Code of Practice for Process Design Testing and Application of Hot Dip Galvanizing of Iron and Steel - Part 1 : Batch Process
Document Title [Hindi] :
लोहे और इस्पात के तप्त निमज्जी जस्तीकरण की प्रक्रिया, डिजाइन, परीक्षण और अनुप्रयोग के लिए रीति संहिता भाग 1: खेप प्रक्रिया
Document Type :
Revision
Language :
English
Priority :
3
ICS Code :
25.220.40
Date of Project Approval :
01-05-2024
Standards to be Revised :
Sl.No.
Is No & Year
1
IS 2629: 1985
Standards to be Superseded :
Sl.No.
Is No & Year
1
IS 2629: 1985
2
IS 6159: 1998
3
IS 4759: 1996
Classification Details
Group :
Metals, Alloys and Metal Products (including Steel Products)
Sub Group :
Steel and Steel Castings, Wires, Ropes, Pipes , Tubes and other products
Sub Sub Group :
Wires & galvanized sheets
Aspects :
Code of Practice
Risk :
None
Certification :
None
Short Commom Man's Title :
ITCHS Code :
Ministry :
Ministry of Steel
Sustainable development Goals :
Degree of Equivalence :
Indigenous
Identical/Equivalent Standards :
Organization Type:
Division Council Chairperson Approval Details
Sl.No.
Synosis Points
1
Hot-dip galvanizing is an age-old, proven, and established process of applying zinc coating to iron or steel surface for protection against corrosion. The zinc coating firstly protects the base metal by acting as a barrier between the metal and the atmosphere and secondly affords sacrificial protection through its anodic capability, even when moderately sized areas of the base metal surface are exposed.
When an oxide and dirt-free article is immersed in a galvanizing bath, the metal surface reacts with molten zinc to form a surface layer consisting of pure zinc & intermediate layers of zinc-iron alloy considered to be harder than the base steel. As the article is withdrawn from the bath, it picks up pure zinc which solidifies on cooling and forms the outer layer consisting of pure zinc. The intermediate zinc-iron alloy layers provide a strong bond between the ferrous base material along with zinc and resists corrosion and abrasion.
2
The protection afforded by the hot dip galvanized coating to the article will depend upon the method of application of the coating, the design of the article, chemical composition of the article and the specific environment to which the article is exposed to.
It is essential that the design of any article required to be galvanized should consider not only the function of the article and its method of manufacture, but also the limitations imposed by the finish. The requirement of general design affording optimal protection of zinc coating is detailed in this revised & updated specification.
The galvanizing process can be grouped together under three categories, namely (a) wet process, (b) dry process, and (c) a combination of dry and wet process by batch galvanizing.
3
A summary of design requirement, environmental factors & defects, along with the typical photographs for illustration, commonly met with in the hot-dip galvanizing practice, their causes and remedial measures are given in Annex A. In this annex, the information given in the last column aids inspectors & users in interpreting the appearance and tests of the article to help them in arriving at a correct decision for accepting or rejecting the finished material. This standard is also crucial for industries involved in construction, transportation, infrastructure, and manufacturing where iron and steel structures are exposed to environmental conditions that can attribute to corrosion. By following the guidelines provided, organizations can design, specify, and maintain the durability, performance and coating quality of iron and steel structures.
Timeline Details
S.No.
P-Draft
Completion Date
WC-Draft
Completion Date
Final-Draft
Completion Date
Project
Completion Date(Gazette)
Entered By
Entered On
1
03-06-2024
03-11-2024
18-01-2025
02-06-2025
Mr. HAWELIKAR DUSHYANT SATYAPREM
03-06-2024
No records found.
Stages
Sl.
No.
Stage
Date of Occurence
Remarks
Circulated to
Files
1
Generation of Document Number
01-05-2024
-------
2
P-Draft
03-06-2024
Covering letter generated
-------
3
P-Draft
03-06-2024
Duration : 30 Days
MTD 24,
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4
Skipped to W-Draft
10-10-2024
Stage-Changed
-------
5
WC Draft
11-10-2024
Duration : 31 Days Submitted for HOD approval
-------
6
WC Draft
16-10-2024
WC rejected by HOD Remarks: KIndly update the dates