EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

DRAFTprEN 10138-3

September 2000

ICS 77.140.65

English version

Prestressing steels - Part 3: Strand

Armatures de précontrainte - Partie 3: Torons Spannstähle - Teil 3: Litze

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ECISS/TC 19.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations whichstipulate 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 languagemade by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the samestatus as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

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

EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T É E U R O P É E N D E N O R M A LI S A T I O NEUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG

Central Secretariat: rue de Stassart, 36 B-1050 Brussels

© 2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. prEN 10138-3:2000 E

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Page 2prEN 10138-3:2000

Contents Page

1 Scope.......................................................................................................................................4

2 Normative references.............................................................................................................4

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

4 Designation.............................................................................................................................5

5 Manufacture ............................................................................................................................6

6 Requirements .........................................................................................................................8

7 Evaluation of conformity .......................................................................................................10

8 Test methods..........................................................................................................................12

9 Delivery conditions ................................................................................................................12

Annex A (informative) Note on classes of convenience................................................................13

Annex B (informative) Note on new higher tensile strand sizes for future development ..........14

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Page 3prEN 10138-3:2000

Foreword

This Part of this European Standard has been prepared by SC2 'Prestressing steels' of the TechnicalCommittee ECISS/TC 19 'Concrete reinforcing and prestressing steels - Properties, dimensions,tolerances and specific tests' of which the Secretariat is held by BSI.

This European Standard has been prepared under mandate M115 given to CEN by the EuropeanCommission and the European Free Trade Association and supports essential requirements of theEU Construction Products Directive (89/106/EEC).

For relationship with the EU Construction Products Directive, see informative annex ZA, which is anintegral part of Part 1 of this European Standard and by which it becomes a harmonized EuropeanStandard.

EN 10138 is published in four parts, the other parts being:

EN 10138-1, Prestressing steels — Part 1: General requirements

EN 10138-2, Prestressing steels — Part 2: Wire

EN 10138-4, Prestressing steels — Part 4: Bars

All products placed on the market within the European Union and EFTA must be certificated inaccordance with annex ZA of Part 1 of this European Standard.

In accordance with the common rules of CEN/CENELEC the following member countries are obligedto adopt this standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland, United Kingdom.

Page 4prEN 10138-3:2000

1 Scope

This Part of this European Standard gives specific requirements for high tensile steel wire strandwhich has been given a stress relieving heat treatment.

It is applicable to strands of the following types:

a) 3-wire strand;

b) indented 3-wire strand;

c) 7-wire strand;

d) indented 7-wire strand;

e) 7-wire compacted strand.

NOTE General requirements are given in Part 1 of this European Standard.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constituteprovisions of this European Standard. For dated references, subsequent amendments to, or revisions of,any of these publications do not apply. However, parties to agreements based on this EuropeanStandard are encouraged to investigate the possibility of applying the most recent editions of thenormative documents indicated below. For undated references, the latest editions of the normativedocument referred to applies. Members of CEN/CENELEC maintain registers of currently valid EuropeanStandards.

EN 10016-4, Non-alloy rod for drawing and/or cold rolling —Part 4: — Specific requirements for rod forspecial applications

EN 10027-1, Designation system for steels — Part 1: Steel names, principal symbols

EN 10027-2, Designation system for steels — Part 2: Steel numbers

prEN 10138-1, Prestressing steels — Part 1: General requirements

CR 10260, Designation system for steel — Additional symbols

prEN ISO 15630-3, Steel for the reinforcement and prestressing of concrete — Test methods —Part 3: Prestressing steels

Page 5prEN 10138-3:2000

3 Terms and definitions

For the purposes of this Part of this European Standard the terms and definitions given inprEN 10183-1 and the following apply.

3.1unit of productproduct of one coil as delivered to the customer

3.2test unitunits of product coming from one set of coils in the stranding machine

4 Designation

4.1 For the steel grades covered by this Part of this European Standard the steel names shall beallocated in accordance with EN 10027-1 and CR 10260; the steel numbers shall be allocated inaccordance with EN 10027-2.

