1 
 ने.गु. १४१:२०७५  
दोस्रो ऩुनरयक्ष्ण 
                                                                          NS:141:2075  
 
 
 
 
नेऩार गुणस्तय 
Nepal Standard  
 
GALVANIZED STEEL SHEETS  
(PLAIN AND CORRUGATED) - SPECIFICATION  
(Second Revision  2075 ) 
 
 
 
नेऩार  सयकाय  
उधोग ,फाणणज्म  तथा आऩूर्ति भन्त्ररम  
नेऩार  गुणस्तय तथा नाऩतौर  बफबाग  
फाराजु ,काठभाडौँ  
2 
 g]kfn u'0f:t/ kl/ifb \ 
Nepal Council for Standardization (NCS)  
 
 
अध्यऺ  
भानर्नम भाबरका मादफ , उधोग फाणणज्म तथा आऩूर्ति भन्त्री  
उपाध्यऺ  
  श्री माभ कुभायी खर्तवडा, सचिव, उद्मोग , फाणणज्म तथा आऩूर्ति भन्त्रारम 
सदस्यहरु  
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२.  श्री  .....................                 सह-सचिव           उद्मोग , फाणणज्म तथा आऩूर्ति भन्त्रारम 
३.  श्री सुयेन्त्र प्रसाद सुवेदी         सह-सचिव            शिऺा, ववऻान तथा प्रववचध भन्त्रारम  
४.  श्री संजीव कुभाय कणि            सह-सचिव     कृवि ववकास भन्त्रारम (खाध प्रववचध तथा गुण र्नमन्त्रण वव. ) 
५.  श्री र्नभिरा अचधकायी बट्टयाई      सह-सचिव             कानुन तथा संसदीम भाशभरा भन्त्रारम  
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७. श्री सुभनरार श्रेष्ठ                सह-प्राध्माऩक       बरबुवन ववश्वववधारम   
८.  श्री प्रा.डा. ददऩक प्रसाद सुवेदी        प्राध्माऩक                काठभांडौ ववश्वववधारम      
९.  श्री ददनेि  श्रेष्ठ                                     नेऩार उधोग वाणणज्म भहा संघ        
१०. श्री ददऩक श्रेष्ठ                                       नेऩार िेम्वय अप कभसि  
११. श्री अर्नता जोिी                                          उऩबोक्ता सयोकायवारा संघ संस्था  
१२. श्री शसजिना फुरािकोटी                                       उऩबोक्ता सयोकायवारा संघ संस्था  
१३. श्री अरुणदेव बट्टयाई                                                 ववऻ 
 
 
 
 
सदस्म सचिव  
श्री ववश्ववाफु ऩुडासैनी, भहार्नदेिक,ने.गु.तथा ना.तौ.वव. 3 
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१५=श्री अब्दुर यउप,याजेि भटेर क्राफ्टस् 
१६. श्री बफफेक शसग्देर ,सहयी ववकास तथा बफन र्नभािण  बफबाग      
 
 
 
 
 
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 5 
 1. SCOPE  
This standard prescribes  the requirements  of plain galvanized steel sheets and strips ( coils) and 
corrugated  galvanized steel sheets.  
 
2. REFERENCES  
The following standards contain provisi ons which through  reference in this text, constitute 
provisions of this standard. At the tim e of publication, the editions indicated were valid . All 
standards are subject to revision and parti es to agreements based on this standard  are encouraged 
to investigate the possibility of applying the most re cent editions of the standards indicated 
below:  
NS No.   Title  
NS 234   Cold -rolled low carbon steel sheets and strips  
NS 295   Hot-rolled carbon steel sheet and strip  
NS 414                        Glossary of terms relating to iron and stee l: Part 3  Steel sheet and strip  
NS 551 Recommended practice for hot di p galvanizing on iron and steel    
NS 213                        Method for determination of mass of zinc coating on z inc coated iron and                                             
                                    steel articles  
ISO 404:2013   General t echnical delivery requirements for steel and steel products  
 
