 
  
 ICS  77.140.75  
 
Reference number  
DRS 263 -2: 2020  
© RSB 2020  
  
 RWANDA 
STANDARD  DRS  
263-2 
Second edition  
2020 -mm-dd 
 
Steel tubes for non -pressure purposes — 
Specification  
Part 2: Steel tubes for cycles  
   
DRS 263 -2: 2020  
©RSB 2020 - All rights reserved                  ii 
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB 2020  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reprodu ce this document should be addressed to : 
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw   DRS 263 -2: 2020  
iii                ©RSB 2020 - All rights reserved  
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 Grade and type  ................................ ................................ ................................ ................................ ...... 2 
4.1.1  Scaffolding tubes  ................................ ................................ ...................... Error! Bookmark not defined.  
4.2 Materi al ................................ ................................ ................................ ................................ ...................  2 
4.3 Physical properties  ................................ ................................ ................... Error! Bookmark not defined.  
4.4 Dimensions  ................................ ................................ ................................ ................................ ............  3 
4.4.1  Outside diamet er and wall thickness  ................................ ................................ ................................ .. 3 
4.4.2  Length  ................................ ................................ ................................ ................................ .....................  4 
4.5 Straightness  ................................ ................................ ................................ ................................ ...........  4 
4.6 Freedom from defects  ................................ ................................ ............... Error! Bookmark not defined.  
4.7 Cross -welds  ................................ ................................ ................................ ................................ ...........  4 
4.8 Coating  ................................ ................................ ................................ ................................ ...................  4 
4.9 Certification  ................................ ................................ ................................ Error! Bookmark not de fined.  
5 Packing and marking  ................................ ................................ ................................ ............................  4 
5.1 Packing  ................................ ................................ ................................ ................................ ...................  4 
5.2 Marking  ................................ ................................ ................................ ................................ ...................  4 
6 Sampling and compliance  ................................ ................................ ................................ ....................  5 
6.1 Samp ling ................................ ................................ ................................ ....Error! Bookmark not defined.  
6.1.1  Sample for inspection  ................................ ................................ ............... Error! Bookmark not defined.  
6.1.2  Sample for testing  ................................ ................................ ..................... Error! Bookmark not defined.  
6.2 Compliance with the specification  ................................ .......................... Error! Bookmark not defined.  
7 Inspection and methods of test  ................................ ................................ ................................ ...........  5 
7.1 Inspection  ................................ ................................ ................................ ................................ ...............  5 
7.2 Tensile tests  ................................ ................................ ................................ ................................ ...........  5 
7.3 Flattening test  ................................ ................................ ................................ ................................ ........  6 
7.4 Drift expa nsion test (grade 216(b) and 309 only)  ................................ ................................ ...............  6 
 DRS 263 -2: 2020  
©RSB 2020 - All rights reserved                  iv 
 Foreword   
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratified  by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS  263-2 was prepared by Technical Committee RSB/TC 47, Steel  aluminium and related products . 
In the preparation of this standard, reference was made to the following standard:  
1) SANS 657 -2 Steel tubes for non -pressure purposes Part 2: Steel tubes for cycle  
The assistance de rived from the above source is hereby acknowledged with thanks.  
This second  edition cancels and replaces the first  edition (RS  263-2: 2015 ), which has been technically 
revised.  
DRS  263 consists of the following parts, under the general title Steel tubes for non -pressure purposes — 
Specification :  
 Part 1: Sections for scaffolding general engineering a nd structural applications  
 Part 2: Steel tubes for cycles  
 Part 3: Steel tu bes for rolls for conveyor belt idles  
 Part 4: Steel tubes for rolls for round, oval, square and rectangular section for furniture.  
Committee membership  
The following organizations were represented on the Technical Committee on Steel aluminium and related 
products  (RSB/TC 47) in the preparation of this standard.  
University of Rwanda - College of Science and Technology (UR-CST)  
MANUMETAL  
Rwanda Transport Dev elopment Agency  (RTDA)  
HEROCEAN Ltd  DRS 263 -2: 2020  
v                ©RSB 2020 - All rights reserved  
 AFRIFOAM  
IPRC Ngoma  
Mota Engil  
Ministry of infrastructure (MININFRA)  
National quality testing laboratory (NQTLD)  
Rwanda  Standards Board  (RSB) – Secretariat  DRS 263 -2: 2020  
1                ©RSB 2020 - All rights reserved  
 Steel tubes for non -pressure purposes — Specification — Part 
2: Steel tubes for cycles  
1 Scope  
This Draft Rwanda Standard covers the requirements , sampling and test methods  for welded steel tubes used 
to manufacture cycles.  
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 ref erences, only the edition  cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
RS ISO 6892 -1, Metallic materials – Tensile testing – Part 1: Method of test at room temperature  
3 Terms and de finitions   
For the purposes of this standard , the follow ing terms and definitions apply  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— IEC Electropedia: available at http://www.electropedia.org/  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
acceptable  
acceptable  to the authority administering this standard, or to the parties concluding the purchase contract, as 
relevant   
3.2  
defective  
steel tube that fails in one or more requirements of this draft standard  
3.3  
lot  
not less than 25 and not more than 35 000 tu bes of the same type, grade, length, nominal outside diameter, 
and nominal wall thickness, made by one manufacturer, and submitted at any one time for inspection and 
testing   
©RSB 2020 - All rights reserved                  2 
 4 Requirements  
4.1 Grade and type  
Tubes shall be of one of the grades given in Table 1 a nd of the related electrically (induction/resistance) 
welded mild steel (ERW) type given in table.  
Table 1 — Grades and types  
Grade  Type of tube  
170 Welded and supplied in the heat -treated condition  
216(a)  Welded and supplied in the heat -treated condition  
216(b) Welded and supplied direct off the mill  
309 Welded and supplied direct off the mill  
371 Welded and cold drawn  
386 Welded and cold drawn  
 
