Steel for the reinforcement of concrete — Part 2: Ribbed bars

This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete. It is applicable to steel delivered in the form of bars, coils and de-coiled products. This document covers both weldable and non-weldable steels. It does not apply to ribbed bars produced from finished products, such as plates and railway rails. The production process is at the discretion of the manufacturer.

Aciers pour l'armature du béton — Partie 2: Barres à verrous

General Information

Status
Published
Publication Date
02-Oct-2019
Current Stage
6060 - International Standard published
Start Date
03-Oct-2019
Completion Date
03-Oct-2019
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INTERNATIONAL ISO
STANDARD 6935-2
Fourth edition
2019-10
Steel for the reinforcement of
concrete —
Part 2:
Ribbed bars
Aciers pour l'armature du béton —
Partie 2: Barres à verrous
Reference number
ISO 6935-2:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 6935-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO 6935-2:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 3

5 Dimensions, mass per unit length and permissible deviations........................................................................... 4

6 Requirements for ribs ..................................................................................................................................................................................... 5

7 Chemical composition ..................................................................................................................................................................................... 8

8 Mechanical properties .................................................................................................................................................................................10

8.1 Tensile properties ..............................................................................................................................................................................10

8.2 Bending properties ...........................................................................................................................................................................12

8.3 Rebending properties after ageing .....................................................................................................................................12

8.4 Fatigue properties .............................................................................................................................................................................12

9 Testing ..........................................................................................................................................................................................................................13

9.1 Tensile test ...............................................................................................................................................................................................13

9.2 Conditions of testing .......................................................................................................................................................................13

9.3 Bend test ....................................................................................................................................................................................................13

9.4 Rebend test ..............................................................................................................................................................................................13

9.5 Fatigue test ..............................................................................................................................................................................................14

9.6 Chemical composition ...................................................................................................................................................................14

10 Designation .............................................................................................................................................................................................................14

11 Marking .......................................................................................................................................................................................................................14

11.1 Marking on bars ..................................................................................................................................................................................14

11.2 Identification of bundles..............................................................................................................................................................15

12 Evaluation of conformity ...........................................................................................................................................................................15

12.1 General ........................................................................................................................................................................................................15

12.2 Evaluation of conformity during production .............................................................................................................15

12.3 Acceptance testing of a specific delivery .......................................................................................................................16

12.3.1 General...................................................................................................................................................................................16

12.3.2 Evaluation of characteristic values ...............................................................................................................16

12.3.3 Evaluation of specified minimum/maximum values .....................................................................18

12.3.4 Test report ..........................................................................................................................................................................18

Annex A (informative) Five examples of marking systems for ribbed bars ..............................................................19

Annex B (informative) Options for agreement between the manufacturer and purchaser .....................24

Bibliography .............................................................................................................................................................................................................................25

© ISO 2019 – All rights reserved iii
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ISO 6935-2:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO’s adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for

the reinforcement and prestressing of concrete.

This fourth edition cancels and replaces the third edition (ISO 6935-2:2015), which has been technically

revised. The main changes compared to the previous edition are as follows:
— Figures 1, 2, 3 have been revised;
— Figure 5, A.3, A.4 have been newly added;
— introduction of hot-rolled threaded reinforcing bar in Clause 3, 4, 6 and A.7.
A list of all parts in the ISO 6935 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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INTERNATIONAL STANDARD ISO 6935-2:2019(E)
Steel for the reinforcement of concrete —
Part 2:
Ribbed bars
1 Scope

This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete.

It is applicable to steel delivered in the form of bars, coils and de-coiled products. This document

covers both weldable and non-weldable steels. It does not apply to ribbed bars produced from finished

products, such as plates and railway rails.
The production process is at the discretion of the manufacturer.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/TR 9769, Steel and iron — Review of available methods of analysis

ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition

ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing

bars, rods and wire
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
cast analysis

chemical analysis representative of the cast determined by the manufacturer in accordance with its

own procedures

[SOURCE: ISO 16020:2005, 2.4.3, modified — “manufacturer” has replaced “steelmaker”.]

3.2
conformity assessment scheme

conformity assessment system related to specific objects of conformity assessment, to which the same

specified requirements, specific rules and procedures apply

Note 1 to entry: Conformity assessment schemes may be operated at an international, national or sub-national level.

Note 2 to entry: Certification, i.e. third-party attestation related to products, processes, systems or persons, is

applicable to all objects of conformity assessment except for conformity assessment bodies themselves, to which

accreditation is applicable.
© ISO 2019 – All rights reserved 1
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ISO 6935-2:2019(E)
3.3
characteristic value

value having a prescribed probability of not being attained in a hypothetical unlimited test series

Note 1 to entry: Equivalent to “fractile”, which is defined in ISO 3534-1:2006.