3. TERMINOLOGY  
3.1 For the purpose of this standard, the definition given in  NS 414 and the following shall apply.  
3.2 Black Sheet - Hot rolled steel sheet prior to pickling operation  
3.3 Cold Rolled Sheet or Coil - Cold -rolled sheet or coil prior to continuous galvanizing process.  
3.4 Thickness of Sheet  - Thickness of hot -rolled or cold-rolled  sheet in cut length or coil form.  
4. SUPPLY OF MATERIAL  
The general requirem ents relating to the supply of galvanized  sheets and st rips shall conform to 
ISO 404:2013 .  6 
 5. MANUFACTURES   
5.1 The base metal of pla in galvanized sheets and coils shall conform to NS 295 or NS 234  as the 
case may be.  
5.1.1  When it is not p ossible to test the base metal before  galvanizing, the base metal may be 
tested after stripping off the zinc coat ing.  
5.1.2  For corrugated sheets, the maximum phosphorus content may be 0.09 percent.  
5.2 Galvanizing shall be  carried out by first pickling the black sheets or by cle aning the c old-
rolled coils in the line and then dipping them in a bath of molten zinc at a temperature suit able to 
produce a complete and uniformly adhesive z inc coating. The zinc used for galva nizing shall 
conform to Table 1.  
Table 1 Zinc  for Galvanizing  
S.N. Constituent  Grade Zn 98.5 0 (%) 
1 Zinc , Min  98.50 
2 Lead, Max  1.25 
3 Cadmium, Max  0.02 
4 Iron, Max  0.02 
5 Tin, Max  0.02 
6 Copper, Max  0.02 
NOTE:  Other  impurities do not preclude the possible presence of other unwanted 
element s. However, analysis shall regularly be made only for impurities listed in the 
table. The zinc shall be determined by difference between the sum of total elements 
analyzed and 100 percent. By agreement between the manufacturer and the purchaser, 
analysts m ay be required and limits established for elements not specified.  
5.3 Passivation sha ll be carried out on the surface.  
 
6.  CLASSIFICATION  
Base metal of galvanized plain coils an d sheets ( spangled and zero s pangled) as well as 
corrugated sheets  are classified as per Table 2.  
Table 2  Classification of  Grades of GP/GC  Coils and Sheets  
S.N. 
 Type  
 Designation  
 Grade Reference of Base Metal  
NS 295/NS234 
i Deep Drawing  GPD  Grade DD  
ii Extra Deep Drawing  GPED  Grade EDD  
iii Interstitial Free  GPIF Grade IF  7 
 iv Corrugated Ordinary  GC Grade O  
V Ordinary  GP Grade O  
Vi Ordinary –Hard  GPH  Grade O  
vii Lock Forming  GPL  Grade D  
 
NOTE :-  
1. Spangles shall not be allowed to form on the surface of zero spangled strips /sheets 
during galvanizing.  
2. If grade designation GP is required by the purchaser, it may be manufactured from 
Grade O of NS 234 
7. ZINC COATING  
Unless otherwise agree d to between the purchaser and the manufacturer, the zin c coating shall 
conform to the requirement  of any o ne of the grades prescribed in Table 4 .  
7. 1 The zinc coating sha ll conform to the requirement of  any of the grades pres cribed in Table 4 . 
The mass of coating referred to in thi s standard shall represent the total mass of zinc, both sides 
inclusive.  
7.2 Any other mass of co ating, than those specified in Table  4, may be supp lied, if agreed to 
between the purchaser and the manufacturer.  
7.3 The following are recommended grades of zinc coating for the various thicknesses  of sheets;  
Table 3  grades of zinc c oating for the various thicknesses of sheets  
S.N. 
 Thickness  
(mm)  Grade of Zinc Coating  
(g/m2) 
I 0.18 to 0.28 (both inclusive)  200 
Ii 0.30 to 0.5 5 (both inclusive)  220 
iii 0.60 to 1.0 (both inclusive)  275 
Iv Above 1.0  350 
 
