Just to clarify, you want to cut steel with a sliding compound miter saw, correct?
Yes, you will be able to find a abrasion blade that fits your saw.
Arbor sizes are pretty standardized. While your at it, you can also find an abrasion blade for you circ saw too....
However, YOU SHOULD NOT DO THIS. Two things: First, a proper metal chop saw has many
safety features to keep you from being hurt. It has a full shielding to protect you from sparks. That shielding will also protect you when (not if) the abrasion blade breaks apart at 4,000 RPM. Metal saws also have a clamp to keep the peice you are cutting from flying across the room. Second, a metal chop saw has one hell of a motor in it. It takes a lot more
power to cut steel then it does to cut wood. Remember, a wood chop saw removes material by scooping, an abrasion saw removes material by grinding. One way to thing of it is pretend you are trying to cut through a piece of wood only using sandpaper.
If you try this, odds are you will burn up your chop saw...
throw a piece of steel across the room and possibly hurt someone, and finally end up with abrasion saw shrapnel stuck in multiple body parts. Not something you really want to deal with.
Buy one of these and be done with it:
14 in. Cut-Off Saw D28715-D28715 at The Home Depot
Buying one of these would also do the trick... though a big slower but more exact: [URL='http://www.amazon.com/dp/B00004T9QI/ref=asc_df_B00004T9QI1918297?smid=ATVPDKIKX0DER&tag=hyprod-20&linkCode=asn&creative=395093&creativeASIN=B00004T9QI"]Milwaukee 6225 6 Amp / 5 Amp 2 Speed Portable Band Saw: Amazon.com: Home Improvement[/URL]
Finally, if you want the best metal cutting saw you can buy without buying a cold saw:
DW872 14" (355mm) Multi-Cutter Saw | DEWALT Tools
And just a side note, if you are starting to work with steel you can
build just about anything with the following: MIG welder, Carbide metal chop saw, angle grinder. The following also make life easier: stationary drill press, bench grinder, porta-band, stationary band saw, and a
torch set. Besides a few
hand tools, a large work table (6'x24' for starters) that is all I have ever had in any of my metal shops.