If it is of any help the composition for the steel, S275 (old grade 43) can be found in BS EN 10025 Hot Rolled Products of non alloy structural steels. This is a European Standard. There are however different types of S275 steel S275J0 S275J2 for example. They have different impact properties.
If you are looking at it from a design point of view, i.e bending, shear, tensile, compression in structural members you could look at BS 5950 Structural use of steelwork in building. This is a British Ultimate Limit State design code.