemsfor steel

Part

2:

Numerical

sysiern.

EN 10079,Def in i twn of steel products.

EN 10140,Cold mUed narrow strip l'oblemnces on

dimensions and

shape.

EN 10204,Metuüic

products

m s of inspection

clocuments.

EURONORM 5 (1979)2), V i c k s hardness

test

for steel.

EURONORM

18

(1979)2),

Sampling and preparation of

test

pìeces

for

steel and

iron

and

steel

products.

EURONORM 49 (1972)2),

Memurernent of

the

roughness of thin products

made of cold

rolled

and

uncoated

stm. ~.

CR 10260,Designation systemsfor steel

-Additional

symbols for

steei

n u m .

3

Dennitions

3.1

For the purposes of

ths

European standard, the

definitons

of

cold rolled flat products given

in

clause 1

are identical

to

those given in EN 10079.

NOTE

in

the case of narrow widths,

strip

complying

wth

t h i s

standard may

also

be

wound

in

layers and supplied

in

the form

of

a

bobbin wound coil.

3.2

After uncoiling

and

shearing, strip may be

supplied

in

cut lengths.

4 Classification of grades and delivery

condition

4.1 This European Standard specifies the grades listed

in 'pable 1. in the

case

of steel graàe

DCO1,

the

deoxidation method

shall be

le&

to

the manufacturer's

discretion.

Steel grades

DC03,

DC04, DC05 and DC06

shall

be

supplied

fully

kiiled.

4.2 Products manufactured from these steelsmay be

ordered and supplied

in

different delivery conditions

(see W l e 1) and

with

different surface appearances

(see

6.4

and làble 2).

4.3

For the purposes of the

specifications

of thi s

European

Standard,

the selection of steel graàe,

delivery condition and surface finish are the

responsibility of the purchaser.

'1

Currently at

draft

stage.

2,

Until

they

are transformed into European Standards, either the Euronorms or the corresponding national standards listed in annex C

of

this

European

Standard may be used.

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10139-ENGL 1998 m L b 2 1 ( b b 9 0 7 0 8 7 b b 9bL

Page 4

EN

10139A997

6

Designation

The symbol designation of the steelgrades n thi s

European

Standard

is

in

conformi ty

with

EN 10027-1 and Information Circular ECISS IC 10; the

numerical designationis allocated in conformity with

The standarddesignationconsists of the words narrow

strip or cut lengths, followed in order by:

a)

reference to this European Standard,EN 10139,

b) the symbol DC, followed by the grade designation

(01,03,04,05 and 06);

c) the symbol for delivery condition (see làble 1 ;

d) the symbol for surface appearance@& MB or

MC eeW l e

2);

e) the symbol for surface finish where appropriate

(RM

or

RR,

see

6.4.3

and làble

2).

EN 10027-2.

Examples of standard designations

Designation of cold rolled steel narrow strip, grade

DCO4,

in

a lightly skin-passed condition

(LC),

with a

“scratch and pit-free” surface appearance

(MB)

and a

”matt” surface finish

(RM):

D e s i i o n of cold rolled

steel

narrow strip, grade

DC03, n the anneaiedcondition(A), with “bright”(MA)

surface appearance and a “smooth” surface finish:

Narrow strip

EN

10134DC04

+

LC

MB

RM

Narrow strip EN 10139-DCû3+

AMA

6

Properties

6.1 Production processes an d chemical

composition

6.1.1 The steel making process of the steelshall be

lefi

to

the manufacturer’s

discreüon.

The production process of the product, where not

stipulated in the order,shall also remain at the

manufkturer’s discretion.

6.1.2 The chemical compositionbased on ladle

analysisshail

be as

given

in

W l e

1.

6.2 Choice of properties

The products covered by this European standard shaii

comply with the specifications given in W l e

1

of this

standard.

If

agreed

separately, they may

be

supplied

with a special

sui tab i i

for makjng a particular pait;

in

this

case maximum percenhge of processing

scrap may be ñxed by common agreement and

acceptance

tests

on the basis of the mechanid

properties shallnot apply

6.3 Mechanical and technological properties

6.3.1 The mechanid and technologid properties of

the products

~IE

given

in

làble

1.

