The workers, Om Prakash (35) and Ram Swarup (25) were killed when the boiler exploded inside the unit of Kranti Steel Pvt Ltd in the Dargah Shareef police station area here, police said.
The injured were rushed to the district hospital from where one has been shifted to Lucknow.
Meanwhile, the District Magistrate Kinjal Singh has ordered a magisterial inquiry into the incident while the proprietors of the unit have handed over cheques of Rs 10 lakh each to the next to kin of the deceased.