Specifies chemical composition, room temperature, elevated temperature and low temperature properties, and tests for two types of hot-rolled silicon-aluminium fully killed carbon-manganese steel plate. Appendices give information to be supplied when ordering plate, creep rupture properties, LCL charts as the basis for verification procedures for elevated temperature properties, guidance on the influence of fabrication and heat treatment on mechanical properties, and permissible interchangeability of grades of Type 7 steel subject to Inspecting Authority approval.