CAST IRON Russian patent published in 1997 - IPC

FIELD: ferrous metallurgy, in particular, compositions of deformable irons used in manufacture of pipes for oil pipelines by plastic hot and cold deformation. SUBSTANCE: cast iron contains, mas.%: carbon, 2.7-3.2; silicon, 1.0-2.5; nickel, 0.3-0.8; magnesium, 0,005-0.05; rare earth metals, 0.008-0.9; manganese, 0.05-0.14; aluminum, 0.005-0.02; calcium, 0.001-0.004; iron, the balance. EFFECT: higher quality and yield of pipes made from cast iron by plastic deformation of ingot; increased economic efficiency in manufacture of pipes of oil assortment by 75%. 2 tbl