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Cutting disc material to cut medium carbon steel

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What'd be the most suitable/the best cutting disc material to efficiently cut high/medium carbon steel (preferably as thin thickness as possible for that) ?


I use disk for hand grinder in 4 1/2 and 5 inches , the ''stainless steel '' cutting disks work perfectly in carbon steel , they are available in thin thickness 1/10

For more thin fine cut you can also use '' car body repair disk '' 4 and 3 inches which are very thin ( 1 mm in Europe ) but they are not in 7/8 mm ( 22 mm ) central hole so use only on air grinder hight speed spindle

To avoid over heating of the cutting area or high tensile steel / high carbon steel , you can use compressed air to cool down or even water base coolant as in use on metallurgy sample cutting machine as Struers

Be aware as hand cutting disk are reinforced for safety purpose , NERVER use machine cutting disk on hand grinder as they can burst

A lot of brand as Norton have cutting disk in their catalog , but even some generic are not bad for the price



--- Quote from: Overspeed on January 21, 2023, 07:56:28 am ---

For more thin fine cut you can also use '' car body repair disk '' 4 and 3 inches which are very thin ( 1 mm in Europe ) but they are not in 7/8 mm ( 22 mm ) central hole so use only on air grinder hight speed spindle

--- End quote ---
1mm cutting disks for 4 or 5" angle grinders with 22mm mounting hole are also really common, easily available from any tooling brand or abrasive disk manufacturer.

OP's question sounds again like lazy schoolwork with far too little details. Answer to what material is most suitable is: Aluminium oxide

Diamond discs may wear down relatively fast with steel. So usually one would not use them on steel for more frequent use, unless absolutely needed (exceptionally hard or need super thin / stable disc form).

The normal choice is the alumina / corundum based discs - kind the simple type. It can still be worth to get a good brand, higher grade.
A possible problem with poor quality discs is that they get soft / dull at relatively low temperature due to binder / epoxy with a low glass temperature. An overheated dull disc is real pain and makes a huge difference (e.g. 1/10 the speed) - it is essentially broken and needs to be sharpend again on a hard stone or similar. So it helps to no use the discs very hard and avoid to run them really hot.
The ceramic (compared to crstal) corundum form is more expensive, but usually lasts longer, unless getting too hot.

I like the thin (1mm) disks myself. I find it quite weird that 115mm disks exist, and always buy the 125mm.
I would like to buy thin disks for the bigger 180mm grinders, but they are hard to get by for reasonable prices.

Fireballtool did a test of grinding disks, and "discovered" (quite late) that grinding disks get destroyed by vibrations instead of just wearing down. What I do find truly amazing are the prices he apparently pays for those disks. I think he pays USD4 or more for a disk. A normal price for a 125mm grinding disk here in the Netherlands is around EUR1. I've done some shopping at "ecotools", and if you buy 100 disks they cost around 60ct each.


I do not use these disks enough to know if there is a noticable difference between the "metal" and the "Inox" variants when grinding "standard" steel.
I am curious about the very thin 0.6mm disks, but these cost over EUR 2 and they would have to be a hell of a lot better to justify that. They could be useful when heat input in the steel has to be limited. Thinner disks have to grind less material and therefore have a lower heat input. A possible problem with the very thin disks though is that they may be so thin there is just enough thickness for the reinforcement mesh and not enough for the grid itself.


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