4.2 Material  
Tubes shall be of such chemical composition as ensures their compliance with all the other requirements of 
the specification. The compositions set out in table 2 are given for guidance  
Table 2 — Chemical composition  
Grade  Carbon  
% Manganese  
% Sulphur  
%, max.  Phosphorus  
%, max  
170 0.10 - 0.15 0.30 - 0.50 0.06 0.06 
216(a)  0.15 - 0.20 0.30 - 0.50 0.06 0.06 
216(b) 0.10 - 0.15 0.30 - 0.50 0.06 0.06 
309 0.20 - 0.25 0.30 - 0.50 0.05 0.05 
371 0.10 - 0.15 0.30 - 0.50 0.06 0.06 
386 0.15 - 0.20 0.30 - 0.50 0.05 0.05 
 
4.3 Mechanical  properties   
4.3.1  The yield stress, tensile strength and elongation  of a tube  shall at least  meet  minimum  value given 
table 3. when tested in accordance  with 7.2.  
4.3.2  When tested in accordance with ISO 8493 and ISO 8492 , a tube shall show no signs of cracking or 
any other defect.  DRS 263 -2: 2020  
3                ©RSB 2020 - All rights reserved  
 Table 3 — Tensile properties of tubes  
Grade Yield stress  
MPa, min.  Tensile strength  
MPa, min  Elongation %, min  
170 170 309 15 
216(a)  216 309 15 
216(b) 216 386 15 
309 309 463 15 
371 371 432 12 
386 386 463 10 
 
4.4 Dimensions  
4.4.1  Outside diameter and wall thickness  
The nominal outside diameter  and wall thickness  of the tubes  and shall be one of the values given in Table 4. 
The actual outside diameter and wall thickness shall be within the appropriate range given in Table 4.  
Table 4 — Dimensions of tubes  
Outside diameter  
mm Wall thickness  
mm 
Nom.  Max.  Min. Nom.  Max.  Min. 
12.6 12.725  12.573  0.9 
1.6 Not limited  0.9 
1.6 
15.8 15.900  15.748  0.9 0.9 
22.1 22.200  22.100  1.4 
1.6 
2.0 1.4 
1.6 
2.0 
22.2 22.250  22.098  0.9 
1.2 0.9 
1.2 
22.8 22.860  22.758  1.4 1.4 
23.4 23.444  23.292  1.2 1.2 
25.3 25.425  25.273  1.0 
1.2 1.0 
1.2 
25.4 25.451  25.375  1.5 1.62 1.5 
28.5 28.600  28.448  1.2 Not limited  1.2 
31.7 31.775  31.625  0.9 0.9  
©RSB 2020 - All rights reserved                  4 
  
