HDG
SECTION
THICKNESS
SR. NO (mm)
A SURFACE AREA/TONNE 25.5 1 1mm
SECTION AREA IN mm 10 2 2mm
3 3mm
B MASS/SQ.METER(gm/sq.m) 8.5 4 4mm
SECTION THICKNESS IN mm 10 5 5mm
6 6mm
C COATING MASS(gm/sq.m) 352.5 7 8mm
COATING THICKNESS(µm) 50 8 10mm
9 12mm
D COATING THICKNESS(µm) 1.4 10 15mm
COATING MASS(gm/sq.m) 10 11 20mm
12 25mm
HOT ROLLED SECTIONS & HEAVIER STEEL SECTION WILL GENERATES CONSIDERABLY THICK
STANDARD FOR HOT DIP GALVANISING IS CONSIDERED ISO 1461 AS PER SUZLON SEG-ED-1
SURFACE MINIMUM MINIMUM
AREA/TON HDG AVG. HDG
NE (SQ. COATING COATING COATING
METER/ MASS/SQ.M THICKNESS WT/ SQ.M THICKNESS
TONNE) (Kg/SQ.M) (µm) (gm/sq.m) (µm)
255 7.85 45 320 45
127 15.7 55 390 55
85 23.55 55 390 55
64 31.4 70 500 70
51 39.25 70 500 70
42 47.1 70 500 70
32 62.8 85 600 85
25 78.5 85 600 85
21 94.2 85 600 85
17 117.75 85 600 85
13 157 85 600 85
10 196.25 85 600 85
GENERATES CONSIDERABLY THICKER COATING
O 1461 AS PER SUZLON SEG-ED-113-09-00233
INTERESTING FACTS ABOUT GALVANISATION
MICROGRAPHIC PHOTO OF GALVANISING COATING
SCHEMATIC PROCESS
GALVANISED COATING PERFORMANCE IN DIFFERENT TYPE SOIL
STANDARDS
DURABILITY OF HDG
GALVANIC SERIES OF METAL
GOOD PERFORMANCE OBTAINED BETWEEN LIQUID OF PH 4 TO 12.5
GOOD PERFORMANCE OBTAINED IN FRESH WATER(ALL WATER EXCEPT SEA WATER=FRESH WATER)
TEMPERATURE RESISTANCE OF CONTUNUOUS EXPOSURE= 200 DEG. C
METAL COMPOSITION FOR HDG
z
=FRESH WATER)
Author:
LIFE SPAN 25 YR
CONSIDERED
AS PER ISO 12944
SR. NO ZINC LOS AFTER 1 YR. EXPOSURE
MASS OF HDG COATING HDG COATING
CORROSION LOSS THICKNESS THICKNESS
CATEGORY (gm/m2) REDUCTION (µm) REQUIREMENT (µm)
1 C1 <0.7 ≤0.1 2.5
2 C2 0.7-5 >0.1-0.7 17.5
3 C3 >5-15 >0.7-2.1 52.5
4 C4 >15-30 >2.1-4.2 78.75
5 C5 I >30-60 >4.2-8.4 157.5
6 C5 M >30-60 >4.2-8.4 157.5
NOTES : THIS DATA IS BASED ON LOSS OF WT OF ZINC OF HDG COATING AS PER ISO 12944 W
IN SUZLON STANDARD SEG- ED-133-09-00233 FOR HDG REFERAL STANDARD IS EN ISO 1461 FOR MINIMUM H
FINAL COATING THICKNESS IS TO BE TAKEN FROM ISO 1461 FOR MINIMUM HDG COATING THICKNESS T
Author:
LIFE SPAN 25 YR
CONSIDERED
SAFETY MARGINE
MINIMUM
THICKNESS OF HDG
(µm)
4.5
21
55.125
82.6875
165.375
165.375
G COATING AS PER ISO 12944 WHICH IS INDEPENDENT OF STEEL THICKNESS.