Note 2 to entry: A nominal value is used as the characteristic value in some circumstances.

[SOURCE: ISO 16020:2005, 2.4.10, modified —Note 2 to entry has been added.]
3.4
core
part of the cross section of a bar containing neither ribs nor indentations

[SOURCE: ISO 16020:2005, 2.2.5, modified — “wire” has been removed from the definition.]

3.5
ductility class

classification of the ductility properties of ribbed reinforcing bars based on the value of the ratio of

tensile strength to yield strength, as well as the elongation measured either as A or as A

Note 1 to entry: See Table 6.
3.6
hot-rolled threaded reinforcing bar

type of bar with threaded geometry over its entire surface with two flat parts on the longitudinal side

Note 1 to entry: This type of bar with external threads is generally connected to other threaded bars with

internally threaded couplers.
3.7
longitudinal rib
uniform continuous rib parallel to the axis of a bar

[SOURCE: ISO 16020:2005, 2.2.7.1, modified — “wire” has been removed from the definition.]

3.8
nominal cross-sectional area

cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter

[SOURCE: ISO 16020:2005, 2.2.15, modified — “wire” has been removed from the definition.]

3.9
product analysis
chemical analysis carried out on the product
[SOURCE: ISO 16020:2005, 2.4.4]
3.10
relative rib area

area of the projections of all transverse ribs within a defined length on a plane perpendicular to the

longitudinal axis of the bar, divided by this length and the nominal circumference

[SOURCE: ISO 16020:2005, 2.2.11, modified — “wire” has been removed from the definition.]

2 © ISO 2019 – All rights reserved
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ISO 6935-2:2019(E)
3.11
rib height

distance from the highest point on the rib to the surface of the core measured perpendicular to the axis

of a bar
Note 1 to entry: See Figure 2.

[SOURCE: ISO 16020:2005, 2.2.12, modified — “highest point” has replaced “one point”, “perpendicular”

has replaced “normal”, “wire” has been removed from the definition and Note 1 to entry has been added.]

3.12
transverse rib spacing

distance between the centres of two consecutive transverse ribs (3.4) measured parallel to the axis

of a bar
Note 1 to entry: See Figure 1.

[SOURCE: ISO 16020:2005, 2.2.10, modified — “wire” has been removed from the definition.]

3.13
part of the circumference without rib

sum of the distances along the surface of the core between the ends of the transverse ribs (3.4) of

adjacent rows measured as the projection on a plane perpendicular to the axis of a bar

[SOURCE: ISO 16020:2005, 2.2.13, modified — “or indentationless” has been removed from the term

and “or indentations” and “wire” have been removed from the definition.]
3.14
transverse rib

rib at an angle, either perpendicular or oblique, to the longitudinal axis of the bar

[SOURCE: ISO 16020:2005, 2.2.7.2, modified]
3.15
transverse rib flank inclination

angle between the flank of a transverse rib (3.4) and the core surface of a bar measured perpendicular

to the longitudinal axis of the transverse rib (3.4)
Note 1 to entry: See Figure 2.

[SOURCE: ISO 16020:2005, 2.2.9, modified — “wire” has been removed from the definition.]

3.16
transverse rib inclination
angle between the rib and the longitudinal axis of a bar
Note 1 to entry: See Figures 1, 3 and 4.

[SOURCE: ISO 16020:2005, 2.2.8, modified — “wire” has been removed from the definition.]

4 Symbols
For the purposes of this document, the symbols listed in Table 1 apply.
© ISO 2019 – All rights reserved 3
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ISO 6935-2:2019(E)
Table 1 — Symbols
Symbol Unit Description Reference
a mm Rib height 3.11, Clause 6
A % Percentage elongation after fracture 8.1
A % Percentage total extension at maximum force 8.1
S mm Nominal cross-sectional area Clause 5, 9.1
b mm Top width of transverse rib at the mid-point Clause 6
c mm Transverse rib spacing 3.12, Clause 6
d mm Nominal diameter of the bar Clause 5, Clause 6, 9.3, 9.4,
Clause 10, 11.1,11.2,
Σ mm Part of the circumference without rib 3.13, Clause 6
f — Required characteristic value 12.2, 12.3.2.3
f — Relative rib area 3.10, Clause 6
k, k' — Indices 12.3.2.3.1
m — Mean value of n individual values 12.3.2.3.1
n — Number of individual values 12.3.2.3.1
R MPa Upper yield strength 8.1
R MPa Tensile strength 8.1
R MPa 0,2 % proof strength, plastic extension 8.1
p0,2
s — Standard deviation for n individual values 12.3.2.3.1
x — Individual value 12.3.2.3.1
α degree Transverse rib flank inclination 3.15, Clause 6
β degree Transverse rib inclination 3.16, Clause 6
T mm width of longitudinal flat part of hot-rolled threaded bar Clause 6
a 2
1 MPa = 1 N/mm .
5 Dimensions, mass per unit length and permissible deviations

