FINAL DRAFT UGANDA 
STANDARD  
  FDUS EAS 412-2 
First  Edition  
2013-mm-dd 
 
 Reference number  
FDUS EAS 412-2: 2013 
© UNBS 201 3 
  
Steel fo r the reinforcement of concrete — Part 2: Ribbed  bars  
 FDUS EAS 412-2: 2013 
ii                © UNBS  2013 - All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. User s are 
responsible for its correct application  
© UNBS 20 13 
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm , without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 505 995  
Fax: 256 41 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  
 FDUS EAS 412-2: 2013 
© UNBS  2013 - All rights reserved                 iii National foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry established under Cap 327, of the Laws of Ugan da. UNBS is mandated to co -ordinate the elaboration 
of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT/SPS Agreements of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of repres entatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
This Final Draft Uganda Standard, FDUS EAS 412-2: 2013, Steel for the reinforcement of concrete — Part 2: 
Ribbed  bars, is identical with  and has been reproduced from an East African  Standard , EAS 412-1: 2013 , 
Steel for the reinforcement of concrete — Part 2: Ribbed  bars, and is being proposed for adoption as a 
Uganda Standard.  
Wherever the words, “ East African  Standard" appear, they should be replaced by "Uganda Standard."  
 
   FDEAS 412 -2: 2013  
ICS 77.140.20  
© EA C 2013                                                                                                                         Second Edition 2013   
 
FINAL DRAFT EAST AFRICAN STANDARD  
Steel for the re inforcement of concrete — Part 2 : Ribbed  bars  
EAST AFRICAN COMMUNITY  FDEAS 412 -2: 2013  
ii © EAC 2013  – All rights reserved  
 Copyright notice  
This EAC document is copyright -protected by EAC. While the reproduction of this document by 
participants in the EAC standards development process is permitted without prior permission from EAC, 
neither this document nor any extract from it may be reproduced, stored or transmitted in any form for 
any other purpose without prior written permission from EAC.  
Requests for permission to reproduce this document for the purpose of selling it should be addressed  
as shown below or to EAC’s member body in the country of the requester:  
© East African Community  2013  — All rights reserved  
East African Community   
P.O.Box 1096  
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Tanzania  
Tel: 255 27 2504253/8  
Fax: 255 27 2504481/2504255  
E-mail: eac@eachq.org  
   Web: www.eac -quality.net  
Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.  
Violators may be persecuted  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Symbols  ................................ ................................ ................................ ................................ ..................  1 
4 Terms and definiti ons ................................ ................................ ................................ ...........................  2 
5 Dimensions, masses per unit length and permissible deviations  ................................ ...................  4 
6 Requirements for ribs  ................................ ................................ ................................ ...........................  4 
7 Chem ical composition  ................................ ................................ ................................ ..........................  7 
8 Mechanical properties ................................ ................................ ................................ ...........................  8 
8.1 Tensile properties  ................................ ................................ ................................ ................................ .. 8 
8.2 Bending properties  ................................ ................................ ................................ ................................  9 
8.3 Rebending properties after ageing  ................................ ................................ ................................ .... 10 
8.4 Fatigue properties  ................................ ................................ ................................ ...............................  10 
9 Testing  ................................ ................................ ................................ ................................ ..................  10 
9.1 Tensile test  ................................ ................................ ................................ ................................ ...........  10 
9.2 Bend test  ................................ ................................ ................................ ................................ ..............  10 
9.3 Rebend tes t ................................ ................................ ................................ ................................ ..........  11 
9.4 Fatigue test  ................................ ................................ ................................ ................................ ..........  11 
9.5 Chemical analysis  ................................ ................................ ................................ ...............................  11 
10 Designation  ................................ ................................ ................................ ................................ ..........  11 
11 Marking  ................................ ................................ ................................ ................................ .................  11 
11.1  Marking on the bar  ................................ ................................ ................................ ..............................  11 
11.2  Marking of bundles  ................................ ................................ ................................ ..............................  12 
12 Evaluation of conformity  ................................ ................................ ................................ ....................  12 
12.1  General  ................................ ................................ ................................ ................................ .................  12 
12.2  Certification scheme  ................................ ................................ ................................ ...........................  12 
12.3  Acceptance testing of a specific delivery  ................................ ................................ .........................  12 
12.3.1  General  ................................ ................................ ................................ ................................ .................  12 
12.3.2  Evaluat ion of characteristic values  ................................ ................................ ................................ ... 12 
12.3.3  Evaluation of specified minimum/maximum values  ................................ ................................ ........  14 
12.3.4  Test report  ................................ ................................ ................................ ................................ ............  14 
Bibliography  ................................ ................................ ................................ ................................ ......................  15 
 
