 DEAS 412-2:2022  
ICS 91.080 .40 
 
© EAC 2022                                                                                                                            Fourth  Edition 2022  
 DRAFT EAST AFRICAN STANDARD  
Steel for the reinforcement of concrete — Part 2: Ribbed  bars  
EAST AFRICAN COMMUNITY  DEAS 412-2:2022  
ii © EAC 2022  – All rights reserved  
 Copyright notice  
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© East African Community  2022  — All rights reserved  
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Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.  
Violators may be prosecuted . DEAS 412-2:202 2 
© EAC 2022  – All rights reserved  iii 
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references . ................................ ................................ ................................ ...........................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Symbols and/or abbreviated terms  ................................ ................................ ................................ ..... 3 
5 Requirements for dimensions, mass per unit length and permissible deviations  .........................  3 
6 Requirements for ribs  ................................ ................................ ................................ ...........................  4 
7 Chemical composition  ................................ ................................ ................................ ..........................  7 
8 Mechanical properties ................................ ................................ ................................ ...........................  8 
8.1 Tensile properties  ................................ ................................ ................................ ................................ .. 8 
8.2 Bending properties  ................................ ................................ ................................ ................................  9 
8.3 Rebending properties after aging  ................................ ................................ ................................ ...... 10 
8.4 Fatigue properties  ................................ ................................ ................................ ...............................  10 
9 Testing  ................................ ................................ ................................ ................................ ..................  10 
9.1 Tensile test  ................................ ................................ ................................ ................................ ...........  10 
9.2 Bend test  ................................ ................................ ................................ ................................ ..............  10 
9.3 Re-bend test  ................................ ................................ ................................ ................................ .........  11 
9.4 Fatigue test  ................................ ................................ ................................ ................................ ..........  11 
9.5 Chemical analysis  ................................ ................................ ................................ ...............................  11 
10 Designation  ................................ ................................ ................................ ................................ ..........  11 
11 Marking  ................................ ................................ ................................ ................................ .................  11 
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 
11.3.2 Evaluation of characteristic values  ................................ ................................ ................................ ... 12 
12.3.3  Evaluation of specified minimum/maximum values  ................................ ................................ ........  14 
 
 
 DEAS 412-2:2022  
iv © EAC 2022  – All rights reserved  
 Foreword  
Development of the East African Standards has be en necessitated by the need for harmonizing requirements 
governing quality of products and services in the East African Community. It is envisaged that through 
harmonized standardization, trade barriers that are encountered when goods and services are exch anged 
within the Community will be removed.  
The Community has established an East African Standards Committee  (EASC)  mandated to develop and 
issue East African Standards  (EAS) . The Committee is composed of representatives of the National 
Standards Bodies in Partner States, together with the representatives from the public and private sector 
organizations  in the community .  
East African Standards are developed through  Technical Committees that are representative of key 
stakeholders including government, aca demia, consumer groups, private sector and other interested parties. 
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 finali zation of standards, in 
accordance with the Principles and procedures for develop ment of East African Standards.  
East African Standards are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expec ted to ensure that they always have the latest versions of the standards 
they are implementing .  
The committee responsible for this document is Technical Committee EASC/TC 035, Steel and Steel  
Products . 
Attention is drawn to the possibility that some of th e elements of this document may be subject of patent 
rights. EAC shall not be held responsible for identifying any or all such patent rights.  
This third edition cancels and replaces the second  edition ( EAS 412-2:2013 ), which has been technically  
revised.  
EAS 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   
 
