PUBLIC REVIEW DRAFT DRAFT UGANDA STANDARD  
  DUS DEAS 412-2 
Second  Edition  
2018-mm-dd 
 
 Reference number  
DUS DEAS 412-2: 2018 
© UNBS 2018 
   
Steel for the reinforcement of concrete — Part 2: Ribbed bars  
 
 PUBLIC REVIEW DRAFTDUS DEAS 412-2: 2018  
ii                © UNBS  2018 - 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. Users are 
responsible for its correct application  
© UNB S 2018 
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 PUBLIC REVIEW DRAFTDUS DEAS 412-2 : 2018  
© UNBS  2018 - All rights reserved                iii National foreword 
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  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 Agreement 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 representatives 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 Draft Uganda Standard, DUS DEAS 412-2:2018, Steel for the reinforcement of concrete —Part 2 : Ribbed 
bars, is identical with and has been reproduced from an East African Standard, EAS 412-2:2018, Steel for the 
reinforcement of concrete —Part 2 : Ribbed bars , and is being proposed for adoption as a Uganda Standard. 
This standard was developed by Mechanical engineering and metallurgy Standards Technical Committee 
(UNBS/TC 4).  
This second edition cancels and replaces the first edition (US EAS 412-2:2013), which has been technically 
revised.  
Wherever the words, “ East African Standard " appear, they should be replaced by "Uganda Standard." PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 
 
 
 
DRAFT EAST AFRICAN STANDARD 
 DEAS 412-2:2018- Steel for the reinforcement of concrete —
Part 2: Ribbed bars 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EAST AFRICAN COMMUNITY 
 
 
 
 
 
 
 
 
PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 
 
 
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may be prosecuted. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
Foreword 
Development of the East African Standards has been 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 exchanged 
within the Community will be removed.  
In order to achieve this objective, the Community established 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 the 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.  
DEAS 412-2was prepared by Technical Committee EASC/TC 035 TC Steel and Steel Products  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
EAST AFRICA DRAFT STANDARD 
 
 
 
 
 
 
 
Steel for the reinforcement of concrete —Part 2: Ribbed bars 
 
 
 
 
1 Scope 
 
This part of East Africa Draft Standard specifies technical requirements for ribbed bars to be used as 
reinforcement in concrete.  
 
This part of East Africa Draft Standard covers ten steel grades not intended for welding which are B300A- R, 
B300B-R, B300C-R, B300D-R, B400A-R, B400B-R, B400C-R, B500A- R, B500B-R and B500C-R, and eleven 
steel grades intended for welding which are B300DWR, B350DWR, B400AWR, B400BWR, B400CWR, 
B400DWR, B420DWR, B500AWR, B500BWR, B500CWR aB500DWR,B550DWR and B600DWR. 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 next 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” stands for ribbed bar.  
 
This part of East Africa Draft Standard 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 amendments) applies. 
 
ISO 404, Steel and steel products — General technical delivery requirements 
 
ISO/TS 4949, Steel names based on letter symbols 
 
ISO/TR 9769, Steel and iron — Review of available methods of analysis 
 
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 and prestressing of concrete — Test methods — Part 1: Reinforcing 
bars, wire rod and wire 
 
 
 
 
 
 
 
 
 
 
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                                                         DEAS 412-2  
3 Symbols 
 
The symbols used in this part of East Africa Draft Standard are listed in Table 1. 
 
Table 1 — Symbols  
Symbol  Unit Description  Reference  
    
a mm Rib height  4.10, Clause 6  
    
A
5 % Percentage elongation after fracture  8.1, 9.1  
A
gt % 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  
f
k — Required characteristic value  12.3.2.3  
fR — Relative rib area  4.9, Clause 6  
k, k' — Indices  12.3.2.3.1  
    
m
n — Mean value of n individual values  12.3.2.3.1  
n — Number of individual values  12.3.2.3.1  
    
R
eH N/mm2 Upper yield strength  8.1 
Rm N/mm2 Tensile strength  8.1 
R
p0,2 N/mm2 0,2 % proof strength, non -proportional extension  8.1 
sn — Standard deviation for n individual values  12.3.2.3.1  
x
i — 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 document, the following terms and definitions apply. 
 
4.1  
cast an alysis  
chemical analysis representative of the cast determined by the manufacturer in accordance with his /her 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 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
4.3  
characteristic value  
value having a prescribed probability of not being attained in a hypothetical unlimited test series 
 
NOTE 2  A nominal value is used as the characteristic value in some circumstances. 
 
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 A 5 
 
NOTE  See Table 6. 
 
4.6  
longitudinal rib  
uniform continuous rib parallel 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 
 
NOTE 1  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 
 
NOTE 1  See Figure 1. 
 
