Melt blended HDPE compositions for single and dual wall corrugated HDPE pipe and associated fabricated and molded fittings and accessories having a density in the range of 0.951 to 0.954 grams per cubic centimeter, values of melt flow index according to ASTM D1238 in the range of about 0.15 to 0.35 with enhanced physical properties, process and environmental stress crack resistance (ESCR) characteristics and associated blend methods are disclosed in which virgin or recycled homopolymer and/or copolymer HDPE resin components are blended. The invention discloses a method selecting and determining the relative weight fractions of the HDPE blending components that provides specific physical properties and processability of HDPE blended compositions associated with density and melt index respectively and specific values of environmental stress crack resistance (ESCR) associated with specific molecular parameters. The principal benefits of this invention include cost reduction of raw materials to the corrugated HDPE pipe manufacturers by use of virgin prime commodity HDPE resins and/or wide and off specification prime HDPE resins in place of single stream specialty HDPE resins and favorable impact on the environment by providing the capability of utilizing billions of pounds of recycled HDPE resins in place of prime HDPE resins in the manufacture of corrugated HDPE pipe.