Dimensions, mass per unit length and permissible deviations are given in Table 2. By agreement

between the manufacturer and purchaser, ribbed bars for which the nominal diameters are other than

those shown in Table 2 may be used. A list of options for agreement between the manufacturer and the

purchaser is provided in Annex B.
4 © ISO 2019 – All rights reserved
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ISO 6935-2:2019(E)
Table 2 — Dimensions, mass per unit length and permissible deviations
Nominal bar Nominal cross- Mass per unit length
a b
diameter sectional area
d S Requirement Permissible
deviation
mm mm kg/m %
6 28,3 0,222 ±8
8 50,3 0,395 ±8
10 78,5 0,617 ±6
12 113 0,888 ±6
14 154 1,21 ±5
16 201 1,58 ±5
20 314 2,47 ±5
25 491 3,85 ±4
28 616 4,84 ±4
32 804 6,31 ±4
40 1 257 9,86 ±4
50 1 964 15,42 ±4

Nominal diameters larger than 50 mm should be agreed between the manufacturer and

purchaser. The permissible deviation on mass for such bars shall be ±4 %.
b 2
S = 0,785 4 × d .
c −3
Mass per unit length = 7,85 × 10 × S .
Permissible deviation refers to a single bar.

The delivery length is subject to agreement between the manufacturer and purchaser.

NOTE Common delivery lengths of straight bars are 6 m, 9 m, 12 m and 18 m.

Unless otherwise agreed, the permissible deviation on delivery lengths from the rolling mill shall

+100
be mm.
6 Requirements for ribs
Ribbed bars shall have transverse ribs. Longitudinal ribs may be present or not.

There shall be at least two rows of transverse ribs equally distributed around the perimeter of the bar.

The transverse ribs within each row shall be distributed uniformly over the entire length of the bar,

except in the area of marking.
Ribs shall conform to the requirements given in Table 3.
Table 3 — Requirements for transverse ribs
Nominal bar Ribs of uniform Crescent-shaped
diameter height ribs
Rib height, a
All 0,03d 0,03d
Minimum
Transverse rib spacing, c 6 ≤ d < 10 0,5d ≤ c ≤ 0,7d 0,5d ≤ c ≤ 1,0d
Range d ≥ 10 0,5d ≤ c ≤ 0,7d 0,5d ≤ c ≤ 0,8d
© ISO 2019 – All rights reserved 5
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ISO 6935-2:2019(E)
Table 3 (continued)
Nominal bar Ribs of uniform Crescent-shaped
diameter height ribs
Transverse rib inclination, β All 35° ≤ β ≤ 90° 35° ≤ β ≤ 75°
Transverse rib flank inclination, α All α ≥ 40° α ≥ 40°
Part of the circumference without
rib, Σ All — 0,25dπ
Maximum
Top width of transverse rib at the
6 ≤ d < 20 0,4d
mid-point, b 0,2d
d ≥ 20 0,2d
Maximum

Requirements for rib parameters may be specified by the relative rib area, or by agreement between

the manufacturer and purchaser. Measurement of rib parameters shall be performed in accordance

with ISO 15630-1.
Dimensions defining the rib geometry in Table 3 are shown in Figures 1 to 5.
When longitudinal ribs are present, their height shall not exceed 0,15d.

For transverse rib spacing of hot-rolled threaded bars, a minimum limit less than 0,5d may be agreed at

the time of enquiry and order, but the minimum limit shall not be less than 0,35d.

Key
1 longitudinal rib
2 transverse rib
Figure 1 — Ribbed bar — Definitions of geometry
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ISO 6935-2:2019(E)
Key
1 rib
2 rounded transition

Figure 2 — Rib flank inclination, α, rib height, a, and top width of transverse rib at the mid-

point, b — Section A-A from Figure 1
Figure 3 — Example of bar with varying rib inclinations to the longitudinal axis
Figure 4 — Example of bar with transverse ribs of uniform height (β = 90°)
© ISO 2019 – All rights reserved 7
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ISO 6935-2:2019(E)
3,,124××d 025
*maxT = ,minT =0

Figure 5 — Example of hot-rolled bar with threaded geometry and longitudinal flat part

7 Chemical composition

The chemical composition of the steel, as determined by cast analysis, shall conform to Table 4.