 
NOTE: -  
1. The minimum thickness for roofing application is 0.40 mm and corresponding grade of 
coating shall be 220 g/m2. 
2. If agreed to between the manu facturer and the purchaser for thickness  0.18 mm to 0.28 
mm ( both inclusive), other coating grades  180 and 120 may be used.  8 
 7.4 In addition,  X-ray fl uorescence method (on line/ off line ) can also be used for determining the 
zinc coating .  
Table 4 Mass of Coating (Total Both Sides)  
S.N. 
 Grade of Coating  
 Minimum Average Coating  
Triple Spot Test g/m2 
 Minimum Coating  
Single Spot Test *  
g/m2 
i 600 600 510 
ii 450 450 380 
iii 350 350 300 
iv 275 275 235 
v 220 220 190 
vi 200 200 170 
vii 180 180 155 
viii 120 120 100 
*Minimum individual value obtained in triple spot test  
7.5 If agreed to between the purchaser and the manufacturer, the grade of coatings  100 and 80 
may be used for non -critical applications other than roofing. The mass of coating in such cases 
shall be as follows:  
Table 5  The mass of coating for non -critical app lications  
Grade of 
Coating  Minimum Average Coating Triple Spot 
Test (g/m2) Minimum coating Single Spot test 
(g/m2) 
100 100 90 
80 80 75 
 
Note: - For the above grade of coating, the mandrel diameter for bend test for adhesion 
of zinc coating shall be subject to mutual agreement between the purchaser and the 
manufacturer.  
 
 
 
8 BEND TEST  
8.1 Test Samples   
Bend test for the purpose of conformity shall be carried out at the rate of one se t of 2 samples for 
every 1000 plain  sheets or part thereof. However, be nd test shall not be carried out on sheets  
intended for corrugation  9 
 8.1.1  One bend test sha ll be conducted for every coil  
8.1.2  For bend test, the test piece shall be 230 mm long and 75 mm to 100 mm wide cut across 
the direc tion of rolling.  
8.1.3 Specimens for bend t ests shall be free from burrs. Filling or machining  to remove burrs is 
permitted. Cracks of the base metal  developi ng at the edge of the specimen or coarse grain  
developing at the line of the bend shall b e disregarded.  
8.2 Requirements  
Samples of galvanized stee l sheets selected as described in 8.1 shall withstand  bending through 
1800 around a mandrel having diameter  specified in Table 5  without peeling or f laking  of zinc 
coating. Crack or fracture o f base metal, except those ind icated in 8. 1.3 shall not be permitted.  
Table 6  Mandrel Diameters for Bend Test (All dimensions in millimetres. ) 
S.N. 
 Grading  
of 
Coating  
 Diameter * of Mandrel For Thickness of Sheet     
Over 
3 
 