 FDEAS 412 -2: 2013  
iv © EAC 2013  – All rights reserved  
 Foreword  
Development of the East African Standards has been necessitated by the need for harmonizing requirements 
governing quality of products and servic es in the East African Community. It is envisaged that through 
harmonized standardization, trade barriers that are encountered when goods and services are exchanged 
within the Community will be removed.  
In order to achieve this objective, the Community es tablished an East African Standards Committee mandated 
to develop and issue East African Standards.  
The Committee is composed of representatives of the National Standards Bodies in Partner States, together 
with the representatives from the private sectors and consumer organizations. Draft East African Standards 
are circulated to stakeholders through the National Standards Bodies in the Partner States. The comments 
received are discussed and incorporated before finalization of standards, in accordance with t he procedures 
of the Community.  
East African Standards are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expected to ensure that they always have the latest versions of the standards 
they are  implementing .  
FDEAS 412-2 was prepared by Technical Committee EASC/TC 035, Steel and steel products . 
This second  edition cancels and replaces the first  edition (EAS  412-2:2005 ) which has been technically  
revised.  
FDEAS  412 consists of the following parts, under the general title Steel for the reinforcement of concrete:  
 — Part 1: Plain bars  
— Part 2 : Ribbed  bars 
— Part 3: Welded fabric  
 
 FINAL DRAFT EAST AFRICAN STANDARD  FDEAS 412 -2: 2013  
 
© EAC 2013  – All rights reserved  1 
 Steel for the reinforcement of concrete — Part 2: Ribbed  bars  
1 Scope  
This part of FDEAS 412  specifies technical requirements for ribbed bars to be used as reinforcement in 
concrete.  
This part of FDEAS 412covers sixsteel grades not intended for welding ( B400A -R, B400B -R, B400C -R, 
B500A -R, B500B -R and B500C -R), and ninesteel grades (B400AWR, B400 BWR, B400CWR, B400DWR, 
B420DWR, B500AWR, B500BWR, B500CWR and B500DWR ) intended for welding ..  
The steel grades are designated with steel names allocated in accordance with ISO/TS 4949.  
NOTE  The first ―B‖ stands for steel for reinforcing concrete. The nex t 3 digits represent the specified characteristic 
value of upper yield strength. The fifth symbol stands for ductility class (4.5). The sixth symbol relates to welding; ― -‖ 
means not intended for welding and ―W‖ means intended for welding. The last ―R‖ sta nds for ribbed bar.  
This part of FDEAS 412 covers products delivered in straight lengths.  
The production process is at the discretion of the manufacturer.  
Ribbed bars produced from finished products, such as plates and railway rails, are excluded.  
2 Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendmen ts) applies.  
ISO 404, Steel and steel products — General technical delivery requirements  
ISO 10144, Certification scheme for steel bars and wires for the reinforcement of concrete structures  
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical 
composition  
ISO 15630 -1, Steel for the reinforcement of concrete and prestressing of concrete — Test methods — Part 1: 
Reinforcing bars, wire rod and wire  
ISO/TR 9769, Steel and iron — Review of available methods of analysis  
ISO/TS 4949, Steel names based on letter symbols  
3 Symbols  
The symbols used in this part of FDEAS 412  are listed in Table 1.  
  FDEAS 412 -2: 2013  
2 © EAC 2013  – All rights reserved  
  