Calculate the carbon equivalent, CEV, according to Formula (1):
Mn (CrV++Mo) (CuN+ i)
CEVC=+ + + (1)
6 5 15

where C, Mn, Cr, V, Mo, Cu and Ni are the mass fractions, expressed as percentages of the respective

chemical elements of the steel.

In cases where product analysis is required, it shall be agreed at the time of enquiry and order. The

permissible deviation of the product analysis relative to the cast analysis as specified in Table 4 is given

in Table 5.
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ISO 6935-2:2019(E)

Table 4 — Chemical composition based on cast analysis — Maximum values of mass fractions,

in percentage
a, e b c b, d
Steel grade C Si Mn P S N CEV
B300A-R
B300B-R
B300C-R
B400A-R
B400B-R — — — 0,060 0,060 — —
B400C-R
B500A-R
B500B-R
B500C-R
B600A-R
B600B-R — — — 0,060 0,060 — —
B600C-R
B700A-R
B700B-R — — — 0,060 0,060 — —
B700C-R
B400AWR
B400BWR
B400CWR
0,22 0,60 1,60 0,050 0,050 0,012 0,50
B500AWR
B500BWR
B500CWR
B450AWR
0,22 — — 0,050 0,050 0,012 0,50
B450CWR
B300D-R — — — 0,050 0,050 — —
B300DWR 0,27 0,55 1,50 0,040 0,040 0,012 0,49
B350DWR 0,27 0,55 1,60 0,040 0,040 0,012 0,51
B400D-R 0,29 0,55 1,60 0,040 0,040 — 0,55

The first “B” stands for steel for reinforcing concrete. The next 3 digits represent the specified characteristic value of

minimum upper yield strength. The fifth symbol stands for ductility class. The sixth symbol relates to welding; “-” means

not intended for welding and “W” means intended for welding. The last “R” stands for ribbed bar.

For B400AWR, B400BWR, B400CWR, B500AWR, B500BWR and B500CWR with nominal diameters larger than 32 mm,

the maximum carbon content (C) is 0,25 % and the maximum carbon equivalent (CEV) is 0,55 %.

The maximum mass fraction of nitrogen may be 0,017%, if sufficient quantities of nitrogen-binding elements such as B,

Ti, Cr, Mo, V are intentionally added.

Other carbon equivalent (CEV) formulae and values may be used by agreement between the manufacturer and

purchaser.

Alloy elements, such as Cu, Ni, Cr, Mo, V, Nb, Ti and Zr, may be added by agreement between the manufacturer and

purchaser.

For B600D-R with nominal diameters larger than 32 mm. the maximum carbon content (c) is 0,40 % and the maximum

carbon equivalent (CEV) is 0,70 %.
If bars are manufactured purely by micro-alloying without quenching:

For B600D-R, the maximum C, Si and Mn shall be 0,45 %, 1,00 % and 2,00 % respectively.

The maximum carbon equivalent (CEV) shall be 0,58 % for B300DWR, 0,60 % for B350DWR, 0,65 % for B400D-R and

B400DWR, 0,66 % for B420DWR, 0,70 % for B500D-R and B500DWR, and 0,80 % for B600D-R.

© ISO 2019 – All rights reserved 9
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ISO 6935-2:2019(E)
Table 4 (continued)
a, e b c b, d
Steel grade C Si Mn P S N CEV
B400DWR 0,29 0,55 1,80 0,040 0,040 0,012 0,56
B420DWR 0,30 0,55 1,50 0,040 0,040 0,012 0,56
B500D-R 0,32 0,55 1,80 0,040 0,040 — 0,60
B500DWR 0,32 0,55 1,80 0,040 0,040 0,012 0,61
B600D-R 0,37 0,55 1,80 0,040 0,040 — 0,67
B700D-R 0,50 2,00 2,00 0,040 0,040 — 0,85

The first “B” stands for steel for reinforcing concrete. The next 3 digits represent the specified characteristic value of

minimum upper yield strength. The fifth symbol stands for ductility class. The sixth symbol relates to welding; “-” means

not intended for welding and “W” means intended for welding. The last “R” stands for ribbed bar.