 
4.12  
ribless perimeterΣ fi  
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, to the longitudinal axis of the bar 
 
 
4.14  
transverse-rib flank inclination α  PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
angle between the flank of a transverse rib and the core surface of a bar measured perpendicular to the 
longitudinal axis of the transverse rib 
 
NOTE 1  See Figure 2. 
 
 
4.15  
transverse-rib inclination β  
angle between the rib and the longitudinal axis of the bar 
 
NOTE 1  See Figures 1, 3 and 4. 
 
 
 
5 Dimensions, mass per unit length and permissible deviations 
 
Dimensions, mass per unit length and permissible deviations are given in Table 2. However, manufacturer and 
purchaser  may agree on  special ordered diameter upon  notification to the regulator. 
 
Table 2 — Dimensions, mass per unit length and permissible deviations  
 Nominal bar   Nominal cross - Mass per unit length  
 diameter a  sectional area b   
 d  An Requirement c Permissible deviation d 
 mm  mm2 kg/m  % 
 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  than  50 mm  should  be  agreed  between  the  manufacturer  and  purchaser.  The  
permissible  deviation on such bars shall be ± 4 % .   
b An= 0,785 4×  d2    
c Mass per unit length = 7,85 × 10−3 × A.   
   n   
d Permissible deviation refers to a single bar.    
      
 
 
. 
 
NOTE  Common delivery lengths of straight bars are 6 m, 9 m, 12 m and 18 m. 
 
            , the permissible deviation on delivery lengths from rolling mill shall be 1000mm . 
 
 
6 Requirements for ribs 
 
Ribbed bars shall have transverse ribs. Longitudinal ribs may be present or not. 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
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 in Table 3. 
 
Table 3 — Requirements for ribs  
 Nominal diameter  Ribs of uniform  Crescent -shaped ribs  
 d height   
 mm   
    
Rib height, a 
All 0,05 d 0,065 d Minimum     
    
Rib spacing, c 6 u d< 10 0,5d u c u 0,7 d 0,5d u c u 1,0 d 
Range  d W10 0,5d u c u 0,7 d 0,5d u c u 0,8 d 
Transverse -rib inclination, β All 35° u β u 90°  35° u β u 75°  
Transverse -rib flank inclination, α All α W45°  α W45°  
Ribless perimeter, Σ fi All  0,25 dπ 
Maximum     
 
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 0,15 d. 
 
 
 
 
 
 
 
 
 
 
 
 
Key  
1 longitudinal rib  
2 transverse rib 
 
Figure 1 — Ribbed bar — Definitions of geometry 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Key  
1 rib  
2 rounded transition 
 
Figure 2 — Rib flank inclination, α, and rib height, a — Section A-A from Figure 1 
 
 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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°) 
 
 
7 Chemical composition 
 
The chemical composition of the steel, as determined by cast analysis, shall conform to Table 
4. The carbon equivalent, CEV, is calculated according to the following formula. 
 
CEV  C Mn (Cr  V  Mo) (Cu  Ni) (1) 
 
5 15 6    
 
where C, Mn, Cr, V, Mo, Cu and Ni are the 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 based on cast analysis — Maximum values of mass 
fractions, in percentage  
Steel 
grade  C a Si Mn P S N b CEV a, 
c 
B300A -R        
B300B -R        
B300C -R        
B400A -R        
B400B -R — — — 0,060  0,060  — — 
B400C -R        PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
B500A -R        
B500B -R        
B500C -R        
B400AWR d        
B400BWR         
B400CWR  0,22 0,60 1,60 0,050  0,050  0,012  0,50 
B500AWR  
B500BWR         
B500CWR         
        
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 
B400DWR  0,29 0,55 1,80 0,040  0,040  0,012  0,56 
B420DWR d 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 
B550DWR  0.25   0.035  0.040    
B600 0DWR  0.30   0.035  0.040    
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.  
 
 
Table 5 — Chemical composition based on product analysis — Permissible 
deviation of the product analysis in percentage by mass  
Elements  Specified maximum value in  Permissible deviation in product  
 cast analysis in Table 4  analysis from the specified limits of  
  the cast analysis in Table 4  
 % % 
   
C u 0,25   0,02 
 0,25  0,03  
   
Si u 0,60   0,05 
   
Mn u 1,65   0,06 
  
 1,65  0,08  
   
P u 0,05   0,008  
  
 0,05  0,010   
   
S u 0,05   0,008  
  
 0,05  0,010   
   
N u 0,012   0,002  
   
 
 
8 Mechanical properties 
 
8.1 Tensile properties 
 
The tensile test shall be 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 East Africa Draft Standard, 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 below this upper limit, respectively. 
This definition refers to the long-term quality level of production. 
 