4.2 The designation shall consist of:

a) the number of this Part of this European Standard;

b) the steel name consisting of:

1) the letter Y for prestressing steel;

2) the nominal tensile strength in MPa;

3) the letter S for strand;

4) the number 3 or 7 to indicate the number of wires in the strand;

5) where appropriate, the letter G to indicate compacted strand;

c) the nominal diameter of the strand in mm;

d) Class A or B;

e) where necessary the letter I to indicate indented.

Page 6prEN 10138-3:2000

Example

EN 10138-3 Y 1860 S 7 16,0 A

Number of this Part ofthis European Standard

Prestressing steel

Nominal tensilestrength (MPa)

Strand

Number of wires

Nominal diameter (mm)

Class

i.e. EN 10138-3-Y1860S7-16,0-A

NOTE The steel number may be used instead of the steel name i.e. EN 10138-3-1.1366-16,0-A.

5 Manufacture

5.1 General

The strand shall be manufactured from wire produced from wire rod conforming to EN 10016-4 andfrom steel in accordance with prEN 10138-1:2000, 6.1.

5.2 Stranding process

5.2.1 3-wire strand

The strand shall consist of three wires of the same nominal diameter, spun together in helical formover a theoretical common axis with a lay length of 14 to 22 times the nominal strand diameter.

5.2.2 7-wire strand

The diameter of the straight central wire shall be at least 2,0 % greater than the diameter of the outerhelical wires. The latter shall be tightly spun around the centre wire with a lay length of between 14and 18 times the nominal strand diameter.

Page 7prEN 10138-3:2000

5.2.3 7-wire compacted strand

When stranding and compacting are carried out simultaneously, the straight central wire shall be atleast the same diameter as the outer helical wires. The latter shall have a lay length of 14 to 18 timesthe nominal strand diameter.

5.3 Welds

The normal production lengths may contain welds made in the individual wires before drawing, butshall not contain any welds made during or after drawing.

5.4 Indented strand

The indented wires of 3-wire strand or the indented outer wires of 7-wire strand shall be indentedbefore stranding.

NOTE 1 The centre wire of 7-wire strand is normally plain.

The dimensions of the indentation shall be in accordance with Table 1 and Figure 1 of this Part of thisEuropean Standard. One line of indentations shall be at a contrary angle to the others.

NOTE 2 Alternative methods may be used to improve the bond between strand and concrete.

Table 1 — Specified indentation

Dimensions in mm

Nominalstrand

diameter

Nominaldepth

Depthtolerance

Length Pitch

d A l c

� 12 0,06 + 0,03 3,5 ± 0,5 5,5 ± 0,5

> 12 0,07 + 0,03 3,5 ± 0,5 5,5 ± 0,5

Figure 1 — Indentation

Page 8prEN 10138-3:2000

6 Requirements

6.1 General

Nominal and specified properties shall be in accordance with Tables 2 and 3 in this Part of thisEuropean Standard.

6.2 Behaviour during cutting

When the strand is cut, the individual wires either shall not unravel or shall be capable of beingrepositioned without difficulty.

6.3 Maximum bow height

When a length of 3-wire or 7-wire strand is lying free on a flat surface, the maximum bow height froma base line 1 m in length, measured to the inside of the curve, shall be not greater than 25 mm.

