The tutorial discusses the design of the beam cage of the working industrial site, crane beam, metal structures, tanks. Calculation and design of flooring, rolled and composite welded beams, centrally and off-centrally compressed columns, roof trusses from angle profiles, T-bars and I-beams, bent-welded and seamless hot-rolled pipes are described. Examples of calculation and design are given. The textbook is intended for students of secondary specialized educational institutions studying in construction specialties.