Table 1 — Symbols  
Symbol  Unit  Description  Reference  
a mm Rib height  4.10, Clause 6  
A5 % Percentage elongation  after fracture  8.1, 9.1  
Agt % Percentage total elongation at maximum force  8.1, 9.1  
An mm2 Nominal cross -sectional area  Clause 5, 9.1  
c mm Rib spacing  4.11, Clause 6  
d mm Nominal diameter of the bar  Clause 5, Clause 6, 9.1, 9.2, 9.3, 
Clause 10, 11.2,   
Σfi mm Ribless perimeter  4.12, Clause 6  
fk — Required characteristic value  12.3.2.3  
fR — Relative rib area  4.9, Clause 6  
k, k' — Indices  12.3.2.3.1  
mn — Mean value of n individual values  12.3.2.3.1  
n — Number of individual values  12.3.2.3.1  
ReH N/mm2 Upper yield strength  8.1  
Rm N/mm2  Tensile strength  8.1  
Rp0.2 N/mm2 0.2 % proof strength, non -proportional 
extension  8.1  
sn — Standard deviation for n individual values  12.3.2.3.1  
xi — Individual value  12.3.2.3.1  
α degree  Transverse -rib flank inclination  4.14, Clause 6  
β degree  Angle between the axis of a transverse rib and 
the bar axis  4.15, Clause 6  
4 Terms and definitions  
For the purposes of this standard , the following terms and definitions shall apply.  
4.1  
cast analysis  
chemical analysis representative of the cast determined by the steelmaker in accordance with his own 
procedures  
4.2  
certification scheme  
certification system as related to specified products, processes or services to which the same particular  
standards and rules, and the same procedure, apply  
4.3  
characteristic value  
value having a prescribed probability of not being attained in a hypot hetical unlimited test series  
NOTE 1  Equivalent to fractile, which is defined in ISO 3534 -1. 
NOTE 2  A nominal value is used as the characteristic value in some circumstances.  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  3 
 4.4 
core  
part of the cross -section of the bar containing neither ribs nor indentations  
4.5 
ductility class  
classification of the ductility properties of reinforcing steels based on the value of the ratio of tensile strength to 
yield strength, as well as the elongation measured either as Agt or as A5 (see Table 6)  
4.6 
longitudinal rib  
uniform continuous rib par allel to the axis of the bar  
4.7 
nominal cross -sectional area  
cross -sectional area equivalent to the area of a circular plain bar of the nominal diameter  
4.8 
product analysis  
chemical analysis carried out on the product  
4.9 
relative rib area , fR 
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  
4.10  
rib height ,a 
distance from one point on the rib to the surface of the core, to be measured normal to the axis of the bar (see 
Figure 2 ) 
4.11  
rib spacing , c  
distance between the centres of two consecutive transverse ribs measured parallel to the axis of the bar (See 
Figure 1)  
4.12 
ribless perimeter , Σf 
i sum of the distances along the surface of the core between the end of the transverse ribs of adjacent rows 
measured as the projection on a plane perpendicular to the axis of the bar  
4.13  
transverse rib  
rib at an angle, either perpendicular or oblique, t o the longitudinal axis of the bar  
4.14  
transverse -rib flank inclination ,α  
angle between the flank of a transverse rib and the core surface of a bar measured perpendicular to 
thelongitudinal axis of the transverse rib  (see Figure 2 ) 
4.15  
transverse -rib inclination β  
angle between the rib and the longitudinal axis of the bar (see Figures 1, 3 and 4 ) FDEAS 412 -2: 2013  
4 © EAC 2013  – All rights reserved  
 5 Dimensions, masses 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, plain bars whose nominal diameters are other than those shown in Table 2 may 
be used.  
Table 2 — Dimensions, mass per uni t length and permissible deviations  
 
Nominal bar 
diameter a, d, 
mm Nominal cross -
sectional area b, An, 
mm2 Mass per unit length  
Requirement c, 
kg/m  Permissible deviation 
d, 
% 
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 1257  9.86 ±4 
50 1964  15.42 ±4 
a Diameters larger than 5 0 mm should be agreed between the manufacturer and purchaser. The 
permissible deviation on such bars shall be ± A %.  
b             
c                                
d Permissible deviation refers to a single bar.  
 
