Manufacture of Large Seamless Steel Tubes by the Tschulenk Forge-Rolling Process

In this paper the authors present a new technique for the manufacture of seamless steel tubes and other hollow steel bodies with diameters from 20 to 60 in. or even greater, lengths up to 60 ft., and wall thicknesses from approximately ⅝ in. up to almost any thickness that may be required. Except in very special instances such tubes or vessels would be completed from the original hollow steel block in a single pass without previous forging of the ingot and without the necessity of subsequent tooling. Both the design of the mill and the details of its operations are described, and in conclusion the authors deal briefly with the manufacturing economies which may reasonably be expected.