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I'm going to guess your gong is 3/8" or 10mm thick?
Do you have a local scrap iron yard?
I have one close by and they will sell anything that comes in for how ever much they are currently getting for scrap (they'll buy from you for $.10 a lb and sell to you at $.15 a lb). I try to swing by at least once a week see some "drops" come in from the local interstate sign place all the time. These short lengths of tube where they square up the ends or cut to length but even better there are is also the cutouts where they make the bases for the signs that go at stores. The stores along the interstate have taller signs and thus thicker bases. I have a 1" thick x 12" square that I picked up there a few months ago. It's A36 material and I haven't had a chance to set it up to shoot it but I'm sure it will withstand anything I have in the safe.
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