Pag

e 9

prE

N 1

0138

-3:2

000

Tab

le 2

— D

imen

sio

ns

and

pro

per

ties

of

stra

nd

sC

lass

Ste

el d

esig

nat

ion

No

min

al a

Sp

ecif

ied

Ste

el n

ame

Ste

elD

iam

eter

Ten

sile

Cro

ss-

Mas

s c

Per

mit

ted

Ch

arac

teri

stic

Max

imu

m v

alu

e o

fC

har

acte

rist

icN

um

ber

stre

ng

thse

ctio

nal

are

a c

dev

iati

on

on

on

valu

e o

fm

axim

um

fo

rce

valu

e o

f 0,

1 %

dR

m b

fS

nM

no

min

al m

ass

max

imu

m f

orc

e F

mF

m, m

axp

roo

f fo

rce

d Fp0

,1

Mm

MP

am

m2

g/m

%kN

kNkN

AY

1960

S3

1.13

615,

219

6013

,610

6±

226

,730

,522

,9Y

1860

S3

1.13

606,

518

6021

,116

5±

239

,244

,933

,86,

823

,418

343

,549

,837

,47,

529

,022

654

,061

,746

,4Y

1860

S7

1.13

667,

018

6030

234

±2

5665

489,

050

390

9310

680

11,0

7558

614

016

012

012

,593

726

173

198

149

13,0

100

781

186

213

160

15,2

140

1095

260

298

224

16,0

150

1170

279

319

240

Y17

70S

71.

1365

15,2

1770

140

1095

248

282

213

16,0

150

1170

265

302

228

18,0

200

1560

± 2

354

403

304

Y18

60S

7G1.

1372

12,7

1860

112

875

±2

209

238

180

Y18

20S

7G1.

1371

15,2

1820

165

1290

±2

300

342

258

Y17

00S

7G1.

1370

18,0

1700

223

1740

±2

380

436

327

BY

2160

S3e

5,2

2160

13,6

106

±2

29,4

33,7

26,2

Y20

60S

3e1.

1362

5,2

2060

13,6

106

±2

28,0

32,1

24,1

Y19

60S

3e1.

1361

6,5

1960

21,1

165

±2

41,4

47,3

35,6

Y21

60S

7e6,

8521

6028

,222

0±

260

,969

,752

,4Y

2060

S7e

1.13

687,

020

6030

234

±2

62,0

71,0

53,0

Y19

60S

71.

1367

9,0

1960

5039

0±

298

112

84

a The

nom

inal

mod

ulus

of e

last

icity

may

be

take

n to

be

195

GP

a (k

N/m

m2 ).

b The

nom

inal

tens

ile s

tren

gth

is c

alcu

late

d fr

om th

e no

min

al c

ross

sec

tiona

l are

a an

d th

e sp

ecifi

ed c

hara

cter

istic

max

imum

forc

e, r

ound

ed to

the

near

est 1

0 M

Pa.

c The

cro

ss-s

ectio

nal a

rea

is c

alcu

late

d fr

om th

e no

min

al m

ass

and

a de

nsity

of 7

,81

kg/d

m3 .

d T

he s

peci

fied

char

acte

ristic

0.1

% p

roof

forc

e is

app

roxi

mat

ely

86 %

of t

he s

peci

fied

char

acte

ristic

max

imum

forc

e.e 3

-wire

str

and

and

the

7-w

ire s

tran

d of

dia

met

er 6

,85

mm

and

7,0

mm

are

nor

mal

ly o

nly

used

for

pres

tres

sing

with

dire

ct b

ond.

f 1 M

Pa

= 1

N/m

m2 .

Page 10prEN 10138-3:2000

Table 3 — Additional requirements for strand

Property Specification

Minimum elongation at maximum force ,Agt, with Lo � 500 mm 3,5 %

Reduction in area at break Ductile wire breaks visible to the unaided eye

For initial forcecorresponding to

70 % Fm 2,5 % aMaximum relaxation at 1 000 h a,b

80 % Fm 4,5 % b

plain wire 190 MPa cFatigue load range Fr with upperlimit Fup according to 70 % actualmax. force

indented wire 170 MPa c

Stress corrosion testing withNH4SCN

Minimum Median

Steel in class A 2,0 h 5 h

Steel in class B 1,5 h 4 h

Maximum D-value of deflected tensile testapplies to 7-wire strand with a nominaldiameter > 12,5 mm and compacted strandonly

28 % b

a For specific applications the relaxation requirement may be varied by agreement between supplier and purchaser.b The requirement for 70% Fm is mandatory. Values for 80% Fm may be agreed between supplier and purchaser.c 1 MPa = 1 N/mm2.

7 Evaluation of conformity

7.1 Factory production control

7.1.1 General

The requirements in prEN 10138-1:2000, 7.1.1 shall be met.

Page 11prEN 10138-3:2000

7.1.2 Sampling and testing of finished products

7.1.2.1 Frequency of sampling and testing

The manufacturer shall sample and test in accordance with Table 4.

