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  #1  
Old 12-02-2020, 04:03 AM
Zzz zed Zzz zed is offline
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Default 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?

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Mick
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Old 12-02-2020, 02:02 PM
dwmh dwmh is offline
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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.
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Old 12-02-2020, 03:39 PM
Zzz zed Zzz zed is offline
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I have been using it for the last 10 years. I only just started to think maybe I shouldn’t.
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Old 12-02-2020, 06:53 PM
Overkill Overkill is offline
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Default Zinc

Zinc will plug up your shrinker jaws, and is slippery and will cause them to slip as well.
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Old 12-04-2020, 12:20 AM
crystallographic crystallographic is online now
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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.
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Old 12-04-2020, 02:10 AM
Ryan in Melbourne Ryan in Melbourne is offline
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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
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Old 12-04-2020, 02:26 AM
Ryan in Melbourne Ryan in Melbourne is offline
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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.
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Old 12-04-2020, 07:59 AM
metaldahlberg88 metaldahlberg88 is offline
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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.
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Old 12-04-2020, 09:22 AM
cliffrod cliffrod is offline
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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.
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  #10  
Old 12-07-2020, 12:56 AM
Ryan in Melbourne Ryan in Melbourne is offline
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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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