 DRAFT EAST AFRICAN STANDARD  DEAS 412-2:202 2 
 
© EAC 2022  – All rights reserved  1 
 Steel for the re inforcement of concrete — Part 2 : Ribbed  bars  
1 Scope   
This East African Standard  specifies technical requirements for ribbed  bars to be used as reinforcement in 
concrete.  
This part of EAS 412 covers:  
a) ribbed  bars supplied in straight lengths ; and  
b) eleven  steel grades not i ntended for welding which are,  B500A - R, B500B -R, B500C -R, B600A -R, 
B600B -R, B600C -R, B600D -R, B700A -R, B700B -R, B700C -R and B700D -R,  
and six steel grades intended  for welding which are , B500AWR, B500BWR, B500CWR , B500DWR,  
B550DWR and B600DWR . 
NOTE  The steel grades are designated with steel names allocat ed in accordance with ISO/TS 4949. The first ―B‖ 
stands for steel for reinforcing concrete. The next 3 digits represent the specified characteristic value of upper yield 
strength. The fifth symbol stands for ductility class (see 3.5). The sixth symbol rela tes to welding; ― -‖ means not intended 
for welding and ―W‖ means intended for welding. The last ―R‖ stands for ribbed bar.  
This standard does not apply to ribbed bars produced from finished products, such as plates and railway rails.  
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 referen ced document (including any amendments) applies.  
ISO/TR 9769, Steel and iron — Review of available methods of analysis  
ISO/TS 4949, Steel names based on letter symbols  
ISO 404, Steel and steel products — General technical delivery requirements  
ISO 10144, Steels for the reinforcement and prestressing of concrete — Certification scheme for steel bars 
and wires  
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical 
composition  
ISO 15630 -1, Steel f or the reinforcement  and prestressing of concrete — Test methods — Part 1:  Reinforcing 
bars, wire rod and wire  
3 Terms and definitions   
For the purposes of this document, the following terms and definitions apply.   
2 © EAC 2022  – All rights reserved  
 ISO and IEC maintain terminological databases for use in standa rdization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1 
cast analysis  
chemical analysis representative of the cast  determined by the manufacturer  in accordance wit h their 
procedures  
3.2 
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  
3.3 
characteristic value  
value having a prescribed prob ability of not being attained in a hypothetical unlimited test series  
3.4 
core  
part of the cross -section of the bar containing neither ribs nor indentations  
3.5 
ductility class  
classification of the ductility properties of reinforcing steels based on the v alue of the ratio of tensile strength to 
yield strength, as well as the elongation measured either as Agt or as A5 (see Table 6) 
3.6  
longitudinal rib  
uniform continuous rib parallel to the axis of the bar  
3.7 
nominal cross -sectional area  
cross -sectional a rea equivalent to the area of a circular plain bar of the nominal diameter  
3.8 
product analysis  
chemical analysis carried out on the product  
3.9 
relative rib area fR 
area of the projections of all transverse ribs within a defined length on a plane perpendi cular to the longitudinal 
axis of the bar, divided by this length and the nominal circumference  
3.10 
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)  
3.11  
rib spacing,  c 
distance between the centres of two consecutive transverse ribs measured parallel to the axis of the bar  (see 
Figure 1)  
3.12 
ribless perimeter , Σfi 
sum of the distances along the surface of the core between the end of the transverse ribs of adjacent row s 
measured as the projection on a plane perpendicular to the axis of the bar   
© EAC 2022  – All rights reserved  3 
 3.13  
transverse rib  
rib at an angle, either perpendicular or oblique, to the longitudinal axis of the bar  
3.14 
transverse -rib flank inclination α 
angle between the flank of a tran sverse rib and the core surface of a bar measured perpendicular to the 
longitudinal axis of the transverse rib  (see Figure 2)  
3.15 
transverse -rib inclination , β 
angle between the rib and the longitudinal axis of the bar ( see f igures 1, 3 and 4)  
4 Symbols a nd/or abbreviated terms  
The symbols used in this part of EAS 412 are listed in Table 1.  
Table 1 — Symbols  
Symbol  Unit Description  
a mm Rib height  
A % Percentage elongation after fracture  
Agt % Percentage total extension at maximum force  
S0 mm2 Nominal cross -sectional area  
b mm Top width of transverse rib at the mid -point  
c mm Transverse rib spacing  
d mm Nominal diameter of the bar  
Σei mm Part of the circumference without rib  
fk — Required characteristic value  
fR — Relative rib area  
k, k' — Indices  
mn — Mean value of n individual values  
n — Number of individual values  
ReH MPaa Upper yield strength  
Rm MPaa Tensile strength  
Rp0,2 MPaa 0,2 % proof strength, plastic extension  
sn — Standard deviation for n individual values  
xi — Individual value  
α degree  Transverse rib flank inclination  
β degree  Transverse rib inclination  
T mm width of longitudinal flat part of hot -rolled thre aded bar  
a    1 MPa = 1 N/mm2. 
 
