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Title: Pre galvanised or plain mild steel for resto Post by: Duncan23 on May 04, 2011, 06:49:58 PM I spoke to the steel stockist today about getting some sheet to make into my new floorpan (and offcuts to practise welding on). They asked whether I wanted pre-galv or CR4. What do you guys think I should use?
Pro galv: increased protection when actually in the car less rust while sat in the garage No need to treat as soon as it's installed Con: slightly more expensive care/cleaning needed when welding? difficulty getting paint to stick I don't thing it should be any harder to cut/shape than CR4. Maybe there would be fewer offcuts, but that doesn't really matter... Have I missed anything? What's the consensus here? Cheers Duncan Title: Re: Pre galvanised or plain mild steel for resto Post by: millieman on May 04, 2011, 11:35:49 PM Being in the metalwork game and having restored a few i would use zintec which is fully weldable, leaving good protection after welding. Cold reduced is prime quality but after welding the oil is burnt off allowing surface rust within hours.
Title: Re: Pre galvanised or plain mild steel for resto Post by: MattNoVAT on May 05, 2011, 01:13:55 AM I would ALWAYS go for the best material I can afford.
If it's rusted once it means that area is prone/susceptible. So even if it's a little more expensive to buy it protects your initial investment and the overall car. Ask yourself this: Do you possibly want to re-visit the same area for a later repair because materials used in first repair are more prone to rusting? Title: Re: Pre galvanised or plain mild steel for resto Post by: Duncan23 on May 05, 2011, 06:42:48 PM I did some research and discovered zintec is significantly more convenient for welding and painting than pre-galv (you don't have to gind the coating off to weld it!). Unfortunately, the supplier didn't have zintec, but they can order it for me. So I got some CR4 off-cuts to practise welding/shaping with and I'll measure up and order zintec in the right sizes when I'm happy with my technique.
Thanks for the useful info. :) Cheeers Duncan Title: Re: Pre galvanised or plain mild steel for resto Post by: rodney3010 on May 06, 2011, 01:59:23 PM Duncan
What thickness are you using for your floorpans? Rodders Title: Re: Pre galvanised or plain mild steel for resto Post by: Duncan23 on May 06, 2011, 06:52:07 PM I'm gonna try 1.6mm - if it's impossible to work and I want to put the grooves in I might go down to 1.2. Not decided how important the grooves are yet...
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