Table 6 — Tensile properties  PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 Steel grade  Specified characteristic value  Ductility properties  
Spec
ified 
characteri
stic 
value of  Specified characteristic  of upper yield strength  
   
Ductility  
class   R
eH value of elongation a  
  N/mm2 
Rm/R
eH   % 
         
  Minimu
m  Maximum  Mini
mu
m  A
5  A
gt 
       Minimum   Minimum  
 B300A -R 300  —   16   
          
A B400A -R 400  — 1.02    2 
B400AWR      
    14  
        
B500A -R 500  —     
      
B500AWR        
        
 300B -R 300  —   16   
B B400B -R 400  — 1.08    5 
B400BWR      
    14  
 B500B -R 500  —     
       
 B500BWR        
         
 B300C -R 300  —   16   
C B400C -R 400  — 1.15    7 
B400CWR      
    14  
 B500C -R 500  —     
       
 B500CWR        
         
          
 B300D -R 300  —      
         
 B300DWR      
17 b   
        
         
D B350DWR  350   1.25   8 
     
   
1.3 × ReH(min.)    
B400DWR  400     
       
 B420DWR  420     16 b   
 B500DWR  500     13 b   
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 ductilit y 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 betwe en 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, the bars 
shall show neither rupture nor cracks visible to a person of normal or corrected vision. 
 
8.3 Rebending properties after ageing 
 
Regarding fifteen steel 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 rebend test is used to verify 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 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
If required by the purchaser, the manufacturer shall demonstrate 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) 2 σa 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 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 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 the diameter specified in 
Table 7. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table 7 — Mandrel diameter to be used for the bend test 
 
 Dimensions in millimetres  
  
Nominal diameter  Mandrel diameter  
d (max.) a, b 
u 16 3d 
16 d u 32 6d 
32 d u 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 may be used. 
 
 
9.3 Rebend test 
 
The rebend 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. 
 PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
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  Mandrel diameter  
 d (max.) a, b 
 u 16 5d 
 16 d u 25 8d 
 25 d u 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 composition 
 
In general, the chemical composition is determined by spectrometric methods. 
 
10 Designation 
 
Ribbed bars according to this part of East Africa Draft Standard shall be designated in the following order: 
 
a) reinforcing steel; denoted (B) 
 
b) a reference to this part of East Africa Draft Standard (e.i DEAS 412-2:2018:2018 ); 
 
c) the nominal diameter, in millimetres, according to Table 2; 
 
d) the steel grade. 
 
EXAMPLE Reinforcing steel DEAS 412-2 – 12 B500CWR 
 
11 Marking 
 
11 Marking 
 
Each bar and each bundle shall be legibly and indelibly marked as follows; 
 
Each  bar shall be marked shall be marked with manufacturers name or logo, steel grade and nominal diameter 
 
Each bundle shall be marked with manufacturers name or logo, steel grade, nominal diameter and batch / cast number  
Special orders bars in addition to the above marking shall bear the marking SP  
 
11 
 
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 testing of a specific delivery. 
 
12.2 Certification scheme PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 
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 deliveries of reinforcing steel 
not subject to a certification scheme are given in 12.3.2 and 12.3.3. 
 
Acceptance testing of a specific delivery shall be performed according to 12.3.2. 
 
By agreement between the manufacturer and purchaser, 12.3.3 may be used. 
 
 
 
12.3.2 Evaluation 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 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 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. 
 
Test pieces shall be taken from each test unit as follows: 
 
a) two test pieces from various bars for testing the chemical composition (product analysis); 
 
b) a minimum of 15 test pieces (if appropriate, 60 test pieces, see 12.3.2.3.1) from various bars for testing all 
other properties specified in this part of East Africa Draft Standard(DEAS 412-2.) 
 
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:   
m15−2,33×  s15Wfk (2) 
wher
e      
f
k   is the required characteristic value;   
2,3
3  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).   
s =  x i− m152 (3) PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
1
5   14  
    
If the condition stated above is not fulfilled, the index   
k 
′ 
=  m
15 −f
k  (4) 
  
   s
15  
is determined from the test results available. Where k ′W 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:  
m 60−1,93×  s 60>fk (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). 
 
 
 
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 part of East Africa Draft Standard5. In this case, the test unit 
shall be considered to comply with the requirements. 
 
The tests may be continued when at most 2 results not conforming to the conditions occur. In this case, 45 
additional 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 requirements in this part of East Africa Draft Standard. 
 
12.3.3 Evaluation 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/rebend 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/rebending 
properties in 8.2 and 8.3. 
 
c) One cast analysis shall be carried out for every cast to verify chemical 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 
part of East Africa Draft Standard are fulfilled. 
 
12.3.4 Test report 
 
The test report shall contain the following information: 
 
designation of the reinforcing steel in accordance with this part of East Africa Draft Standard  PUBLIC REVIEW DRAFT 
 
                                                         DEAS 412-2  
 
a) marking on the reinforcing steel; 
 
b) date of testing; 
 
c) mass of the test unit; 
 
d) test results. PUBLIC REVIEW DRAFT  
© EAC 2016  First Edition 2016