Delivery length is subject to agree ment  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, permissible deviation on delivery length from rolling mill shall be 
0100 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 confor m to the requirements in Table 3.  
 FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  5 
 Table 3 — Requirements for ribs  
Rib parameter  Nominal diameter d, 
mm Ribs of uniform 
height  Crescent -shaped 
ribs 
Rib height,  a,min. All 0.05d 0.065d 
Rib spacing, c Range  6 ≤d<10 
d≥ 10 0.5d≤c≤ 0.7d 
0.5d≤ c ≤ 0.7d 0.5d≤ c ≤ 1.0d 
0.5d≤ c ≤ 0.8d 
Transverse -rib inclination, β  All 35° ≤ β ≤ 90° 35° ≤ β ≤ 75° 
Transverse -rib flank inclination, 
α All α ≥ 45° α ≥ 45° 
Ribless perimeter, Σfimax. All - 0.25dπ 
 
Requirements for rib parameters may be specified by the relative rib area, 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 4.  
When longitudinal ribs are present, their height shall not exceed 0 .15d. 
 
 
Key  
1 longitudinal rib  
2 transverse rib  
Figure 1 —Geometry forribbed bar  
  
FDEAS 412 -2: 2013  
6 © EAC 2013  – All rights reserved  
  
Key  
1 rib  
2 rounded transition  
Figure 2 — Rib flank inclination, α, and rib height, a — 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°)  
FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  7 
 7 Chemical  composition  
The chemical composition of the steel, as determined by cast an alysis, shall conform to Table 4 . The carbon 
equivalent, CEV, is calculated according to the following formula.  
 
15 5 6Ni Cu MoVCr MnC CEV
 (1) 
where C, Mn, Cr, V, Mo, Cu and Ni are th e mass fractions, expressed as percentages, of the respective 
chemical elements of the steel.  
The permissible deviation of the product analysis relative to the cast analysis as specified in Table 4 are given 
in Table 5 . 
Table 4 — Chemical composition base d on cast analysis — Maximum values of mass fractions, in 
percentag e 
Steel grade  Ca Si Mn P S Nb CEVa, c 
B400A -R B400B -R 
B400C -R B500A -R 
B500B -R B500C -R — — — 0.060 0.060 — — 
B400AWRdB400BWR 
B400CWR B500AWR 
B500BWR B500CWR  0.22 0.60 1.60 0.050 0.050 0.012 0.50 
B350DWR  0.27 0.55 1.60 0.040 0.040 0.012 0.51 
B400DWR  0.29 0.55 1.80 0.040 0.040 0.012 0.56 
B420DWRd 0.30 0.55 1.50 0.040 0.040 0.012 0.56 
B500DWR  0.32 0.55 1.80 0.040 0.040 0.012 0.61 
a For B400AWR, B400BWR, B400CWR, B500AWR, B500BWR and B500CWR with diameters larger than 32 mm, the maximum 
carbon content (C) is 0 .25 % and the maximum carbon equivalent (CEV) is 0 .55 %.  
b A higher mass fraction of nitrogen may be used, if sufficient quantities of nitrogen -binding elements are present.  
c Other CEV formulae and values may be used by agreement between the manufacturer and purchaser.  
d Alloy elements, such as Cu, Ni, Cr, Mo, V, Nb, Ti and Zr, may be added by agreement between the manufacturer and purchaser.  
 FDEAS 412 -2: 2013  
8 © EAC 2013  – All rights reserved  
 Table 5 — Chemical composition based on product analysis — Permissible deviation of the product 
analysis in percentage by mass  
Elements  Specified maximum value in 
cast analysis in Table 4 , 
%  Permissible deviation in product 
analysis from the specified l imits 
of the cast analysis in Table 4 , 
%  
C  ≤ 0.25  + 0.02  
> 0.25  + 0.03  
Si  ≤ 0.60  + 0.05  
Mn  ≤ 1.65  + 0.06  
> 1.65  + 0.08  
P  ≤ 0.05  + 0.008  
> 0.05  + 0.010  
S  ≤ 0.05  + 0.008  
> 0.05  + 0.010  
N  ≤ 0.012  + 0.002  
 
