Where the
world gathers for metal finishing
Q&As since 1989


-----

Suggested thickness of hot dip galvanizing

I have a 4 cm x 5 mm black steel strip 6 m long. I want to hot dip galvanize it. What should be the minimum thickness (micron) of Zn to be applied.

ZAHID NIAZI
Engineer - Jeddah, saudi Arabia
January 28, 2008

---

First of three simultaneous responses -- February 1, 2008

The minimum thickness is specified in ISO 1461.
For 6mm you'll want to see 85u average and not less than 70 anywhere.

But don't assume that the galvanizer has good control on the thickness. He can't just dial up a thickness.

Its influenced by steel chemistry, flux strength, type, zinc temperature, immersion time, alloys in the zinc, drainage time (if hollow) etc

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK

---

Second of three simultaneous responses --

It should be minimum 70 micron and 505 gram/m2

Hakan Esen, Material Engineer(BSc.)
galvanizing plant manager - Bursa, Turkey
February 2, 2008

---

Third of three simultaneous responses --

Low end industry standard for galvanizing thickness is G60 or .60 oz per sq Ft.

Mark Postema
- Rancho Cucamonga, California
February 3, 2008

---

Dear Geoff Crowley,

What should be the minimum thickness of Zinc for a Galvanized pipe (Inside and out side the pipe), also let me know its area to weight ratio in general?

Qaiser Majid
Lahore, Pakistan
February 22, 2008

---

You didn't state the wall thickness of the pipe.

There might be a special standard for pipes, I'm not sure. But if you apply ISO 1461, then for wall thickness of 6 mm or more, you want 85 you on both sides of the wall.

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK

February 25, 2008