These properties

are

guaranteedfor the periods speci6ed

in

làble

1

with

effect€¡-om the date

that

the products are made

available forde hqx The purchasershail be

nformed

of

this

date when the produds o be made available,

with

a

warning

appropriate

to

the

guarantee

of

mechanid properties. &rage of graàe

N O

produds

for more than3months

may cause a

change in the

mechanid properties

iikely to give rise to a

reduction

in the suitability for forming and ctrawing

6.3.2 The usual test

for

checking the mechanical

properties given

in

W l e 1

s

the tensile test,However,

if

agreed

at

the time of ordering,

hardness

values

may

be specified

i nstead

of tensile testproperties, but not

both.

6.3.3 The tensile test values

shaìl

apply to longitudinal

test

pieces. The requirements of3.3.2 of

EURONORM 18-79,shall not apply

6.4

Surface

characteristics

6.4.1 General

Surface c-ristics concern surface appearance

and surface finish. These shall

be

specified by the

purchaser

at

the time of ordering.

Unless otherwise speciñed

at

the time of orùering, he

products

shail

be supplied with

a

surface appearance

MA

and

a smooîh

surface

finish (Rb

with R,

5

0,6pm).

6.4.2 Sur tzce appearance

6.4.2.1

Cold rolled fiat products covered by thi s

European Stanàard may be supplied with surface

appearances

MA,

MB or MC as described in làble 2.

The required surface appearanceshall be stated in the

designation see clause

6).

6.4.2.2 The characteristics

ndicaîed in

làble 2 apply

to

the surfaceactually inspected, which is generally the

outside surface of coils and the top surface of lengths.

The appearance of the uni nspected d a c e shall

correspond

at

least

to

surface appearance

MA.

These

charact~ristics

hall not apply to the

first

inner

and outer laps of coil or

to

lengths cut from them.

6.4.3

Suflncejìnish

6.4.3.1 The surface

finish

may be

rough,

math, smooth

or

mirror finish,as given in làble 2.

Products with surface

appearances

MA and

MB

are

generaiiy supplied with

a

smooth surfacefinsh (RI.,). If

rough

(RI¿)

or

matt

(RM)

ñnishes

are requkd, the

corresponding symbolshaü

be

given in the designation

see

clause6 .

The surface appearanceMC hali only be supplied with

a

”mirror”

finish

(RN).

6.4.3.2 The different surface

finishes

are

characterized

by the following referencevalues of mean roughness

rough:I , 1,5pm;

malk 0,6 pm

c R,

1,8

pm;

smooth

R,

5 0,6 pm;

mirror fini& R, 5 0 2

pm.

6.6

Stretcher strains

The tendency towards the fonnation of l.?a&ms or

stretcherstrains during forming may

be

eliminated for

a

time by light

skin-pasing

(LC).

The period of M o m rom stretcher

strains

can

be

assumed

to be three

months for gradeWO1 and six

months for the other

grades,

from the

agreed

date

when the product

is

available for dehvery

(o BSI

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6.6

Suitability for the application of surface

coatings

6.6.1

The products covered by ths European

Standard are suitable for surface coatings t a h g into

account the following requirements:

a) li

the products

shall

be suitable for organic

coating;

b) li the products shall be suitable for the

application

of

a metailic coating, e.g. zinc, tin or lead

by means of hot dipping or thermal spraying;

c) all the products with surface appearances

Mi3

or

MC shall be suitable for electrolytic coating.

6.6.2

The application of surface c o m equires that

the surface

be

suitably prepared beforehand

by

the

processor. The type of coating

shail

be

agreed

at

the

time of ordering

if

the types of coatings described

in

6.6.1

b) and c)

are to

be used.

6.6.3

If

a metallic coating is to be applied in

accordance with

6.6.1

b), it shallbe noted that for

delivery conditions C290to C690, recovery or

recrystallization caused by higher temperatures could

have an effect on the mechanical properties of the

product.

