Astra (company name, Unceta y Cia - ASTRA was the trademark) was a class act. They had no more or less trouble with improperly heat treated parts than any other maker.

Is the gun in question a box lock or side lock?

Astra made a very nice box lock, model name Imperial:





The Imperial was made in 10 gauge.

If the gun is a side lock, things get murky. Astra made no side lock shotguns. But they did retail side locks guns made by many other makers under the Astra trademark and Unceta name.