Will putting a salted steak into a preheated stainless steel pan cause pitting?
I don't think so. The contact time is so short. These pans are meant to take a beating. They are very high quality SS. If it bothers you, get a cheap cast iron pan for this type of thing, it's what I do. You can read more here


  Pitting corrosion - The passive layer on stainless steel can be
  attacked by certain chemical species. The chloride ion Cl- is the most
  common of these and is found in everyday materials such as salt and
  bleach. Pitting corrosion is avoided by making sure that stainless
  steel does not come into prolonged contact with harmful chemicals or
  by choosing a grade of steel which is more resistant to attack. The
  pitting corrosion resistance can be assessed using the Pitting
  Resistance Equivalent Number calculated from the alloy content.