8 Mechanical  properties  
8.1 Tensile properties  
The tensile test shall b e performed in accordance with 9 .1. The material shall conform to the requirements for 
tensile properties specified in Table 6.  
In the context of this part of FDEAS 412 , 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 −α = 0. 90) that 95 % ( p= 
0.95) of the values are at or above this lower limit, or are at or be low this upper limit, respectively. This 
definition refers to the long -term quality level of production.  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  9 
 Table 6 — Tensile properties  
Ductility class  Steel 
grade  Specified 
characteristic value 
of upper yield 
strength R eH, 
N/mm2 Ductility properties  
Specified 
characteristic 
value of 
Rm/ReH Specified characteristic 
value of elongationa, 
% 
Minimum  Maximum  Minimum  A5 
Minimum  AgtMinimum  
A 
 B400A -R 
B400AWR  400 — 
1.02 14 2 
B500A -R 
B500AWR  500 — 
B B400B -R 
B400BWR  400 — 
 
1.08 14 5 
B500B -R 
B500BWR  500 — 
C 
 B400C -R 
B400CWR  400 — 
 
1.15 14 7 
B500C -R 
B500CWR  500 — 
D 
 B350DWR  350 
1.3 × 
ReH(min.)  1.25 17b 
8 
B400DWR  400 
B420DWR  420 16b 
B500DWR  500 13b 
a By agreement between the manufacturer and purchaser, the type of elongation shall be selected between A 5 and A gt. If the type of 
elongation is not specified by agreement, Agt should be used.  
b In the case of the bars with diameter 32 mm or more in ductili ty 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 characteristi c value 
stated in Table 6 is limited to 4 %.  
 
By agreement between the manufacturer and purcha ser, the values shown in Table 6  may be used as 
specified minimum and/or maximum values.  
If a yield p henomenon is not present, the 0. 2 % proof strength ( Rp0.2) shall be determined.  
8.2 Bending properties  
If required by the purchaser, the bend test shall be performed in accordance with 9.2. After testing , the bar 
shall show neither rupture nor cracks visible to a person of normal or corrected vision.  FDEAS 412 -2: 2013  
10 © EAC 2013  – All rights reserved  
 8.3 Rebending properties after ageing  
Regarding 15steel grades of B400A -R, B400B -R, B400C -R, B400AWR, B400BWR, B400CWR, B400DWR, 
B420DWR, B500A -R, B500B -R, B500C -R, B500AWR, B500BWR, B500CWR and B500DWR, if required, the 
rebend test shall be performed in accordance with 9.3.  
NOTE  The re -bend test is used to ve rify the ageing properties of the bent bars.  
After testing, the bars shall show neither rupture nor cracks visible to a person of normal or corrected vision.  
8.4 Fatigue properties  
If required by the purchaser, the manufacturer shall demonstrate the fati gue properties of the product based 
on axial -force -controlled fatigue testing in the fluctuating tension range in accordance with 9.4.  
The specified number(s) of stress cycles, stress range(s) 2σa and maximum stress(es) σmax shall be as agreed 
between the purchaser and manufacturer at the time of enquiry and order.  
9 Testing  
9.1 Tensile test  
The tensile test shall be carried out in accordance with ISO 15630 -1.  
For the determination of percentage elongation after fracture, A5, the original gauge length shal l be 5 times the 
nominal diameter.  
For the determination of percentage total elongation at maximum force, Agt, equidistant marks shall be made 
on the free length of the test piece. The distance between the marks shall be 20 mm, 10 mm or 5 mm, 
depending on  the bar diameter.  
For determination of tensile properties, the nominal cross -sectional area of the bar shall be used.  
9.2 Bend test  
The bend test shall be carried out in accordance with ISO 15630 -1.  
The test piece shall be bent to an angle between 160°  and 180° over a mandrel of t he diameter specified in 
Table 7 . 
Table 7  — Mandrel diameter to be used for the bend test  
Dimensions in millimetres  
Nominal diameter d Mandrel diameter (max.)a b 
≤ 16 3d 
16 <d≤ 32 6d 
32 <d≤ 50 7d 
a For nominal diameters larger than 50  mm, the mandrel diameters in bend tests shall be agreed 
between the manufacturer and purchaser.  
b By agreement between the manufacturer and purchaser, larger mandrel diameters may be used.  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  11 
 9.3 Rebend test  
The rebend test shall be carried ou t in accordance with ISO 15630 -1. The test piece shall be bent over a 
mandrel of the diameter specified in Table 8.  
The angle of bend before heating (ageing) shall be at least 90°, and the angle of rebend shall be at least 20°. 
Both angles shall be measured before unloading.  
Table 8 — Mandrel diameter to be used for the rebend test  
Dimensions in millimetres  
Nominal diameter ,d Mandrel diameter (max.) a, b 
≤ 16  5d 
16 <d≤ 25  8d 
25 <d≤ 50  10d 
a For nominal diameters larger than 50 mm, the mandrel diameter in rebend tests shall be agreed between 
the manufacturer and purchaser.  
b By agreement between the manufacturer and purchaser, larger mandrel diameters may be used.  
 