5 Requirements for dimensions, mass per unit length and permissible deviations  
The delivery length of  bars shall be 6 m or 12 m permissible deviation on delivery length from rolling mill shall 
be 
0100 mm. However,  manufacturer and purchase r may agree on special ordered lengths upo n notification to 
the regulator .   
4 © EAC 2022  – All rights reserved  
 Dimensions, mass per unit length and perm issible deviations shall be as given in Table 2.  
Table 2 — Dimensions, mass per unit length and permissi ble deviations  
Nominal bar diametera 
d 
mm Nominal cross -
sectional areab 
An 
mm2 Mass per unit length  
Requirementc 
kg/m Permissible deviationd 
% 
6 28.3 0.222  6 
8 50.3 0.395  6 
10 78.5 0.617  5 
12 113 0.888  5 
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 
a Diameters larger han 50 mm shld be agreed beten the purchaser and manufacturer. The permsible deviaton n suc bars shall be ± 4 %.   
b An = 0.785 4 x a2 
c Mass per unit length = 7 .85 x 10-3 x An 
d Permissible deviation refers to a single bar  
 
6 Requirements for ribs  
Ribbed bars shall have transverse ribs. There shall be at least two rows of transverse ribs equally distributed 
around the perimeter of th e bar. The transverse ribs within each row shall be distributed uniformly over the 
entire length of the bar, except in the area of marking.  
Longitudinal ribs may or may not be present.  
Ribs shall conform to the requirements in Table 3.   
© EAC 2022  – All rights reserved  5 
 
Table 3 — Requireme nts for ribs  
 Nominal diameter  
d 
mm Ribs of uniform 
height  Crescent -shaped 
ribs 
Rib height, a, min. All 0.05d 0.065 d 
Rib spacing, c 
Range  6 ≤ d< 10 
d >10 0.5d ≤c ≤ 0,7 d 
0,5d ≤ c ≤ 0,7 d 0,5d ≤ c ≤ 1,0 d 
0,5d ≤ c ≤ 0,8 d 
Transverse -rib inclination, β All 35° ≤ β ≤ 90°  35° ≤ β ≤ 75°  
Transverse -rib flank inclination, α All α ≥45° α ≥45° 
Ribless perimeter, Σ fi, max  All  0.25 dπ 
 
Requirements for rib parameters may be specified by the relative rib area, by agreement between the 
manufacturer and purchaser. Meas urement 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 0.15 d. 
 
 
 
 
 
 
Key 
1. longitudinal rib  
2. transverse rib  
Figure 1 — Ribbed bar: Definitions of geometry   
6 © EAC 2022  – All rights reserved  
 
 
 
 
 
 
 
 
 
Key 
1. Rib 
2. Rounded tr ansition  
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°)  
  
© EAC 2022  – All rights reserved  7 
 7 Chemical composition  
The chemic al composition of the steel, as determined by cast analy sis, shall conform to Table 4. 
The carbon equivalent value, CEV, is calculated as follows:  
CEV = C

15NiCu
5MoVCr
6Mn   (1) 
where C, Mn, Cr, V, Mo, Cu and Ni are the mass fractions, expressed as per centages, of the respective 
chemical elements of the steel.  
Table 4  — Chemical composition based on cast analysis — Maximum values of mass fractions, in 
percentage  
Steel grade  a, e Cb Si Mn P S Nc CEV b, d 
B500A -R 
B500B -R 
B500C -R — — — 0,060  0,060  — — 
B600A-R 
B600B -R 
B600C -R — — — 0,060  0,060  — — 
B700A -R 
B700B -R 
B700C -R — — — 0,060  0,060  — — 
B500AWR  
B500BWR  
B500CWR  0,22 0,60 1,60 0,050  0,050  0,012  0,50 
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 
a The first ―B‖ stands for steel for reinforcing concrete. The next 3 digits represent the specified characteristic value of mi nimum upper 
yield strength. The fifth symbol stands fo r 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.  
b For B400AWR, B400BWR, B400CWR, B500AWR, B500BWR and B500CWR with nominal diameters larger t han 32 mm, the 
maximum carbon content (C) is 0,25 % and the maximum carbon equivalent (CEV) is 0,55 %.  
c 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 a dded.  
d Other carbon equivalent (CEV) formulae and values may be used by agreement between the manufacturer and purchaser.  
e Alloy elements, such as Cu, Ni, Cr, Mo, V, Nb, Ti and Zr, may be added by agreement between the manufacturer and purchaser.  
f For B 600D -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 %.  
g 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.  
 
