what steel for turbo flanges

[Mr DOHC]

i am about to get some flanges cut up on the plasma at work, the are for adapting a turbo to a standard 1J manifold, and for dumps.
what grade steel should i use, we have bis alloy 68 upto 400 and GR250

[Forcefed6]

Just uses GR250... Bisalloy makes it very hard to drill holes if you have to. What thickness you planning on having them cut out of?

[Mr DOHC]

some 10mm, some 20, all holes will be cut with plasma, but may have to be redrilled for accuracy

[Mr DOHC]

will GR250 warp with the heat

[Forcefed6]

Most steel will warp a little with heat. It is best to face the surface on a linisher or similar after it has been welded to ensure it is flat. It shouldn't warp from exhaust temp once bolted up firmly.

GR250 is just normal grade mild steel, and is most commonly used for flanges etc.

[love ke70]

anything 10 mm
and just metal gasket and exhaust sealant them

i smoothed my home made dump pipe flange with a 5" angle grinder...

[wilbo666]

Most steel will warp a little with heat. It is best to face the surface on a linisher or similar after it has been welded to ensure it is flat. It shouldn't warp from exhaust temp once bolted up firmly.

GR250 is just normal grade mild steel, and is most commonly used for flanges etc.

GR250 sounds like the go.

Re flatness after plasma cutting, I'm happy to face them off in a mill afterwards so that shouldn't be a drama!

Thanks!

Cheers
Wilbo

[Forcefed6]

Ok, so these are for you then? If so, i would tend to do them (the flange adapter anyway) out of 16mm. But that is just me...

[Mr DOHC]

its up to wilbo, whatever thickness is ok, to a degree, 10mm, 16, 20, 24, 30 etc

they will only be warped the smallest amount, if any, they are partaiully submerged in water while being cut anyway

thay wouldnt wanna warp, 1.5million dollar machine

[wilbo666]

Ok, so these are for you then? If so, i would tend to do them (the flange adapter anyway) out of 16mm. But that is just me...

Yeah I'd go thinner on the adapter but I need to push it out a few extra mm for clearance!



Cheers
Wilbo

[Forcefed6]

If they are for the flange adapter plates, i really wouldn't bother too mauch about facing them, just use copper sealant on them when you assemble them. All the stuff I have cut on a oxy/acetalene profile cutter have been fine. And you get more heat in the material using one of these. I have made up 20 and 25mm spacer plates for turbos, and made a couple t4 to t3 adaptors out of 16mm with no dramas either.