Is there a replacement in cast iron or stainless, for the discontinuedAmericastSilhouette 22" x 25" sink?

I recommend an Elkay stainless steel sink. The drain is not offset the way the Americast drain is, but that shouldn't be a problem. Celebrity is the name of their basic line but it is not a cheapo sink. It comes in depths of 7", 10", and 12". The 10" and 12" deep ones are special order. They also have the Pacemaker, and the Lustertone, which is their top line sink.
I don't care for cast iron sinks as they sometimes bleed rust through the caulk, get scratched, and quickly lose ther gloss.

Clips attach to rim and hold sink from below, and rim holds sink from above.
Remove clips and sink will drop down.
Then use putty knife to remove rim from countertop.
New sinks will probably not fit same opening, new sinks are slightly smaller, so measure before removing old sink.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

New sink,its 2011 and its done its service to its country.Nice Kohler cast iron drop in is the way to go.Most peoples issues with sinks are abrasive cleaners ,even softscrub,it takes the finish off of all types of plumbing fixtures,cast iron- fiberglass- stainless etc.I tell people not to use anything you wouldn't use on your car finish Elkay makes some nice stainless sinks.Top of the line,let jacuzzi stick to whirlpools

Possible you could use an epoxy or J B Weld to repair it. I have fixed a couple of gas tanks with JB weld it should work on Cast also . It not to expensive and may be a start for you.

if cast iron , rub with oil and if you have to, gently with steel wool, in circles

jb weld it

Yes all can be replaced. They sell complete replacments at Orchards, Home Depot or Lowes. Just make sure you are getting the right parts.

Turn the water supplies off unscrew the hoses,get a flashlight and look under the sink you should see clamps around the top holding it in, unscrew these and pull the sink out.
Len

Sinks are made of many different materials. These include Stainless steel, Enamel over steel or cast iron, Ceramic, Plastic, Soapstone, Concrete, Terrazzo, Totianota, Wood, Stone, Copper and Glass.

There are aftermarket cast iron burners available for approx $64.95. Otherwise, the OEM burner is a Dynachrome which is a chrome plated cast iron that is almost $300. I do not believe that the cast stainless is still available.