Table 4 — Frequency of sampling and testing forfactory production control of strand

Characteristic Sampling plan

— Mass per m (Cross sectional area)

— Maximum force

— 0,1 % proof force

— Reduction in area 1 per test unit

— Elongation at maximum force

— Indentation depth (only for indented wire strand)

— Straightness

— Special properties Frequency specified inprEN 10138-1:2000, 7.1.2.2

7.1.2.2 Evaluation of test results of a test unit

A test unit shall be deemed to conform to the requirements of this Part of this European Standard if allthe results are greater than or equal to the specified value for the mechanical properties (exceptmaximum value of maximum force) and within the tolerances for the maximum force and thegeometrical properties.

If this condition is not met, the following procedure shall be applied :

1) when the result for the maximum force or 0,1 % proof force is lower than the specified value, twoadditional samples shall be taken from two units of product of the same test unit other than the oneinitially tested.

These samples shall be submitted to tensile tests. The mean value of the three individual results shallbe calculated.

The test unit shall be deemed to conform to the requirements of this Part of this European Standard ifthis mean value is greater than or equal to the specified value.

Otherwise, the test unit shall be rejected and the manufacturer shall immediately take the measures torectify the fault.

Page 12prEN 10138-3:2000

2) when results for properties specified by a minimum and/or a maximum value do not conform to therequirements, two additional samples shall be taken from the test unit concerned by each failed result.

If the two additional results conform to the requirements, the unit of product shall be deemed tocomply with the requirements of this Part of this European Standard and no further check is needed.

If at least one of the two additional results does not conform to the specifications, the concerned unitof product shall be rejected and all the units of product from the test unit shall be tested for thedefective property(ies).

All units of product with non conforming results shall be rejected and the manufacturer shallimmediately take the measures to rectify the fault.

7.1.2.3 Assessment of long term quality level

The requirements in prEN 10138-1:2000, 7.1.2.2 shall be met.

7.2 Initial type testing

The requirements in prEN 10138-1:2000, 7.2 shall be met.

7.3 Continuous surveillance

The requirements in prEN 10138-1:2000, 7.3 shall be met.

8 Test methods

The test methods shall be in accordance with prEN ISO 15630-3.

9 Delivery conditions

9.1 Identification

The requirements in prEN 10138-1:2000, 9.1 shall be met.

9.2 Delivery documentation

The requirements in prEN 10138-1:2000, 9.2 shall be met.

9.3 Dimensions of unit of product

The dimensions of the unit of product shall be agreed at the time of ordering between the purchaserand the producer consistent with the restrictions in prEN 10138-1:2000, 9.3. The producer shall statethe coil dimensions.

9.4 Packaging and handling

The internal diameter of the coil shall be not less than 50 times the strand diameter of 7-wire strand,or 75 times the strand diameter of 3-wire strand.

Page 13prEN 10138-3:2000

Annex A (informative)

Note on classes of convenience

Table 2 of this Part of this European Standard gives examples of classes of convenience of productsmanufactured by various countries within the EU. Other sizes not contained in this table may beoffered for approval under the CPD provided that volume manufacture of these sizes already existswithin an EU country and the general rules as indicated in notes a to f of Table 2 of this Part of thisEuropean Standard are applied. The properties and special properties of these additional sizes orclasses of convenience shall be consistent with those required for nominated classes and size rangesin Tables 2 and 3 of this Part of this European Standard.

Page 14prEN 10138-3:2000

Annex B (informative)

Note on new higher tensile strand sizes for future development

It is apparent that new higher tensile ranges are currently under development by a number ofmanufacturers. It is proposed that these may be included as non aligned parts in this Part of thisEuropean Standard with the intention of their inclusion as fully integrated parts with full technicalapproval in future issues of the standard. For formulation of the new product properties the generalrules as indicated in notes a to f of Table 2 of this Part of this European Standard are applied. Theproperties and special properties of these additional new sizes in classes of convenience shall beconsistent with the properties required for existing nominated classes and size ranges in Tables 2 and3 of this Part of this European standard.