 Over 
2.3 
to 3  
 Over 
1.6 
to 
2.3 Over 
1.25 
to 
1.6  
 Over 
1.0 
to 
1.25  
 Over 
0.8 
to 
1.0  
 Over 
0.5 
to 
0.8  
 Over 
0.4 
to 
0.5  
 Over 
0.3 
to 
0.4 
 Over 
0.22 
to 
0.3  
 Over 
0.16 
to 
0.22 
i 600 4 6 8 8 9 10 11 12 - - - 
ii 450 3 4 6 6 7 8 8 8 9 10 11 
iii 350 3 4 4 4 5 6 6 7 8 8 8 
iv 275 3 4 4 4 5 6 6 6 7 7 8 
v 220 2 3 3 3 4 4 4 4 5 5 5 
vi 200 2 2 2 3 3 3 3 3 4 4 4 
vii 180 2 2 2 3 3 3 3 3 3 4 4 
viii 120 2 2 2 3 3 3 3 3 3 4 4 
*Expressed as number of t imes the thickness of sheet   
  10 
 9 COATING TEST  
9.1 Test Samples  
One set of thre e samples each 50 mm2or 50 mm diameter, shall be sel ected at random from one 
sheet for every 1 000 galvanized sheets or part t hereof. In the case of the galvani zed sheets 
produced from black sheets, one set of three samples  shall be taken, two from each extremities of 
a dia gonal an d one from the middle of the sheet. Whereas i n the case of galvanized sheet 
produced from cold -rolled coils, one set of three samples shall be taken f rom the middle of the 
width of the sheet and one fr om each side of the sheet. The sample from extremities , diagonal or 
from the side of the sheet shall not be c loser than 75 mm from the edge of the sheet.  
9.1.1  In case of galvanize d sheet supplied in coils, one set of 3 samples, each 50 mm2 or 50 mm 
diameter shall be selected from one end of each coil across the width.  
9.2 Determination of Mass of Zinc Coating  
The average masses of zinc co ating of samples as selected under 9.1 and determined by the 
method given in NS 213 or by any oth er established instrumental or chemical method sha ll 
conform to both the values specified in Table 4 .  
10 RETESTS  
10.1 If any test sample fails to mee t test requirements given in 8. 2 and 9.2, two more set of test 
samples shall be taken for the specific t est requirements from the same lot.  
10.2 If any of the r etest samples  fails to meet the  requirements of this sta ndard, the entire batch 
of the sheets represented by  the sample shall be deemed as not conforming to the standard.  
11 FREEDOM FROM DEFECTS  
11.1 Galvanized plain  sheets, corrugated sheets and coils shall be reasonably flat and free from 
bare spots, holes, te ars and other harmful defects.  
11.2 Coils, howe ver, may contain some abnormal imperfections whic h render a portion of the 
coil unusable since the imper fections in the coil cannot be removed as in the case with cut length.  
12 MASS  
12.1 Mass of sheets and coils shall be given in kg, of actual or calculated mass.  
12.2 The mass of sheets  and coils shall be calculated as given in Table 7  on the basis of nominal  
dimensions and mass of zinc coat ing. 
  11 
 Table 7  Calculation of Mass of Sheets or Coils  
S.N. 
 Type of 
Material  
 Order of 
Calculation  
 Method of Calculation  
 Number of Numerals 
in Resultant value   
i Sheet  Mass of Single 
Sheet  Nominal mass of single sheet 
plus mass of zinc coating  Rounded off to 4 
effective figures  
Total Mass  Mass of single sheet(kg) x 
Number of Sheets  Rounded off to integral 
value of kg  
ii Coil  Unit mass of 
coil  Unit mas s of sheet (kg/m2) X 
Width (mm) x 10-3 Rounded off to 3 
effective figures  
Mass of Single 
coil  Unit mass of coil(kg/m) x 
length (m)  - 
Total mass(kg)  Total mass of each coil  Integral number of kg  
 
NOTES :  
1 Nominal mass of single sheet shall be calculated by calculating the volume of the sheet 
and multiplying the same with density of sheet (density 7.85 g/cm3) and rounding the 
same to 4 effective figures.  
2 Mass of the coating shall be calculated by multiply ing the surface area of the single 
sheet with indicated nominal coating mass (g/m2) as shown f or triple spot test ( see Table 
4),  
3 For calculation of corrugated sheet mass, the width before corrugation consider ed 
while calculating the area .  
 