6.7

Weldability

All steel

grades

and delivery conditions shall be

suitable for welding using appropriate methods. For

delivery conditions C290

to

C690, it should be noted

that

the temperature rises during the welding operation

could affect the mechanical properties and the

microstructure.

6.8 Dimensions, mass, permissible tolerances

6.8.1

For the dimensions and the tolerances on

dimensions and shape,

see

EN

10140.

6.8.2

A density of 7 , s kg/dm3 shall be assumed for

calculating the masses for ll types of steel covered by

ths European Standard.

7 %?st ing

7.1

Agreement

of

acceptance testing

7.1.1 If a

test

is

specified by

a

purchaser, he shall

specify

at

the time of tendering and ordering:

- he type of test (specific or non-specific)

(see EN 10021);

he type of test document (see EN 10204).

7.1.2

The specific test shall be carried out in

conformity with the requirements of

7.2 to 7.6.

7.2 Acceptance units and number

of

tests

7.2.1

The acceptance unit is

5 t

or

fraction

of 5

t of

products of the same steel grade, the same delivery

condition and with the

same

surface characteristics

and nominal thickness. Coils weighing more than

5

t

shall be regarded as one acceptance unit.

All products belonging to one acceptance unit shall be

from the same cast.

Page 6

EN 101391997

7.2.2

For each acceptance unit

a

tensile

test

shall be

carried out

and

where appropriate a determination

of n

and

r

(see Table

1

and annexes

A

and

B).

Alternatively

if specified at the time of ordering a hardness test shall

be carried out.

7.3

Sampling and preparation of test pieces

7.3.1

A sample of adequate size for

all

the

tests to

be

carried out shall be taken from the products

comprising the acceptance unit from any position on

the strip or cut length. In cases of dispute,

ths

sample

shaiì be taken from

a

position at least 3 m from one of

the ends of the coil.

7.3.2

The tensile

test

pieces

shall

be taken from

samples complying with

7.3.1,

parallel to the direction

in

which the product was rolled. The

test

pieces

should not

be

further worked on either surface.

7.3.3

When cutting the teJt pieces from the samples,

as

little deformation as possible shall be caused. If

shears or cutting torches are used, an adequate surplus

shaiì be allowed, which will then be further worked

(see EURONORM

18).

7.4

Test methods to be followed

7.4.1

All mechanical and technological tests shall be

carried out

at

ambient temperature.

7.4.2

The tensile test shall be carried out in

accordance with EN

10002-1.

7.4.3

if agreed separately at the time of ordering, the

Vickers hardness test shall

be

carried out in

accordance with EUFtONORM 5.

7.4.4

If

agreed

separately at the time of ordering,

surface roughness

shall

be determined in accordance

with EURONORM 49.

7.4.6

The determination of plastic

strain

ratio r and

tensile hardening component

n

shaH be carried out in

accordance

with

annexes

A

and B of tkis

standard.

7.6

Re-tests

7.6.1

if

the

resuits

obtained from

a

correctly selected

sample do not meet the specined requirements, two

further samples from the same acceptance unit

shall

be

tested for each unsatisfactory test

in

accordance with

EN 10021and both these shall meet the specified

requirements.

7.6.2 The manufacturer

shall

be entitled to submit

unsatisfactory acceptance units for retesting after

suitable rectification treatment has been carried out.

8 Marking

Marking of the products in h e with the specifications

of EN 10021 may be agreed at the time of ordering.

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Page 6

EN

1013 k1997

9Oil ing

9.1 For all delivery conditions, apart from

A,

the

products are

usuaily

covered with traces of rolling

oil

during the íjnishingprocess. However,

this

does not

provide aàequate protection against corrosion.

9.2 The products

are

normally suppliedoiled.

in

this

case oth sides are protected bya coat of nondrying

neutrai

oil,

free from foreign bodies and spread

uniformly

so that

under the n o d

acking, kmsport,

loading and storage conditions therewill be no

corrosion after

three

months.

If the

transport

and storage conditions make special

corrosion protection necessary, the user shall

inform

the manufacturer of

thi s at

the time of ordering.