9.4 Fatigue test  
The fatigue test shall be carried out according to ISO 15630 -1.  
9.5 Chemical analysis  
In general, the chemical composition is determined by spectrometric methods.  
In case of dispute about the analytical method, the chemical composition shall be determined by an 
appropriate referee method specified in one of the International Standards listed in ISO/TR 9769.  
10 Designation  
Ribbed  bars ac cording to this part of FDEAS  412 shall be designated in the following order:  
a) reinforcing steel;  
b) a referenc e to this part of FDEAS 412 ; 
c) nominal diameter, in m illimetres, according to Table 2 ; and  
d) steel grade.  
EXAMPLE :  Reinforcing steel EAS 412 -2 — 12 B500CWR .  
11 Marking  
11.1 Marki ng on the bar  
All bars should be identifiable by marks introduced during rolling which indicate : 
a) the steel grade, and FDEAS 412 -2: 2013  
12 © EAC 2013  – All rights reserved  
 b) the name of the manufacturer.  
Some examples of multinational marking systems are shown in Annex A.  
11.2 Marking of bundles  
.Each bundle of bars shall have a label stating the following:  
a) name of the manufacturer ; 
b) a referenc e to this part of FDEAS 412;  
c) steel grade ; 
d) nominal diameter ; 
e) cast number or reference related to test record ; and  
f) country of origin.  
12 Evaluation of conformity  
12.1 General  
Certification and inspection of reinforcement shall be performed  
a) in accordance with a certification scheme monitored by an external body, or  
b) according to acceptance testing of a specific delivery.  
12.2 Certification scheme  
In the  case of a certification scheme, evaluation of conformity shall be performed in accordance with ISO 
10144.  
12.3 Acceptance testing of a specific delivery  
12.3.1 General  
Provisions regarding the nature, extent and evaluation of acceptance testing on deliver ies of reinforcing steel  
not subject to a cert ification scheme are given in 12.3.2 and 12 .3.3. Acceptance testing of a specific delivery 
shall be performed accord ing to 12 .3.2.By agreement between th e manufacturer and purchaser, 12 .3.3 may 
be used.  
12.3.2 Evalua tion of characteristic values  
12.3.2.1  Organization  
The tests shall be organized and carried out according to an agreement between the purchaser and 
manufacturer, taking into consideration the national rules of the receiving country.  
12.3.2.2  Exte nt of sampling and testing  
For the purpose of testing, the delivery shall be subdivided into test units with a maximum mass of 50 t or a 
fraction thereof. Each test unit shall consist of products of the same steel grade and the same nominal 
diameter from the same cast. The manufacturer shall confirm in the test report that all samples in the test unit 
originate from the same cast. The chemical composition (cast analysis) shall be stated in this test report.  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  13 
 Test pieces shall be taken from each test unit a s follows:  
a) two test pieces from various bars, for testing the chemical composition (product analysis); and 
b) a minimum of 15 test pieces (if appropriate, 60 test p ieces, see 12 .3.2.3.1) from various bars for 
testing all other properties sp ecified in this pa rt of FDEAS 412 .  
12.3.2.3  Evaluation of the results  
12.3.2.3.1  Inspection by variables  
For properties which are specified as characteristic values, the following shall be determined:  
a) all individual values xi of the 15 test pieces ( n = 15);  
b) the mean value m15 (for n = 15);  
c) the standard deviation s15 (for n = 15).  
The test unit corresponds to the requirements, if the condition stated below is fulfilled for all properties:  
kf s m 15 15 33.2
 (2) 
where  
fk is the specified characteristic value;  
2.33 is the value for the acceptability index k for n = 15 for a failure rate of 5 % (p = 0.95) at a probability 
of 90 % (1 −α = 0.90).  