For B400AWR, B400BWR, B400CWR, B500AWR, B500BWR and B500CWR with nominal diameters larger than 32 mm,

the maximum carbon content (C) is 0,25 % and the maximum carbon equivalent (CEV) is 0,55 %.

The maximum mass fraction of nitrogen may be 0,017%, if sufficient quantities of nitrogen-binding elements such as B,

Ti, Cr, Mo, V are intentionally added.

Other carbon equivalent (CEV) formulae and values may be used by agreement between the manufacturer and

purchaser.

Alloy elements, such as Cu, Ni, Cr, Mo, V, Nb, Ti and Zr, may be added by agreement between the manufacturer and

purchaser.

For B600D-R with nominal diameters larger than 32 mm. the maximum carbon content (c) is 0,40 % and the maximum

carbon equivalent (CEV) is 0,70 %.
If bars are manufactured purely by micro-alloying without quenching:

For B600D-R, the maximum C, Si and Mn shall be 0,45 %, 1,00 % and 2,00 % respectively.

The maximum carbon equivalent (CEV) shall be 0,58 % for B300DWR, 0,60 % for B350DWR, 0,65 % for B400D-R and

B400DWR, 0,66 % for B420DWR, 0,70 % for B500D-R and B500DWR, and 0,80 % for B600D-R.

Table 5 — Permissible deviation in product analysis in percentage by mass a
Elements Specified maximum value Permissible deviation in product
in cast analysis in Table 4 analysis from the specified limits of
the cast analysis in Table 4
≤0,25 +0,02
>0,25 +0,03
≤0,60 +0,05
>0,60 +0,07
≤1,65 +0,06
>1,65 +0,08
≤0,05 +0,008
>0,05 +0,010
≤0,05 +0,008
>0,05 +0,010
N ≤0,012 +0,002

In cases of product analysis, the maximum value of carbon equivalent (CEV) shall be as given in Table 4 with a tolerance

of 0,05.
8 Mechanical properties
8.1 Tensile properties
The tensile test shall be performed in accordance with 9.1.
10 © ISO 2019 – All rights reserved
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ISO 6935-2:2019(E)

The bars shall conform to the requirements for specified characteristic tensile properties specified in

Table 6.

In the context of this document, the characteristic value is (unless otherwise indicated) the lower

or upper limit of the statistical tolerance interval at which there is a 90 % probability (1 − t = 0,90)

that 95 % (p = 0,95) of the values are at or above this lower limit, or are at or below this upper limit,

respectively. This definition refers to the long-term quality level of production.

Table 6 — Tensile properties
Ductility properties
Specified characteristic
value of upper yield
Specified Specified
strength
characteristic characteristic value
Ductility
value of of elongation
Steel grade
Class
MPa
R /R %
m eH
A A
Minimum Maximum Minimum
Minimum Minimum
B300A-R 300 — 16
B400A-R
400 —
B400AWR
B500A-R 1,02 2
500 —
B500AWR
B600A-R 600 — 10
B700A-R 700 — 8
B450AWR 450 1,25 × R (min.) 1,05 — 2,5
300B-R 300 — 16
B400B-R
400 —
B400BWR
B B500B-R 1,08 5
500 —
B500BWR
B600B-R 600 — 10
B700B-R 700 — 8
B300C-R 300 — 16
B400C-R
400 —
B400CWR
B500C-R 7
500 —
C 1,15
B500CWR
B600C-R 600 — 10
B700C-R 700 — 8
B450CWR 450 1,25 × R (min.) — 7,5

By agreement between the manufacturer and purchaser, the type of elongation shall be selected between A and A . If

the type of elongation is not specified by agreement, A should be used.

For bars with nominal diameter equal to or greater than 32 mm in ductility class D, the minimum specified

characteristic value for A may be decreased by 2 % for each 3 mm increase in diameter. However, the maximum diminution

from the minimum specified characteristic value stated in Table 6 is limited to 4 %.

c 2
1 MPa = 1 N/mm .
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ISO 6935-2:2019(E)
Table 6 (continued)
Ductility properties
Specified characteristic
value of upper yield
Specified Specified
strength
characteristic characteristic value
Ductility
value of of elongation
Steel grade
Class
MPa
R /R %
m eH
A A
Minimum Maximum Minimum
Minimum Minimum
B300D-R —
300
B300DWR
B350DWR 350 17
B400D-R 1,3 × R (min.)
400
B400DWR
D 1,25 8
B420DWR 420 16
B500D-R 1,25 × R (min.)
500 13
B500DWR 1,3 × R (min.)
B600D-R 600 1,2 × R (min.) 10
B700D-R 700 1,2 ×
...

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