13 DIMENSIONS AND TOLERANCES OF PLAIN SHEETS/COILS  
13.1 Sizes of Plain Sheets  
The plain sheets shall be supplied in any combination of the following le ngths, widths and 
thicknesses:  
a) Length: -1829, 2134 , 2438 , 2743, 3048 and 3658 mm  
b) Width :- 762, 914 , 1000 and 1 220 mm  
c) Thickness (uncoated sheets) :- 0.18, 0.22, 0.25, 0. 28, 0. 32, 0.40, 0.45, 0.50, 0.55, 0.60 , 0.70,  
0.80, 0.90, 1.00, and 1.60 mm  
NOTE : Sheets for other sizes  (length, width and thickness) may also be supplied subject t o the 
mutual agreement between the p urchaser and the manufacturer.  12 
 13.1.1  Unless otherwis e agreed, the internal nominal diameter of sheet supplie d in coil shall be 
450, 510 or 610 mm.  
13.2 Tolerances  
13.2.1  Length  
No sheet shall be smaller in length th an that specified. Tolerances on length on plus side shall be 
15 mm or 0.5 percent of length whichever is greater.  
13.2.2  The diag onal distance between opposite corners of any sheet  shall not differ by more than 
20 mm.  
13.2.3  Width  
No plain sheet shall  be smaller in width than that specified. The positiv e tolerances on width 
shall be 10 mm.  
13.2.4  Thickness  
The tolerance on thickn ess of sheet and coil shall be according to NS 295 or NS 234 as 
applicab le.  
13.2.5  Tolerance on Mass  
The tolerance on mas s of individual sheets calculated in accordance with 12.2 shall be within.  
±10 percent and tolerance on mass of  each bundle of sheet shall be ±  5 percent.  
14 DIMENSIONS AND TOLERANCES OF CORRUGATED SHEETS  
14.1 Sizes of Corrugated Sheets  
14.1.1 Length  
The length of the corrugated sheets shall be as follows:  
1829 , 2134 , 2438 , 2743, 3048  and 3658 mm  
NOTE : Sheets of  other lengths  may also b e supplied subject to the mutual agreement  between the 
purchaser and the manufacturer .  
14.1.2  Number of Corrugations                             
The n umber of corrugat ions shall be as per table given below,  depending on the width of the 
sheet. The overall wid th of the corrugated sheet s before and after corrugation shall be as shown 
in Table 9 .  13 
  
Table 9  Overall Widths and Corrugations of Sheets  
 
S.N. 
 Number of Corrugation  
 Grade  
 Overall width of Sheet  
Before Corrugation  
mm 
 After Corrugation  
mm 
i 8 A 762 665 
ii 10 A 914 810 
iii 11 A 1000  910 
iv 13 A 1200 1110  
v 14 A 1220  1125  
vi 16 A 1350  1220  
vii 18 A 1500  1370  
viii 20 A 1650  1520  
ix 8 B 750 680 
x 10 B 914 830 
xi 11 B 1000  930 
xii 13 B 1220 1130  
xiii 16 B 1350  1240  
xiv 18 B 1500  1390  
xv 20 B 1650  1540  
xvi 10 C 840 720 
xvii 12 D 1000  875 
 
 
14.1.2 .1 Sheets  of sizes ot her than those specified above may be supplied, if agr eed to between 
the contracting parties.  
14.1.3 Depth and Pitch of the Corrugations  
The depth and pitch of c orrugation shall be as follows (see Fig. 1):  
 14 
  
 
Table 8  Depth and Pitch of the Corrugations  
 
 
 
 
14.2 Tolerances  
14.2.1  The tolerances on dimensions of corrugated sheet shall be as given in Table 10 .  
Table 10 Tolerance on Dimension of Corrugated Sheets  
S.N. 
 Dimension  Tolerance*  
i Depth of Corrugation  ± 2.5 mm  
ii Pitch of Corrugation  ± 5 mm  
iii Overall width after corrugation  ± 25 mm  
*Average of four measurement  
15 MARKING  
15.1 Manufacturer' s name or trade -mark, grade of coating, length, width, thic kness and number 
of corrugations,  grade in  case of corrugated sheets and material identification (grad e, quality, 
etc.), purpose of use (if roofing)  shall legibly be marked on top o f each sheet or  shown on a tag 
attached to each bundle.   
15.1.1  The material may also be marked wi th the Standard Mark.  
 
 
PITCHDEPTHGrade   Depth of Corrugation (mm) Pitch of Corrugation (mm)   
A 17.5  75 
B 12.5  75 
C 19.0 70 
D 17.5 70 