4.4.2  Length  
Except when tubes of "exact" length (subject, in accordance with the purchaser’s requirements, to a tolerance 
in the range −0.5 mm to +0.5 mm) are specified by the purchaser, tubes shall be supplied in random lengths, 
as agreed between the purchaser and the manufacturer.  
4.5 Straightness  
The deviation from straightness of a tube shall not exceed 1 in 600, measured at the  midpoint of the length.  
4.6 Workmanship  
4.6.1  Tubes shall have an acceptable finish and shall be free from defects that might affect their 
serviceability.  
4.6.2  Except when otherwise specified by the purchaser, tubes shall be supplied with square "mill cut" 
ends suitably deburred and, in the case of random lengths of tube, deformations that do not extend more than 
25 mm from the cut shall not be included in the sp ecified length of a tube.  
4.7 Cross -welds  
Tubes shall have no cross -welds.  
4.8 Coating  
Unless otherwise specified by the purchaser, tubes shall be supplied uncoated.  
5 Packing and marking  
5.1 Packing  
The tubes shall be packed in bundles, cartons, or on pallets, and  only tubes of the same grade, type, nominal 
outside diameter, nominal wall thickness, and (when relevant) length, shall be packed together.  
5.2 Marking  
The following information shall legibly and indelibly appear on the label / labels attached to at least one  bundle, 
carton or pallet, as relevant, per size of the tube in a consignment:  
a) manufacturer’s name or trade name or trade mark;  
b) nominal outside diameter and nominal wall thickness;  
c) grade; and  DRS 263 -2: 2020  
5                ©RSB 2020 - All rights reserved  
 d) length (not applicable to random lengths).  
6 Sampling  
Sample  of steel tube to be inspected and tested shall be taken in accor dance with the requirements of T able 5 
and Table 6. 
Table 5 — Samples for inspection  
Lot size number of tubes  Sample size 
number of tubes  Acceptance number  
25 - 90  13 1 
91 - 150  20 2 
151 - 280  32 3 
281 – 500  50 5 
501 – 1 200  80 6 
1 201 – 3 000  125 8 
3 201 – 10 000  200 10 
10 001 – 35 000  315 15 
Table 6 — Samples for testing  
Lot size number 
of tubes  Sample size number of tubes  Acceptance number  
25 – 150 5 0 
151 – 1 200  20 1 
1 201 – 3 200  32 1 
3 201 – 10 000  50 2 
10 001 – 35 000  80 4 
 
7 Inspection and test  methods  
7.1 Inspection  
Visually examine and measure each tube in the sample taken as indicated in Table 5 for compliance with the 
requirements of clause 4.4 - 4.8. 
7.2 Tensile tests  
The tensile test shall be carried out in accordance with RS ISO 6892 -1  
©RSB 2020 - All rights reserved                  6 
 For the determination of elongation use a gauge length of 5 .65 × √So (where √So = the  original cross  
sectional area).  
7.3 Flattening test 
7.3.1  From the tube under test, cut a ring of length at least 40 mm,   
7.3.2  Place it between two parallel flat surfaces (of width at least 1.5 times the length of the ring) that the 
weld is centred between and parallel to the flat surfaces.  
7.3.3  By applying a  load to one flat surface, flatten the ring until the distance between the two surfaces is 
one of the following, as relevant:  
a) grade 216(b): 5 times the wall thickness ± 0.25 mm; or   
b) all other grades: 10 times the wall thickness ± 0.25 mm.  
7.3.4  Remove th e ring and examine for compliance with the requirements of 4.3.2.  
7.4 Drift expansion test (grade 216(b) and 309 only)  
7.4.1  From the tube under test, cut a ring of length at least twice the actual external diameter of the tube.   
7.4.2  Gradually force, witho ut shock, a conical drift that has an included angle of 60° ± 1°, into the ring until 
the internal diameter at the expanded end has been increased by the relevant of the following:  
a) grade 216(b): 12.5 % ± 1 %; or  
b) grade 309: 7.5 % ± 1 %.  
7.4.3  Examine the  ring for compliance with the requirements of 4.3.2.  
 DRS 263 -2: 2020  
 
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