142
15
15mxsi
 (3) 
If the condition stated ab ove is not fulfilled, the index  
1515 '
sf mkk
 (4) 
 
the index is determined from the test results available. Where k′≥ 2, testing can be continued. In this case, 45 
further test pieces shall be taken and tested from different bars in the test unit, so that a total of 60 test results 
are available (n = 60).  
The test unit shall be considered to comply with the requirements , if the condition stated below is fulfilled for 
all properties:  
kf s m 60 60 93.1
 (5) 
where 
1.93 is the value for the acceptability index k for n = 60 for a failure rate of 5 % (p = 0 .95) at a probability 
of 90 % (1 −α = 0. 90).  FDEAS 412 -2: 2013  
14 © EAC 2013  – All rights reserved  
 12.3.2.3.2  Inspection by attributes  
When testing properties are specified as maximum or minimum values, all results determined on the 15 test 
pieces shall comply with the requirements of th is part of FDEAS 412 . In this case, the test unit shall be 
considered to comp ly with the requirements.  
The tests may be continued when at most 2 results not conforming to the conditions occur. In this case, 45 
further test pieces from various bars in the test unit shall be tested, so that a total of 60 test results are 
available. The test unit complies with the requirements, if not more than 2 of the 60 results do not conform to 
the conditions.  
12.3.2.3.3  Chemical composition  
Both test pieces shall comply with the requi rements in this part of FDEAS 412 .  
12.3.3 Evalua tion of specified minimum/maximum values  
Tests shall be carried out according to the following : 
a) bars of the same cast shall constitute one group. For every 50 t or fraction thereof, one tensile test 
and one bend test shall be carried out for each bar diameter ; 
b) each individual test result shall meet the required values in Table 4, and the required bending 
properties in 7.2 ; 
c) one cast analysis shall be carried out for every cast to verif y chemical composition (Clause 7 ). 
Samples shall be taken in accordance with ISO 1 4284 ; 
d) if any test result does not meet the requirements, retests may be carried out, according to ISO 404 ; 
and 
e) the manufacturer shall submit a test report stating that the products of the delivery satisfy the 
chemical and me chanical properties defined in c lauses 6 and 7, and a confirmation that the other 
requi rements of this part of FDEAS 412  are fulfilled.  
12.3.4 Test report  
The test report shall contain the following information:  
a) designation of the reinforcing steel in accordance with this part of FDEAS 412;  
b) marking on the reinforcing steel ; 
c) date of testing;  
d) mass of the test unit; and 
e) test results.  FDEAS 412-2: 2013  
© EAC 2013  – All rights reserved  15 
 Bibliography  
[1] ISO 3534 -1, Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used 
in probability  
[2] ISO 16020, Steel for t he reinforcement and prestressing of concrete — Vocabulary  
[3] ISO/IEC Guide 2, Standardization and related activities — General vocabulary  
 
 
 
 
 
 FDEAS 412-2: 2013   
 
© EAC 2013 – All rights reserved