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𝐏𝐎𝐖𝐄𝐑𝐒
𝐌𝐄𝐓𝐀-𝐇𝐔𝐌𝐀𝐍 𝐏𝐇𝐘𝐒𝐈𝐎𝐋𝐎𝐆𝐘: After Tony was struck by the energy of the Particle Accelerator explosion, this altered his DNA and supercharged his cells, augmenting his physiology into well-beyond peak human condition.
𝐌𝐄𝐓𝐀𝐋 𝐌𝐈𝐌𝐈𝐂𝐑𝐘: Tony had fallen into a vat of molten steel just prior to the S.T.A.R. Labs particle accelerator's explosion. Instead of dying, the antimatter, dark energy, and X-elements released during the accident caused Tony to gain superhuman powers. Tony could partially or completely transform his skin into a metallic substance, enhancing his physical parameters.
𝐒𝐔𝐏𝐄𝐑𝐇𝐔𝐌𝐀𝐍 𝐃𝐔𝐑𝐀𝐁𝐈𝐋𝐈𝐓𝐘: Tony's metallic skin could withstand extreme conditions. Bullets from handguns inflicted virtually no damage on him. The Flash had to impact him at Mach 1.1 (837 mph) before he could break through Tony's skin. Tony's skin also protected him from certain amounts electricity.
𝐒𝐔𝐏𝐄𝐑𝐇𝐔𝐌𝐀𝐍 𝐒𝐓𝐑𝐄𝐍𝐆𝐓𝐇: Even without transforming, Tony was stronger than the average human of his physical build and fitness, being capable of easily lifting heavy objects such as people and oil drums. By changing his arm/s to metal, Tony's strength was elevated enough to lift and overturn a car as well as deliver punches that could smash concrete. Once fully transformed, Tony was able to tip over a large metallic shelf stacked with weights ranging from 20 to 100+ lbs with one hand. Judging by when he encountered Iris West at CC Jitters and how she complimented his looks, Tony responded that he had been "working out", implying that he was getting stronger and not yet at his peak physical form.