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Zzz zed 12-02-2020 04:03 AM

Zink steel
 
I have two questions regarding sink coated steel
First does the hot zinc coating on steel interfere with the jaws on a shrinker stretcher machine
Second is it recommended to use zinc steel for auto restoration?

Thanx
Mick

dwmh 12-02-2020 02:02 PM

To answer your second question, you have to clean the zinc off to weld it, and the fumes are poisonous. Personally I would not use it.

Zzz zed 12-02-2020 03:39 PM

I have been using it for the last 10 years. I only just started to think maybe I shouldn’t.

Overkill 12-02-2020 06:53 PM

Zinc
 
Zinc will plug up your shrinker jaws, and is slippery and will cause them to slip as well.

crystallographic 12-04-2020 12:20 AM

By welding or brazing zinc sheets, the temperature can rise enough to vaporize the zinc and if you breathe it , can give you "zinc chills."
Welding galvanized steel can also give you zinc chills if you do not wear proper protective gear.


Soldering, riveting and bolting zinc clad sheets recommended.

Ryan in Melbourne 12-04-2020 02:10 AM

i have been looking at the steel sheets as well Mick.


the GT40 i want to build calls for the use of EN2B sheets, which is an old english standard.



comprising carbon 0.15 max
Manganise 0.50m
Sulfur 0.05
Phosphorus 0.05


i am not sure what sort of sheets you can get in South Australia, but i havent found any EN2B in Melbourne.


i have been going through the bluescope steel site.

http://steelproducts.bluescopesteel....ary/datasheets


I haven't got much past that at the moment. Since this will be forming the monocoque chassis, i am considering the cold rolled CM350-G, which as a 350MPA strength. My only concern is if i will be able to form it easily.


Ryan

Ryan in Melbourne 12-04-2020 02:26 AM

As a beginner, maybe someone else here could suggest a steel that would be easy to form and why.


i have been trying to understand the importance of the different alloys compositions
https://www.google.com/url?sa=t&rct=...htaPYBaotLjYY0


sounds like Carbon and Manganese in higher % make for a better steel,

Sulfur in a high % is worse
Phosphorus may provide some extra corrosion protection but in general is undesirable.

metaldahlberg88 12-04-2020 07:59 AM

I've seen aluminum killed steel used or cited by many in the metalshaping community as easily formable. I've used it in a seminar I took last year. AKDQ - aluminum killed drawing quality. I believe the astm code is ASTM A 1008 DS, type B. It's tough to find at most metal suppliers. Or if they even have it available they require you to order a whole pallet. Here's an article on it https://www.sciencedirect.com/topics...m-killed-steel

What I've ended up finding local to me and buying is ASTM A 1008 type A or type B which I guess is what people usually refer to just as cold rolled steel.

cliffrod 12-04-2020 09:22 AM

I'm curious about manganese content. Does its physical properties change when alloyed in certain combinations, can it can be annealed., ??

I understood manganese quickly work-hardens under impact conditions to become very strong and resilient. certain stone-related equipment applications employ this behavior. Large pestles and cones in crushing equipment are often plated with manganese to extend machine life.

For structural bends, this might provide a strength benefit. But such properties would seem to be undesireable in a complex metalshaping application.

Ryan in Melbourne 12-07-2020 12:56 AM

The Manganese quantity also intrigues me as well.
the En2b is still a low carbon content steel alloy, so exhibits most of the qualities of a "Mild Steel" at a guess.

will have to dive into the materials books.



Ryan


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