The permissible d eviation of the product analysis relative to the cast analysis as specified in Table 4 are given 
in Table 5.  
8 © EAC 2022  – 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 limits of the cast analysis in Table 4  
% 
C ≤0,25  +0,02  
>0,25  +0,03  
Si ≤0,60  +0,05  
>0,60  +0,07  
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  
a 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 material sha ll conform to the requirements for tensile properties specified in Table 6 when tested in 
accordance with 9 .1. 
In the context of this standard , the characteristic value is (unless otherwise indicated) the lower or upper limit 
of the statistical tolerance i nterval 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 below this upper limit, respectively. This definition 
refers to the long -term quality level of production.   
© EAC 2022  – All rights reserved  9 
 Table 6 — Tensile properties  
 
 
 
Ductility 
class   
 
 
Steel grade  Specified 
characteristic value  
of upper yield 
strength  
ReH 
N/mm2 Ductility properties  
Specified 
characteristic 
value  of 
Rm/ReH Specified 
characteristic value 
of elongationa 
% 
 
Minimum   
Maximum   
Minimum  A 
Minimum  Agt 
Minimum  
 
A B500A -R 
B500AWR  500 - 1.02 14 2 
B600A -R 600 - 10 
B700A -R 700 - 8 
 
 
 
B B500B -R 
B500BWR  500 - 1.08 14 5 
B600B -R 600 - 10 
B700B -R 700 - 8 
 
 
C B500C -R 
B500CWR  500 -  
 
1.15  
14 7 
B600C -R 600 - 10 
B700C -R 700 - 8 
 
D B500D -R 500 
 1.25 × 
ReH (min. )  
1.25 13 b  
8 
B500DWR  1.3 x 
ReH(min.)  13 b 
B600D -R 600 1.2 x 
ReH(min.)  10 b 
B700DWR  700 1.2 x 
ReH(min.)  10 b 
a By agreement between the manufacturer and purchaser, the type of elongation shall be  selected between 
A5 and Agt. 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 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           1 MPa = 1 N/mm 2. 
 
By agreement between the manufacturer and purchaser, the values shown in  Table 6 may be used as 
specified minimum and/or maximum values.  
If a yield phenomenon 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 in 
accordance with 8.2, the bar shall show neither rupture nor cracks visible to a person of normal or corrected 
vision.   
10 © EAC 2022  – All rights reserved  
 8.3 Rebending properties after aging  
The rebend test shall be performed in accordance with 9.3.  After testing,  the bars shall show neither rupture 
nor cracks visible to a person of normal or corrected vision.  
NOTE  The rebend test is used to verify the aging properties of the bent bars.  
8.4 Fatigue properties  
If required by the purchaser, the manufacturer shall dem onstrate the fatigue 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 g auge length shall 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 m m, 
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 the diameter specified in 
Table 7 . 
Table 7  — Mandrel diameter to be used for the bend test  
Dimensions in millimetres  
Nominal bar 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 diameter in bend tests shall be agreed 
between the manufacturer and purchaser.  
b By agreement between the manufacturer and purchaser, larger mandrel diameters ma y be 
used.  
  
