PRODUCTION OF PIPE CLAD STEEL

摘要

PURPOSE:To obtain the pipe clad steel of particularly superior rate of compression- bonding at both end parts by rolling the multilayer pipe comprising forming the groove and protrusion of the specific shapes to at least one end of carbon steel base material and bonding this and a clad steel such as of stainless steel, etc. CONSTITUTION:A groove 3 and protrusion S are formed to at least one end of a carbon steel (containing low carbon steel) base material 1 so that the depth d of the groove and the width l of the protrusion become d>=1/2t, l>=3/5t with respect to the plate thickness t of the clad steel 2. The multilayer pipe comprising firmly welding this and clad steel 2 such as of stainless steel, etc. is hot rolled. The welding length W of the base material 1 and clad steel 2 is made to about the thickness of the clad steel 2 and the bottom of the groove 3 is rounded so as not to become the point for initiation of rupture. The width l may be about 10mm. Thus, the long- length pipe form clad steel of superior compression-bonding power (particularly the compression-bonding power at the both end parts is high) is obtained.