A cylindrical tank is required to contain a gage pressure 590 kPa. The tank is to be made of A516 grade 60 steel with a maximum allowable normal stress of 150 MPa. If the inner diameter of the tank is 2 m , what is the minimum thickness, t, of the wall?

Precipitation hardening can be achieved in many light alloys by a three-step heat treatment. what is carried out and what is the purpose at each step? why is such a treatment necessary based on the nucleation and growth theory of phase transformation. compare this treatment with tempering martensite for carbon steels (similarities and differences).