The

oil

film

shall

be removable by

an

alkaline solution

or other n o d olvents.

The selectionof protection oils

shall

be the subject of

a

separate agreement.

9.3 If the product is

to

be supplied with the surface

degreased

at a

separate operation,ths

shail

also be

agreed

at the time of ordering.

9.4 if the product is to be supplied in the asrolled

condition, or without oil, here is an increasedrisk of

scratching

and rust formation during transpornon

and storage.

10

Packing

The

type of

packing conditionsshail be agreed

separatelyat the time of ordering.

11 Idormation

to

be

supplied by the

purchaser

To

compiy

adequately

with the requirements of

ths

standard, tenders and orders shali include the

following information:

a)

the complete designation of the product

(see clause 6);

b) if nec- the delivery condition required,

noting the suitabilityof the product for

making a

particuiarpart (see 6.2);

c) the suitability

for

the applicationof surface

coatings (see 6.6);

d) whether the product

is to

be supplied with an

oiled

or an unoiled surface (see 9.2 and 9.3);

e) nominal dimensions (see

6.8 ;

f)

quantity tobe supplied;

g) the type of acceptancetests required (see7.1.1);

h)

if

necessaq the

type

of test document wanted

(see 7.1.1);

i)

marlung

requirements

see

lause 8);

j packing requirements, including

limits

on mass

and dimensions of

coils

and individual bundles

(see clause10).

12

Disputes

The provisions of

EN

10021

shaii

apply

to

disputes and

their settlement.

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LO337-ENGL 1778 W

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Symbol

MA

MB

MC

Page

9

EN 101391997

Characteristics

Field of

application Surface finish

(see 6.4.3)

RR,

RM, RL2j

RM, RL2)

Bright, metaiìicaiiy clean surface, pitting, small

AU

thicknesw and

defects

and scratches

are

permitted.

treatment conditions

Bnght, metallically clean surface; pi- grooves and Thicknesses 5

2,0

mml)

scratchesare permitted as long as the uniform ali irealment conditions

smooth appearance is not substantially impaired except

A

when viewed wiîh the naked eye.

Bnght, me tailidy clean surface; pitting grooves and Thicknesses ,0

mml)

scratches are permitted as long as he

uniform

all

treatment conditions

appearance

of

the mirror surface

is not impaked.

except

A

RN2)

Table

2

urface appearances and

finishes

O

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EN 10139A997

Symbol

Designation

b

ûricjnai

gauge

width

of the test piece

Annex A (normative)

Method of determination of he plastic

s t r a i n ratio

r

NOTE This annex

is

based upon the proceduresbeing developed

by ISOmC 1WSC2.

A.l Deñnitions, symbols and designations

A.l. l plastic strain ratio r is definedas the ratio of

true width and thicknessstrains

in

a

test

piece that

has

been submitted

to

miaxial tensile stsess.

&b

r = -

Ea

where

E

q, isthetruewidthshah.

is

the true thickness

sti.ain;

The plastic shah shallbe homogeneous.

A.1.2 S i c e measurements

of

length are more easily

made thanof thickness changes the foilowing

relationship derived from the

law

of constancy of

volume before and after plasticstrain is normally used

for calculation of

Unit

mm

r = -

ln-

Lb

Lobo

The symbol

r shall

be

completed by index figure

x

giving

the orientation of the testpiece relative

to

the

roiìing direction and by index

figure

y giving the strain

levei, for example,

rwo (see

'pabe Al).

A1.3 The weighted averagerdgd u e s cal-

using

the fo rm a

- ro + ra + 2r45

4

=

A1.4 symbols and designationsused

in

measurement

and calculations for detennining the piasticsimin

ratioT are given in "?able Al.

A.2

Principle

The method invoivescafiying out

a

tensile test

to a

speciñed strain level of 20 and of determinllig the

plastic strain ratio by calculation

from

measurements

of the changes in length and width for a given test

piece

As

the determination

shall

be d e d ut in the range

of homogeneous deformaton, then

if

the

uniform

elongationof the tested material

is

lower than20 ,

strain vaiues of 15%

to 20 can

be appìid The

strain

level

shaìl

be

given as

index

y

The orientation of the

testpiece r e w e o the roiling direction shaìl be given

as indexs seeA.1.2 .

