TECH Hangars are a good counter to corvettes and intended so.
Unfortunately the info card is like statistics sometimes (damn and damn lies).
A TECH Hangar with the autocannon upgrade does 10 dps per bank (Front, Back, Left and Right). It can also engage 2 targets per bank. This does put the total potential damage at 80. The most single target damage though would be around 20 if positioned right.
Hangars also do ANTIVERYLIGHT damage so 2-4 hangars won't be killing many frigates or Capital ships.