© EAC 2022  – All rights reserved  11 
 9.3 Rebend test  
The re bend test shall be carried out 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°, a nd the ang le of re bend shall be at least 20°. 
Both angles shall be measured before unloading.  
Table 8 — Mandrel  diameter to be used for the re bend test  
Dimensions in millimetres  
bar 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  
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 reference method specified in one of the International Standards listed in ISO/TR 9769.  
10 Designation  
Ribbed bars according to this standard shall be designated in the following order:  
a) a reference to this standard ; 
b) nominal diameter, in millimetres, according to Table 2;  and 
c) steel grade.  
EXAMPLE  
Reinforcing steel EAS 412 -2 – 12 B500CWR  
11 Marking  
11.1.1 Each bar shall be legibly and indelibly marked with the following:  
a) manufacturers name or logo;   
12 © EAC 2022  – All rights reserved  
 b) steel grade ; and  
c) nominal diameter  at interval of at most 1.5 m . 
11.1.2 Each bundle shall be marked with the following:  
a) manufacturers name or logo;   
b) steel grade;  
c) country of origin;  
d) nominal diameter ; and  
e) batch/ cast number at the time of dispatch from the manufacture premises.  
12 Evaluation of conformity  
12.1 General  
Certification and inspection of reinforcement shall be performed in accordance with a certification scheme 
monitored by an external body, or according to acceptance testing of a specific delivery.  
12.2 Certificatio n scheme  
In the case of a certification scheme, certification and inspection 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 deliveries 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 sh all be performed according to 12 .3.2. 
By agreement between th e manufacturer and purchaser, 12 .3.3 may be used.  
12.3.2 Evalu ation 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 count ry. 
12.3.2.2  Extent 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 nomina l 
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.  
Test pieces shall be taken from each test unit as follows:   
© EAC 2022  – All rights reserved  13 
 a) two test pieces from various bars, for testing the chemical composition (product analysis);  and 
b) a minimum of 15 test pieces (if app ropriate, 60 test pieces, see 12 .3.2.3.1) from various bars for 
testing all other properties specified in this standard . 
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);  and 
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:  
m15−2.33×  s15≥ƒk 
where  
fk   is the specified characteristic value;  and 
2.33    is the value for the acceptabilit y index k for n = 15 for a failure rate of 5 % ( p = 0.95) at a   
  probability of 90 % (1 − α = 0.9 0). 
s15 = 

142
15 imx  (3) 
If the condition stated above is not fulfilled, the i ndex  
k′ = 
15k 15
sf m  (4) 
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 res ults 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:  
m60 −1.93×  s60 >ƒk (5) 
where 1.93 is the value for the acceptability index k for n = 60 for a fai lure rate of 5 % ( p = 0.95) at a 
probability of 90 % (1 − α = 0.90).  
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  this standard. In this case, the test unit shall be considered to 
comply with the requirements.  
  
14 © EAC 2022  – All rights reserved  
 The tests  may be continued when at most two  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 two  of the 60 results do not conform 
to the conditions.  
12.3.2.3.3  Chemical composition  
Both test pieces shall comply wi th the requirements in this standard . 
12.3.3 Evalu ation of specified minimum/maximum values  
Tests shall be carried out according to the following:  
a) Bars of the same cast shall constitute one lot. For every 50 t or fraction thereof, one tensile test and 
one bend /re-bend  test shall be carried out for each bar diameter.  
b) Each individual test result shall meet the required values in Table 6, and the required bending 
properties i n 8.2 and 8.3 . 
c) One cast analysis shall be carried out for every cast to verif y chemica l composition (Clause 7 ). 
Samples shall be taken in accordance with ISO 14284 . 
d) If any test result does not meet the requirements, retests may be carried out, according to ISO 404.  
e) The manufacturer shall submit a test report stating that the products of the  delivery satisfy the 
chemical and mechanical  properties defined in Clauses 7 and 8 , and a confirmation that the other 
requirements of this standard are fulfilled.  
12.3.4 Test report  
The t est report shall contain but not limited to the following information:  
a) designation of the reinforcing steel in accordance with this  standard ; 
b) marking on the reinforcing steel ; 
c) date of testing;   
d) mass of the test unit; and  
e) test results.   
© EAC 2022  – All rights reserved  15 
 Bibliography  
[1] EAS 412-2: 2019 , Steel for the r einforcement of concrete —Part 2: Ribbed  bars.   
[2] IS 1786: 2008, High strength deformed bars and wires for concrete reinforcement -  Specification   
 [3] ISO 6935 -2: 2019 , Steel for the r einforcement of concrete — Part 2 : Ribbe d bars. 
 
 WD/412-2:2022    
 
© EAC 2022  – All rights reserved  
  
  