IS EN ISO 1461 FOR MINIMUM HDG THICKNESS FOR FABRICATING IRON & STEEL ARTICLES
UM HDG COATING THICKNESS TO AVOID EXESS HDG COST FOR EXCESS ZINC
HOT DIP GALVANISING COATING THICKNESS
ATING THICKNESS ACCORDING TO EN ISO 1461
PRECAUTIONS DURING DEVELOPING OF HDG PART
SR. NO KEY POINTS
ARE THE VENT & DRAIN HOLES ARE SUFFICIENT IN SIZE & NUMBERS AS PER STANDARD-
1 ISO 14713 PART 1 ?
2 ARE THE VENT & DRAIN HOLES ARE LOCATED PROPERLY?
ARE THE CORNER OF GUSSETS, STIFFENERS, BRACING CROPPED TO ALLOW FREE FLOW
3 OF ZINC?
4 ARE WELDS AT OVERLAPPING SURFACES SEAL WELDED?
5 DOES FABRICATOR KNOWS TO REMOVE ALL WELD FLUX?
HAVE ACCOUNTED MARKING & TRACKING OF PARTS THROUGH GALVANISING PROCESS
6 AND ON SITE?
7 HAVE PLANNED FOR TAPPING OF THREADED HOLES OR NUTS AFTER GALVANISING
WILL THE STEEL SURFACE EXHIBITS EXTREME DEVELOPMENT OF MILL SCALES WHICH
CAN NOT MOVED IN CHEMICAL CLEANING OR REQUIRED MECHANICAL CLEANING LIKE
8 BLASTING/WIREBRUSHING
9 ARE THERE SHARP BENDS IN FABRICATION?
10 ARE THERE SECTIONS WHERE WIRE ROPE/CHAIN OF LIFTING CRANE CAN BE CONNECTED
ARE THERE ANY DIFFERENT STEEL PARTS OF VARYING THICKNESS GOING TO WELD
11 BEFORE GALVANISING
12 HAVE WE USED PROPER WELD METAL LIKE ROD OF SILICONE LEVEL LESS THAN 0.25%
13 IS THE GALVANISED PART WILL FURTHER COATED?
14 DOES THE STEEL ASSEMBLY CONTAIN MOVING PARTS?
15 ARE THERE THREADED HOLES/ CLEARANCE HOLES IN PARTS?
16 WILL THE FABRICATION FEET IN THE HDG KETTLE?
17 HAVE THE STANDARD REFER LIKE ASTM A 153, ASTM A385, ASTM A 123?
18 WHAT SAMPLING METHOD WILL BE USED?
19 HAVE WE STIPULATED CERTIFICATE OF CONFORMANCE BY GALVANISER?
20 HAVE THE END USE IS COMMUNICATED TO FABRICATOR & GALVANISER?
21 ANY SPECIAL PACKING REQUIRED FOR LONG STORAGE?
22 WHAT IS EXPECTED COATING FINISH & CORROSION PROTECTION?
23 WHAT TOUCH UP METHOD REQUIRED FOR DAMAGE OR BARE SPOT (ASTM A 780)
SR. NO. STANDARD NAME DESCRIPTION
1 ASTM A 385 03 STANDARD PRACTICE FOR PROVIDING HIGH QUALITY ZINC COATINGS (HOT DIP)
2 ASTM A 153/153M-03 STANDARD SPECIFICATION FOR ZINC COATING ON IRON & STEEL HARDWARE (HOT DIP)
3 ASTM A 780-01 PRACTICE FOR REPAIR OF DAMAGED & UNCOATED AREAS OF HDG COATINGS
STANDARD SPECIFICATION FOR ZINC COATED (GALVANISED) STEEL BARS FOR CONCRETE
4 ASTM A 767/767M RENFORCEMENT
5 ASTM A 384/384M STANDARD PRACTICE FOR SAFEGUARDING AGAINST WARPAGE & DISTORTION DURING HD
STANDARD PRACTICE AGAINST SAFEGUARDING THE AGAINST EMBRITTLEMENT OF STRUCT
6 ASTM A 143/143M PRODUCTS & PROCEDUCRE FOR DETECTING EMBRITTLEMENT
STANDARD SPECIFICATION FOR ZINC (HOT DIP GALVANISED COATINGS ON IRON & STEEL P
7 ASTM A123/123M COVERS INDIVIDUAL PIECES OR ASSEMBLIES OF VARIOUS CLASSES OF MATERIALS
8 ISO 1461 HOT DIP GALVANISED COATINGS ON FABRICATED IRON & STEEL ARTICLES
GUIDELINE & RECOMMENDATION FOR THE PROTECTION AGAINST CORROSION OF IRON &
9 ISO 14713:2009 STRUCTURE
10 ISO 14713:2009 PART1 GENERAL PRINCIPLE OF DESIGN & CORROSION PROTECTION
11 ISO 14713:2009 PART2 HOT DIP GALVANIZING
12 ISO 14713:2009 PART3 SHERARDIZING
TINGS (HOT DIP)
L HARDWARE (HOT DIP)
DG COATINGS
EEL BARS FOR CONCRETE
& DISTORTION DURING HDG
MBRITTLEMENT OF STRUCTURAL STEEL
ATINGS ON IRON & STEEL PRODUCTS
ES OF MATERIALS
L ARTICLES
NST CORROSION OF IRON & STEEL IN
