It is primarily intended for use in welded pressure vessels where notch toughness is important.These grades cover a range of tensile strengths from 55 - 90 MPa and this versatility explains much of the specifications popularity. For plates thinner than 40mm normally supply as rolled. Plates above 40mm thick are normalised. For A 516 grade 70, which is one of most popular steels, the ASME standard composition is as follows (dependent on grade).