Lo originalgaugelength

L Gauge length &r stmhing to

a

specified elongation

mm

mm

Gauge

width of thetest piece after

strainin9 to

a mecifed elongation

mm

r

rzIv

Plastic strain

ratio

Plastic strain ratio

in

directionx

in

degrees) relative

to

the rolling

direction for the strain level?I

7

)

E

Q

Weighted average of rdgd u e s

?hiethicknessbrain

?hiewidthstrain

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O T L

Designation

I

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EN 101391997

A.6.6 Mount the test piece in the grips of the testing

w h i n e and apply the load in accordance withA.6.4:

a)

to

achieve the prescribed

stralli

(manuai

determination);

b) to determine the

width

d u e s

at

the prescribed

strain

level (automaljc determinaíion).

A.6.6 For

manual determination after removing the

load measure the gauge length and gauge width b in

the same manner and to the same tolerance as for

original values.

A.6.7 For automatic determination the measurements

of

length and width

at

the prescribed

stralli

level are

made according to

A 4 2

A.6.8 For

m u a ì

detemünaîion calculate the plastic

strajn

ratio

in

accordance with

A.1.2.

A.6.9 For automatic determination the plastic strain

ratio is obtained directiy using an automatic tensile

testing machine and data processing program. The

elastic slmins

(in

both width and length directions)

shall

be considered.

A.6.10 Calculate the weighted average (see A.1.3 .

A.6 Interpretation

of

results

A.6.1 Determined values of plastic strain

ratio T shall

be rounded

to0,05.

A.6.2

If

the

test

piece shows

any

mnsveme bow,

which could influence the test results, the

test

shall be

considered invalid and

a

new

test

shall be carried out.

A.6.3 If the plasüc

slmh

was inhomogeneous, the

test results shall be considered invalid

and a

new t st

s h d be carried out.

A.6.4

In

case of dispute the testing shall be carried

out

with

three test pieces of specified orientation

relative to the rolling

direction.

The average value of

the

three

tests

shall

be considered.

A.7 Test report

The orientation of the applied strain relative to the

rolling direction shall

be

added as an index figure5

The applied strain value,

if

not

20

, shall be give

as

an

index figure y

B.1.3 The symbol

n

shall be completed by an index

figurex giving the orientation

of

the

test

piece relative

to the rolling direction and by an index

figure

y

giving

the upper limit of the strain range

if

the latter

is

not

the standard value of 20

.

B.1.4 The weighted average of n, values

is

calculated

using the formula.

n45/18

no +

o +

2n45

4

B.2 Principle

The test involves uniaxkd tensile s tmin ing

of

the

test

piece at the prescribed rate in the interval including

the region of the uniform plastic strain.

The

strain

hardening exponent

is

determined within

the strain range of 10 to

2096

As he determination

shall

be

carried out in the range of homogeneous

deformation, then if the uniform elongation of the

tested

material

is

lower than

20

ohvalues for the upper

limit of the strain range of

15 to

20 can be applied

Table B. l

f i =

3ymbol Unit

Original extensometer gauge length

of the

test

piece

CO

c

Instasitaneo& gasëlength of the

test

piece after instantaneous action

of

the force

F

mm

Original

m s s

section of the gauge

part

of the test piece

Instantaneoüs cross section of the

gauge part of the test piece after

instantaneous action of the force

F

L O

s =

so-

L

Instantaneous true strain after

instantaneous action of the force F

L

E = ln-

LO

Instantaneous true

stress

after

instaneous action of the force

F

F L

c = -

x -

Lo so

Instantaneous force applied to the

test piece

Annex

B

(normative)

Method of

determination of strain

hardening exponentn

NOTE

his annex

is based

upon

the

procedures

being

developed

by ISOiTC164BC2.

B.l Definition, symbols and designations

B.l.l Symbols and designations used in determjning

the strain hardening exponent are given

in

làble B.l.

B.1.2 The strain hardening exponent n

s

defined as

an exponent

in

the mathematical equalion of the

relation between true

stress

and true

strain

(during

uniaxial application of the force):

F

N

Strain

hardening exponent

Strength coefficient

Strain hardening exponent ratio in

directionx (in degrees) relative to

the rolling direction for the

strain

level y

Weighted average of

n.

values

N

Number of measurements for

determination of strain hardening

exponent

o=

En

i n o = l n K + n l n e

or in

the

logarithmic form:

'1

in

some

countries

n,

is

used instead

of

a.

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5

Page 12

EN 101391997

Germany

France United I d Y

Belgium

Sweden S P h

Kingdom

DIN

NF

BS

UNI

NJ3N

ss UNE

50133

Ao3154 427 1955

All-107 - 7423

in

this

case

the upper

strain

limit shall be given as

index

y

(see B.1.3 .

B.3

Testing

equipment

B.3.1 The testing machine and method of gripping

shaìl comply with the requirements of EN 10002:

Parîsland2.

B.3.2 The

accuracy

of the extensometer used shall be

class 1or better accordingto EN 10002-4.

B.4

Test

piece

B.4.1 The sampling and preparation of the test piece

shall be in accordance with EN 10002:Part 1,the test

piece type is no 2

(80d 0

m).

B.4.2 The gauge length shallbe between

50

nun

and

80 mm

but preferably

80

mm.

The gauge length

shall

be measured

within

Q,Ol

mm

using

a

device

B.6 Procedure

B.6.1 in general, the test is carried out

at

ambient

temperature between 10 C and 35 C. 'ksls carried out

under controlled conditions

shall

be made at a

temperaimeof 23 C

f

5 C.

B4.2 The test piece shail be mounted in the

testing

machineso that the force can be applied axially in

accordance

w i t h

EN lOOO2Part

1.

B 6 3

The

speed

of

the machine,

as

defined by the

speed

of separation of the

crossheads

of the machine,

expressed

as

a

percentage of the parallel length per

minute,shall in no case exceed50.This speed

sh ll

be

kept constant in the time in tend over which the

tensile

hardening exponent

is

cal-

B.6.4 The force and corresponding

shain

&ali be

recoded

at

a minimum of 5 points, distributedat equal

distances

within

the simin range of 10% to20% (10%

to 15

...18

refer to B.2 for whkh the

strain

hardening exponent is

calculated.

havillgadequab?accuracy

B.6.6 From the values of the force and the

correspondingstrain the true stress

shall

be calculated

using the form&

and the true

strain shail

be calculated

using

the

formula:

L

&=In-

O

and the logarithms of these values

shall

be obtained

B.6.6 The n value is calculatedusing the formda

given below, the standard formula for calculabng the

inclination of

a

stmight line using the statistical

method of

least

squares:

where

with

Y = A x B

y = lna

x = n e

A = n

B = h K

B.6.7 Calculated values of the strain hardening

exponent,n hali

be

rounded

to

0,005.

B.6.8

In

the case of

dispuk

the testi ng

shall

be

carried out with three test pieces of the specified

orientation r e w e

o

the r o h g direction. The avemge

value of the

three

tests

shall

be considered.

B.6 Test report

The orientation of the appìied

strajn

relative

to

the

roiling directionshall be added as an index figure x,

the upper

limt

of the appiiedstrajn range, if not 20

shallbe given as an index figure y

Annex C

(inforniative)

List

of

national

standards

complying

with

the Euronorms given in the references

=

-

)

Una they are transformed into Europeanstandards,either the Euronorms or the correspondingnational

standards

given in 'ïàble C.l may

be

used

Table C . l - Euronorms and corresponding national standards

I l I I I I

18

- IA

OS111

I 1449/1 I UNI-EU

18

I A

o3001

I 110120

I

11

0105

49

l -

I- 1

l -

I -

IISO4288

O

BSI 1998opyright European Committee for Standardizationrovided by IHS under license with CEN


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0708775

77Li

BS EN

101391998

BSI

389ChiswickHighW

London

w 4AL

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